javascriptangulartypescriptdeezer

How to access angular component from 3rd party library

I'm building web app which uses Deezer player by official JS SDK. The problem I met is that I cannot access my Angular component from Deezer event subscription. Arrow function doesn't understand context of this, so I cannot call my component's methods and pass values to them. What is correct way to achieve that?

app.component.ts

// ...

declare var DZ;

// ...

export class AppComponent implements OnInit {
    currentTrack: any = null;

    constructor() {}

    ngOnInit(): void {
        DZ.init({
            appId  : '8',
            channelUrl : 'https://developers.deezer.com/examples/channel.php',
            player : {
                onload : this.onPlayerLoaded
            }
        });
    }

    onPlayerLoaded() {
        DZ.player.playAlbum(302127);

        DZ.Event.subscribe('player_position', console.log);
        DZ.Event.subscribe('current_track', (response) => {
            // I would like to pass response.track to setCurrentTrack() there
        });
    }

    setCurrentTrack(track) {
        this.currentTrack = track;
    }
}

index.html

// ...

<head>
    <script type="text/javascript" src="https://e-cdns-files.dzcdn.net/js/min/dz.js"></script>
</head>

// ...
Solution

  • In order to help other individuals, you should .bind(this) to your function call because its likely that this is referring to the DZ context and no longer your class:

    ngOnInit(): void {
    DZ.init({
        appId  : '8',
        channelUrl : 'https://developers.deezer.com/examples/channel.php',
        player : {
            onload : this.onPlayerLoaded.bind(this)  //Fix right here
        }
    });
}