Multiselect • Angular

Genel Bakış

Çoklu seçim kalıbı, klavye navigasyonu ve ekran okuyucu desteğine sahip son derece erişilebilir çoklu seçimli açılır menüler oluşturmak için salt okunur bir combobox tetikleyicisini çoklu seçimli bir listbox açılır penceresiyle birleştirir.

app.ts

import {Combobox, ComboboxPopup, ComboboxWidget} from '@angular/aria/combobox';
import {Listbox, Option} from '@angular/aria/listbox';
import {OverlayModule} from '@angular/cdk/overlay';
import {afterRenderEffect, Component, computed, signal, viewChild, effect} from '@angular/core';

@Component({
  selector: 'app-root:not([theme="icons-basic"])',
  templateUrl: './app.html',
  styleUrl: './app.css',
  imports: [Combobox, ComboboxPopup, ComboboxWidget, Listbox, Option, OverlayModule],
})
export class App {
  /** The combobox listbox popup. */
  readonly listbox = viewChild(Listbox);

  /** The options available in the listbox. */
  readonly selectedValues = signal<string[]>([]);

  /** The icon that is displayed in the combobox. */
  readonly displayIcon = computed(() => {
    const values = this.selectedValues();
    const label = this.labels.find((label) => label.value === values[0]);
    return label ? label.icon : '';
  });

  /** The string that is displayed in the combobox. */
  readonly displayValue = computed(() => {
    const values = this.selectedValues();
    if (values.length === 0) {
      return 'Select a label';
    }
    if (values.length === 1) {
      return values[0];
    }
    return `${values[0]} + ${values.length - 1} more`;
  });

  /** The labels that are available for selection. */
  readonly labels = [
    {value: 'Important', icon: 'label'},
    {value: 'Starred', icon: 'star'},
    {value: 'Work', icon: 'work'},
    {value: 'Personal', icon: 'person'},
    {value: 'To Do', icon: 'checklist'},
    {value: 'Later', icon: 'schedule'},
    {value: 'Read', icon: 'menu_book'},
    {value: 'Travel', icon: 'flight'},
  ];

  /** Whether the popup is expanded. */
  readonly popupExpanded = signal(false);

  constructor() {
    // Scrolls to the active item when the active option changes.
    afterRenderEffect(() => {
      this.listbox()?.scrollActiveItemIntoView();
    });
  }
}

app.html

<div
  #combobox="ngCombobox"
  ngCombobox
  [(expanded)]="popupExpanded"
  [preserveContent]="true"
  class="select"
>
  <span class="combobox-label">
    <span class="selected-label-icon material-symbols-outlined" translate="no" aria-hidden="true">{{
      displayIcon()
    }}</span>
    <span class="selected-label-text">{{ displayValue() }}</span>
  </span>
  <span class="example-arrow material-symbols-outlined" translate="no" aria-hidden="true"
    >arrow_drop_down</span
  >
</div>

<ng-template
  [cdkConnectedOverlay]="{origin: combobox.element, usePopover: 'inline', matchWidth: true}"
  [cdkConnectedOverlayOpen]="popupExpanded()"
>
  <ng-template ngComboboxPopup [combobox]="combobox">
    <div class="example-popup-container">
      <div
        #listbox="ngListbox"
        ngListbox
        [multi]="true"
        ngComboboxWidget
        focusMode="activedescendant"
        [tabindex]="-1"
        selectionMode="explicit"
        [(value)]="selectedValues"
        [activeDescendant]="listbox.activeDescendant()"
      >
        @for (label of labels; track label.value) {
          <div ngOption [value]="label.value" [label]="label.value">
            <span
              class="example-option-icon material-symbols-outlined"
              translate="no"
              aria-hidden="true"
              >{{ label.icon }}</span
            >
            <span class="example-option-text">{{ label.value }}</span>
            <span
              class="example-option-check material-symbols-outlined"
              translate="no"
              aria-hidden="true"
              >check</span
            >
          </div>
        }
      </div>
    </div>
  </ng-template>
</ng-template>

app.css

@import url('https://fonts.googleapis.com/icon?family=Material+Symbols+Outlined');

:host {
  display: flex;
  justify-content: center;
  font-family: var(--inter-font);
}

.select {
  display: flex;
  position: relative;
  align-items: center;
  color: color-mix(in srgb, var(--hot-pink) 90%, var(--primary-contrast));
  background-color: color-mix(in srgb, var(--hot-pink) 5%, transparent);
  border-radius: 0.5rem;
  border: 1px solid color-mix(in srgb, var(--hot-pink) 80%, transparent);
  /* Modernized additions for div-trigger Select: */
  height: 2.5rem;
  padding: 0 3.5rem;
  cursor: pointer;
  box-sizing: border-box;
  width: 16rem;
  user-select: none;
  -webkit-user-select: none;
  outline: none;
}

.select span {
  user-select: none;
  -webkit-user-select: none;
}

.select:hover {
  background-color: color-mix(in srgb, var(--hot-pink) 15%, transparent);
}

.select[aria-disabled='true'] {
  opacity: 0.6;
  cursor: default;
}

.selected-label-icon {
  font-size: 1.25rem;
}

.select:focus,
.select:focus-within {
  outline: 2px solid color-mix(in srgb, var(--hot-pink) 50%, transparent);
}

.combobox-label {
  gap: 1rem;
  left: 1rem;
  display: flex;
  position: absolute;
  align-items: center;
  pointer-events: none;
}

.example-arrow {
  right: 1rem;
  position: absolute;
  pointer-events: none;
  transition: transform 150ms ease-in-out;
}

.select[aria-expanded='true'] .example-arrow {
  transform: rotate(180deg);
}

.example-popup-container {
  width: 100%;
  padding: 0.5rem;
  margin-top: 8px;
  border-radius: 0.5rem;
  background-color: var(--septenary-contrast);
  font-size: 0.9rem;
  max-height: 11rem;
  box-sizing: border-box;
  overflow: hidden;
  animation: smoothPopupOpen 150ms ease-out forwards;
  transform-origin: top;
}

@keyframes smoothPopupOpen {
  0% {
    max-height: 0;
    opacity: 0;
  }
  16.7% {
    opacity: 1;
  }
  100% {
    max-height: 11rem;
    opacity: 1;
  }
}

.example-popup-container.closing {
  animation: smoothPopupClose 150ms ease-in forwards;
}

@keyframes smoothPopupClose {
  0% {
    max-height: 11rem;
    opacity: 1;
  }
  100% {
    max-height: 0;
    opacity: 0;
  }
}

[ngListbox] {
  gap: 2px;
  height: 100%;
  display: flex;
  overflow: auto;
  flex-direction: column;
  outline: none;
}

[ngOption] {
  display: flex;
  cursor: pointer;
  align-items: center;
  margin: 1px;
  padding: 0 1rem;
  min-height: 2.25rem;
  border-radius: 0.5rem;
  outline: none;
}

[ngOption]:hover {
  background-color: color-mix(in srgb, var(--primary-contrast) 5%, transparent);
}

[ngOption][data-active='true'] {
  outline-offset: -2px;
  outline: 2px solid color-mix(in srgb, var(--hot-pink) 50%, transparent);
}

[ngOption][aria-selected='true'] {
  color: var(--hot-pink);
  background-color: color-mix(in srgb, var(--hot-pink) 5%, transparent);
}

.example-option-icon {
  font-size: 1.25rem;
  padding-right: 1rem;
}

[ngOption]:not([aria-selected='true']) .example-option-check {
  display: none;
}

.example-option-icon,
.example-option-check {
  font-size: 0.9rem;
}

.example-option-text {
  flex: 1;
}

app.ts

import {Combobox, ComboboxPopup, ComboboxWidget} from '@angular/aria/combobox';
import {Listbox, Option} from '@angular/aria/listbox';
import {OverlayModule} from '@angular/cdk/overlay';
import {afterRenderEffect, Component, computed, signal, viewChild, effect} from '@angular/core';

@Component({
  selector: 'app-root:not([theme="icons-material"])',
  templateUrl: './app.html',
  styleUrl: './app.css',
  imports: [Combobox, ComboboxPopup, ComboboxWidget, Listbox, Option, OverlayModule],
})
export class App {
  /** The combobox listbox popup. */
  readonly listbox = viewChild(Listbox);

  /** The options available in the listbox. */
  readonly selectedValues = signal<string[]>([]);

  /** The icon that is displayed in the combobox. */
  readonly displayIcon = computed(() => {
    const values = this.selectedValues();
    const label = this.labels.find((label) => label.value === values[0]);
    return label ? label.icon : '';
  });

  /** The string that is displayed in the combobox. */
  readonly displayValue = computed(() => {
    const values = this.selectedValues();
    if (values.length === 0) {
      return 'Select a label';
    }
    if (values.length === 1) {
      return values[0];
    }
    return `${values[0]} + ${values.length - 1} more`;
  });

  /** The labels that are available for selection. */
  readonly labels = [
    {value: 'Important', icon: 'label'},
    {value: 'Starred', icon: 'star'},
    {value: 'Work', icon: 'work'},
    {value: 'Personal', icon: 'person'},
    {value: 'To Do', icon: 'checklist'},
    {value: 'Later', icon: 'schedule'},
    {value: 'Read', icon: 'menu_book'},
    {value: 'Travel', icon: 'flight'},
  ];

  /** Whether the popup is expanded. */
  readonly popupExpanded = signal(false);

  constructor() {
    // Scrolls to the active item when the active option changes.
    afterRenderEffect(() => {
      this.listbox()?.scrollActiveItemIntoView();
    });
  }
}

app.html

<div
  #combobox="ngCombobox"
  ngCombobox
  [(expanded)]="popupExpanded"
  [preserveContent]="true"
  class="select"
>
  <span class="combobox-label">
    <span class="selected-label-icon material-symbols-outlined" translate="no" aria-hidden="true">{{
      displayIcon()
    }}</span>
    <span class="selected-label-text">{{ displayValue() }}</span>
  </span>
  <span class="example-arrow material-symbols-outlined" translate="no" aria-hidden="true"
    >arrow_drop_down</span
  >
</div>

<ng-template
  [cdkConnectedOverlay]="{origin: combobox.element, usePopover: 'inline', matchWidth: true}"
  [cdkConnectedOverlayOpen]="popupExpanded()"
>
  <ng-template ngComboboxPopup [combobox]="combobox">
    <div class="example-popup-container">
      <div
        #listbox="ngListbox"
        ngListbox
        [multi]="true"
        ngComboboxWidget
        focusMode="activedescendant"
        [tabindex]="-1"
        selectionMode="explicit"
        [(value)]="selectedValues"
        [activeDescendant]="listbox.activeDescendant()"
      >
        @for (label of labels; track label.value) {
          <div ngOption [value]="label.value" [label]="label.value">
            <span
              class="example-option-icon material-symbols-outlined"
              translate="no"
              aria-hidden="true"
              >{{ label.icon }}</span
            >
            <span class="example-option-text">{{ label.value }}</span>
            <span
              class="example-option-check material-symbols-outlined"
              translate="no"
              aria-hidden="true"
              >check</span
            >
          </div>
        }
      </div>
    </div>
  </ng-template>
</ng-template>

app.css

@import url('https://fonts.googleapis.com/icon?family=Material+Symbols+Outlined');

:host {
  display: flex;
  justify-content: center;
  font-family: var(--inter-font);
  --primary: var(--hot-pink);
  --on-primary: var(--page-background);
}

.docs-light-mode {
  --on-primary: #fff;
}

.select {
  display: flex;
  position: relative;
  align-items: center;
  border-radius: 3rem;
  color: var(--on-primary);
  background-color: var(--primary);
  border: 1px solid color-mix(in srgb, var(--primary) 80%, transparent);
  /* Modernized additions for div-trigger Select: */
  height: 3rem;
  padding: 0 3.5rem;
  cursor: pointer;
  box-sizing: border-box;
  width: 16rem;
  user-select: none;
  -webkit-user-select: none;
  outline: none;
}

.select span {
  user-select: none;
  -webkit-user-select: none;
}

.select:hover {
  background-color: color-mix(in srgb, var(--primary) 90%, transparent);
}

.select[aria-disabled='true'] {
  opacity: 0.6;
  cursor: default;
}

.selected-label-icon {
  font-size: 1.25rem;
}

.select:focus,
.select:focus-within {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

.combobox-label {
  gap: 1rem;
  left: 1rem;
  display: flex;
  position: absolute;
  align-items: center;
  pointer-events: none;
}

.example-arrow {
  right: 1rem;
  position: absolute;
  pointer-events: none;
  transition: transform 150ms ease-in-out;
}

.select[aria-expanded='true'] .example-arrow {
  transform: rotate(180deg);
}

.example-popup-container {
  width: 100%;
  padding: 0.5rem;
  margin-top: 8px;
  border-radius: 2rem;
  background-color: var(--septenary-contrast);
  font-size: 0.9rem;
  max-height: 13rem;
  box-sizing: border-box;
  overflow: hidden;
  animation: smoothPopupOpen 150ms ease-out forwards;
  transform-origin: top;
}

