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* Copyright (c) Siemens 2016 - 2025
* SPDX-License-Identifier: MIT
*/
import {
booleanAttribute,
ChangeDetectionStrategy,
ChangeDetectorRef,
Component,
computed,
ElementRef,
HostListener,
inject,
input,
OnInit,
signal,
viewChild
} from '@angular/core';
import { ControlValueAccessor, NG_VALUE_ACCESSOR } from '@angular/forms';
import { SI_FORM_ITEM_CONTROL, SiFormItemControl } from '@siemens/element-ng/form';
import { SiTranslatePipe, t } from '@siemens/element-translate-ng/translate';
import { SiInputPillComponent } from './si-input-pill.component';
import {
SiPillsInputValueHandlerDirective,
SiPillsInputValueHandlerTrigger
} from './si-pills-input-value-handler';
@Component({
selector: 'si-pills-input',
imports: [SiInputPillComponent, SiTranslatePipe],
templateUrl: './si-pills-input.component.html',
styleUrl: './si-pills-input.component.scss',
providers: [
{
provide: NG_VALUE_ACCESSOR,
useExisting: SiPillsInputComponent,
multi: true
},
{
provide: SI_FORM_ITEM_CONTROL,
useExisting: SiPillsInputComponent
}
],
changeDetection: ChangeDetectionStrategy.OnPush,
host: {
class: 'form-control',
role: 'listbox',
'aria-orientation': 'horizontal',
'[class.disabled]': 'disabled()',
'[attr.aria-disabled]': 'disabled()',
'[class.readonly]': 'readonly()',
'[attr.aria-readonly]': 'readonly()',
// using attr so that tabindex is removed if not defined
'[attr.tabindex]': 'tabindex()',
'[attr.aria-activedescendant]': 'activeDescendant()',
'[attr.aria-labelledby]': 'labelledby()',
'[attr.aria-describedby]': 'errormessageId()'
}
})
export class SiPillsInputComponent implements OnInit, ControlValueAccessor, SiFormItemControl {
private static idCounter = 0;
/**
* The identifier of the pills-input. Will be generated if not provided.
*
* @defaultValue
* ```
* `__si-pills-input-${SiPillsInputComponent.idCounter++}`
* ```
*/
readonly id = input(`__si-pills-input-${SiPillsInputComponent.idCounter++}`);
/**
* The aria-label for the inner input where users enter new items.
*
* @defaultValue
* ```
* t(() => $localize`:@@SI_PILLS_INPUT.INPUT_ELEMENT_ARIA_LABEL:Create item`)
* ```
*/
readonly inputElementAriaLabel = input(
t(() => $localize`:@@SI_PILLS_INPUT.INPUT_ELEMENT_ARIA_LABEL:Create item`)
);
/**
* Whether the pills-input is disabled.
*
* @defaultValue false
*/
// eslint-disable-next-line @angular-eslint/no-input-rename
readonly disabledInput = input(false, { alias: 'disabled', transform: booleanAttribute });
/**
* Whether the pills-input is readonly
*
* @defaultValue false
*/
readonly readonly = input(false, { transform: booleanAttribute });
/** The placeholder to be shown if no value is currently present. */
readonly placeholder = input<string>();
/**
* @defaultValue
* ```
* `${this.id()}-label`
* ```
*/
readonly labelledby = input(`${this.id()}-label`);
/**
* This ID will be bound to the `aria-describedby` attribute of the pills-input.
* Use this to reference the element containing the error message(s) for the pills-input.
* It will be picked by the {@link SiFormItemComponent} if the pills-input is used inside a form item.
