EventSource dynamic binding variable

Question

I try to update and display message from variable updated into EventSource function:

ngOnInit(): void {
     const EventSource: any = window['EventSource'];
     const fx = new EventSource('/weather/update/');
     fx.onmessage = function (evt) {
          this.newMessage  = evt.data;
          console.log(this.newMessage);
     }
}

in template:

<p>{{newMessage}}</p>

The received message always is empty, but in console i can see the new message.

yurzui · Accepted Answer · 2020-10-16 03:22:12Z

1

You're loosing context this. Try using arrow function in order to preserve this:

               like this     
                  \/
fx.onmessage = evt => {
   this.newMessage  = evt.data;
   console.log(this.newMessage);
}

answered Oct 16, 2020 at 3:22

yurzui

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