53 lines
1.6 KiB
TypeScript
53 lines
1.6 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 {Directive, EmbeddedViewRef, Input, OnChanges, TemplateRef, ViewContainerRef} from '@angular/core';
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/**
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* Creates and inserts an embedded view based on a prepared `TemplateRef`.
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* You can attach a context object to the `EmbeddedViewRef` by setting `[ngOutletContext]`.
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* `[ngOutletContext]` should be an object, the object's keys will be the local template variables
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* available within the `TemplateRef`.
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*
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* Note: using the key `$implicit` in the context object will set it's value as default.
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*
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* ### Syntax
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*
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* ```
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* <template [ngTemplateOutlet]="templateRefExpression"
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* [ngOutletContext]="objectExpression">
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* </template>
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* ```
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*
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* @experimental
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*/
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@Directive({selector: '[ngTemplateOutlet]'})
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export class NgTemplateOutlet implements OnChanges {
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private _viewRef: EmbeddedViewRef<any>;
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private _context: Object;
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private _templateRef: TemplateRef<any>;
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constructor(private _viewContainerRef: ViewContainerRef) {}
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@Input()
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set ngOutletContext(context: Object) { this._context = context; }
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@Input()
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set ngTemplateOutlet(templateRef: TemplateRef<Object>) { this._templateRef = templateRef; }
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ngOnChanges() {
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if (this._viewRef) {
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this._viewContainerRef.remove(this._viewContainerRef.indexOf(this._viewRef));
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}
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if (this._templateRef) {
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this._viewRef = this._viewContainerRef.createEmbeddedView(this._templateRef, this._context);
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}
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}
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}
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