Angular2：如何操作 url 查询字符串？

在角 1 中，有一个$location.search()可以操作 URL 查询字符串的函数。 Angular2 等价于什么？

I tried

import {Location} from 'angular2/angular2';

and

import {URLSearchParams} from 'angular2/angular2';

没有运气。

简短回答（TypeScript）：

// 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)
  }

这些文档可以在以下位置找到：RequestOptions 的 Angular2 API 文档 https://angular.io/docs/ts/latest/api/http/index/RequestOptions-class.html。您会注意到search参数是一种类型URLSearchParams https://angular.io/docs/js/latest/api/http/URLSearchParams-class.html

另一个例子是在Angular2 指南 https://angular.io/docs/ts/latest/guide/server-communication.html#!#search-parameters（不要介意 JSONP 的东西，它通常也是如何对正常的 http 请求使用查询参数）。

参考以不同的方式解释它：如何在 Angular 2 中使用 URLSearchParams https://stackoverflow.com/questions/34386367/how-to-utilise-urlsearchparams-in-angular-2/34413223#34413223

另外，如果你没有导入RxJS https://angular.io/docs/ts/latest/guide/server-communication.html#!#rxjs在你的app.ts可观察到的功能将会被破坏。

TypeScript 中更完整的示例：

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');
    }

}