Question

我使用 ionic 3.2 和angular，对于安装HTTP（https://ionicframework.com/docs/native/http/）我使用以下命令：

ionic cordova plugin add cordova-plugin-advanced-http
npm install --save @ionic-native/http

在脚本autenticar.ts中，我添加了import { HTTP } from '@ionic-native/http';，如下所示：

import { Component, ViewChild } from '@angular/core';
import { NavController } from 'ionic-angular';
import { HTTP } from '@ionic-native/http';

@Component({
  selector: 'page-autenticar',
  templateUrl: 'autenticar.html'
})
export class AutenticarPage {

  @ViewChild('username') username;
  @ViewChild('password') password;

  constructor(public navCtrl: NavController, public http: HTTP) {
    console.log(http)
  }

...

重新加载应用后，我收到此错误：

Runtime Error
Uncaught (in promise): Error: StaticInjectorError(AppModule)
[AutenticarPage -> HTTP]: StaticInjectorError(Platform: core)[AutenticarPage -> HTTP]:
NullInjectorError: No provider for HTTP!
Error: StaticInjectorError(AppModule)[AutenticarPage -> HTTP]:
StaticInjectorError(Platform: core)[AutenticarPage -> HTTP]:
NullInjectorError: No provider for HTTP! at _NullInjector.get
(http://localhost:8100/build/vendor.js:1376:19) at resolveToken
(http://localhost:8100/build/vendor.js:1674:24) at tryResolveToken
(http://localhost:8100/build/vendor.js:1616:16) at StaticInjector.get
(http://localhost:8100/build/vendor.js:1484:20) at resolveToken
(http://localhost:8100/build/vendor.js:1674:24) at tryResolveToken
(http://localhost:8100/build/vendor.js:1616:16) at StaticInjector.get
(http://localhost:8100/build/vendor.js:1484:20) at resolveNgModuleDep
(http://localhost:8100/build/vendor.js:11228:25) at NgModuleRef_.get
(http://localhost:8100/build/vendor.js:12461:16) at resolveDep
(http://localhost:8100/build/vendor.js:12951:45)

我试试这个answer，说我必须添加app.module.ts这个import { HttpModule } from '@angular/http';，如下所示：

import { NgModule, ErrorHandler } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { IonicApp, IonicModule, IonicErrorHandler } from 'ionic-angular';
import { HttpModule } from '@angular/http';
import { MyApp } from './app.component';

....

  imports: [
    BrowserModule,
    HttpModule,
    IonicModule.forRoot(MyApp)
  ],

...

但仍然是同样的错误。

Answer 1

您需要在提供商中添加HTTP

app.module.ts

...

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

...

@NgModule({
  ...

  providers: [
    ...
    HTTP
    ...
  ]
  ...
})
export class AppModule { }

Answer 2

您需要在 providers

下添加HTTP

providers: [
    HTTP
]

ionic-native / http发出错误“NullInjectorError：HTTP没有提供者！”

2 个答案: