29 lines
640 B
TypeScript
29 lines
640 B
TypeScript
// #docregion
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import {Pipe, PipeTransform} from 'angular2/core';
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import {Http} from 'angular2/http';
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// #docregion pipe-metadata
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@Pipe({
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name: 'fetch',
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pure: false
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})
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// #enddocregion pipe-metadata
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export class FetchJsonPipe implements PipeTransform{
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private fetched:any = null;
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private prevUrl = '';
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constructor(private _http: Http) { }
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transform(url:string):any {
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if (url !== this.prevUrl) {
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this.prevUrl = url;
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this.fetched = null;
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this._http.get(url)
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.map( result => result.json() )
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.subscribe( result => this.fetched = result )
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}
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return this.fetched;
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}
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}
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