【发布时间】:2016-12-20 01:38:47
【问题描述】:
我对 angular2 服务有一个小(大...)问题。 我正在尝试使用 ngModule 提供程序选项提供服务,但是当我尝试将其放入我的组件时,我得到:没有 ServiceName 提供程序(此处为 RankingService)。
app.module.ts
import { NgModule } from '@angular/core'
import { BrowserModule } from '@angular/platform-browser'
import { FormsModule } from '@angular/forms'
import { HttpModule } from '@angular/http'
/*
* App component and routing
*/
import { AppComponent } from './components/app/app.component'
import { routing } from './app.routes'
/*
* Services
*/
import { UserService } from './services/user.service'
import { RankingService } from './services/ranking.service'
/*
* Global components
*/
import { HeaderComponent } from './components/header/header.component'
import { FooterComponent } from './components/footer/footer.component'
/*
* App Components
*/
import { RankingComponent } from './components/ranking/ranking.component'
import { OthersComponent } from './components/others/others.component'
import { IpixsComponent } from './components/ipix/ipixs.component'
import { IpixDetailsComponent } from './components/ipix/ipix-details/ipix-details.component'
@NgModule({
imports: [
BrowserModule,
FormsModule,
HttpModule,
routing
],
declarations: [
AppComponent,
HeaderComponent,
FooterComponent,
RankingComponent,
OthersComponent,
IpixsComponent,
IpixDetailsComponent
],
providers: [
UserService,
RankingService
],
exports: [ AppComponent ],
bootstrap: [ AppComponent ]
})
export class AppModule { }
ranking.service.ts
import { Injectable } from '@angular/core'
/*
* Entities
*/
import { RankingUser } from './../entities/ranking-user'
@Injectable()
export class RankingService {
getRanking() {
const users: RankingUser[] = [
{ user: { picture : '', name: 'Edwige Chou' }, correlation: 100 },
{ user: { picture : '', name: 'Mathieu Vandeginste' }, correlation: 78 },
{ user: { picture : '', name: 'Isabelle Isa' }, correlation: 51 },
{ user: { picture : '', name: 'Julien Sergent' }, correlation: 39 },
{ user: { picture : '', name: 'Paul Raul' }, correlation: 23 },
{ user: { picture : '', name: 'Johnatan' }, correlation: 17 }
]
return users
}
}
ranking.component.ts
/*
* Dependencies
*/
import { Component, OnInit } from '@angular/core'
/*
* Services
*/
import { RankingService } from './../../services/ranking.service'
/*
* Entities
*/
import { RankingUser } from './../../entities/ranking-user'
@Component({
moduleId: module.id,
selector: 'ranking',
templateUrl: 'ranking.component.html',
styleUrls: [ 'ranking.component.css' ]
})
export class RankingComponent implements OnInit {
ranking: RankingUser[]
constructor(
private rankingService: RankingService
) { }
ngOnInit() {
this.getRanking()
}
getRanking() {
this.ranking = this.rankingService.getRanking()
console.log( this.ranking )
}
}
我看了很多次 angular doc 但我没有发现问题,谢谢你的帮助 ;-)
编辑:当我直接在我的组件中提供服务时,它是有效的,只将它提供到应用程序模块中不会。
编辑 2:我解决了我的问题,是我的 systemjs 配置错误,或者更确切地说是没有考虑管理这种情况:我创建了自己的包 (Twinipix),但我的应用程序不包含 Twinipix 文件夹而是公用文件夹,所以问题来自 jspm.config.js 文件:
packages[ "Twinipix" ] = {
main: "../public/main.js"
};
我使用该配置进行更多的逻辑导入(导入整个应用程序而不是单个文件),这正是我的完美主义者的一面! 因此,使用更常见的 systemjs 配置,一切都可以完美运行!
【问题讨论】:
-
一切看起来都差不多。请提供 plunker,因为在 rc5 之后很难从代码中找到错误。
-
奇怪的是它与 plunker 一起工作,我不明白为什么......这是code on plunker,你可以观察你的控制台并观察一个包含多个对象的日志,这就是 排名服务。我已经简化了代码(只有有问题的组件和服务)
标签: web-applications angular typescript