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Angular 4和Ionic 3没有HTTP的提供者

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我有一个导入Http的服务，当我在我的应用程序中使用它时会抛出错误 . “ No provider for Http! Error at g injectionError ". I am lazyloading the app. Also the provider was generated through cli " ionic g provider ... ”

complaint-service.ts

import { Injectable } from '@angular/core';
import { Http } from '@angular/http';
import 'rxjs/add/operator/map';

@Injectable()
export class ComplaintService {
    private complaints: {subject: string, description: string}[] = [];

    constructor(public http: Http) {
        this.http = http;
        this.complaints = null;
        console.log('Hello ComplaintService Provider');
    }

    addComplaints(complaint: {subject: string, description: string}) {
        this.complaints.push(complaint);
    }

    getComplaints() {
        return this.complaints.slice();
    }

}

complaint-form.ts

import { Component } from '@angular/core';
import {Validators, FormBuilder, FormGroup } from '@angular/forms';
import { IonicPage, NavController, NavParams } from 'ionic-angular';
import {ComplaintService} from '../../providers/complaint-service';


@IonicPage()
@Component({
  selector: 'page-complaint-form',
  templateUrl: 'complaint-form.html',
  providers: [ComplaintService]
})
export class ComplaintForm {

}

有什么建议？

angular ionic3

4 回答

  • 64

    您必须将 HttpModule 注册到您的模块（ /app.module.ts ）：

    import { HttpModule} from '@angular/http';

@NgModule({
  imports: [
    HttpModule
  ],
  declarations: [ AppComponent ],
  bootstrap:    [ AppComponent ]
})
export class AppModule {
}
    回复于
  • 0

    将 HTTP 添加到提供者列表中 . （至 AppModule ）

    import { HTTP } from '@ionic-native/http';

    和

    providers: [
    ...,
    HTTP 
  ]

    使用Angulat5，Ionic 3

    回复于
  • 0

    HttpModule在最新版本的ionic3和Angular5中已被弃用 . 因此，您必须使用HttpClientModule而不是HttpModule . 其他事情与@ devqon的答案相同 . 之后，您可以在服务或组件文件中使用HttpClient .

    有关详细信息，请参阅Angular的原始文档 .

    https://angular.io/guide/http

    import {HttpClientModule} from "@angular/common/http";

@NgModule({
  imports: [
    HttpClientModule
 ],
 declarations: [ AppComponent ],
 bootstrap:    [ AppComponent ]
})
export class AppModule {
}
    回复于
  • 0
    import {HttpClientModule} from "@angular/common/http";

@NgModule({
  declarations: [
    ChatPage,
  ],
  imports: [
    IonicPageModule.forChild(ChatPage),
    HttpModule,
    HttpClientModule,// add HttpClientModule to import
    SocketIoModule.forRoot(config)
  ],

})

    不要忘记运行 ionic cordova run browser 因为你需要一个平台来运行cordova插件

    回复于

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