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Extending jQuery library

The beauty of jQuery is that is extensible. You can easily extend the jQuery function or its alias $.

For e.g.

$.fn.disable = function()
{
  return this.each(function()
{
if(typeof this.disabled != 'undefined') this.disabled = true;
}
);
}

The above code creates a function which will disable the element and return the element collections so that you can cascade more jQuery funtions

e.g $("input").disable();

The above code disables all input type elements.

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