@keyframes smoothPopupOpen {
  0% {
    max-height: 0;
    opacity: 0;
  }
  16.7% {
    opacity: 1;
  }
  100% {
    max-height: 13rem;
    opacity: 1;
  }
}

.example-popup-container.closing {
  animation: smoothPopupClose 150ms ease-in forwards;
}

@keyframes smoothPopupClose {
  0% {
    max-height: 13rem;
    opacity: 1;
  }
  100% {
    max-height: 0;
    opacity: 0;
  }
}

[ngListbox] {
  gap: 2px;
  padding: 2px;
  height: 100%;
  display: flex;
  overflow: auto;
  flex-direction: column;
  outline: none;
}

[ngOption] {
  display: flex;
  cursor: pointer;
  align-items: center;
  padding: 0 1rem;
  min-height: 3rem;
  border-radius: 3rem;
  outline: none;
}

[ngOption]:hover,
[ngOption][data-active='true'] {
  background-color: color-mix(in srgb, var(--primary-contrast) 5%, transparent);
}

[ngOption][data-active='true'] {
  outline-offset: -2px;
  outline: 2px solid var(--primary);
}

[ngOption][aria-selected='true'] {
  color: var(--primary);
  background-color: color-mix(in srgb, var(--primary) 10%, transparent);
}

.example-option-icon {
  font-size: 1.25rem;
  padding-right: 1rem;
}

[ngOption]:not([aria-selected='true']) .example-option-check {
  display: none;
}

.example-option-icon,
.example-option-check {
  font-size: 0.9rem;
}

.example-option-text {
  flex: 1;
}

app.ts

import {Combobox, ComboboxPopup, ComboboxWidget} from '@angular/aria/combobox';
import {Listbox, Option} from '@angular/aria/listbox';
import {OverlayModule} from '@angular/cdk/overlay';
import {afterRenderEffect, Component, computed, signal, viewChild, effect} from '@angular/core';

@Component({
  selector: 'app-root:not([theme="icons-retro"])',
  templateUrl: './app.html',
  styleUrl: './app.css',
  imports: [Combobox, ComboboxPopup, ComboboxWidget, Listbox, Option, OverlayModule],
})
export class App {
  /** The combobox listbox popup. */
  readonly listbox = viewChild(Listbox);

  /** The options available in the listbox. */
  readonly selectedValues = signal<string[]>([]);

  /** The icon that is displayed in the combobox. */
  readonly displayIcon = computed(() => {
    const values = this.selectedValues();
    const label = this.labels.find((label) => label.value === values[0]);
    return label ? label.icon : '';
  });

  /** The string that is displayed in the combobox. */
  readonly displayValue = computed(() => {
    const values = this.selectedValues();
    if (values.length === 0) {
      return 'Select a label';
    }
    if (values.length === 1) {
      return values[0];
    }
    return `${values[0]} + ${values.length - 1} more`;
  });

  /** The labels that are available for selection. */
  readonly labels = [
    {value: 'Important', icon: 'label'},
    {value: 'Starred', icon: 'star'},
    {value: 'Work', icon: 'work'},
    {value: 'Personal', icon: 'person'},
    {value: 'To Do', icon: 'checklist'},
    {value: 'Later', icon: 'schedule'},
    {value: 'Read', icon: 'menu_book'},
    {value: 'Travel', icon: 'flight'},
  ];

  /** Whether the popup is expanded. */
  readonly popupExpanded = signal(false);

  constructor() {
    // Scrolls to the active item when the active option changes.
    afterRenderEffect(() => {
      this.listbox()?.scrollActiveItemIntoView();
    });
  }
}

app.html

<div
  #combobox="ngCombobox"
  ngCombobox
  [(expanded)]="popupExpanded"
  [preserveContent]="true"
  class="select"
>
  <span class="combobox-label">
    <span class="selected-label-icon material-symbols-outlined" translate="no" aria-hidden="true">{{
      displayIcon()
    }}</span>
    <span class="selected-label-text">{{ displayValue() }}</span>
  </span>
  <span class="example-arrow material-symbols-outlined" translate="no" aria-hidden="true"
    >arrow_drop_down</span
  >
</div>

<ng-template
  [cdkConnectedOverlay]="{origin: combobox.element, usePopover: 'inline', matchWidth: true}"
  [cdkConnectedOverlayOpen]="popupExpanded()"
>
  <ng-template ngComboboxPopup [combobox]="combobox">
    <div class="example-popup-container">
      <div
        #listbox="ngListbox"
        ngListbox
        [multi]="true"
        ngComboboxWidget
        focusMode="activedescendant"
        [tabindex]="-1"
        selectionMode="explicit"
        [(value)]="selectedValues"
        [activeDescendant]="listbox.activeDescendant()"
      >
        @for (label of labels; track label.value) {
          <div ngOption [value]="label.value" [label]="label.value">
            <span
              class="example-option-icon material-symbols-outlined"
              translate="no"
              aria-hidden="true"
              >{{ label.icon }}</span
            >
            <span class="example-option-text">{{ label.value }}</span>
            <span
              class="example-option-check material-symbols-outlined"
              translate="no"
              aria-hidden="true"
              >check</span
            >
          </div>
        }
      </div>
    </div>
  </ng-template>
</ng-template>

app.css

@import url('https://fonts.googleapis.com/icon?family=Material+Symbols+Outlined');
@import url('https://fonts.googleapis.com/css2?family=Press+Start+2P&display=swap');

:host {
  display: flex;
  justify-content: center;
  font-size: 0.8rem;

  font-family: 'Press Start 2P';
  --retro-button-color: color-mix(in srgb, var(--hot-pink) 80%, var(--page-background));
  --retro-shadow-light: color-mix(in srgb, var(--retro-button-color) 90%, #fff);
  --retro-shadow-dark: color-mix(in srgb, var(--retro-button-color) 90%, #000);
  --retro-elevated-shadow:
    inset 4px 4px 0px 0px var(--retro-shadow-light),
    inset -4px -4px 0px 0px var(--retro-shadow-dark), 4px 0px 0px 0px var(--tertiary-contrast),
    0px 4px 0px 0px var(--tertiary-contrast), -4px 0px 0px 0px var(--tertiary-contrast),
    0px -4px 0px 0px var(--tertiary-contrast);
  --retro-flat-shadow:
    4px 0px 0px 0px var(--tertiary-contrast), 0px 4px 0px 0px var(--tertiary-contrast),
    -4px 0px 0px 0px var(--tertiary-contrast), 0px -4px 0px 0px var(--tertiary-contrast);
  --retro-clickable-shadow:
    inset 4px 4px 0px 0px var(--retro-shadow-light),
    inset -4px -4px 0px 0px var(--retro-shadow-dark), 4px 0px 0px 0px var(--tertiary-contrast),
    0px 4px 0px 0px var(--tertiary-contrast), -4px 0px 0px 0px var(--tertiary-contrast),
    0px -4px 0px 0px var(--tertiary-contrast), 8px 8px 0px 0px var(--tertiary-contrast);
  --retro-pressed-shadow:
    inset 4px 4px 0px 0px var(--retro-shadow-dark),
    inset -4px -4px 0px 0px var(--retro-shadow-light), 4px 0px 0px 0px var(--tertiary-contrast),
    0px 4px 0px 0px var(--tertiary-contrast), -4px 0px 0px 0px var(--tertiary-contrast),
    0px -4px 0px 0px var(--tertiary-contrast), 0px 0px 0px 0px var(--tertiary-contrast);
}

.select {
  display: flex;
  position: relative;
  align-items: center;
  color: var(--page-background);
  background-color: var(--hot-pink);
  box-shadow: var(--retro-clickable-shadow);
  /* Modernized additions for div-trigger Select: */
  height: 2.5rem;
  padding: 0 4.5rem;
  cursor: pointer;
  box-sizing: border-box;
  width: 22rem;
  user-select: none;
  -webkit-user-select: none;
  outline: none;
}

.select span {
  user-select: none;
  -webkit-user-select: none;
}

.select:hover,
.select:focus,
.select:focus-within {
  transform: translate(1px, 1px);
}

.select:active {
  transform: translate(4px, 4px);
  box-shadow: var(--retro-pressed-shadow);
  background-color: color-mix(in srgb, var(--retro-button-color) 60%, var(--gray-50));
}

.select[aria-disabled='true'] {
  opacity: 0.6;
  cursor: default;
}

.selected-label-icon {
  font-size: 1.25rem;
}

.select[aria-expanded='false']:focus,
.select[aria-expanded='false']:focus-within {
  outline-offset: 8px;
  outline: 4px dashed var(--hot-pink);
}

.combobox-label {
  gap: 1rem;
  left: 1rem;
  display: flex;
  position: absolute;
  align-items: center;
  pointer-events: none;
}

.example-arrow {
  right: 1rem;
  position: absolute;
  pointer-events: none;
  transition: transform 150ms ease-in-out;
}

.select[aria-expanded='true'] .example-arrow {
  transform: rotate(180deg);
}

.example-popup-container {
  width: 100%;
  padding: 0.5rem;
  margin-top: 20px;
  box-shadow: var(--retro-flat-shadow);
  background-color: var(--septenary-contrast);
  max-height: 11rem;
  box-sizing: border-box;
  overflow: hidden;
  animation: smoothPopupOpen 150ms ease-out forwards;
  transform-origin: top;
}

@keyframes smoothPopupOpen {
  0% {
    max-height: 0;
    opacity: 0;
  }
  16.7% {
    opacity: 1;
  }
  100% {
    max-height: 11rem;
    opacity: 1;
  }
}

.example-popup-container.closing {
  animation: smoothPopupClose 150ms ease-in forwards;
}

@keyframes smoothPopupClose {
  0% {
    max-height: 11rem;
    opacity: 1;
  }
  100% {
    max-height: 0;
    opacity: 0;
  }
}

[ngListbox] {
  gap: 2px;
  height: 100%;
  display: flex;
  overflow: auto;
  flex-direction: column;
  outline: none;
}

[ngOption] {
  display: flex;
  cursor: pointer;
  align-items: center;
  padding: 0 1rem;
  font-size: 0.6rem;
  min-height: 2.25rem;
  outline: none;
}

[ngOption]:hover {
  background-color: color-mix(in srgb, var(--primary-contrast) 5%, transparent);
}

[ngOption][data-active='true'] {
  outline-offset: -2px;
  outline: 2px dashed var(--hot-pink);
}

[ngOption][aria-selected='true'] {
  color: var(--hot-pink);
  background-color: color-mix(in srgb, var(--hot-pink) 5%, transparent);
}

.example-option-icon {
  font-size: 1.25rem;
  padding-right: 1rem;
}

[ngOption]:not([aria-selected='true']) .example-option-check {
  display: none;
}

.example-option-icon,
.example-option-check {
  font-size: 0.9rem;
}

.example-option-text {
  flex: 1;
}

Kullanım

Çoklu seçim kalıbı, kullanıcıların bilinen bir seçenek kümesinden birden fazla ilişkili öğe seçmesi gerektiğinde en iyi çalışır.

