What is the proper way to invoke requestAnimFrame on a method within an object?

Imagine a scenario where the following object exists:

function Foo(value){
    this.bar = value;
    this.update();
}
Foo.prototype.update = function(){
    console.log(this.bar);
    this.bar++;
    requestAnimationFrame(this.update);
}
Foo.prototype.setBar(value){
    this.bar = value;
}

An issue arises, as FireFox presents an error:

NS_ERROR_ILLEGAL_VALUE: Component returned failure code: 0x80070057 (NS_ERROR_ILLEGAL_VALUE) [nsIDOMWindow.requestAnimationFrame]

I am seeking insight into why this error occurs and potential alternative approaches to invoke an object's update method without direct invocation within the main function (i.e., while maintaining the object's anonymity).

Answer №1

requestAnimationFrame does not automatically bind `this` to anything, as with any direct call. To achieve this binding, you can manually use Function.prototype.bind:

Foo.prototype.update = function(){
    console.log(this.bar);
    this.bar++;
    requestAnimationFrame(Foo.prototype.update.bind(this));
};

Another way to bind permanently is:

function Foo() {
    …
    this.update = this.update.bind(this);
    this.update();
}

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