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/**

 * DropKick

 *

 * Highly customizable <select> lists

 * https://github.com/JamieLottering/DropKick

 *

 * &copy; 2011 Jamie Lottering <http://github.com/JamieLottering>

 *                        <http://twitter.com/JamieLottering>

 * 

 */

(function ($, window, document) {

  var ie6 = false;

  // Help prevent flashes of unstyled content

  if ($.browser.msie && $.browser.version.substr(0, 1) < 7) {

    ie6 = true;

  } else {

    document.documentElement.className = document.documentElement.className + ' dk_fouc';

  }

  var

    // Public methods exposed to $.fn.dropkick()

    methods = {},

    // Cache every <select> element that gets dropkicked

    lists   = [],

    // Convenience keys for keyboard navigation

    keyMap = {

      'left'  : 37,

      'up'    : 38,

      'right' : 39,

      'down'  : 40,

      'enter' : 13

    },

    // HTML template for the dropdowns

    dropdownTemplate = [

      '<div class="dk_container" id="dk_container_{{ id }}" tabindex="{{ tabindex }}">',

        '<a class="dk_toggle">',

          '<span class="dk_label">{{ label }}</span>',

        '</a>',

        '<div class="dk_options">',

          '<ul class="dk_options_inner">',

          '</ul>',

        '</div>',

      '</div>'

    ].join(''),

    // HTML template for dropdown options

    optionTemplate = '<li class="{{ current }}"><a data-dk-dropdown-value="{{ value }}">{{ text }}</a></li>',

    // Some nice default values

    defaults = {

      startSpeed : 1000,  // I recommend a high value here, I feel it makes the changes less noticeable to the user

      theme  : false,

      change : false

    },

    // Make sure we only bind keydown on the document once

    keysBound = false

  ;

  // Called by using $('foo').dropkick();

  methods.init = function (settings) {

    settings = $.extend({}, defaults, settings);

    return this.each(function () {

      var

        // The current <select> element

        $select = $(this),

        // Store a reference to the originally selected <option> element

        $original = $select.find(':selected').first(),

        // Save all of the <option> elements

        $options = $select.find('option'),

        // We store lots of great stuff using jQuery data

        data = $select.data('dropkick') || {},

        // This gets applied to the 'dk_container' element

        id = $select.attr('id') || $select.attr('name'),

        // This gets updated to be equal to the longest <option> element

        width  = settings.width || $select.outerWidth(),

        // Check if we have a tabindex set or not

        tabindex  = $select.attr('tabindex') ? $select.attr('tabindex') : '',

        // The completed dk_container element

        $dk = false,

        theme

      ;

      // Dont do anything if we've already setup dropkick on this element

      if (data.id) {

        return $select;

      } else {

        data.settings  = settings;

        data.tabindex  = tabindex;

        data.id        = id;

        data.$original = $original;

        data.$select   = $select;

        data.value     = _notBlank($select.val()) || _notBlank($original.attr('value'));

        data.label     = $original.text();

        data.options   = $options;

      }

      // Build the dropdown HTML

      $dk = _build(dropdownTemplate, data);

      // Make the dropdown fixed width if desired

      $dk.find('.dk_toggle').css({

        'width' : width + 'px'

      });

      // Hide the <select> list and place our new one in front of it

      $select.before($dk);

      // Update the reference to $dk

      $dk = $('#dk_container_' + id).fadeIn(settings.startSpeed);

      // Save the current theme

      theme = settings.theme ? settings.theme : 'default';

      $dk.addClass('dk_theme_' + theme);

      data.theme = theme;

      // Save the updated $dk reference into our data object

      data.$dk = $dk;

      // Save the dropkick data onto the <select> element

      $select.data('dropkick', data);

      // Do the same for the dropdown, but add a few helpers

      $dk.data('dropkick', data);

      lists[lists.length] = $select;

      // Focus events

      $dk.bind('focus.dropkick', function (e) {

        $dk.addClass('dk_focus');

      }).bind('blur.dropkick', function (e) {

        $dk.removeClass('dk_open dk_focus');

      });

      setTimeout(function () {

        $select.hide();

