angular - How to act on callback function -

i have script connects server using websocket

export class appcomponent {    connection_status = false;   message = '';    public connect() {     this.socket = io('http://localhost:5001');     this.socket.on('connected', this.connection_established);   } } 

i change connection_status variable when connected message received , save content of message message variable.

export class appcomponent {    connection_status = false;   message = '';    public connect() {     this.socket = io('http://localhost:5001');     this.socket.on('connected', this.connection_established.bind(this));   }    connection_established() {     this.connection_established = true;     this.message = 'connected';   } }