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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 | 1x 1x 151x 151x 151x 151x 151x 151x 151x 151x 151x 151x 288x 93x 151x 187x 187x 151x 151x 151x 151x 151x 280x 280x 280x 148x 148x 148x 6x 6x 148x 261x 261x | /** * 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; } } |