Angular 角度分量不';t注入服务
我试图按照MEAN stack教程构建todo列表,但遇到了一个问题,即我的组件(我在其中注入了我的服务)无法工作,并且没有任何错误消息。你知道为什么吗 task.service.tsAngular 角度分量不';t注入服务,angular,mean-stack,angular-services,Angular,Mean Stack,Angular Services,我试图按照MEAN stack教程构建todo列表,但遇到了一个问题,即我的组件(我在其中注入了我的服务)无法工作,并且没有任何错误消息。你知道为什么吗 task.service.ts import {Injectable} from '@angular/core'; import {Http, Headers} from '@angular/http'; import 'rxjs/add/operator/map'; @Injectable() export class TaskServi
import {Injectable} from '@angular/core';
import {Http, Headers} from '@angular/http';
import 'rxjs/add/operator/map';
@Injectable()
export class TaskService{
constructor(private http:Http){
console.log('Task service initialized...'); //this part works
}
getTasks(){
return this.http.get('http://localhost:3000/api/tasks')
.map(res => res.json());
}
}
tasks.component.ts
import { Component } from '@angular/core';
import {TaskService} from '../../services/task.service';
@Component({
moduleId: module.id,
selector: 'tasks',
templateUrl: 'tasks.component.html',
})
export class TasksComponent {
constructor(private taskService:TaskService){
this.taskService.getTasks()
.subscribe(tasks => {
console.log(tasks);
});
}
}
import { Component } from '@angular/core';
import {TaskService} from './services/task.service';
@Component({
moduleId: module.id,
selector: 'my-app',
templateUrl: 'app.component.html',
providers: [TaskService]
})
export class AppComponent { }
app.module.ts
import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { HttpModule } from '@angular/http';
import { AppComponent } from './app.component';
import { TasksComponent } from './components/tasks/tasks.component';
@NgModule({
imports: [ BrowserModule, HttpModule ],
declarations: [ AppComponent, TasksComponent ],
bootstrap: [ AppComponent ],
})
export class AppModule { }
app.component.ts
import { Component } from '@angular/core';
import {TaskService} from '../../services/task.service';
@Component({
moduleId: module.id,
selector: 'tasks',
templateUrl: 'tasks.component.html',
})
export class TasksComponent {
constructor(private taskService:TaskService){
this.taskService.getTasks()
.subscribe(tasks => {
console.log(tasks);
});
}
}
import { Component } from '@angular/core';
import {TaskService} from './services/task.service';
@Component({
moduleId: module.id,
selector: 'my-app',
templateUrl: 'app.component.html',
providers: [TaskService]
})
export class AppComponent { }
你的模块在哪里?你在那里注册服务了吗?当你说它不起作用时,你是什么意思?您是否收到任何错误消息?已添加我的app.module.ts。我没有在那里注册服务,它在app.component.ts中。但我试过了,但没有改变情况。我在控制台中没有任何错误消息。@Sylvanas9189,你能试着用模拟json在plunker中重现这个问题吗?:)