Angular 2 RC 5 Bootstrap 自定义 HTTP class

Question

在 Angular 2 RC 4 我有一个 class HttpLoading 扩展了 Angular2

的原始 Http

我能够在 bootstrap 中使用它，使用以下代码没有任何问题：

bootstrap(AppComponent, [
    HTTP_PROVIDERS,
    provide(RequestOptions, { useClass: DefaultRequestOptions }),
    provide(Http, {
        useFactory: (backend: XHRBackend, defaultOptions: RequestOptions) => new HttpLoading(backend, defaultOptions),
        deps: [XHRBackend, RequestOptions]
    })
]).catch(err => console.error(err));

我的默认请求选项class

import { Injectable } from '@angular/core';
import { Headers, BaseRequestOptions } from '@angular/http';

@Injectable()
export class DefaultRequestOptions extends BaseRequestOptions {
    headers: Headers = new Headers({
        'Content-Type': 'application/json'
    });
}

我的 HttpLoading Class 看起来像这样：

import { Http, RequestOptionsArgs, ConnectionBackend, RequestOptions, Response } from '@angular/http'
import { Injectable } from '@angular/core'
import {GlobalService} from './globalService';
import { Observable } from 'rxjs/Observable';

export class HttpLoading extends Http {

    constructor(backend: ConnectionBackend, defaultOptions: RequestOptions, private _globalService: GlobalService) {
        super(backend, defaultOptions);
    }

    get(url: string, options?: RequestOptionsArgs): Observable<any> {
        this._globalService.isLoading = true;
        return super.get(url, options)
            .map(res => {
                this._globalService.isLoading = false;
                return res.json();
            })
            .catch(this.handleError);
    }
}

对于 RC 5，我不确定如何将这部分代码迁移到 NgModule 提供者列表。

我已遵循迁移指南并将我的 NgModule 更新为以下内容：

import { NgModule }       from '@angular/core';
import { BrowserModule  } from '@angular/platform-browser';
import { FormsModule, ReactiveFormsModule }   from '@angular/forms';
import { HttpModule }     from '@angular/http';
import { Http, HTTP_PROVIDERS, RequestOptions, XHRBackend } from '@angular/http';

import { DefaultRequestOptions } from './DefaultRequestOptions';
import { HttpLoading } from './http-loading';

import { routing }        from './app.routing';
import { AppComponent } from './components/app.component';


@NgModule({
    imports: [
        BrowserModule,
        FormsModule,
        ReactiveFormsModule,
        HttpModule,
        routing
    ],
    declarations: [
        AppComponent
    ],
    providers: [
        HTTP_PROVIDERS,
        { provide: RequestOptions, useClass: DefaultRequestOptions },
        {
            provide: Http,
            useFactory: (backend: XHRBackend, defaultOptions: RequestOptions, globalService: GlobalService) => new HttpLoading(backend, defaultOptions, globalService),
            deps: [XHRBackend, RequestOptions, GlobalService]
        }
    ],
    bootstrap: [AppComponent],
})
export class AppModule { }

但它似乎仍然没有正确添加，因为在我的组件中，当我使用 http 时，它仍然点击默认的 http 而不是我的自定义 http 服务。

import { Component, OnInit } from '@angular/core';
import { Http } from '@angular/http';

@Component({
    templateUrl: '../../templates/home/home.html'
})
export class HomeComponent implements OnInit {

    constructor(private http: Http) {}

    ngOnInit() {
        this.http.get('/home')
            .subscribe((data) => {

            });
    }
}

谁能指导一下吗？

Answer 1

从 >=RC5 现在你 bootstrap 一个 @NgModule class 而不是像这样的根组件，阅读更多关于 this RC4 => RC5 transition guide。

import { NgModule }       from '@angular/core';
import { HttpModule } from '@angular/http';
import { AppComponent }   from './app.component';

@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [HttpModule],  // no need for HTTP_DIRECTIVES
  providers: [
    {provide: RequestOptions, useClass: DefaultRequestOptions },
    {provide: Http, useFactory: (backend: XHRBackend, defaultOptions: RequestOptions) => new HttpLoading(backend, defaultOptions), deps: [XHRBackend, RequestOptions]}
  ],
  bootstrap: [AppComponent]
})
export class AppModule {}

platformBrowserDynamic().bootstrapModule(AppModule);

Answer 2

我遇到了同样的问题...将正文设置为空字符串解决了它。

所以get可以接收第二个参数a"RequestOptions" ...一定要设置body属性为''

像这样 ...

.http.get(BaseService.apiUrl + api/someMethod, { body : '' }) ...

Answer 3

非常感谢大家的帮助，我通过删除

解决了这个问题

{ provide: RequestOptions, useClass: DefaultRequestOptions },

RC 5 似乎没有必要。

Angular 2 RC 5 Bootstrap 自定义 HTTP class

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