Angular 2 RC 5 引导自定义 HTTP 类

Question

Angular 2 RC 5 引导自定义 HTTP 类

angulartypescriptangular2-directivesangular2-services

3

在 Angular 2 RC 4 中，我有一个名为 HttpLoading 的类，它扩展了 Angular2 的原始 Http 类。

我可以在 Bootstrap 中使用以下代码而没有任何问题：

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));

我的默认请求选项类

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 类如下所示:

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);
    }
}

使用RC 5版本，我不确定如何将此代码部分迁移到NgModule提供商列表中。

我已经按照迁移指南更新了我的NgModule，如下所示：

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 { }

但似乎还没有正确添加，因为当我在组件中使用http时，它仍然会命中默认的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) => {

            });
    }
}

请问有人能指导一下吗？

- Naveed Ahmed

3个回答

2

非常感谢大家的帮助，我已经通过删除

来解决了问题。

{ provide: RequestOptions, useClass: DefaultRequestOptions },

似乎在RC 5中这是不必要的。

- Naveed Ahmed

1

我遇到了相同的问题...将主体设置为空字符串解决了它。

因此，get可以接收第二个参数“RequestOptions”...请确保将body属性设置为''。

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

- Boban Stojanovski

网页内容由stack overflow 提供, 点击上面的

可以查看英文原文，
原文链接

- Ankit Singh · Accepted Answer

从RC5版本开始，你需要使用@NgModule类来引导程序而不是使用根组件，示例代码如下，更多信息请参考这篇RC4 => RC5过渡指南。

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);