Şu durumlarda bu kalıbı kullanmayı düşünün:

Kullanıcıların birden fazla seçime ihtiyacı var - Birden fazla seçimin geçerli olduğu etiketler, kategoriler, filtreler veya etiketler
Seçenek listesi sabit (20'den az öğe) - Kullanıcılar arama yapmadan seçenekleri tarayabilir
İçerik filtreleme - Aynı anda birden fazla kriter aktif olabilir
Özellik atama - Birden fazla değerin anlamlı olduğu etiketler, izinler veya özellikler
İlişkili seçimler - Mantıksal olarak birlikte çalışan seçenekler (birden fazla takım üyesi seçmek gibi)

Şu durumlarda bu kalıptan kaçının:

Yalnızca tek seçim gerekli - Daha basit tek seçimli açılır menüler için Select kalıbını kullanın
Liste 20'den fazla öğe ve arama gerekli - Çoklu seçim yeteneğine sahip Autocomplete kalıbını kullanın
Çoğu veya tüm seçenekler seçilecek - Bir kontrol listesi kalıbı daha iyi görünürlük sağlar
Seçimler bağımsız ikili seçenekler - Bireysel onay kutuları seçimleri daha açık iletir

Özellikler

Çoklu seçim kalıbı, tam erişilebilir bir açılır menü sağlamak için Combobox ve Listbox yönergelerini birleştirir:

Klavye Navigasyonu - Ok tuşlarıyla seçenekler arasında gezinin, Boşluk ile değiştirin, Escape ile kapatın
Ekran Okuyucu Desteği - aria-multiselectable dahil yerleşik ARIA nitelikleri
Seçim Sayısı Görünümü - Birden fazla seçim için kompakt "Öğe + 2 daha" kalıbı gösterir
Sinyal Tabanlı Reaktivite - Angular sinyalleri kullanan reaktif durum yönetimi
Akıllı Konumlandırma - CDK Overlay görünüm alanı kenarlarını ve kaydırmayı yönetir
Kalıcı Seçim - Seçili seçenekler, seçimden sonra onay işaretleriyle görünür kalır

Örnekler

Temel çoklu seçim

Kullanıcıların bir seçenek listesinden birden fazla öğe seçmesi gerekir. Salt okunur combobox, çoklu etkin listbox ile eşleştirildiğinde, tam erişilebilirlik desteği ile tanıdık çoklu seçim işlevi sağlar.

app.ts

import {Combobox, ComboboxPopup, ComboboxWidget} from '@angular/aria/combobox';
import {Listbox, Option} from '@angular/aria/listbox';
import {OverlayModule} from '@angular/cdk/overlay';
import {afterRenderEffect, Component, computed, signal, viewChild, effect} from '@angular/core';

@Component({
  selector: 'app-root',
  templateUrl: './app.html',
  styleUrl: './app.css',
  imports: [Combobox, ComboboxPopup, ComboboxWidget, Listbox, Option, OverlayModule],
})
export class App {
  /** The combobox listbox popup. */
  readonly listbox = viewChild(Listbox);

  /** The options available in the listbox. */
  readonly selectedValues = signal<string[]>([]);

  /** The string that is displayed in the combobox. */
  readonly displayValue = computed(() => {
    const values = this.selectedValues();
    if (values.length === 0) {
      return 'Select a label';
    }
    if (values.length === 1) {
      return values[0];
    }
    return `${values[0]} + ${values.length - 1} more`;
  });

  /** The labels that are available for selection. */
  readonly labels = [
    {value: 'Important', icon: 'label'},
    {value: 'Starred', icon: 'star'},
    {value: 'Work', icon: 'work'},
    {value: 'Personal', icon: 'person'},
    {value: 'To Do', icon: 'checklist'},
    {value: 'Later', icon: 'schedule'},
    {value: 'Read', icon: 'menu_book'},
    {value: 'Travel', icon: 'flight'},
  ];

  /** Whether the popup is expanded. */
  readonly popupExpanded = signal(false);

  constructor() {
    // Scrolls to the active item when the active option changes.
    afterRenderEffect(() => {
      this.listbox()?.scrollActiveItemIntoView();
    });
  }
}

app.html

<div
  #combobox="ngCombobox"
  ngCombobox
  [(expanded)]="popupExpanded"
  [preserveContent]="true"
  class="select"
>
  <span class="combobox-label">
    <span class="selected-label-text">{{ displayValue() }}</span>
  </span>
  <span class="example-arrow material-symbols-outlined" translate="no" aria-hidden="true"
    >arrow_drop_down</span
  >
</div>

<ng-template
  [cdkConnectedOverlay]="{origin: combobox.element, usePopover: 'inline', matchWidth: true}"
  [cdkConnectedOverlayOpen]="popupExpanded()"
>
  <ng-template ngComboboxPopup [combobox]="combobox">
    <div class="example-popup-container">
      <div
        #listbox="ngListbox"
        ngListbox
        [multi]="true"
        ngComboboxWidget
        focusMode="activedescendant"
        [tabindex]="-1"
        selectionMode="explicit"
        [(value)]="selectedValues"
        [activeDescendant]="listbox.activeDescendant()"
      >
        @for (label of labels; track label.value) {
          <div ngOption [value]="label.value" [label]="label.value">
            <span
              class="example-option-icon material-symbols-outlined"
              translate="no"
              aria-hidden="true"
              >{{ label.icon }}</span
            >
            <span class="example-option-text">{{ label.value }}</span>
            <span
              class="example-option-check material-symbols-outlined"
              translate="no"
              aria-hidden="true"
              >check</span
            >
          </div>
        }
      </div>
    </div>
  </ng-template>
</ng-template>

app.css

@import url('https://fonts.googleapis.com/icon?family=Material+Symbols+Outlined');

:host {
  display: flex;
  justify-content: center;
  font-family: var(--inter-font);
}

.select {
  display: flex;
  position: relative;
  align-items: center;
  color: color-mix(in srgb, var(--hot-pink) 90%, var(--primary-contrast));
  background-color: color-mix(in srgb, var(--hot-pink) 5%, transparent);
  border-radius: 0.5rem;
  border: 1px solid color-mix(in srgb, var(--hot-pink) 80%, transparent);
  /* Modernized additions for div-trigger Select: */
  height: 2.5rem;
  padding: 0 2.5rem;
  cursor: pointer;
  box-sizing: border-box;
  width: 16rem;
  user-select: none;
  -webkit-user-select: none;
  outline: none;
}

.select span {
  user-select: none;
  -webkit-user-select: none;
}

.select:hover {
  background-color: color-mix(in srgb, var(--hot-pink) 15%, transparent);
}

.select[aria-disabled='true'] {
  opacity: 0.6;
  cursor: default;
}

.select:focus,
.select:focus-within {
  outline: 2px solid color-mix(in srgb, var(--hot-pink) 50%, transparent);
}

.combobox-label {
  gap: 1rem;
  left: 1.5rem;
  display: flex;
  position: absolute;
  align-items: center;
  pointer-events: none;
}

.example-arrow {
  right: 1rem;
  position: absolute;
  pointer-events: none;
  transition: transform 150ms ease-in-out;
}

.select[aria-expanded='true'] .example-arrow {
  transform: rotate(180deg);
}

.example-popup-container {
  width: 100%;
  padding: 0.5rem;
  margin-top: 8px;
  border-radius: 0.5rem;
  background-color: var(--septenary-contrast);
  font-size: 0.9rem;
  max-height: 11rem;
  box-sizing: border-box;
  overflow: hidden;
  animation: smoothPopupOpen 150ms ease-out forwards;
  transform-origin: top;
}

@keyframes smoothPopupOpen {
  0% {
    max-height: 0;
    opacity: 0;
  }
  16.7% {
    opacity: 1;
  }
  100% {
    max-height: 11rem;
    opacity: 1;
  }
}

.example-popup-container.closing {
  animation: smoothPopupClose 150ms ease-in forwards;
}

@keyframes smoothPopupClose {
  0% {
    max-height: 11rem;
    opacity: 1;
  }
  100% {
    max-height: 0;
    opacity: 0;
  }
}

[ngListbox] {
  gap: 2px;
  height: 100%;
  display: flex;
  overflow: auto;
  flex-direction: column;
  outline: none;
}

[ngOption] {
  display: flex;
  cursor: pointer;
  align-items: center;
  margin: 1px;
  padding: 0 1rem;
  min-height: 2.25rem;
  border-radius: 0.5rem;
  outline: none;
}

[ngOption]:hover {
  background-color: color-mix(in srgb, var(--primary-contrast) 5%, transparent);
}

[ngOption][data-active='true'] {
  outline-offset: -2px;
  outline: 2px solid color-mix(in srgb, var(--hot-pink) 50%, transparent);
}

[ngOption][aria-selected='true'] {
  color: var(--hot-pink);
  background-color: color-mix(in srgb, var(--hot-pink) 5%, transparent);
}

.example-option-icon {
  font-size: 1.25rem;
  padding-right: 1rem;
}

[ngOption]:not([aria-selected='true']) .example-option-check {
  display: none;
}

.example-option-icon,
.example-option-check {
  font-size: 0.9rem;
}

.example-option-text {
  flex: 1;
}

app.ts

import {Combobox, ComboboxPopup, ComboboxWidget} from '@angular/aria/combobox';
import {Listbox, Option} from '@angular/aria/listbox';
import {OverlayModule} from '@angular/cdk/overlay';
import {afterRenderEffect, Component, computed, signal, viewChild, effect} from '@angular/core';

@Component({
  selector: 'app-root:not([theme="basic-material"])',
  templateUrl: './app.html',
  styleUrl: './app.css',
  imports: [Combobox, ComboboxPopup, ComboboxWidget, Listbox, Option, OverlayModule],
})
export class App {
  /** The combobox listbox popup. */
  readonly listbox = viewChild(Listbox);

  /** The options available in the listbox. */
  readonly selectedValues = signal<string[]>([]);

  /** The string that is displayed in the combobox. */
  readonly displayValue = computed(() => {
    const values = this.selectedValues();
    if (values.length === 0) {
      return 'Select a label';
    }
    if (values.length === 1) {
      return values[0];
    }
    return `${values[0]} + ${values.length - 1} more`;
  });

  /** The labels that are available for selection. */
  readonly labels = [
    {value: 'Important', icon: 'label'},
    {value: 'Starred', icon: 'star'},
    {value: 'Work', icon: 'work'},
    {value: 'Personal', icon: 'person'},
    {value: 'To Do', icon: 'checklist'},
    {value: 'Later', icon: 'schedule'},
    {value: 'Read', icon: 'menu_book'},
    {value: 'Travel', icon: 'flight'},
  ];

  /** Whether the popup is expanded. */
  readonly popupExpanded = signal(false);

  constructor() {
    // Scrolls to the active item when the active option changes.
    afterRenderEffect(() => {
      this.listbox()?.scrollActiveItemIntoView();
    });
  }
}

app.html

<div
  #combobox="ngCombobox"
  ngCombobox
  [(expanded)]="popupExpanded"
  [preserveContent]="true"
  class="select"
>
  <span class="combobox-label">
    <span class="selected-label-text">{{ displayValue() }}</span>
  </span>
  <span class="example-arrow material-symbols-outlined" translate="no" aria-hidden="true"
    >arrow_drop_down</span
  >
</div>

<ng-template
  [cdkConnectedOverlay]="{origin: combobox.element, usePopover: 'inline', matchWidth: true}"
  [cdkConnectedOverlayOpen]="popupExpanded()"
>
  <ng-template ngComboboxPopup [combobox]="combobox">
    <div class="example-popup-container">
      <div
        #listbox="ngListbox"
        ngListbox
        [multi]="true"
        ngComboboxWidget
        focusMode="activedescendant"
        [tabindex]="-1"
        selectionMode="explicit"
        [(value)]="selectedValues"
        [activeDescendant]="listbox.activeDescendant()"
      >
        @for (label of labels; track label.value) {
          <div ngOption [value]="label.value" [label]="label.value">
            <span
              class="example-option-icon material-symbols-outlined"
              translate="no"
              aria-hidden="true"
              >{{ label.icon }}</span
            >
            <span class="example-option-text">{{ label.value }}</span>
            <span
              class="example-option-check material-symbols-outlined"
              translate="no"
              aria-hidden="true"
              >check</span
            >
          </div>
        }
      </div>
    </div>
  </ng-template>
</ng-template>

app.css

@import url('https://fonts.googleapis.com/icon?family=Material+Symbols+Outlined');

:host {
  display: flex;
  justify-content: center;
  font-family: var(--inter-font);
  --primary: var(--hot-pink);
  --on-primary: var(--page-background);
}

.docs-light-mode {
  --on-primary: #fff;
}

.select {
  display: flex;
  position: relative;
  align-items: center;
  border-radius: 3rem;
  color: var(--on-primary);
  background-color: var(--primary);
  border: 1px solid color-mix(in srgb, var(--primary) 80%, transparent);
  /* Modernized additions for div-trigger Select: */
  height: 3rem;
  padding: 0 2.5rem;
  cursor: pointer;
  box-sizing: border-box;
  width: 16rem;
  user-select: none;
  -webkit-user-select: none;
  outline: none;
}

.select span {
  user-select: none;
  -webkit-user-select: none;
}

.select:hover {
  background-color: color-mix(in srgb, var(--primary) 90%, transparent);
}

.select[aria-disabled='true'] {
  opacity: 0.6;
  cursor: default;
}

.select:focus,
.select:focus-within {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

.combobox-label {
  gap: 1rem;
  left: 1.5rem;
  display: flex;
  position: absolute;
  align-items: center;
  pointer-events: none;
}

.example-arrow {
  right: 1rem;
  position: absolute;
  pointer-events: none;
  transition: transform 150ms ease-in-out;
}

.select[aria-expanded='true'] .example-arrow {
  transform: rotate(180deg);
}

.example-popup-container {
  width: 100%;
  padding: 0.5rem;
  margin-top: 8px;
  border-radius: 2rem;
  background-color: var(--septenary-contrast);
  font-size: 0.9rem;
  max-height: 13rem;
  box-sizing: border-box;
  overflow: hidden;
  animation: smoothPopupOpen 150ms ease-out forwards;
  transform-origin: top;
}

@keyframes smoothPopupOpen {
  0% {
    max-height: 0;
    opacity: 0;
  }
  16.7% {
    opacity: 1;
  }
  100% {
    max-height: 13rem;
    opacity: 1;
  }
}

