How to use THIS keyword inside a typescript callback method

When using callbacks in Typescript you  would (most of the time) want to invoke object reference methods instead of static methods.

To do this you would need to make use of the "this" keyword inside the callback, but you need to define the callback in a certain way otherwise "this" refers to the callback itself.

The correct way to define the callback method is:

	class callbackSample {
	constructor (){
	}
	doSomethingElse()
	{
	alert('invoked from callback');
	}
	// Define the callback method signature and the implementation
	public someCallbackMethod: () => void = () => {
	this.doSomethingElse();
	}
	}

view raw callbackSample.ts hosted with ❤ by GitHub

If you are expecting a JSON result in the callback you can define the callback to use parameters like this:

	class callbackSampleParams {
	constructor (){
	}
	doSomethingElse(data)
	{
	alert(data);
	}
	// Define the callback method signature and the implementation to include params
	public someCallbackMethod: (data, status, jqXHR) => void = (data, status, jqXHR) => {
	this.doSomethingElse(data);
	}
	}

view raw callbackSampleParams.ts hosted with ❤ by GitHub