Applying javascript to a textbox unobtrusively

Question

The title of the question is really vague and I am sorry for that.

What want to do is something like this (many third party libraries do that)

$( "#datepicker" ).datepicker();

I want to apply a function like datepicker() to a textbox. What the function does is not important, but how it is being applied like above is what I am trying to find out how to do.

Thanks.

Answer 1

(function($){
   $.fn.datepicker=function(){
      // do whatever you wanna do
      return this;
   }; 
})(jQuery);

allows you to do

$('#datepicker').datepicker();