findData plugin - search by data-KEY=VALUE on and in current jQ collection

finddata.jquery.js

/*
* by Dan Heberden / 2011
* demo at http://jsfiddle.net/danheberden/VjKMY/
* made just for Elijah Manor
* e.g.
*   $( 'div' ).findData( 'theDataKey', 'theValue' );
*   
*   will search in the divs and their children
*/
(function( $ ){
  $.fn.findData = function( key, value ) {
    var sel = '[data-' + key + '="' + value + '"]';
    return this.find( sel ).add( this.filter( sel ) ); 
  }
})( jQuery );