[英]Angular : Cannot read property 'on' of undefined
我正在尝试将Angular应用程序中的websockets与数据表组件一起使用
在每次添加时,我都运行conect()
函数以更新客户端上的内容。
import * as io from "socket.io-client";
@Component({
selector: "app-liste-projets",
templateUrl: "./liste-projets.component.html",
styleUrls: ["./liste-projets.component.css"]
})
export class ListeProjetsComponent implements OnInit {
constructor(private ajoutProj: AjoutprojService) {}
...
}
export class UserDataSource extends DataSource<any> {
constructor(private ajoutProj: AjoutprojService) {
super();
}
socket = io('http://127.0.0.1:8080');
connect():Observable<NouveauProjet[]> {
var data= this.ajoutProj.getAllProj();
return data;
}
this.socket.on("add", ()=>{
this.connect() })
}
我在this.socket.on..
行上收到此错误:
Uncaught TypeError: Cannot read property 'on' of undefined
尝试这个
export class UserDataSource extends DataSource<any> {
private socket: SocketIOClient.Socket;
constructor(private ajoutProj: AjoutprojService) {
super();
}
connect():Observable<NouveauProjet[]> {
this.socket = io.connect('http://127.0.0.1:8080')
this.socket.on('connect', () => {
console.log('WidgetSocket: Opened a new socket connection', this.socket.id);
});
var data= this.ajoutProj.getAllProj();
return data;
}
}
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.