Angular 角度2-Http提供程序错误
我刚从Angular 2开始,我正在尝试获取一个http请求 代码如下Angular 角度2-Http提供程序错误,angular,Angular,我刚从Angular 2开始,我正在尝试获取一个http请求 代码如下 import { Component, View, bootstrap } from 'angular2/angular2'; import { TodoInput } from './todoInput.ts'; import { TodoList } from './todoList.ts'; import { TodoService } from './todoService.ts'; import { HttpSer
import { Component, View, bootstrap } from 'angular2/angular2';
import { TodoInput } from './todoInput.ts';
import { TodoList } from './todoList.ts';
import { TodoService } from './todoService.ts';
import { HttpService } from './httpService.ts';
@Component({
selector: 'my-app'
})
@ View({
directives: [TodoInput, TodoList]
templateUrl: 'templates/app.html'
})
class AppComponent {
color: string;
numbr: number;
hidden: boolean;
constructor(public myservice: TodoService, public https: HttpService) {
this.color = 'blue';
this.numbr = 5;
this.hidden = false;
https.getHttpData();
}
}
bootstrap(AppComponent, [TodoService, HttpService]);
http服务如下所示:
import { Http, HTTP_PROVIDERS } from 'angular2/http';
import {Injectable} from 'angular2/core'
@Injectable()
export class HttpService {
private url: string = 'http://www.omdbapi.com/?s=walking';
data: array[string] = [];
logError(error):void {
console.log(error);
}
constructor(public http: Http) {
}
public getHttpData() {
this.http.get(this.url)
.map(res => res.json())
.subscribe(
data => this.data = data,
err => this.logError(err),
() => console.log('Random Quote Complete')
);
}
}
当我运行应用程序时,我得到以下错误:EXCEPTION:没有e的提供者!(AppComponent->HttpService->e)
和angular2.dev.js:21835错误:DI异常
有什么想法吗?我错过了什么
提前感谢你的帮助
更新
我设法做到了。我希望它是正确的,但它是有效的:
import { Component, View, NgFor, FORM_DIRECTIVES, bootstrap } from 'angular2/angular2';
import { TodoInput } from './todoInput.ts';
import { TodoList } from './todoList.ts';
import { TodoService } from './todoService.ts';
import { HttpService } from './httpService.ts';
import { HTTP_PROVIDERS } from 'angular2/http';
@Component({
selector: 'my-app'
})
@View({
directives: [TodoInput, TodoList, NgFor, FORM_DIRECTIVES]
templateUrl: 'templates/app.html'
})
class AppComponent {
color: string;
numbr: number;
hidden: boolean;
shows: [string] = [];
constructor(public myservice: TodoService, public https: HttpService) {
this.color = 'blue';
this.numbr = 5;
this.hidden = false;
}
searchShows():void {
this.https.getHttpData(this.keyword).subscribe(
data => this.shows = data.Search,
err => console.log(err),
() => console.log('done!')
);
}
}
bootstrap(AppComponent, [HTTP_PROVIDERS, TodoService, HttpService]);
还有我的服务课:
import { Http } from 'angular2/http';
import { Inject } from 'angular2/core'
export class HttpService {
private url: string = 'http://www.omdbapi.com/?s=';
data: [string] = [];
logError(error):void {
console.log(error);
}
constructor(@Inject(Http) public http: Http) {
}
public getHttpData(keyword) {
return this.http.get(this.url + keyword)
.map(res => res.json());
}
}
但是,我不能让它工作,使服务成为唯一使用所有http所需依赖项的类。似乎主类必须引导http_提供者。不知道为什么。我不使用角度2,但是
- 您确定导入中包含HTTP_提供程序吗?Http还不够
- 在提供的代码中,在“@”和“视图”之间有一个空格:
构造函数(@Inject(Http)Http:Http){
仍然得到相同的错误…良好的观察:HTTP\u提供程序
应该通过组件中的boostrap
或PROVIDERS/viewProviders
注入。是的,通过main.ts的bootstrap
添加HTTP\u提供程序解决了问题!但是,当通过PROVIDERS/viewPr>添加它时oviders
在httpService.ts中,它不起作用(空白页,没有错误)。你知道为什么后者不起作用吗?@uglycode你必须使用组件中的那些:@component({providers:[HTTP\u providers]})
不在您的服务范围内class@EricMartinez我不太清楚你的意思。我在引导应用程序时添加了这一点:bootstrap(AppComponent[HTTP\u PROVIDERS,TodoService,HttpService]);
并将其包含在类的顶部:import{HTTP\u PROVIDERS}从“angular2/http”;
开始,它就可以工作了。我不需要将您编写的内容添加到@组件中。
。我将编辑我的原始帖子并粘贴有效的解决方案,您可以告诉我在哪里(如果)我做错了任何事。Http是不够的,因为Http本身依赖于另一个类。Http_提供程序是一种语法糖,它阻止您导入类的所有依赖项。