.example-popup-container.closing {
  animation: smoothPopupClose 150ms ease-in forwards;
}

@keyframes smoothPopupClose {
  0% {
    max-height: 13rem;
    opacity: 1;
  }
  100% {
    max-height: 0;
    opacity: 0;
  }
}

[ngListbox] {
  gap: 2px;
  padding: 2px;
  height: 100%;
  display: flex;
  overflow: auto;
  flex-direction: column;
  outline: none;
}

[ngOption] {
  display: flex;
  cursor: pointer;
  align-items: center;
  padding: 0 1rem;
  min-height: 3rem;
  border-radius: 3rem;
  outline: none;
}

[ngOption]:hover,
[ngOption][data-active='true'] {
  background-color: color-mix(in srgb, var(--primary-contrast) 5%, transparent);
}

[ngOption][data-active='true'] {
  outline-offset: -2px;
  outline: 2px solid var(--primary);
}

[ngOption][aria-selected='true'] {
  color: var(--primary);
  background-color: color-mix(in srgb, var(--primary) 10%, transparent);
}

.example-option-icon {
  font-size: 1.25rem;
  padding-right: 1rem;
}

[ngOption]:not([aria-selected='true']) .example-option-check {
  display: none;
}

.example-option-icon,
.example-option-check {
  font-size: 0.9rem;
}

.example-option-text {
  flex: 1;
}

app.ts

import {Combobox, ComboboxPopup, ComboboxWidget} from '@angular/aria/combobox';
import {Listbox, Option} from '@angular/aria/listbox';
import {OverlayModule} from '@angular/cdk/overlay';
import {afterRenderEffect, Component, computed, signal, viewChild, effect} from '@angular/core';

@Component({
  selector: 'app-root:not([theme="basic-retro"])',
  templateUrl: './app.html',
  styleUrl: './app.css',
  imports: [Combobox, ComboboxPopup, ComboboxWidget, Listbox, Option, OverlayModule],
})
export class App {
  /** The combobox listbox popup. */
  readonly listbox = viewChild(Listbox);

  /** The options available in the listbox. */
  readonly selectedValues = signal<string[]>([]);

  /** The string that is displayed in the combobox. */
  readonly displayValue = computed(() => {
    const values = this.selectedValues();
    if (values.length === 0) {
      return 'Select a label';
    }
    if (values.length === 1) {
      return values[0];
    }
    return `${values[0]} + ${values.length - 1} more`;
  });

  /** The labels that are available for selection. */
  readonly labels = [
    {value: 'Important', icon: 'label'},
    {value: 'Starred', icon: 'star'},
    {value: 'Work', icon: 'work'},
    {value: 'Personal', icon: 'person'},
    {value: 'To Do', icon: 'checklist'},
    {value: 'Later', icon: 'schedule'},
    {value: 'Read', icon: 'menu_book'},
    {value: 'Travel', icon: 'flight'},
  ];

  /** Whether the popup is expanded. */
  readonly popupExpanded = signal(false);

  constructor() {
    // Scrolls to the active item when the active option changes.
    afterRenderEffect(() => {
      this.listbox()?.scrollActiveItemIntoView();
    });
  }
}

app.html

<div
  #combobox="ngCombobox"
  ngCombobox
  [(expanded)]="popupExpanded"
  [preserveContent]="true"
  class="select"
>
  <span class="combobox-label">
    <span class="selected-label-text">{{ displayValue() }}</span>
  </span>
  <span class="example-arrow material-symbols-outlined" translate="no" aria-hidden="true"
    >arrow_drop_down</span
  >
</div>

<ng-template
  [cdkConnectedOverlay]="{origin: combobox.element, usePopover: 'inline', matchWidth: true}"
  [cdkConnectedOverlayOpen]="popupExpanded()"
>
  <ng-template ngComboboxPopup [combobox]="combobox">
    <div class="example-popup-container">
      <div
        #listbox="ngListbox"
        ngListbox
        [multi]="true"
        ngComboboxWidget
        focusMode="activedescendant"
        [tabindex]="-1"
        selectionMode="explicit"
        [(value)]="selectedValues"
        [activeDescendant]="listbox.activeDescendant()"
      >
        @for (label of labels; track label.value) {
          <div ngOption [value]="label.value" [label]="label.value">
            <span
              class="example-option-icon material-symbols-outlined"
              translate="no"
              aria-hidden="true"
              >{{ label.icon }}</span
            >
            <span class="example-option-text">{{ label.value }}</span>
            <span
              class="example-option-check material-symbols-outlined"
              translate="no"
              aria-hidden="true"
              >check</span
            >
          </div>
        }
      </div>
    </div>
  </ng-template>
</ng-template>

app.css

@import url('https://fonts.googleapis.com/icon?family=Material+Symbols+Outlined');
@import url('https://fonts.googleapis.com/css2?family=Press+Start+2P&display=swap');

:host {
  display: flex;
  justify-content: center;
  font-size: 0.8rem;

  font-family: 'Press Start 2P';
  --retro-button-color: color-mix(in srgb, var(--hot-pink) 80%, var(--page-background));
  --retro-shadow-light: color-mix(in srgb, var(--retro-button-color) 90%, #fff);
  --retro-shadow-dark: color-mix(in srgb, var(--retro-button-color) 90%, #000);
  --retro-elevated-shadow:
    inset 4px 4px 0px 0px var(--retro-shadow-light),
    inset -4px -4px 0px 0px var(--retro-shadow-dark), 4px 0px 0px 0px var(--tertiary-contrast),
    0px 4px 0px 0px var(--tertiary-contrast), -4px 0px 0px 0px var(--tertiary-contrast),
    0px -4px 0px 0px var(--tertiary-contrast);
  --retro-flat-shadow:
    4px 0px 0px 0px var(--tertiary-contrast), 0px 4px 0px 0px var(--tertiary-contrast),
    -4px 0px 0px 0px var(--tertiary-contrast), 0px -4px 0px 0px var(--tertiary-contrast);
  --retro-clickable-shadow:
    inset 4px 4px 0px 0px var(--retro-shadow-light),
    inset -4px -4px 0px 0px var(--retro-shadow-dark), 4px 0px 0px 0px var(--tertiary-contrast),
    0px 4px 0px 0px var(--tertiary-contrast), -4px 0px 0px 0px var(--tertiary-contrast),
    0px -4px 0px 0px var(--tertiary-contrast), 8px 8px 0px 0px var(--tertiary-contrast);
  --retro-pressed-shadow:
    inset 4px 4px 0px 0px var(--retro-shadow-dark),
    inset -4px -4px 0px 0px var(--retro-shadow-light), 4px 0px 0px 0px var(--tertiary-contrast),
    0px 4px 0px 0px var(--tertiary-contrast), -4px 0px 0px 0px var(--tertiary-contrast),
    0px -4px 0px 0px var(--tertiary-contrast), 0px 0px 0px 0px var(--tertiary-contrast);
}

.select {
  display: flex;
  position: relative;
  align-items: center;
  color: var(--page-background);
  background-color: var(--hot-pink);
  box-shadow: var(--retro-clickable-shadow);
  /* Modernized additions for div-trigger Select: */
  height: 2.5rem;
  padding: 0 4.5rem;
  cursor: pointer;
  box-sizing: border-box;
  width: 22rem;
  user-select: none;
  -webkit-user-select: none;
  outline: none;
}

.select span {
  user-select: none;
  -webkit-user-select: none;
}

.select:hover,
.select:focus,
.select:focus-within {
  transform: translate(1px, 1px);
}

.select:active {
  transform: translate(4px, 4px);
  box-shadow: var(--retro-pressed-shadow);
  background-color: color-mix(in srgb, var(--retro-button-color) 60%, var(--gray-50));
}

.select[aria-disabled='true'] {
  opacity: 0.6;
  cursor: default;
}

.selected-label-icon {
  font-size: 1.25rem;
}

.select[aria-expanded='false']:focus,
.select[aria-expanded='false']:focus-within {
  outline-offset: 8px;
  outline: 4px dashed var(--hot-pink);
}

.combobox-label {
  gap: 1rem;
  left: 1rem;
  display: flex;
  position: absolute;
  align-items: center;
  pointer-events: none;
}

.example-arrow {
  right: 1rem;
  position: absolute;
  pointer-events: none;
  transition: transform 150ms ease-in-out;
}

.select[aria-expanded='true'] .example-arrow {
  transform: rotate(180deg);
}

.example-popup-container {
  width: 100%;
  padding: 0.5rem;
  margin-top: 20px;
  box-shadow: var(--retro-flat-shadow);
  background-color: var(--septenary-contrast);
  max-height: 11rem;
  box-sizing: border-box;
  overflow: hidden;
  animation: smoothPopupOpen 150ms ease-out forwards;
  transform-origin: top;
}

@keyframes smoothPopupOpen {
  0% {
    max-height: 0;
    opacity: 0;
  }
  16.7% {
    opacity: 1;
  }
  100% {
    max-height: 11rem;
    opacity: 1;
  }
}

.example-popup-container.closing {
  animation: smoothPopupClose 150ms ease-in forwards;
}

@keyframes smoothPopupClose {
  0% {
    max-height: 11rem;
    opacity: 1;
  }
  100% {
    max-height: 0;
    opacity: 0;
  }
}

[ngListbox] {
  gap: 2px;
  height: 100%;
  display: flex;
  overflow: auto;
  flex-direction: column;
  outline: none;
}

[ngOption] {
  display: flex;
  cursor: pointer;
  align-items: center;
  padding: 0 1rem;
  font-size: 0.6rem;
  min-height: 2.25rem;
  outline: none;
}

[ngOption]:hover {
  background-color: color-mix(in srgb, var(--primary-contrast) 5%, transparent);
}

[ngOption][data-active='true'] {
  outline-offset: -2px;
  outline: 2px dashed var(--hot-pink);
}

[ngOption][aria-selected='true'] {
  color: var(--hot-pink);
  background-color: color-mix(in srgb, var(--hot-pink) 5%, transparent);
}

.example-option-icon {
  font-size: 1.25rem;
  padding-right: 1rem;
}

[ngOption]:not([aria-selected='true']) .example-option-check {
  display: none;
}

.example-option-icon,
.example-option-check {
  font-size: 0.9rem;
}

.example-option-text {
  flex: 1;
}

ngListbox üzerindeki multi niteliği çoklu seçimi etkinleştirir. Seçenekleri değiştirmek için Boşluk'a basın ve açılır pencere ek seçimler için açık kalır. Gösterim, ilk seçili öğeyi ardından kalan seçimlerin sayısını gösterir.

Özel görünümlü çoklu seçim

Seçeneklerin genellikle kullanıcıların seçimleri tanımasına yardımcı olacak simgeler veya renkler gibi görsel göstergelere ihtiyacı vardır. Seçenekler içindeki özel şablonlar, görünüm değeri kompakt bir özet gösterirken zengin biçimlendirme sağlar.

app.ts

import {Combobox, ComboboxPopup, ComboboxWidget} from '@angular/aria/combobox';
import {Listbox, Option} from '@angular/aria/listbox';
import {OverlayModule} from '@angular/cdk/overlay';
import {afterRenderEffect, Component, computed, signal, viewChild, effect} from '@angular/core';

@Component({
  selector: 'app-root:not([theme="icons-basic"])',
  templateUrl: './app.html',
  styleUrl: './app.css',
  imports: [Combobox, ComboboxPopup, ComboboxWidget, Listbox, Option, OverlayModule],
})
export class App {
  /** The combobox listbox popup. */
  readonly listbox = viewChild(Listbox);

  /** The options available in the listbox. */
  readonly selectedValues = signal<string[]>([]);

  /** The icon that is displayed in the combobox. */
  readonly displayIcon = computed(() => {
    const values = this.selectedValues();
    const label = this.labels.find((label) => label.value === values[0]);
    return label ? label.icon : '';
  });

  /** The string that is displayed in the combobox. */
  readonly displayValue = computed(() => {
    const values = this.selectedValues();
    if (values.length === 0) {
      return 'Select a label';
    }
    if (values.length === 1) {
      return values[0];
    }
    return `${values[0]} + ${values.length - 1} more`;
  });

  /** The labels that are available for selection. */
  readonly labels = [
    {value: 'Important', icon: 'label'},
    {value: 'Starred', icon: 'star'},
    {value: 'Work', icon: 'work'},
    {value: 'Personal', icon: 'person'},
    {value: 'To Do', icon: 'checklist'},
    {value: 'Later', icon: 'schedule'},
    {value: 'Read', icon: 'menu_book'},
    {value: 'Travel', icon: 'flight'},
  ];

