javascript/jQuery - What is jQuery.fx?

Question

I have seen $.fx.step. backgroundPosition = function(fx) {...} in some javascript snippet. I can\'t find much infomation about $.fx.

Can an

Answer 1

You can see more details about $.fx HERE

A new jQuery plugin that supports animating CSS colors of elements by using the new jQuery.fx.step.

Answer 2

Here is stated, that fx object is declared as follows:

fx: function( elem, options, prop ) {
        this.options = options;
        this.elem = elem;
        this.prop = prop;

        if ( !options.orig ) {
            options.orig = {};
        }
}

read more that link.

Answer 3

In short: fx is the basis of all jQuery effects like .animate, .hide, etc.

Code like the one you posted is meant to extend jQuery.fx.