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* Copyright (c) Siemens 2016 - 2025
* SPDX-License-Identifier: MIT
*/
import { ActiveDescendantKeyManager } from '@angular/cdk/a11y';
import {
ChangeDetectorRef,
DestroyRef,
Directive,
inject,
input,
OnInit,
output,
contentChildren,
INJECTOR,
effect
} from '@angular/core';
import { SiAutocompleteOptionDirective } from './si-autocomplete-option.directive';
import { SiAutocompleteDirective } from './si-autocomplete.directive';
import { AUTOCOMPLETE_LISTBOX } from './si-autocomplete.model';
@Directive({
selector: '[siAutocompleteListboxFor]',
providers: [{ provide: AUTOCOMPLETE_LISTBOX, useExisting: SiAutocompleteListboxDirective }],
host: {
role: 'listbox',
'[id]': 'id()'
},
exportAs: 'siAutocompleteListbox'
})
export class SiAutocompleteListboxDirective<T> implements OnInit {
private static idCounter = 0;
private readonly options = contentChildren(SiAutocompleteOptionDirective, { descendants: true });
/**
* @defaultValue
* ```
* `__si-autocomplete-listbox-${SiAutocompleteListboxDirective.idCounter++}`
* ```
*/
readonly id = input(`__si-autocomplete-listbox-${SiAutocompleteListboxDirective.idCounter++}`);
readonly autocomplete = input.required<SiAutocompleteDirective<T>>({
alias: 'siAutocompleteListboxFor'
});
/** @defaultValue 0 */
readonly siAutocompleteDefaultIndex = input(0);
readonly siAutocompleteOptionSubmitted = output<T | undefined>();
private injector = inject(INJECTOR);
private keyManager = new ActiveDescendantKeyManager(this.options, this.injector)
.withWrap(true)
.withVerticalOrientation(true);
private changeDetectorRef = inject(ChangeDetectorRef);
private destroyRef = inject(DestroyRef);
constructor() {
effect(() => {
if (this.siAutocompleteDefaultIndex() >= 0 && !this.keyManager.activeItem) {
this.setActiveItem();
}
});
effect(() => {
if (this.options()) {
this.setActiveItem();
}
});
}
ngOnInit(): void {
// For some reason, this is needed sometimes. Otherwise, one may get ExpressionChangedAfterItHasBeenCheckedError.
queueMicrotask(() => {
this.changeDetectorRef.markForCheck();
this.autocomplete().listbox = this;
});
this.destroyRef.onDestroy(() => {
this.autocomplete().listbox = undefined;
});
}
private setActiveItem(): void {
queueMicrotask(() => {
this.keyManager.setActiveItem(this.siAutocompleteDefaultIndex());
this.changeDetectorRef.markForCheck();
});
}
/** @internal */
onKeydown(event: KeyboardEvent): void {
Iif (event.ctrlKey && event.key === 'Enter') {
// [ctrl + enter] should submit and not select an option.
// Mainly needed for filtered-search.
return;
}
this.keyManager!.onKeydown(event);
if (event.key === 'Enter' && this.keyManager!.activeItem) {
this.siAutocompleteOptionSubmitted.emit(this.keyManager!.activeItem.value());
// Something was selected. This should prevent everything else from happening, especially submitting the form.
event.stopImmediatePropagation();
}
this.changeDetectorRef.markForCheck();
}
get active(): SiAutocompleteOptionDirective<T> | null {
// NOTE: We must not return `this.keyManager.activeItem` here, because its not updating
// activeItem reference when options change.
Iif (this.keyManager.activeItemIndex === null) {
return null;
}
return this.options().at(this.keyManager.activeItemIndex) ?? null;
}
}
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