33 lines
854 B
JavaScript
33 lines
854 B
JavaScript
import {Viewport} from 'angular2/src/core/annotations/annotations';
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import {ViewContainer} from 'angular2/src/core/compiler/view_container';
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import {isBlank} from 'angular2/src/facade/lang';
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/**
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* @publicModule angular2/directives
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*/
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@Viewport({
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selector: '[if]',
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bind: {
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'condition': 'if'
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}
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})
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export class If {
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viewContainer: ViewContainer;
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prevCondition: boolean;
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constructor(viewContainer: ViewContainer) {
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this.viewContainer = viewContainer;
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this.prevCondition = null;
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}
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set condition(newCondition) {
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if (newCondition && (isBlank(this.prevCondition) || !this.prevCondition)) {
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this.prevCondition = true;
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this.viewContainer.create();
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} else if (!newCondition && (isBlank(this.prevCondition) || this.prevCondition)) {
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this.prevCondition = false;
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this.viewContainer.clear();
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}
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}
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}
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