我正在制作一个示例应用程序,以连接打字稿中ionic 2中的Websocket服务器。链接到回购
我的要求是在应用程序启动期间建立websocket连接
我正在使用angular2-websocket创建连接。
参考文献:
http://blog.thoughtram.io/angular/2015/09/17/resolve-service-dependencies-in-angular-2.html
http://blog.thoughtram.io/angular/2015/05/18/dependency-injection-in-angular-2.html
我收到一个错误“无法解析'$ WebSocket'(String,Array,?)的所有参数。请确保所有参数都用Inject装饰或具有有效的类型注释,并且'$ WebSocket'用Injectable装饰。 ”
代码:app.ts
import {App, Platform} from 'ionic-framework/ionic';
import {TabsPage} from './pages/tabs/tabs';
import {ConnectionService} from './framework/connection/connection-service'
import {$WebSocket} from 'angular2-websocket/angular2-websocket';
import {bootstrap} from 'angular2/platform/browser';
// https://angular.io/docs/ts/latest/api/core/Type-interface.html
import {Type} from 'angular2/core';
@App({
template: '<ion-nav [root]="rootPage"></ion-nav>',
config: {}
})
export class MyApp {
rootPage: Type = TabsPage;
constructor(platform: Platform, private conn : ConnectionService) {
platform.ready().then(() => {
this.conn.connect();
});
}
}
bootstrap(MyApp, [$WebSocket, ConnectionService]);
import {Injectable, Component, Inject} from 'angular2/core';
import {$WebSocket} from 'angular2-websocket/angular2-websocket';
import {bootstrap} from 'angular2/platform/browser';
@Injectable()
export class ConnectionService {
private _status: number;
//private connection: $WebSocket;
constructor( private connection : $WebSocket = new $WebSocket("ws://echo.websocket.org") ) {
console.log("Starting connection");
//this.connection = new $WebSocket("ws://echo.websocket.org");
this.connection.onClose(this.onCloseHandler);
this.connection.onError(this.onErrorHandler);
this.connection.onOpen(this.onOpenHandler);
this.connection.onMessage(this.onRecieveHandler, {});
}
...
public connect() {
this.connection.connect(true);
}
...
}
bootstrap(ConnectionService, [$WebSocket]);
解决我的问题的方法是使用@App()注解(特定于离子)提供程序字段,而不使用引导程序
bootstrap(ConnectionService,
[provide($WebSocket, useValue: new WebSocket("ws://echo.websocket.org")]);
例如。
@App({
template: '<ion-nav [root]="rootPage"></ion-nav>',
config: {},
providers : [ provide( $WebSocket, { useValue: new $WebSocket("ws://echo.websocket.org") }), ConnectionService]
})
工作样本可以在这里找到
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