angular2/es6/prod/src/platform/dom/debug/by.js

Angular 2 - a web framework for modern web apps

import { isPresent } from 'angular2/src/facade/lang';
import { DOM } from 'angular2/src/platform/dom/dom_adapter';
/**
 * Predicates for use with {@link DebugElement}'s query functions.
 */
export class By {
    /**
     * Match all elements.
     *
     * ## Example
     *
     * {@example platform/dom/debug/ts/by/by.ts region='by_all'}
     */
    static all() { return (debugElement) => true; }
    /**
     * Match elements by the given CSS selector.
     *
     * ## Example
     *
     * {@example platform/dom/debug/ts/by/by.ts region='by_css'}
     */
    static css(selector) {
        return (debugElement) => {
            return isPresent(debugElement.nativeElement) ?
                DOM.elementMatches(debugElement.nativeElement, selector) :
                false;
        };
    }
    /**
     * Match elements that have the given directive present.
     *
     * ## Example
     *
     * {@example platform/dom/debug/ts/by/by.ts region='by_directive'}
     */
    static directive(type) {
        return (debugElement) => { return debugElement.providerTokens.indexOf(type) !== -1; };
    }
}