我有一个导入http的服务,当我在应用中使用它时会引发错误。" g InjectionError 的HTTP!错误没有提供商。"我正在懒惰的应用程序。另外,提供商是通过CLI" ionic g provider ...
"生成的
投诉 - 服务
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();
}
}
投诉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 {
}
有什么建议吗?
您必须将HttpModule
注册到模块(/app.module.ts
(:
import { HttpModule} from '@angular/http';
@NgModule({
imports: [
HttpModule
],
declarations: [ AppComponent ],
bootstrap: [ AppComponent ]
})
export class AppModule {
}
也将 HTTP
添加到提供者列表中。(到AppModule
(
import { HTTP } from '@ionic-native/http';
和
providers: [
...,
HTTP
]
使用angulat5 ,离子3
httpmodule在最新版本的ionic3和angular5中被弃用。因此,您必须使用httpclientmodule代替httpmodule。其他事情将与 @devqon的答案相同。之后,您可以在服务或组件文件中使用httpclient。
有关更多信息,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 {
}
import {HttpClientModule} from "@angular/common/http";
@NgModule({
declarations: [
ChatPage,
],
imports: [
IonicPageModule.forChild(ChatPage),
HttpModule,
HttpClientModule,// add HttpClientModule to import
SocketIoModule.forRoot(config)
],
})
不要忘记使用 Ionic Cordova运行浏览器,因为您需要一个平台运行Cordova插件