*
* @defaultValue
* ```
* `${this.id()}-errormessage`
* ```
*/
readonly errormessageId = input(`${this.id()}-errormessage`);
protected inputValue = '';
protected onTouched: () => void = () => {};
protected onChange: (val: any) => void = () => {};
protected readonly pills = signal<string[]>([]);
protected readonly activePillIndex = signal<number | undefined>(undefined);
protected readonly inputId = computed(() => `${this.id()}-input`);
protected readonly disabled = computed(() => this.disabledInput() || this.disabledNgControl());
protected readonly activeDescendant = computed(() => {
const activePillIndex = this.activePillIndex();
return activePillIndex !== undefined ? `${this.id()}-pill-${activePillIndex}` : null;
});
protected readonly tabindex = computed(() =>
this.disabled() ? undefined : this.readonly() ? 0 : -1
);
private readonly inputElement = viewChild<ElementRef<HTMLInputElement>>('inputElement');
private readonly disabledNgControl = signal(false);
private siPillsInputValueHandlerDirective = inject(SiPillsInputValueHandlerDirective, {
optional: true
});
private readonly cdRef = inject(ChangeDetectorRef);
private readonly elementRef = inject<ElementRef<HTMLElement>>(ElementRef);
ngOnInit(): void {
this.siPillsInputValueHandlerDirective ??= {
handle: (value, trigger) => {
if (trigger !== 'input') {
return {
newPills: [value],
newValue: ''
};
}
return undefined;
}
};
}
protected input(): void {
this.inputValue = this.inputElement()!.nativeElement.value;
this.rebuildValue(this.inputValue, 'input');
}
@HostListener('click')
protected click(): void {
this.inputElement()?.nativeElement.focus();
}
protected blur(): void {
this.rebuildValue(this.inputValue, 'blur');
this.activePillIndex.set(undefined);
this.onTouched();
}
protected keydownEnter(event: Event): void {
this.rebuildValue(this.inputValue, 'keydown.enter');
event.preventDefault();
}
protected keydownBackspace(event: Event): void {
const count = this.pills().length;
if (!this.inputValue && count) {
const lastChipValue = this.pills().at(-1)!;
this.remove(count - 1, false);
this.inputValue = lastChipValue;
event.preventDefault();
}
}
protected remove(index: number, focus = true): void {
this.pills.update(pills => pills.filter((_, pillIndex) => index !== pillIndex));
this.onTouched();
this.onChange(this.pills());
if (focus) {
this.inputElement()!.nativeElement.focus();
}
}
private rebuildValue(value: string, trigger: SiPillsInputValueHandlerTrigger): void {
if (value) {
const valueParseResult = this.siPillsInputValueHandlerDirective?.handle(value, trigger);
if (valueParseResult) {
this.pills.update(pills => [...pills, ...valueParseResult.newPills]);
// Doesn't update when setting to empty string.
// Not using setTimeout to avoid flickering.
this.cdRef.detectChanges();
this.inputValue = valueParseResult.newValue;
this.cdRef.detectChanges();
if (valueParseResult.newPills.length) {
this.onTouched();
this.onChange(this.pills());
}
}
}
}
@HostListener('keydown.arrowLeft') protected arrowLeft(): void {
const activePillIndex = this.activePillIndex();
const count = this.pills().length;
Iif (activePillIndex !== undefined) {
this.activePillIndex.set(Math.max(0, activePillIndex - 1));
} else if (!this.inputValue.length && count) {
this.elementRef.nativeElement.focus();
this.activePillIndex.set(count - 1);
}
}
@HostListener('keydown.arrowRight') protected arrowRight(): void {
const activePillIndex = this.activePillIndex();
Iif (activePillIndex !== undefined) {
this.activePillIndex.set(activePillIndex + 1);
Iif (this.activePillIndex()! >= this.pills().length) {
this.inputElement()?.nativeElement.focus();
this.activePillIndex.set(undefined);
}
}
}
@HostListener('keydown.backspace')
@HostListener('keydown.delete')
protected delete(): void {
const activePillIndex = this.activePillIndex();
const count = this.pills().length;
if (activePillIndex !== undefined && !this.readonly()) {
const targetIndex = count > 1 ? Math.min(activePillIndex, count - 2) : undefined;
this.remove(activePillIndex, targetIndex === undefined);
this.activePillIndex.set(targetIndex);
}
}
/** @internal */
registerOnChange(fn: any): void {
this.onChange = fn;
}
/** @internal */
registerOnTouched(fn: () => void): void {
this.onTouched = fn;
}
/** @internal */
setDisabledState(isDisabled: boolean): void {
this.disabledNgControl.set(isDisabled);
}
/** @internal */
writeValue(value?: string[] | null): void {
this.pills.set(value?.slice() ?? []);
}
}
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