"

From 2013.igem.org

/*!

* classie - class helper functions
* from bonzo https://github.com/ded/bonzo
* 
* classie.has( elem, 'my-class' ) -> true/false
* classie.add( elem, 'my-new-class' )
* classie.remove( elem, 'my-unwanted-class' )
* classie.toggle( elem, 'my-class' )
*/

/*jshint browser: true, strict: true, undef: true */

( function( window ) {

'use strict';

// class helper functions from bonzo https://github.com/ded/bonzo

function classReg( className ) {

 return new RegExp("(^|\\s+)" + className + "(\\s+|$)");

}

// classList support for class management // altho to be fair, the api sucks because it won't accept multiple classes at once var hasClass, addClass, removeClass;

if ( 'classList' in document.documentElement ) {

 hasClass = function( elem, c ) {
   return elem.classList.contains( c );
 };
 addClass = function( elem, c ) {
   elem.classList.add( c );
 };
 removeClass = function( elem, c ) {
   elem.classList.remove( c );
 };

} else {

 hasClass = function( elem, c ) {
   return classReg( c ).test( elem.className );
 };
 addClass = function( elem, c ) {
   if ( !hasClass( elem, c ) ) {
     elem.className = elem.className + ' ' + c;
   }
 };
 removeClass = function( elem, c ) {
   elem.className = elem.className.replace( classReg( c ), ' ' );
 };

}

function toggleClass( elem, c ) {

 var fn = hasClass( elem, c ) ? removeClass : addClass;
 fn( elem, c );

}

window.classie = {

 // full names
 hasClass: hasClass,
 addClass: addClass,
 removeClass: removeClass,
 toggleClass: toggleClass,
 // short names
 has: hasClass,
 add: addClass,
 remove: removeClass,
 toggle: toggleClass

};

})( window );