What is the best way to ensure that the function is referencing the class appropriately?

Question

What is the best way to ensure that the function is referencing the class appropriately?

Typically when using this, it points to the class being referenced.

However, in this scenario, this is set to dataChannel. How can I make this point back to VideoService? Thank you.

export class VideoService {
    dataChannel:any;

    setupPeerConnection() {
        this.dataChannel.onopen = this.dataChannelStateChanged;
    }

    dataChannelStateChanged() {
        // currently 'this' refers to dataChannel, how can we switch it to refer to VideoService
        console.log(this); 
    }
}

javascript typescript angular webrtc

Answer 1

Answer №1

One possible solution is to utilize the bind method.

initializeConnection() {
    this.updateData.onchange = this.updateDataState.bind(this);
}

The bind function essentially duplicates a function with a specified object assigned as its context.

Answer 2

One possible solution is to utilize the bind method.

initializeConnection() {
    this.updateData.onchange = this.updateDataState.bind(this);
}

The bind function essentially duplicates a function with a specified object assigned as its context.

Answer 3

Answer №2

One approach is to bind context explicitly using Function.prototype.bind:

export class VideoService {
    dataChannel:any;

    setupPeerConnection() {
        this.dataChannel.onopen = this.dataChannelStateChanged.bind(this);
    }

    dataChannelStateChanged() {
        console.log(this); 
    }
}

Alternatively, you can utilize arrow functions to maintain lexical scope:

export class VideoService {
    dataChannel:any;

    setupPeerConnection() {
        this.dataChannel.onopen = () => this.dataChannelStateChanged();
    }

    dataChannelStateChanged() {
        console.log(this); 
    }
}

Answer 4

One approach is to bind context explicitly using Function.prototype.bind:

export class VideoService {
    dataChannel:any;

    setupPeerConnection() {
        this.dataChannel.onopen = this.dataChannelStateChanged.bind(this);
    }

    dataChannelStateChanged() {
        console.log(this); 
    }
}

Alternatively, you can utilize arrow functions to maintain lexical scope:

export class VideoService {
    dataChannel:any;

    setupPeerConnection() {
        this.dataChannel.onopen = () => this.dataChannelStateChanged();
    }

    dataChannelStateChanged() {
        console.log(this); 
    }
}

What is the best way to ensure that the function is referencing the class appropriately?

Answer №1

Answer №2

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