use of "that" keyword in javascript [duplicate]

Question

I have few javascript that has used the keyword "that" extensively. I see a lot of posts talking about the javascript keyword "this".

I wanted to understand the meaning of this key word in javascript context and it's visibility/scope.

Something like

that.someFunctionaName(someParameter)

What does it mean?

I understand the keyword "this" always points to the owner of the current object.

Answer 1

that is not a keyword in JavaScript. I suspect the code that you have is using something in the class to define an instance of itself. For example:

function myClass()
{
    var that = this;
}

By doing this, you can ensure you're referencing the object, and not another element. For example, consider the following sample:

function myClass()
{
    var that = this;
    $('.myele').click(function() {  

        // 'this' refers to the element that was clicked.
        // 'that' still refers to the myClass() object.
    });
}