  /** Whether the popup is expanded. */
  readonly popupExpanded = signal(false);

  constructor() {
    // Scrolls to the active item when the active option changes.
    afterRenderEffect(() => {
      this.listbox()?.scrollActiveItemIntoView();
    });
  }
}

app.html

<div
  #combobox="ngCombobox"
  ngCombobox
  [(expanded)]="popupExpanded"
  [preserveContent]="true"
  class="select"
>
  <span class="combobox-label">
    <span class="selected-label-icon material-symbols-outlined" translate="no" aria-hidden="true">{{
      displayIcon()
    }}</span>
    <span class="selected-label-text">{{ displayValue() }}</span>
  </span>
  <span class="example-arrow material-symbols-outlined" translate="no" aria-hidden="true"
    >arrow_drop_down</span
  >
</div>

<ng-template
  [cdkConnectedOverlay]="{origin: combobox.element, usePopover: 'inline', matchWidth: true}"
  [cdkConnectedOverlayOpen]="popupExpanded()"
>
  <ng-template ngComboboxPopup [combobox]="combobox">
    <div class="example-popup-container">
      <div
        #listbox="ngListbox"
        ngListbox
        [multi]="true"
        ngComboboxWidget
        focusMode="activedescendant"
        [tabindex]="-1"
        selectionMode="explicit"
        [(value)]="selectedValues"
        [activeDescendant]="listbox.activeDescendant()"
      >
        @for (label of labels; track label.value) {
          <div ngOption [value]="label.value" [label]="label.value">
            <span
              class="example-option-icon material-symbols-outlined"
              translate="no"
              aria-hidden="true"
              >{{ label.icon }}</span
            >
            <span class="example-option-text">{{ label.value }}</span>
            <span
              class="example-option-check material-symbols-outlined"
              translate="no"
              aria-hidden="true"
              >check</span
            >
          </div>
        }
      </div>
    </div>
  </ng-template>
</ng-template>

app.css

@import url('https://fonts.googleapis.com/icon?family=Material+Symbols+Outlined');

:host {
  display: flex;
  justify-content: center;
  font-family: var(--inter-font);
}

.select {
  display: flex;
  position: relative;
  align-items: center;
  color: color-mix(in srgb, var(--hot-pink) 90%, var(--primary-contrast));
  background-color: color-mix(in srgb, var(--hot-pink) 5%, transparent);
  border-radius: 0.5rem;
  border: 1px solid color-mix(in srgb, var(--hot-pink) 80%, transparent);
  /* Modernized additions for div-trigger Select: */
  height: 2.5rem;
  padding: 0 3.5rem;
  cursor: pointer;
  box-sizing: border-box;
  width: 16rem;
  user-select: none;
  -webkit-user-select: none;
  outline: none;
}

.select span {
  user-select: none;
  -webkit-user-select: none;
}

.select:hover {
  background-color: color-mix(in srgb, var(--hot-pink) 15%, transparent);
}

.select[aria-disabled='true'] {
  opacity: 0.6;
  cursor: default;
}

.selected-label-icon {
  font-size: 1.25rem;
}

.select:focus,
.select:focus-within {
  outline: 2px solid color-mix(in srgb, var(--hot-pink) 50%, transparent);
}

.combobox-label {
  gap: 1rem;
  left: 1rem;
  display: flex;
  position: absolute;
  align-items: center;
  pointer-events: none;
}

.example-arrow {
  right: 1rem;
  position: absolute;
  pointer-events: none;
  transition: transform 150ms ease-in-out;
}

.select[aria-expanded='true'] .example-arrow {
  transform: rotate(180deg);
}

.example-popup-container {
  width: 100%;
  padding: 0.5rem;
  margin-top: 8px;
  border-radius: 0.5rem;
  background-color: var(--septenary-contrast);
  font-size: 0.9rem;
  max-height: 11rem;
  box-sizing: border-box;
  overflow: hidden;
  animation: smoothPopupOpen 150ms ease-out forwards;
  transform-origin: top;
}

@keyframes smoothPopupOpen {
  0% {
    max-height: 0;
    opacity: 0;
  }
  16.7% {
    opacity: 1;
  }
  100% {
    max-height: 11rem;
    opacity: 1;
  }
}

.example-popup-container.closing {
  animation: smoothPopupClose 150ms ease-in forwards;
}

@keyframes smoothPopupClose {
  0% {
    max-height: 11rem;
    opacity: 1;
  }
  100% {
    max-height: 0;
    opacity: 0;
  }
}

[ngListbox] {
  gap: 2px;
  height: 100%;
  display: flex;
  overflow: auto;
  flex-direction: column;
  outline: none;
}

[ngOption] {
  display: flex;
  cursor: pointer;
  align-items: center;
  margin: 1px;
  padding: 0 1rem;
  min-height: 2.25rem;
  border-radius: 0.5rem;
  outline: none;
}

[ngOption]:hover {
  background-color: color-mix(in srgb, var(--primary-contrast) 5%, transparent);
}

[ngOption][data-active='true'] {
  outline-offset: -2px;
  outline: 2px solid color-mix(in srgb, var(--hot-pink) 50%, transparent);
}

[ngOption][aria-selected='true'] {
  color: var(--hot-pink);
  background-color: color-mix(in srgb, var(--hot-pink) 5%, transparent);
}

.example-option-icon {
  font-size: 1.25rem;
  padding-right: 1rem;
}

[ngOption]:not([aria-selected='true']) .example-option-check {
  display: none;
}

.example-option-icon,
.example-option-check {
  font-size: 0.9rem;
}

.example-option-text {
  flex: 1;
}

app.ts

import {Combobox, ComboboxPopup, ComboboxWidget} from '@angular/aria/combobox';
import {Listbox, Option} from '@angular/aria/listbox';
import {OverlayModule} from '@angular/cdk/overlay';
import {afterRenderEffect, Component, computed, signal, viewChild, effect} from '@angular/core';

@Component({
  selector: 'app-root:not([theme="icons-material"])',
  templateUrl: './app.html',
  styleUrl: './app.css',
  imports: [Combobox, ComboboxPopup, ComboboxWidget, Listbox, Option, OverlayModule],
})
export class App {
  /** The combobox listbox popup. */
  readonly listbox = viewChild(Listbox);

  /** The options available in the listbox. */
  readonly selectedValues = signal<string[]>([]);

  /** The icon that is displayed in the combobox. */
  readonly displayIcon = computed(() => {
    const values = this.selectedValues();
    const label = this.labels.find((label) => label.value === values[0]);
    return label ? label.icon : '';
  });

  /** The string that is displayed in the combobox. */
  readonly displayValue = computed(() => {
    const values = this.selectedValues();
    if (values.length === 0) {
      return 'Select a label';
    }
    if (values.length === 1) {
      return values[0];
    }
    return `${values[0]} + ${values.length - 1} more`;
  });

  /** The labels that are available for selection. */
  readonly labels = [
    {value: 'Important', icon: 'label'},
    {value: 'Starred', icon: 'star'},
    {value: 'Work', icon: 'work'},
    {value: 'Personal', icon: 'person'},
    {value: 'To Do', icon: 'checklist'},
    {value: 'Later', icon: 'schedule'},
    {value: 'Read', icon: 'menu_book'},
    {value: 'Travel', icon: 'flight'},
  ];

  /** Whether the popup is expanded. */
  readonly popupExpanded = signal(false);

  constructor() {
    // Scrolls to the active item when the active option changes.
    afterRenderEffect(() => {
      this.listbox()?.scrollActiveItemIntoView();
    });
  }
}

app.html

<div
  #combobox="ngCombobox"
  ngCombobox
  [(expanded)]="popupExpanded"
  [preserveContent]="true"
  class="select"
>
  <span class="combobox-label">
    <span class="selected-label-icon material-symbols-outlined" translate="no" aria-hidden="true">{{
      displayIcon()
    }}</span>
    <span class="selected-label-text">{{ displayValue() }}</span>
  </span>
  <span class="example-arrow material-symbols-outlined" translate="no" aria-hidden="true"
    >arrow_drop_down</span
  >
</div>

<ng-template
  [cdkConnectedOverlay]="{origin: combobox.element, usePopover: 'inline', matchWidth: true}"
  [cdkConnectedOverlayOpen]="popupExpanded()"
>
  <ng-template ngComboboxPopup [combobox]="combobox">
    <div class="example-popup-container">
      <div
        #listbox="ngListbox"
        ngListbox
        [multi]="true"
        ngComboboxWidget
        focusMode="activedescendant"
        [tabindex]="-1"
        selectionMode="explicit"
        [(value)]="selectedValues"
        [activeDescendant]="listbox.activeDescendant()"
      >
        @for (label of labels; track label.value) {
          <div ngOption [value]="label.value" [label]="label.value">
            <span
              class="example-option-icon material-symbols-outlined"
              translate="no"
              aria-hidden="true"
              >{{ label.icon }}</span
            >
            <span class="example-option-text">{{ label.value }}</span>
            <span
              class="example-option-check material-symbols-outlined"
              translate="no"
              aria-hidden="true"
              >check</span
            >
          </div>
        }
      </div>
    </div>
  </ng-template>
</ng-template>

app.css

@import url('https://fonts.googleapis.com/icon?family=Material+Symbols+Outlined');

:host {
  display: flex;
  justify-content: center;
  font-family: var(--inter-font);
  --primary: var(--hot-pink);
  --on-primary: var(--page-background);
}

.docs-light-mode {
  --on-primary: #fff;
}

.select {
  display: flex;
  position: relative;
  align-items: center;
  border-radius: 3rem;
  color: var(--on-primary);
  background-color: var(--primary);
  border: 1px solid color-mix(in srgb, var(--primary) 80%, transparent);
  /* Modernized additions for div-trigger Select: */
  height: 3rem;
  padding: 0 3.5rem;
  cursor: pointer;
  box-sizing: border-box;
  width: 16rem;
  user-select: none;
  -webkit-user-select: none;
  outline: none;
}

.select span {
  user-select: none;
  -webkit-user-select: none;
}

.select:hover {
  background-color: color-mix(in srgb, var(--primary) 90%, transparent);
}

.select[aria-disabled='true'] {
  opacity: 0.6;
  cursor: default;
}

.selected-label-icon {
  font-size: 1.25rem;
}

.select:focus,
.select:focus-within {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

.combobox-label {
  gap: 1rem;
  left: 1rem;
  display: flex;
  position: absolute;
  align-items: center;
  pointer-events: none;
}

.example-arrow {
  right: 1rem;
  position: absolute;
  pointer-events: none;
  transition: transform 150ms ease-in-out;
}

.select[aria-expanded='true'] .example-arrow {
  transform: rotate(180deg);
}

.example-popup-container {
  width: 100%;
  padding: 0.5rem;
  margin-top: 8px;
  border-radius: 2rem;
  background-color: var(--septenary-contrast);
  font-size: 0.9rem;
  max-height: 13rem;
  box-sizing: border-box;
  overflow: hidden;
  animation: smoothPopupOpen 150ms ease-out forwards;
  transform-origin: top;
}

@keyframes smoothPopupOpen {
  0% {
    max-height: 0;
    opacity: 0;
  }
  16.7% {
    opacity: 1;
  }
  100% {
    max-height: 13rem;
    opacity: 1;
  }
}

.example-popup-container.closing {
  animation: smoothPopupClose 150ms ease-in forwards;
}

@keyframes smoothPopupClose {
  0% {
    max-height: 13rem;
    opacity: 1;
  }
  100% {
    max-height: 0;
    opacity: 0;
  }
}

[ngListbox] {
  gap: 2px;
  padding: 2px;
  height: 100%;
  display: flex;
  overflow: auto;
  flex-direction: column;
  outline: none;
}

[ngOption] {
  display: flex;
  cursor: pointer;
  align-items: center;
  padding: 0 1rem;
  min-height: 3rem;
  border-radius: 3rem;
  outline: none;
}

[ngOption]:hover,
[ngOption][data-active='true'] {
  background-color: color-mix(in srgb, var(--primary-contrast) 5%, transparent);
}

[ngOption][data-active='true'] {
  outline-offset: -2px;
  outline: 2px solid var(--primary);
}

[ngOption][aria-selected='true'] {
  color: var(--primary);
  background-color: color-mix(in srgb, var(--primary) 10%, transparent);
}

.example-option-icon {
  font-size: 1.25rem;
  padding-right: 1rem;
}

[ngOption]:not([aria-selected='true']) .example-option-check {
  display: none;
}

.example-option-icon,
.example-option-check {
  font-size: 0.9rem;
}

.example-option-text {
  flex: 1;
}

app.ts

import {Combobox, ComboboxPopup, ComboboxWidget} from '@angular/aria/combobox';
import {Listbox, Option} from '@angular/aria/listbox';
import {OverlayModule} from '@angular/cdk/overlay';
import {afterRenderEffect, Component, computed, signal, viewChild, effect} from '@angular/core';

@Component({
  selector: 'app-root:not([theme="icons-retro"])',
  templateUrl: './app.html',
  styleUrl: './app.css',
  imports: [Combobox, ComboboxPopup, ComboboxWidget, Listbox, Option, OverlayModule],
})
export class App {
  /** The combobox listbox popup. */
  readonly listbox = viewChild(Listbox);

