55 lines
1.4 KiB
TypeScript
55 lines
1.4 KiB
TypeScript
/**
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* @license
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* Copyright Google Inc. All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.io/license
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*/
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import {DebugElement, Predicate, Type} from '@angular/core';
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import {getDOM} from '../../dom/dom_adapter';
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/**
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* Predicates for use with {@link DebugElement}'s query functions.
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*
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* @experimental All debugging apis are currently experimental.
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*/
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export class By {
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/**
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* Match all elements.
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*
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* ## Example
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*
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* {@example platform-browser/dom/debug/ts/by/by.ts region='by_all'}
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*/
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static all(): Predicate<DebugElement> { return (debugElement) => true; }
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/**
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* Match elements by the given CSS selector.
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*
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* ## Example
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*
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* {@example platform-browser/dom/debug/ts/by/by.ts region='by_css'}
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*/
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static css(selector: string): Predicate<DebugElement> {
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return (debugElement) => {
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return debugElement.nativeElement != null ?
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getDOM().elementMatches(debugElement.nativeElement, selector) :
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false;
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};
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}
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/**
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* Match elements that have the given directive present.
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*
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* ## Example
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*
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* {@example platform-browser/dom/debug/ts/by/by.ts region='by_directive'}
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*/
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static directive(type: Type<any>): Predicate<DebugElement> {
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return (debugElement) => debugElement.providerTokens.indexOf(type) !== -1;
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}
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}
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