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* Copyright (c) Siemens 2016 - 2025
* SPDX-License-Identifier: MIT
*/
import { CdkOverlayOrigin, OverlayModule } from '@angular/cdk/overlay';
import {
AfterContentInit,
booleanAttribute,
ChangeDetectionStrategy,
Component,
computed,
contentChild,
ElementRef,
inject,
input,
OnChanges,
output,
signal,
SimpleChanges,
TemplateRef,
viewChild
} from '@angular/core';
import { SI_FORM_ITEM_CONTROL, SiFormItemControl } from '@siemens/element-ng/form';
import { t, TranslatableString } from '@siemens/element-translate-ng/translate';
import { SiSelectComplexOptionsDirective } from './options/si-select-complex-options.directive';
import { SI_SELECT_OPTIONS_STRATEGY } from './options/si-select-options-strategy';
import { SiSelectInputComponent } from './select-input/si-select-input.component';
import { SiSelectListHasFilterComponent } from './select-list/si-select-list-has-filter.component';
import { SiSelectListComponent } from './select-list/si-select-list.component';
import { SiSelectSelectionStrategy } from './selection/si-select-selection-strategy';
import { SiSelectActionsDirective } from './si-select-actions.directive';
import { SiSelectGroupTemplateDirective } from './si-select-group-template.directive';
import { SiSelectOptionTemplateDirective } from './si-select-option-template.directive';
import { SelectGroup, SelectItem, SelectOption } from './si-select.types';
@Component({
selector: 'si-select',
imports: [
OverlayModule,
SiSelectInputComponent,
SiSelectListComponent,
SiSelectListHasFilterComponent
],
templateUrl: './si-select.component.html',
styleUrl: './si-select.component.scss',
providers: [{ provide: SI_FORM_ITEM_CONTROL, useExisting: SiSelectComponent }],
changeDetection: ChangeDetectionStrategy.OnPush,
host: {
class: 'dropdown',
'[class.readonly]': 'readonly()',
'[class.open]': 'isOpen()',
'[class.si-select-has-filter]': 'hasFilter()'
}
})
export class SiSelectComponent<T> implements OnChanges, AfterContentInit, SiFormItemControl {
private static idCounter = 0;
/**
* Unique identifier.
*
* @defaultValue
* ```
* `__si-select-${SiSelectComponent.idCounter++}`
* ```
*/
readonly id = input(`__si-select-${SiSelectComponent.idCounter++}`);
/**
* Aria label of the select.
*
* @defaultValue null
*/
readonly ariaLabel = input<string | null>(null);
/**
* Aria labelledby of the select.
* @defaultValue undefined
*/
// eslint-disable-next-line @angular-eslint/no-input-rename
readonly labelledbyInput = input<string | undefined>(undefined, { alias: 'labelledby' });
/**
* Placeholder for search input field.
*
* @defaultValue
* ```
* t(() => $localize`:@@SI_SELECT.SEARCH-PLACEHOLDER:Search...`)
* ```
*/
readonly filterPlaceholder = input(t(() => $localize`:@@SI_SELECT.SEARCH-PLACEHOLDER:Search...`));
/**
* Label if no item can be found.
*
* @defaultValue
* ```
* t(() => $localize`:@@SI_SELECT.NO-RESULTS-FOUND:No results found`)
* ```
*/
readonly noResultsFoundLabel = input(
t(() => $localize`:@@SI_SELECT.NO-RESULTS-FOUND:No results found`)
);
/** Placeholder text to display when no options are selected. */
readonly placeholder = input<TranslatableString>();
/**
* Readonly state. Similar to disabled but with higher contrast *
*
* @defaultValue false
*/
readonly readonly = input(false, { transform: booleanAttribute });
/**
* Emits on selection dropdown close.
* @deprecated Use {@link openChange} instead.
*/
readonly dropdownClose = output<void>();
/** Emits when the dropdown open state changes. */
readonly openChange = output<boolean>();
protected readonly isOpen = signal(false);
protected readonly optionTemplate = contentChild<
SiSelectOptionTemplateDirective,
TemplateRef<{ $implicit: SelectOption<T> }>
>(SiSelectOptionTemplateDirective, { read: TemplateRef });
protected readonly groupTemplate = contentChild<
SiSelectGroupTemplateDirective,
TemplateRef<{ $implicit: SelectGroup<T> }>
>(SiSelectGroupTemplateDirective, { read: TemplateRef });
protected readonly actionsTemplate = contentChild<SiSelectActionsDirective, TemplateRef<any>>(
SiSelectActionsDirective,
{ read: TemplateRef }
);
private readonly trigger = viewChild.required<CdkOverlayOrigin, ElementRef<HTMLDivElement>>(
CdkOverlayOrigin,
{
read: ElementRef
}
);
/** @internal */
readonly labelledby = computed(() => this.labelledbyInput() ?? this.id() + '-label');
/**
* This ID will be bound to the `aria-describedby` attribute of the select.
* Use this to reference the element containing the error message(s) for the select.
* It will be picked by the {@link SiFormItemComponent} if the select is used inside a form item.
*
* @defaultValue
* ```
* `${this.id()}-errormessage`
* ```
*/
readonly errormessageId = input(`${this.id()}-errormessage`);
protected rows: readonly SelectItem<T>[] = [];
protected overlayWidth = 0;
protected readonly selectionStrategy = inject(SiSelectSelectionStrategy<T>);
private backdropClicked = false;
private readonly selectOptions = inject(SI_SELECT_OPTIONS_STRATEGY);
/**
* Enables the filter input
* @defaultValue false
* @defaultref {@link SiSelectComponent#_hasFilter}
*/
readonly hasFilter = input(false, { transform: booleanAttribute });
ngOnChanges(changes: SimpleChanges): void {
if (changes.hasFilter && this.hasFilter()) {
this.verifyValueProvider();
}
}
ngAfterContentInit(): void {
this.verifyValueProvider();
}
/** Opens the `si-select`. */
open(): void {
if (this.readonly() || this.selectionStrategy.disabled()) {
return;
}
this.overlayWidth = this.trigger().nativeElement.getBoundingClientRect().width + 2; // 2px border
this.isOpen.set(true);
this.openChange.emit(true);
}
/** Closes the `si-select`. */
close(): void {
this.isOpen.set(false);
if (!this.backdropClicked) {
this.trigger().nativeElement.focus();
} else E{
this.backdropClicked = false;
this.selectionStrategy.onTouched();
}
this.dropdownClose.emit();
this.openChange.emit(false);
}
protected backdropClick(): void {
this.backdropClicked = true;
this.isOpen.set(false);
}
private verifyValueProvider(): void {
if (
this.hasFilter() &&
this.optionTemplate() &&
this.selectOptions instanceof SiSelectComplexOptionsDirective &&
!this.selectOptions.valueProvider()
) {
console.error(
'A valueProvider is required when [hasFilter]="true" and having custom option template on si-select'
);
}
}
}
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