How Can I Preserve the `this` Context in JavaScript's `setInterval` Callback?

Preserving this in JavaScript's setInterval Callback

In JavaScript, the this keyword refers to the object that owns the currently executing code. This can become problematic when using setInterval, as the callback function is executed in a different context, losing access to the original this. To overcome this:

Accessing this in setInterval Handlers

To allow access to this in the setInterval callback, we can use the bind() method:

this.intervalID = setInterval(this.retrieve_rate.bind(this), this.INTERVAL);

Here, bind(this) ensures that the this within the retrieve_rate callback always refers to the object where the interval was set (i.e., the object where prefs is defined).

With this modification, you can now access this.prefs within the ajax.onload callback:

ajax.onload = function()
{
    // Access this.prefs here
}

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