  /** The options available in the listbox. */
  readonly selectedValues = signal<string[]>([]);

  /** The icon that is displayed in the combobox. */
  readonly displayIcon = computed(() => {
    const values = this.selectedValues();
    const label = this.labels.find((label) => label.value === values[0]);
    return label ? label.icon : '';
  });

  /** The string that is displayed in the combobox. */
  readonly displayValue = computed(() => {
    const values = this.selectedValues();
    if (values.length === 0) {
      return 'Select a label';
    }
    if (values.length === 1) {
      return values[0];
    }
    return `${values[0]} + ${values.length - 1} more`;
  });

  /** The labels that are available for selection. */
  readonly labels = [
    {value: 'Important', icon: 'label'},
    {value: 'Starred', icon: 'star'},
    {value: 'Work', icon: 'work'},
    {value: 'Personal', icon: 'person'},
    {value: 'To Do', icon: 'checklist'},
    {value: 'Later', icon: 'schedule'},
    {value: 'Read', icon: 'menu_book'},
    {value: 'Travel', icon: 'flight'},
  ];

  /** Whether the popup is expanded. */
  readonly popupExpanded = signal(false);

  constructor() {
    // Scrolls to the active item when the active option changes.
    afterRenderEffect(() => {
      this.listbox()?.scrollActiveItemIntoView();
    });
  }
}

app.html

<div
  #combobox="ngCombobox"
  ngCombobox
  [(expanded)]="popupExpanded"
  [preserveContent]="true"
  class="select"
>
  <span class="combobox-label">
    <span class="selected-label-icon material-symbols-outlined" translate="no" aria-hidden="true">{{
      displayIcon()
    }}</span>
    <span class="selected-label-text">{{ displayValue() }}</span>
  </span>
  <span class="example-arrow material-symbols-outlined" translate="no" aria-hidden="true"
    >arrow_drop_down</span
  >
</div>

<ng-template
  [cdkConnectedOverlay]="{origin: combobox.element, usePopover: 'inline', matchWidth: true}"
  [cdkConnectedOverlayOpen]="popupExpanded()"
>
  <ng-template ngComboboxPopup [combobox]="combobox">
    <div class="example-popup-container">
      <div
        #listbox="ngListbox"
        ngListbox
        [multi]="true"
        ngComboboxWidget
        focusMode="activedescendant"
        [tabindex]="-1"
        selectionMode="explicit"
        [(value)]="selectedValues"
        [activeDescendant]="listbox.activeDescendant()"
      >
        @for (label of labels; track label.value) {
          <div ngOption [value]="label.value" [label]="label.value">
            <span
              class="example-option-icon material-symbols-outlined"
              translate="no"
              aria-hidden="true"
              >{{ label.icon }}</span
            >
            <span class="example-option-text">{{ label.value }}</span>
            <span
              class="example-option-check material-symbols-outlined"
              translate="no"
              aria-hidden="true"
              >check</span
            >
          </div>
        }
      </div>
    </div>
  </ng-template>
</ng-template>

app.css

@import url('https://fonts.googleapis.com/icon?family=Material+Symbols+Outlined');
@import url('https://fonts.googleapis.com/css2?family=Press+Start+2P&display=swap');

:host {
  display: flex;
  justify-content: center;
  font-size: 0.8rem;

  font-family: 'Press Start 2P';
  --retro-button-color: color-mix(in srgb, var(--hot-pink) 80%, var(--page-background));
  --retro-shadow-light: color-mix(in srgb, var(--retro-button-color) 90%, #fff);
  --retro-shadow-dark: color-mix(in srgb, var(--retro-button-color) 90%, #000);
  --retro-elevated-shadow:
    inset 4px 4px 0px 0px var(--retro-shadow-light),
    inset -4px -4px 0px 0px var(--retro-shadow-dark), 4px 0px 0px 0px var(--tertiary-contrast),
    0px 4px 0px 0px var(--tertiary-contrast), -4px 0px 0px 0px var(--tertiary-contrast),
    0px -4px 0px 0px var(--tertiary-contrast);
  --retro-flat-shadow:
    4px 0px 0px 0px var(--tertiary-contrast), 0px 4px 0px 0px var(--tertiary-contrast),
    -4px 0px 0px 0px var(--tertiary-contrast), 0px -4px 0px 0px var(--tertiary-contrast);
  --retro-clickable-shadow:
    inset 4px 4px 0px 0px var(--retro-shadow-light),
    inset -4px -4px 0px 0px var(--retro-shadow-dark), 4px 0px 0px 0px var(--tertiary-contrast),
    0px 4px 0px 0px var(--tertiary-contrast), -4px 0px 0px 0px var(--tertiary-contrast),
    0px -4px 0px 0px var(--tertiary-contrast), 8px 8px 0px 0px var(--tertiary-contrast);
  --retro-pressed-shadow:
    inset 4px 4px 0px 0px var(--retro-shadow-dark),
    inset -4px -4px 0px 0px var(--retro-shadow-light), 4px 0px 0px 0px var(--tertiary-contrast),
    0px 4px 0px 0px var(--tertiary-contrast), -4px 0px 0px 0px var(--tertiary-contrast),
    0px -4px 0px 0px var(--tertiary-contrast), 0px 0px 0px 0px var(--tertiary-contrast);
}

.select {
  display: flex;
  position: relative;
  align-items: center;
  color: var(--page-background);
  background-color: var(--hot-pink);
  box-shadow: var(--retro-clickable-shadow);
  /* Modernized additions for div-trigger Select: */
  height: 2.5rem;
  padding: 0 4.5rem;
  cursor: pointer;
  box-sizing: border-box;
  width: 22rem;
  user-select: none;
  -webkit-user-select: none;
  outline: none;
}

.select span {
  user-select: none;
  -webkit-user-select: none;
}

.select:hover,
.select:focus,
.select:focus-within {
  transform: translate(1px, 1px);
}

.select:active {
  transform: translate(4px, 4px);
  box-shadow: var(--retro-pressed-shadow);
  background-color: color-mix(in srgb, var(--retro-button-color) 60%, var(--gray-50));
}

.select[aria-disabled='true'] {
  opacity: 0.6;
  cursor: default;
}

.selected-label-icon {
  font-size: 1.25rem;
}

.select[aria-expanded='false']:focus,
.select[aria-expanded='false']:focus-within {
  outline-offset: 8px;
  outline: 4px dashed var(--hot-pink);
}

.combobox-label {
  gap: 1rem;
  left: 1rem;
  display: flex;
  position: absolute;
  align-items: center;
  pointer-events: none;
}

.example-arrow {
  right: 1rem;
  position: absolute;
  pointer-events: none;
  transition: transform 150ms ease-in-out;
}

.select[aria-expanded='true'] .example-arrow {
  transform: rotate(180deg);
}

.example-popup-container {
  width: 100%;
  padding: 0.5rem;
  margin-top: 20px;
  box-shadow: var(--retro-flat-shadow);
  background-color: var(--septenary-contrast);
  max-height: 11rem;
  box-sizing: border-box;
  overflow: hidden;
  animation: smoothPopupOpen 150ms ease-out forwards;
  transform-origin: top;
}

@keyframes smoothPopupOpen {
  0% {
    max-height: 0;
    opacity: 0;
  }
  16.7% {
    opacity: 1;
  }
  100% {
    max-height: 11rem;
    opacity: 1;
  }
}

.example-popup-container.closing {
  animation: smoothPopupClose 150ms ease-in forwards;
}

@keyframes smoothPopupClose {
  0% {
    max-height: 11rem;
    opacity: 1;
  }
  100% {
    max-height: 0;
    opacity: 0;
  }
}

[ngListbox] {
  gap: 2px;
  height: 100%;
  display: flex;
  overflow: auto;
  flex-direction: column;
  outline: none;
}

[ngOption] {
  display: flex;
  cursor: pointer;
  align-items: center;
  padding: 0 1rem;
  font-size: 0.6rem;
  min-height: 2.25rem;
  outline: none;
}

[ngOption]:hover {
  background-color: color-mix(in srgb, var(--primary-contrast) 5%, transparent);
}

[ngOption][data-active='true'] {
  outline-offset: -2px;
  outline: 2px dashed var(--hot-pink);
}

[ngOption][aria-selected='true'] {
  color: var(--hot-pink);
  background-color: color-mix(in srgb, var(--hot-pink) 5%, transparent);
}

.example-option-icon {
  font-size: 1.25rem;
  padding-right: 1rem;
}

[ngOption]:not([aria-selected='true']) .example-option-check {
  display: none;
}

.example-option-icon,
.example-option-check {
  font-size: 0.9rem;
}

.example-option-text {
  flex: 1;
}

Her seçenek etiketinin yanında bir simge gösterir. Görünüm değeri, seçilen seçeneğin simgesini ve metnini, ardından ek seçimlerin sayısını göstermek üzere güncellenir. Seçili seçenekler net görsel geri bildirim için bir onay işareti gösterir.

Kontrollü seçim

Formlar bazen seçim sayısını sınırlamak veya kullanıcı seçimlerini doğrulamak gerektirir. Seçim üzerinde programatik kontrol, erişilebilirliği korurken bu kısıtlamaları sağlar.

app.ts

import {Combobox, ComboboxPopup, ComboboxWidget} from '@angular/aria/combobox';
import {Listbox, Option} from '@angular/aria/listbox';
import {OverlayModule} from '@angular/cdk/overlay';
import {afterRenderEffect, Component, computed, signal, viewChild, effect} from '@angular/core';

@Component({
  selector: 'app-root:not([theme="limited-basic"])',
  templateUrl: './app.html',
  styleUrl: './app.css',
  imports: [Combobox, ComboboxPopup, ComboboxWidget, Listbox, Option, OverlayModule],
})
export class App {
  /** The combobox listbox popup. */
  readonly listbox = viewChild(Listbox);

  /** The options available in the listbox. */
  readonly selectedValues = signal<string[]>([]);

  /** The string that is displayed in the combobox. */
  readonly displayValue = computed(() => {
    const values = this.selectedValues();
    if (values.length === 0) {
      return 'Select 2 labels';
    }
    if (values.length === 1) {
      return values[0];
    }
    return `${values[0]} & ${values[1]}`;
  });

  /** The labels that are available for selection. */
  readonly labels = [
    {value: 'Important', disabled: computed(() => this.isOptionDisabled('Important'))},
    {value: 'Starred', disabled: computed(() => this.isOptionDisabled('Starred'))},
    {value: 'Work', disabled: computed(() => this.isOptionDisabled('Work'))},
    {value: 'Personal', disabled: computed(() => this.isOptionDisabled('Personal'))},
    {value: 'To Do', disabled: computed(() => this.isOptionDisabled('To Do'))},
    {value: 'Later', disabled: computed(() => this.isOptionDisabled('Later'))},
    {value: 'Read', disabled: computed(() => this.isOptionDisabled('Read'))},
    {value: 'Travel', disabled: computed(() => this.isOptionDisabled('Travel'))},
  ];

  /** Whether the popup is expanded. */
  readonly popupExpanded = signal(false);

  constructor() {
    // Scrolls to the active item when the active option changes.
    afterRenderEffect(() => {
      this.listbox()?.scrollActiveItemIntoView();
    });
  }

  isOptionDisabled(value: string) {
    const values = this.selectedValues();
    if (!values || values.length < 2) {
      return false;
    }
    return !values.includes(value);
  }
}

app.html

<div
  #combobox="ngCombobox"
  ngCombobox
  [(expanded)]="popupExpanded"
  [preserveContent]="true"
  class="select"
>
  <span class="combobox-label">
    <span class="selected-label-text">{{ displayValue() }}</span>
  </span>
  <span class="example-arrow material-symbols-outlined" translate="no" aria-hidden="true"
    >arrow_drop_down</span
  >
</div>

<ng-template
  [cdkConnectedOverlay]="{origin: combobox.element, usePopover: 'inline', matchWidth: true}"
  [cdkConnectedOverlayOpen]="popupExpanded()"
>
  <ng-template ngComboboxPopup [combobox]="combobox">
    <div class="example-popup-container">
      <div
        #listbox="ngListbox"
        ngListbox
        [multi]="true"
        ngComboboxWidget
        focusMode="activedescendant"
        [tabindex]="-1"
        selectionMode="explicit"
        [(value)]="selectedValues"
        [activeDescendant]="listbox.activeDescendant()"
      >
        @for (label of labels; track label.value) {
          <div ngOption [value]="label.value" [label]="label.value" [disabled]="label.disabled()">
            <span class="example-option-text">{{ label.value }}</span>
            <span
              class="example-option-check material-symbols-outlined"
              translate="no"
              aria-hidden="true"
              >check</span
            >
          </div>
        }
      </div>
    </div>
  </ng-template>
</ng-template>

app.css

@import url('https://fonts.googleapis.com/icon?family=Material+Symbols+Outlined');

