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Angular 2 Wikipedia Image Search
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| SystemJS.config({ | |
| transpiler: "typescript", | |
| typescriptOptions: { | |
| "experimentalDecorators": true, | |
| "emitDecoratorMetadata": true | |
| }, | |
| map: { | |
| "rxjs": "https://npmcdn.com/[email protected]", | |
| "angular2": "https://npmcdn.com/[email protected]", | |
| "typescript": "https://npmcdn.com/[email protected]/lib/typescript.js" | |
| }, | |
| packages: { | |
| "rxjs": { "defaultExtension": "js" }, | |
| "angular2": { "defaultExtension": "js" }, | |
| "@ngrx/store":{ | |
| "main":"dist/index.js" | |
| }, | |
| "src": { "defaultExtension": "ts" }, | |
| "build": { "defaultExtension": "ts" } | |
| } | |
| }); |
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <title>Angular 2 App</title> | |
| <script src="https://npmcdn.com/angular2/bundles/angular2-polyfills.js"></script> | |
| <script src="https://npmcdn.com/systemjs/dist/system.js"></script> | |
| <link rel="stylesheet" type="text/css" href="style.css"> | |
| </head> | |
| <body> | |
| <app></app> | |
| <script src="config.js"></script> | |
| <script>System.import('src/main');</script> | |
| </body> | |
| </html> |
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| import {Component} from 'angular2/core'; | |
| import 'rxjs/add/operator/map'; | |
| import 'rxjs/add/operator/do'; | |
| import 'rxjs/add/operator/concatAll'; | |
| import 'rxjs/add/operator/mergeMap'; | |
| import 'rxjs/add/operator/scan'; | |
| import 'rxjs/add/operator/filter'; | |
| import 'rxjs/add/operator/debounceTime'; | |
| import 'rxjs/add/operator/reduce'; | |
| import 'rxjs/add/operator/startWith'; | |
| import 'rxjs/add/operator/share'; | |
| import 'rxjs/add/operator/distinctUntilChanged'; | |
| import 'rxjs/add/operator/combineLatest'; | |
| import 'rxjs/add/operator/withLatestFrom'; | |
| import 'rxjs/add/operator/switchMap'; | |
| import 'rxjs/add/operator/concat'; | |
| import 'rxjs/add/operator/takeUntil'; | |
| import 'rxjs/add/operator/race'; | |
| import 'rxjs/add/operator/mapTo'; | |
| import 'rxjs/add/observable/bindCallback'; | |
| import 'rxjs/add/observable/merge'; | |
| import {JSONP_PROVIDERS, HTTP_PROVIDERS, Http, Jsonp} from 'angular2/http'; | |
| import {Subject} from 'rxjs/Subject'; | |
| import {BehaviorSubject} from 'rxjs/BehaviorSubject'; | |
| import {WikipediaService} from './services/wikipedia.service'; | |
| import {Observable} from 'rxjs/Observable'; | |
| @Component({ | |
| selector: 'app', | |
| providers: [HTTP_PROVIDERS, JSONP_PROVIDERS, WikipediaService] | |
| template: ` | |
| <style> | |
| .container{ | |
| width: 350px; | |
| } | |
| img{ | |
| width: 90px; | |
| border: 5px solid black; | |
| } | |
| img:hover { | |
| width: 90px; | |
| border: 5px solid gray; | |
| } | |
| </style> | |
| <div> | |
| <h2>Search: {{(searchTerm$ | async)}}</h2> | |
| <input type="text" (input)="input$.next($event)"> | |
| <h3>{{imageCount$ | async}} results</h3> | |
| <div class="container"> | |
| <a *ngFor="#image of images$ | async" [href]="image.descriptionurl"> | |
| <img [src]="image.url" alt=""> | |
| </a> | |
| </div> | |
| </div> | |
| ` | |
| }) | |
| export class App { | |
| input$ = new Subject().map(event => event.target.value); | |
| searchTerm$; | |
| images$; | |
| imageCount$; | |
| constructor(wikipediaService:WikipediaService) { | |
| this.searchTerm$ = this.input$ | |
| .distinctUntilChanged() | |
| .debounceTime(500) | |
| .filter(term => term.length > 0) | |
| .share(); | |
| this.images$ = this.searchTerm$ | |
| .switchMap(term=> wikipediaService.searchAllImages(term) | |
| .map(wikipediaService.mapAllImagesToTitles) | |
| .concatAll() | |
| .mergeMap(wikipediaService.getImageInfoFromTitle) | |
| .map(wikipediaService.mapImageInfoToUrls) | |
| .scan((acc, curr)=> [...acc, ...curr]) | |
| ) | |
| .startWith([]) | |
| .share() | |
| this.imageCount$ = this.images$ | |
| .map(results => results.length) | |
| } | |
| } |
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| import {enableProdMode} from 'angular2/core'; | |
| import {bootstrap} from 'angular2/platform/browser'; | |
| import {App} from './app'; | |
| enableProdMode(); | |
| bootstrap(App) | |
| .catch(console.log.bind(console)); | |
| console.clear(); | |
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| import {Injectable} from 'angular2/core'; | |
| import {Jsonp} from 'angular2/http'; | |
| const CALLBACK = 'callback=JSONP_CALLBACK'; | |
| const WIKIPEDIA = 'https://en.wikipedia.org/w/api.php'; | |
| const QUERY = 'action=query'; | |
| const JSON = 'format=json'; | |
| const ALLIMAGES = 'list=allimages'; | |
| const IMAGEINFO = 'prop=imageinfo'; | |
| const API = `${WIKIPEDIA}?${QUERY}&${JSON}&${CALLBACK}&${ALLIMAGES}`; | |
| const PROP_URL = 'iiprop=url'; | |
| @Injectable() | |
| export class WikipediaService{ | |
| constructor(private _jsonp:Jsonp){} | |
| searchAllImages = term => this._jsonp.get(`${API}&${ALLIMAGES}&aifrom=${term}`) | |
| .map(res => res.json()); | |
| mapAllImagesToTitles = allImages => allImages.query.allimages.map(({title}) => title); | |
| getImageInfoFromTitle= title => this._jsonp.get(`${API}&${IMAGEINFO}&${PROP_URL}&titles=${title}`) | |
| .map(res => res.json()); | |
| mapImageInfoToUrls = body => Object.keys(body.query.pages) | |
| .filter(page => page > 0) //page -1 means no images | |
| .map(page =>{ | |
| return body.query.pages[page].imageinfo[0]; | |
| }); | |
| } |
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| /* Styles go here */ | |
| body{ | |
| font-family: sans-serif; | |
| } |
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