在angular2 rc 4中,我有一个类httploading,它扩展了angular2的原始http
我可以在引导程序中使用它,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);
}
}
对于rc 5,我不确定如何将这部分代码迁移到ngmodule providers列表。
我已经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,它仍然会命中默认http而不是自定义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) => {
});
}
}
有人能指点一下吗?
最佳答案
既然>=RC5
现在引导的是一个@NgModule
类,而不是像这样引导根组件,那么请阅读this RC4 => RC5 transition guide的更多内容。
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);