:host {
  display: flex;
  justify-content: center;
  font-family: var(--inter-font);
}

.select {
  display: flex;
  position: relative;
  align-items: center;
  color: color-mix(in srgb, var(--hot-pink) 90%, var(--primary-contrast));
  background-color: color-mix(in srgb, var(--hot-pink) 5%, transparent);
  border-radius: 0.5rem;
  border: 1px solid color-mix(in srgb, var(--hot-pink) 80%, transparent);
  /* Modernized additions for div-trigger Select: */
  height: 2.5rem;
  padding: 0 2.5rem;
  cursor: pointer;
  box-sizing: border-box;
  width: 16rem;
  user-select: none;
  -webkit-user-select: none;
  outline: none;
}

.select span {
  user-select: none;
  -webkit-user-select: none;
}

.select:hover {
  background-color: color-mix(in srgb, var(--hot-pink) 15%, transparent);
}

.select[aria-disabled='true'] {
  opacity: 0.6;
  cursor: default;
}

.select:focus,
.select:focus-within {
  outline: 2px solid color-mix(in srgb, var(--hot-pink) 50%, transparent);
}

.combobox-label {
  gap: 1rem;
  left: 1.5rem;
  display: flex;
  position: absolute;
  align-items: center;
  pointer-events: none;
}

.example-arrow {
  right: 1rem;
  position: absolute;
  pointer-events: none;
  transition: transform 150ms ease-in-out;
}

.select[aria-expanded='true'] .example-arrow {
  transform: rotate(180deg);
}

.example-popup-container {
  width: 100%;
  padding: 0.5rem;
  margin-top: 8px;
  border-radius: 0.5rem;
  background-color: var(--septenary-contrast);
  font-size: 0.9rem;
  max-height: 11rem;
  box-sizing: border-box;
  overflow: hidden;
  animation: smoothPopupOpen 150ms ease-out forwards;
  transform-origin: top;
}

@keyframes smoothPopupOpen {
  0% {
    max-height: 0;
    opacity: 0;
  }
  16.7% {
    opacity: 1;
  }
  100% {
    max-height: 11rem;
    opacity: 1;
  }
}

.example-popup-container.closing {
  animation: smoothPopupClose 150ms ease-in forwards;
}

@keyframes smoothPopupClose {
  0% {
    max-height: 11rem;
    opacity: 1;
  }
  100% {
    max-height: 0;
    opacity: 0;
  }
}

[ngListbox] {
  gap: 2px;
  height: 100%;
  display: flex;
  overflow: auto;
  flex-direction: column;
  outline: none;
}

[ngOption] {
  display: flex;
  cursor: pointer;
  align-items: center;
  margin: 1px;
  padding: 0 1rem;
  min-height: 2.25rem;
  border-radius: 0.5rem;
  outline: none;
}

[ngOption]:hover {
  background-color: color-mix(in srgb, var(--primary-contrast) 5%, transparent);
}

[ngOption][data-active='true'] {
  outline-offset: -2px;
  outline: 2px solid color-mix(in srgb, var(--hot-pink) 50%, transparent);
}

[ngOption][aria-selected='true'] {
  color: var(--hot-pink);
  background-color: color-mix(in srgb, var(--hot-pink) 5%, transparent);
}

[ngOption]:not([aria-selected='true']) .example-option-check {
  display: none;
}

[ngOption][aria-disabled='true'] {
  opacity: 0.6;
  cursor: default;
}

[ngOption][aria-disabled='true']:hover {
  background-color: transparent;
}

.example-option-check {
  font-size: 0.9rem;
}

.example-option-text {
  flex: 1;
}

app.ts

import {Combobox, ComboboxPopup, ComboboxWidget} from '@angular/aria/combobox';
import {Listbox, Option} from '@angular/aria/listbox';
import {OverlayModule} from '@angular/cdk/overlay';
import {afterRenderEffect, Component, computed, signal, viewChild, effect} from '@angular/core';

@Component({
  selector: 'app-root:not([theme="limited-material"])',
  templateUrl: './app.html',
  styleUrl: './app.css',
  imports: [Combobox, ComboboxPopup, ComboboxWidget, Listbox, Option, OverlayModule],
})
export class App {
  /** The combobox listbox popup. */
  readonly listbox = viewChild(Listbox);

  /** The options available in the listbox. */
  readonly selectedValues = signal<string[]>([]);

  /** The string that is displayed in the combobox. */
  readonly displayValue = computed(() => {
    const values = this.selectedValues();
    if (values.length === 0) {
      return 'Select 2 labels';
    }
    if (values.length === 1) {
      return values[0];
    }
    return `${values[0]} & ${values[1]}`;
  });

  /** The labels that are available for selection. */
  readonly labels = [
    {value: 'Important', disabled: computed(() => this.isOptionDisabled('Important'))},
    {value: 'Starred', disabled: computed(() => this.isOptionDisabled('Starred'))},
    {value: 'Work', disabled: computed(() => this.isOptionDisabled('Work'))},
    {value: 'Personal', disabled: computed(() => this.isOptionDisabled('Personal'))},
    {value: 'To Do', disabled: computed(() => this.isOptionDisabled('To Do'))},
    {value: 'Later', disabled: computed(() => this.isOptionDisabled('Later'))},
    {value: 'Read', disabled: computed(() => this.isOptionDisabled('Read'))},
    {value: 'Travel', disabled: computed(() => this.isOptionDisabled('Travel'))},
  ];

  /** Whether the popup is expanded. */
  readonly popupExpanded = signal(false);

  constructor() {
    // Scrolls to the active item when the active option changes.
    afterRenderEffect(() => {
      this.listbox()?.scrollActiveItemIntoView();
    });
  }

  isOptionDisabled(value: string) {
    const values = this.selectedValues();
    if (!values || values.length < 2) {
      return false;
    }
    return !values.includes(value);
  }
}

app.html

<div
  #combobox="ngCombobox"
  ngCombobox
  [(expanded)]="popupExpanded"
  [preserveContent]="true"
  class="select"
>
  <span class="combobox-label">
    <span class="selected-label-text">{{ displayValue() }}</span>
  </span>
  <span class="example-arrow material-symbols-outlined" translate="no" aria-hidden="true"
    >arrow_drop_down</span
  >
</div>

<ng-template
  [cdkConnectedOverlay]="{origin: combobox.element, usePopover: 'inline', matchWidth: true}"
  [cdkConnectedOverlayOpen]="popupExpanded()"
>
  <ng-template ngComboboxPopup [combobox]="combobox">
    <div class="example-popup-container">
      <div
        #listbox="ngListbox"
        ngListbox
        [multi]="true"
        ngComboboxWidget
        focusMode="activedescendant"
        [tabindex]="-1"
        selectionMode="explicit"
        [(value)]="selectedValues"
        [activeDescendant]="listbox.activeDescendant()"
      >
        @for (label of labels; track label.value) {
          <div ngOption [value]="label.value" [label]="label.value" [disabled]="label.disabled()">
            <span class="example-option-text">{{ label.value }}</span>
            <span
              class="example-option-check material-symbols-outlined"
              translate="no"
              aria-hidden="true"
              >check</span
            >
          </div>
        }
      </div>
    </div>
  </ng-template>
</ng-template>

app.css

@import url('https://fonts.googleapis.com/icon?family=Material+Symbols+Outlined');

:host {
  display: flex;
  justify-content: center;
  font-family: var(--inter-font);
  --primary: var(--hot-pink);
  --on-primary: var(--page-background);
}

.docs-light-mode {
  --on-primary: #fff;
}

.select {
  display: flex;
  position: relative;
  align-items: center;
  border-radius: 3rem;
  color: var(--on-primary);
  background-color: var(--primary);
  border: 1px solid color-mix(in srgb, var(--primary) 80%, transparent);
  /* Modernized additions for div-trigger Select: */
  height: 3rem;
  padding: 0 2.5rem;
  cursor: pointer;
  box-sizing: border-box;
  width: 16rem;
  user-select: none;
  -webkit-user-select: none;
  outline: none;
}

.select span {
  user-select: none;
  -webkit-user-select: none;
}

.select:hover {
  background-color: color-mix(in srgb, var(--primary) 90%, transparent);
}

.select[aria-disabled='true'] {
  opacity: 0.6;
  cursor: default;
}

.select:focus,
.select:focus-within {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

.combobox-label {
  gap: 1rem;
  left: 1.5rem;
  display: flex;
  position: absolute;
  align-items: center;
  pointer-events: none;
}

.example-arrow {
  right: 1rem;
  position: absolute;
  pointer-events: none;
  transition: transform 150ms ease-in-out;
}

.select[aria-expanded='true'] .example-arrow {
  transform: rotate(180deg);
}

.example-popup-container {
  width: 100%;
  padding: 0.5rem;
  margin-top: 8px;
  border-radius: 2rem;
  background-color: var(--septenary-contrast);
  font-size: 0.9rem;
  max-height: 13rem;
  box-sizing: border-box;
  overflow: hidden;
  animation: smoothPopupOpen 150ms ease-out forwards;
  transform-origin: top;
}

@keyframes smoothPopupOpen {
  0% {
    max-height: 0;
    opacity: 0;
  }
  16.7% {
    opacity: 1;
  }
  100% {
    max-height: 13rem;
    opacity: 1;
  }
}

.example-popup-container.closing {
  animation: smoothPopupClose 150ms ease-in forwards;
}

@keyframes smoothPopupClose {
  0% {
    max-height: 13rem;
    opacity: 1;
  }
  100% {
    max-height: 0;
    opacity: 0;
  }
}

[ngListbox] {
  gap: 2px;
  padding: 2px;
  height: 100%;
  display: flex;
  overflow: auto;
  flex-direction: column;
  outline: none;
}

[ngOption] {
  display: flex;
  cursor: pointer;
  align-items: center;
  padding: 0 1rem;
  min-height: 3rem;
  border-radius: 3rem;
  outline: none;
}

[ngOption]:hover,
[ngOption][data-active='true'] {
  background-color: color-mix(in srgb, var(--primary-contrast) 5%, transparent);
}

[ngOption][data-active='true'] {
  outline-offset: -2px;
  outline: 2px solid var(--primary);
}

[ngOption][aria-selected='true'] {
  color: var(--primary);
  background-color: color-mix(in srgb, var(--primary) 10%, transparent);
}

[ngOption]:not([aria-selected='true']) .example-option-check {
  display: none;
}

[ngOption][aria-disabled='true'] {
  opacity: 0.6;
  cursor: default;
}

[ngOption][aria-disabled='true']:hover {
  background-color: transparent;
}

.example-option-check {
  font-size: 0.9rem;
}

.example-option-text {
  flex: 1;
}

app.ts

import {Combobox, ComboboxPopup, ComboboxWidget} from '@angular/aria/combobox';
import {Listbox, Option} from '@angular/aria/listbox';
import {OverlayModule} from '@angular/cdk/overlay';
import {afterRenderEffect, Component, computed, signal, viewChild, effect} from '@angular/core';

@Component({
  selector: 'app-root:not([theme="limited-retro"])',
  templateUrl: './app.html',
  styleUrl: './app.css',
  imports: [Combobox, ComboboxPopup, ComboboxWidget, Listbox, Option, OverlayModule],
})
export class App {
  /** The combobox listbox popup. */
  readonly listbox = viewChild(Listbox);

  /** The options available in the listbox. */
  readonly selectedValues = signal<string[]>([]);

  /** The string that is displayed in the combobox. */
  readonly displayValue = computed(() => {
    const values = this.selectedValues();
    if (values.length === 0) {
      return 'Select 2 labels';
    }
    if (values.length === 1) {
      return values[0];
    }
    return `${values[0]} & ${values[1]}`;
  });

  /** The labels that are available for selection. */
  readonly labels = [
    {value: 'Important', disabled: computed(() => this.isOptionDisabled('Important'))},
    {value: 'Starred', disabled: computed(() => this.isOptionDisabled('Starred'))},
    {value: 'Work', disabled: computed(() => this.isOptionDisabled('Work'))},
    {value: 'Personal', disabled: computed(() => this.isOptionDisabled('Personal'))},
    {value: 'To Do', disabled: computed(() => this.isOptionDisabled('To Do'))},
    {value: 'Later', disabled: computed(() => this.isOptionDisabled('Later'))},
    {value: 'Read', disabled: computed(() => this.isOptionDisabled('Read'))},
    {value: 'Travel', disabled: computed(() => this.isOptionDisabled('Travel'))},
  ];

