我试图HTTP提供导入服务,但我发现了以下错误:角2 HTTP“无法解析所有的参数AppService服务'”
Cannot resolve all parameters for 'AppService'(?). Make sure that all the parameters are decorated with Inject or have valid type annotations and that 'AppService' is decorated with Injectable.
这里有一些代码段:
<script src="~/es6-shim/es6-shim.min.js"></script>
<script src="~/systemjs/dist/system-polyfills.js"></script>
<script src="~/angular2/bundles/angular2-polyfills.js"></script>
<script src="~/systemjs/dist/system.src.js"></script>
<script src="~/rxjs/bundles/Rx.js"></script>
<script src="~/angular2/bundles/angular2.dev.js"></script>
<script src="~/angular2/bundles/http.dev.js"></script>
<!-- 2. Configure SystemJS -->
<script>
System.config({
map: { 'rxjs': 'RCO/rxjs' },
packages: {
RCO: {
format: 'register',
defaultExtension: 'js'
},
'rxjs': {defaultExtension: 'js'}
}
});
System.import('RCO/Areas/ViewOrganization/AngularTemplates/boot')
.then(null, console.error.bind(console));
boot.ts
import {bootstrap} from 'angular2/platform/browser'
import {HTTP_PROVIDERS} from 'angular2/http'
import 'rxjs/add/operator/map'
import {AppComponent} from 'RCO/Areas/ViewOrganization/AngularTemplates/app.component'
import {AppService} from 'RCO/Areas/ViewOrganization/AngularTemplates/app.service'
bootstrap(AppComponent, [HTTP_PROVIDERS, AppService]);
app.service.ts
import {Injectable} from 'angular2/core';
import {Http, Response} from 'angular2/http';
import {Observable} from 'rxjs/Rx';
@Injectable()
export class AppService {
constructor(private http: Http) { }
// Uses http.get() to load a single JSON file
getTableData() {
return this.http.get('...').map((res: Response) => res.json());
}
}
我想调用服务器上的控制器,最终将JSON文件加载到数据表中。非常简单的东西,但我加载Http模块的方式似乎是错误的。任何帮助都感激不尽。
你使用的是打字稿编译器吗?如果没有,那么这将是这种情况http://stackoverflow.com/a/35350172/2435473 –
修复它......谢谢 – ddpdoj
这应该是这样的。但是,如果您不使用TypeScript,而只使用ES6(对于方法参数不支持类型),则需要为Angular2指定有关注入内容的附加元数据。在这种情况下,@ Pankaj的描述了如何做到这一点;-) –