我正在尝试将以下Angular 1代码转换为Angular 2:
$http.jsonp('https://accounts.google.com/logout');
它需要是一个JSONP请求来跳过CORS策略问题。
在最新版本的Angular中
-
在应用程序模块的定义文件中导入HttpClientModule和HttpClientJsonpModule
import { HttpClientModule, HttpClientJsonpModule } from '@angular/common/http'; @NgModule({ declarations: [ //... List of components that you need. ], imports: [ HttpClientModule, HttpClientJsonpModule, //... ], providers: [ //... ], bootstrap: [AppComponent] })
-
将http和maprxjs操作符注入您的服务:
import {Injectable} from '@angular/core'; import {HttpClient} from '@angular/http'; import 'rxjs/add/operator/map'; @Injectable() export class MegaSuperService { constructor(private _http: HttpClient) {} }
-
通过以下方式发出JSONP请求:
// inside your service this._http.jsonp('/api/get', 'callback').map(data => { // Do stuff. });
在Angular版本2-版本4.3中
-
在应用程序模块的定义文件中导入JSONP模块:
import {JsonpModule} from '@angular/http'; @NgModule({ declarations: [ //... List of components that you need. ], imports: [ JsonpModule, //... ], providers: [ //... ], bootstrap: [AppComponent] })
-
将jsonp服务和maprxjs操作符注入您的服务:
import {Injectable} from '@angular/core'; import {Jsonp} from '@angular/http'; import 'rxjs/add/operator/map'; @Injectable() export class MegaSuperService { constructor(private _jsonp: Jsonp) {} }
-
使用";JSONP_ CALLBACK";作为回调属性:
// inside your service this._jsonp.get('/api/get?callback=JSONP_CALLBACK').map(data => { // Do stuff. });
在Angular 4.3及更高版本中,您应该使用HttpClientModule,因为JsonpModule已被弃用。
- 将HttpClientModule和HttpClientJsonpModule导入到您的模块中
- 将HttpClient注入到您的服务中
- 将回调键作为
jsonp
方法的第二个参数传递
app.module.ts
import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
// Import relevant http modules
import { HttpClientModule, HttpClientJsonpModule } from '@angular/common/http';
import { AppComponent } from './app.component';
import { ExampleService } from './example.service';
@NgModule({
declarations: [
AppComponent
],
imports: [
BrowserModule,
// Import relevant http modules
HttpClientModule,
HttpClientJsonpModule
],
providers: [ExampleService],
bootstrap: [AppComponent]
})
export class AppModule { }
example.service.ts
import { Injectable } from '@angular/core';
// Import HttpClient class
import { HttpClient } from '@angular/common/http';
@Injectable()
export class ExampleService {
// Inject HttpClient class
constructor(private http: HttpClient) { }
getData() {
const url = "https://archive.org/index.php?output=json&callback=archive";
// Pass the key for your callback (in this case 'callback')
// as the second argument to the jsonp method
return this.http.jsonp(url, 'callback');
}
}
如果此端点符合jsonp,则可以使用以下内容。您需要找到用于提供jsonp回调的参数。在下面的代码中,我称之为c
。
在调用bootstrap
函数时注册了JSONP_PROVIDERS
之后:
import {bootstrap} from 'angular2/platform/browser'
import {JSONP_PROVIDERS} from 'angular2/http'
import {AppComponent} from './app.component'
bootstrap(AppComponent, [ JSONP_PROVIDERS ]);
然后,您可以使用从构造函数注入的Jsonp
类的实例来执行请求
import {Component} from 'angular2/core';
import {Jsonp} from 'angular2/http';
@Component({
selector: 'my-app',
template: `
<div>
Result: {{result | json}}
</div>
`
})
export class AppComponent {
constructor(jsonp:Jsonp) {
var url = 'https://accounts.google.com/logout&c=JSONP_CALLBACK';
jsonp.request(url, { method: 'Get' })
.subscribe((res) => {
(...)
});
}
}
有关更多详细信息,请参阅此问题:
- 我需要通过组件帖子对邮件chimp订阅列表进行http请求
使用Angular 15的独立组件API,使用withJsonpSupport()
:
bootstrapApplication(AppComponent, {
providers: [provideHttpClient(withJsonpSupport())],
});