  /** Whether the popup is expanded. */
  readonly popupExpanded = signal(false);

  constructor() {
    // Scrolls to the active item when the active option changes.
    afterRenderEffect(() => {
      this.listbox()?.scrollActiveItemIntoView();
    });
  }

  isOptionDisabled(value: string) {
    const values = this.selectedValues();
    if (!values || values.length < 2) {
      return false;
    }
    return !values.includes(value);
  }
}

app.html

<div
  #combobox="ngCombobox"
  ngCombobox
  [(expanded)]="popupExpanded"
  [preserveContent]="true"
  class="select"
>
  <span class="combobox-label">
    <span class="selected-label-text">{{ displayValue() }}</span>
  </span>
  <span class="example-arrow material-symbols-outlined" translate="no" aria-hidden="true"
    >arrow_drop_down</span
  >
</div>

<ng-template
  [cdkConnectedOverlay]="{origin: combobox.element, usePopover: 'inline', matchWidth: true}"
  [cdkConnectedOverlayOpen]="popupExpanded()"
>
  <ng-template ngComboboxPopup [combobox]="combobox">
    <div class="example-popup-container">
      <div
        #listbox="ngListbox"
        ngListbox
        [multi]="true"
        ngComboboxWidget
        focusMode="activedescendant"
        [tabindex]="-1"
        selectionMode="explicit"
        [(value)]="selectedValues"
        [activeDescendant]="listbox.activeDescendant()"
      >
        @for (label of labels; track label.value) {
          <div ngOption [value]="label.value" [label]="label.value" [disabled]="label.disabled()">
            <span class="example-option-text">{{ label.value }}</span>
            <span
              class="example-option-check material-symbols-outlined"
              translate="no"
              aria-hidden="true"
              >check</span
            >
          </div>
        }
      </div>
    </div>
  </ng-template>
</ng-template>

app.css

@import url('https://fonts.googleapis.com/icon?family=Material+Symbols+Outlined');
@import url('https://fonts.googleapis.com/css2?family=Press+Start+2P&display=swap');

:host {
  display: flex;
  justify-content: center;
  font-size: 0.8rem;

  font-family: 'Press Start 2P';
  --retro-button-color: color-mix(in srgb, var(--hot-pink) 80%, var(--page-background));
  --retro-shadow-light: color-mix(in srgb, var(--retro-button-color) 90%, #fff);
  --retro-shadow-dark: color-mix(in srgb, var(--retro-button-color) 90%, #000);
  --retro-elevated-shadow:
    inset 4px 4px 0px 0px var(--retro-shadow-light),
    inset -4px -4px 0px 0px var(--retro-shadow-dark), 4px 0px 0px 0px var(--tertiary-contrast),
    0px 4px 0px 0px var(--tertiary-contrast), -4px 0px 0px 0px var(--tertiary-contrast),
    0px -4px 0px 0px var(--tertiary-contrast);
  --retro-flat-shadow:
    4px 0px 0px 0px var(--tertiary-contrast), 0px 4px 0px 0px var(--tertiary-contrast),
    -4px 0px 0px 0px var(--tertiary-contrast), 0px -4px 0px 0px var(--tertiary-contrast);
  --retro-clickable-shadow:
    inset 4px 4px 0px 0px var(--retro-shadow-light),
    inset -4px -4px 0px 0px var(--retro-shadow-dark), 4px 0px 0px 0px var(--tertiary-contrast),
    0px 4px 0px 0px var(--tertiary-contrast), -4px 0px 0px 0px var(--tertiary-contrast),
    0px -4px 0px 0px var(--tertiary-contrast), 8px 8px 0px 0px var(--tertiary-contrast);
  --retro-pressed-shadow:
    inset 4px 4px 0px 0px var(--retro-shadow-dark),
    inset -4px -4px 0px 0px var(--retro-shadow-light), 4px 0px 0px 0px var(--tertiary-contrast),
    0px 4px 0px 0px var(--tertiary-contrast), -4px 0px 0px 0px var(--tertiary-contrast),
    0px -4px 0px 0px var(--tertiary-contrast), 0px 0px 0px 0px var(--tertiary-contrast);
}

.select {
  display: flex;
  position: relative;
  align-items: center;
  color: var(--page-background);
  background-color: var(--hot-pink);
  box-shadow: var(--retro-clickable-shadow);
  /* Modernized additions for div-trigger Select: */
  height: 2.5rem;
  padding: 0 4.5rem;
  cursor: pointer;
  box-sizing: border-box;
  width: 22rem;
  user-select: none;
  -webkit-user-select: none;
  outline: none;
}

.select span {
  user-select: none;
  -webkit-user-select: none;
}

.select:hover,
.select:focus,
.select:focus-within {
  transform: translate(1px, 1px);
}

.select:active {
  transform: translate(4px, 4px);
  box-shadow: var(--retro-pressed-shadow);
  background-color: color-mix(in srgb, var(--retro-button-color) 60%, var(--gray-50));
}

.select[aria-disabled='true'] {
  opacity: 0.6;
  cursor: default;
}

.selected-label-icon {
  font-size: 1.25rem;
}

.select[aria-expanded='false']:focus,
.select[aria-expanded='false']:focus-within {
  outline-offset: 8px;
  outline: 4px dashed var(--hot-pink);
}

.combobox-label {
  gap: 1rem;
  left: 1rem;
  display: flex;
  position: absolute;
  align-items: center;
  pointer-events: none;
}

.example-arrow {
  right: 1rem;
  position: absolute;
  pointer-events: none;
  transition: transform 150ms ease-in-out;
}

.select[aria-expanded='true'] .example-arrow {
  transform: rotate(180deg);
}

.example-popup-container {
  width: 100%;
  padding: 0.5rem;
  margin-top: 20px;
  box-shadow: var(--retro-flat-shadow);
  background-color: var(--septenary-contrast);
  max-height: 11rem;
  box-sizing: border-box;
  overflow: hidden;
  animation: smoothPopupOpen 150ms ease-out forwards;
  transform-origin: top;
}

@keyframes smoothPopupOpen {
  0% {
    max-height: 0;
    opacity: 0;
  }
  16.7% {
    opacity: 1;
  }
  100% {
    max-height: 11rem;
    opacity: 1;
  }
}

.example-popup-container.closing {
  animation: smoothPopupClose 150ms ease-in forwards;
}

@keyframes smoothPopupClose {
  0% {
    max-height: 11rem;
    opacity: 1;
  }
  100% {
    max-height: 0;
    opacity: 0;
  }
}

[ngListbox] {
  gap: 2px;
  height: 100%;
  display: flex;
  overflow: auto;
  flex-direction: column;
  outline: none;
}

[ngOption] {
  display: flex;
  cursor: pointer;
  align-items: center;
  padding: 0 1rem;
  font-size: 0.6rem;
  min-height: 2.25rem;
  outline: none;
}

[ngOption]:hover {
  background-color: color-mix(in srgb, var(--primary-contrast) 5%, transparent);
}

[ngOption][data-active='true'] {
  outline-offset: -2px;
  outline: 2px dashed var(--hot-pink);
}

[ngOption][aria-selected='true'] {
  color: var(--hot-pink);
  background-color: color-mix(in srgb, var(--hot-pink) 5%, transparent);
}

.example-option-icon {
  font-size: 1.25rem;
  padding-right: 1rem;
}

[ngOption]:not([aria-selected='true']) .example-option-check {
  display: none;
}

[ngOption][aria-disabled='true'] {
  opacity: 0.6;
  cursor: default;
}

[ngOption][aria-disabled='true']:hover {
  background-color: transparent;
}

.example-option-icon,
.example-option-check {
  font-size: 0.9rem;
}

.example-option-text {
  flex: 1;
}

Bu örnek seçimleri iki öğeyle sınırlar. Sınıra ulaşıldığında, daha fazla seçimi engellemek için seçilmemiş seçenekler devre dışı bırakılır ve combobox gösterimi seçimleri yansıtacak şekilde güncellenir.

Test etme

Çoklu seçim kalıbı, @angular/aria/combobox/testing ve @angular/aria/listbox/testing paketlerindeki ComboboxHarness ve ListboxHarness kombinasyonu kullanılarak test edilebilir. Harness'leri kullanarak bir çoklu seçim bileşenini nasıl test edeceğinize dair bir örnek aşağıdadır:

import {ComponentFixture, TestBed} from '@angular/core/testing';
import {HarnessLoader} from '@angular/cdk/testing';
import {TestbedHarnessEnvironment} from '@angular/cdk/testing/testbed';
import {ComboboxHarness} from '@angular/aria/combobox/testing';
import {ListboxHarness} from '@angular/aria/listbox/testing';
import {MyMultiselectComponent} from './my-multiselect'; // Bileşeniniz

describe('MyMultiselectComponent', () => {
  let fixture: ComponentFixture<MyMultiselectComponent>;
  let loader: HarnessLoader;

  beforeEach(async () => {
    TestBed.configureTestingModule({
      imports: [MyMultiselectComponent],
    });

    fixture = TestBed.createComponent(MyMultiselectComponent);
    await fixture.whenStable();
    loader = TestbedHarnessEnvironment.loader(fixture);
  });

  it('should allow selecting multiple options', async () => {
    const select = await loader.getHarness(ComboboxHarness);

    // Açılır menüyü aç
    await select.open();

    // Açılır pencereden listbox harness'ini al
    const listbox = await select.getPopupWidget(ListboxHarness);
    expect(await listbox.isMulti()).toBe(true);

    const options = await listbox.getOptions();

    // Birinci ve ikinci seçenekleri seç
    await options[0].click();
    await options[1].click();

    // Her iki seçeneğin de seçili olduğunu doğrula
    expect(await options[0].isSelected()).toBe(true);
    expect(await options[1].isSelected()).toBe(true);

    // Açılır menüyü kapat
    await select.close();

    // Değerin güncellendiğini doğrula (ör. virgülle ayrılmış liste veya sayı)
    expect(await (await select.host()).text()).toContain('Option 1, Option 2');
  });
});

API'ler

Çoklu seçim kalıbı, Angular'ın Aria kütüphanesindeki aşağıdaki yönergeleri kullanır. Bağlantılı rehberlerdeki tam API dokümantasyonuna bakın.

Combobox yönergeleri

Çoklu seçim kalıbı, select benzeri bir çoklu seçim açılır menüsü oluşturmak için ngCombobox yönergesini doğrudan tetikleyici öğe (div veya button gibi) üzerinde kullanır.

Girişler

Property	Type	Default	Description
`disabled`	`boolean`	`false`	Tüm çoklu seçimi devre dışı bırakır

Mevcut tüm girişler ve sinyaller hakkında eksiksiz bilgi için Combobox API dokümantasyonuna bakın.

Açılır pencere yönergeleri

Yapısal ngComboboxPopup yönergesi, katman şablonunu işaretler ve ana combobox'a bir referans gerektirir:

Property	Type	Description
`combobox`	`Combobox`	Ana `Combobox`'a zorunlu referans

ComboboxWidget yönergesi

ngComboboxWidget yönergesi, aktif soyundan (active-descendant) odak takibini desteklemek için listbox ile combobox tetikleyicisi arasında köprü kurar.

Property	Type	Description
`activeDescendant`	`string \| undefined`	Tetikleyicideki `aria-activedescendant` niteliğini güncellemek için o anda aktif olan seçeneğin kimliği (`listbox.activeDescendant()` ile bağlanır)

Listbox yönergeleri

Çoklu seçim kalıbı, çoklu seçim için multi niteliği ile ngListbox ve her seçilebilir öğe için ngOption kullanır.

Girişler

Property	Type	Default	Description
`multi`	`boolean`	`false`	Çoklu seçimi etkinleştirmek için `true` olarak ayarlayın
`selectionMode`	`'follow'` \| `'explicit'`	`'follow'`	Seçeneklerin aktif odağı takip etmek yerine tıklama/Boşluk ile açıkça değiştirilmesi için `'explicit'` olarak ayarlayın
`focusMode`	`'roving'` \| `'activedescendant'`	`'roving'`	Listbox tarafından kullanılan odak stratejisi. Tarayıcı odağının combobox tetikleyicisinde kalması için `'activedescendant'` ayarlayın.
`tabIndex`	`number`	`0`	Listbox'ın tabindex'i. Aktif soyundan modunda klavye odağının açılır pencere kapsayıcısına girmesini önlemek için `-1` olarak ayarlayın.

Model

Property	Type	Description
`value`	`ModelSignal<any[]>`	Seçili değerlerin iki yönlü bağlanabilir dizisi

multi true olduğunda, kullanıcılar seçimi değiştirmek için Boşluk kullanarak birden fazla seçenek seçebilir. Açılır pencere seçimden sonra açık kalır ve ek seçimlere izin verir.

Listbox yapılandırması, seçim modları ve seçenek özellikleri hakkında eksiksiz bilgi için Listbox API dokümantasyonuna bakın.

Konumlandırma

Çoklu seçim kalıbı, akıllı konumlandırma için CDK Overlay ile entegre olur. Görünüm alanı kenarlarını ve kaydırmayı otomatik olarak yönetmek için cdkConnectedOverlay kullanın.