supplantClass jQuery plugin

jquery.supplantclass.js

/**
 * supplantClass() jQuery plugin
 *
 * Adds the replacement class string to each element.
 *
 * If a class or classes contain the needle, they are removed from the element.
 */
(function ($) {
  // Add the plugin as a property of the jQuery fn object.
  $.fn['supplantClass'] = function (needle, replacement) {
    return this.each(function (index, element) {
      var $this = $(this);
      var cl = [];
      // Get an array of classes the excludes any that contain the needle.
      var classes = $this.attr('class').split(' ');
      for (var i = 0; i < classes.length; i++) {
        if (classes[i].indexOf(needle) === -1) {
          cl.push(classes[i]);
        }
      }
      // Push the replacement in all cases.
      $.merge(cl, replacement.split(' '));
      // Create a string and assign it to the object.
      $this.removeAttr('class').addClass(cl.join(' '));
    });
  };
}(jQuery));