Angular2:如何操纵url查询字符串？

Question

在角度1中,有一个$location.search()可以操纵URL查询字符串的函数.angular2等价物是多少？

我试过了

import {Location} from 'angular2/angular2';

和

import {URLSearchParams} from 'angular2/angular2';

没有运气.

Answer 1

简答(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中找到.你会注意到searchparam是一种类型URLSearchParams

另一个例子是Angular2指南(不介意JSONP的东西,它通常是如何使用查询参数的普通http请求).

参考以不同的方式解释它: 如何在Angular 2中使用URLSearchParams

此外,如果您没有在您的可观察功能中导入RxJSapp.ts将会中断.

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');
    }

}