Angular 2 : how to manipulate url query string?

Question

在 Angular 1 中有一个 $location.search() 函数可以操作 URL 查询字符串。什么是 angular2 等价物？

我试过了

import {Location} from 'angular2/angular2';

和

import {URLSearchParams} from 'angular2/angular2';

没有运气。

Answer 1

简短回答(在 TypeScript 中):

// Import you were looking for
import {Http, Response, Headers, RequestOptions, URLSearchParams} from 'angular2/http';
//... jump down some code
export class MyRegistrationsComponent {
    constructor(private http: Http) { }

    getDudesAndDudettes() {
        let headers = new Headers({ 'Content-Type': 'application/json' });
        let options = new RequestOptions({
            headers: headers,
            // Have to make a URLSearchParams with a query string
            search: new URLSearchParams('firstName=John&lastName=Smith}')
        });

        return this.http.get('http://localhost:3000/MyEventsAPI', options)
            .map(res => <Dudes[]>res.json().data)
  }

文档可以在 Angular2 API Docs for RequestOptions 找到.您会注意到 search 参数是 URLSearchParams 的一种类型

另一个例子在 Angular2 Guides (不要介意 JSONP 的东西，它通常也是如何使用普通 http 请求的查询参数)。

以不同方式解释它的引用:How to utilise URLSearchParams in Angular 2

此外，如果您没有导入 RxJS在您的 app.ts 中，可观察到的功能将会中断。

更完整的 TypeScript 示例:

import {Component}      from 'angular2/core';
import {Http, Response, Headers, RequestOptions, URLSearchParams} from 'angular2/http';
import {Registrant}     from './registrant';
import {Registration}   from './registration';
import {Observable}     from 'rxjs/Observable';

@Component({
    selector: 'my-registrations',
    templateUrl: 'app/my-registrations.component.html',
    inputs: ['registrant']
})

export class MyRegistrationsComponent {
    constructor(private http: Http) { }

    private _registrantionsUrl: string = 'http://localhost:3000/MyEventsAPI';
    private _title = 'My Registrations Search';
    public registrant: Registrant = { firstName: "John", lastName: "Smith" };

    findMyEvents() {
        let body = JSON.stringify(this.registrant);
        let headers = new Headers({ 'Content-Type': 'application/json' });
        let options = new RequestOptions({
            headers: headers,
            search: new URLSearchParams(`firstName=${this.registrant.firstName}&lastName=${this.registrant.lastName}`)
        });

        return this.http.get(this._registrantionsUrl, options)
            .toPromise()
            .then(res => <Registration[]>res.json().data)
            .catch(this.handleError);
    }

    private handleError(error: Response) {
        console.error(error);
        return Observable.throw(error.json().error || 'Server error');
    }

}