      }, 0);

    });

  };

  // Allows dynamic theme changes

  methods.theme = function (newTheme) {

    var

      $select   = $(this),

      list      = $select.data('dropkick'),

      $dk       = list.$dk,

      oldtheme  = 'dk_theme_' + list.theme

    ;

    $dk.removeClass(oldtheme).addClass('dk_theme_' + newTheme);

    list.theme = newTheme;

  };

  // Reset all <selects and dropdowns in our lists array

  methods.reset = function () {

    for (var i = 0, l = lists.length; i < l; i++) {

      var

        listData  = lists[i].data('dropkick'),

        $dk       = listData.$dk,

        $current  = $dk.find('li').first()

      ;

      $dk.find('.dk_label').text(listData.label);

      $dk.find('.dk_options_inner').animate({ scrollTop: 0 }, 0);

      _setCurrent($current, $dk);

      _updateFields($current, $dk, true);

    }

  };

  // Expose the plugin

  $.fn.dropkick = function (method) {

    if (!ie6) {

      if (methods[method]) {

        return methods[method].apply(this, Array.prototype.slice.call(arguments, 1));

      } else if (typeof method === 'object' || ! method) {

        return methods.init.apply(this, arguments);

      }

    }

  };

  // private

  function _handleKeyBoardNav(e, $dk) {

    var

      code     = e.keyCode,

      data     = $dk.data('dropkick'),

      options  = $dk.find('.dk_options'),

      open     = $dk.hasClass('dk_open'),

      current  = $dk.find('.dk_option_current'),

      first    = options.find('li').first(),

      last     = options.find('li').last(),

      next,

      prev

    ;

    switch (code) {

      case keyMap.enter:

        if (open) {

          _updateFields(current.find('a'), $dk);

          _closeDropdown($dk);

        } else {

          _openDropdown($dk);

        }

        e.preventDefault();

      break;

      case keyMap.up:

        prev = current.prev('li');

        if (open) {

          if (prev.length) {

            _setCurrent(prev, $dk);

          } else {

            _setCurrent(last, $dk);

          }

        } else {

          _openDropdown($dk);

        }

        e.preventDefault();

      break;

      case keyMap.down:

        if (open) {

          next = current.next('li').first();

          if (next.length) {

            _setCurrent(next, $dk);

          } else {

            _setCurrent(first, $dk);

          }

        } else {

          _openDropdown($dk);

        }

        e.preventDefault();

      break;

      default:

      break;

    }

  }

  // Update the <select> value, and the dropdown label

  function _updateFields(option, $dk, reset) {

    var value, label, data;

    value = option.attr('data-dk-dropdown-value');

    label = option.text();

    data  = $dk.data('dropkick');

    $select = data.$select;

    $select.val(value);

    $dk.find('.dk_label').text(label);

    reset = reset || false;

    if (data.settings.change && !reset) {

      data.settings.change.call($select, value, label);

    }

  }

  // Set the currently selected option

  function _setCurrent($current, $dk) {

    $dk.find('.dk_option_current').removeClass('dk_option_current');

    $current.addClass('dk_option_current');

    _setScrollPos($dk, $current);

  }

  function _setScrollPos($dk, anchor) {

    var height = anchor.prevAll('li').outerHeight() * anchor.prevAll('li').length;

    $dk.find('.dk_options_inner').animate({ scrollTop: height + 'px' }, 0);

  }

  // Close a dropdown

  function _closeDropdown($dk) {

    $dk.removeClass('dk_open');

  }

  // Open a dropdown

  function _openDropdown($dk) {

    var data = $dk.data('dropkick');

    $dk.find('.dk_options').css({ top : $dk.find('.dk_toggle').outerHeight() - 1 });

    $dk.toggleClass('dk_open');

  }

  /**

   * Turn the dropdownTemplate into a jQuery object and fill in the variables.

   */

  function _build (tpl, view) {

    var

      // Template for the dropdown

      template  = tpl,

      // Holder of the dropdowns options

      options   = [],

      $dk

    ;

    template = template.replace('{{ id }}', view.id);

    template = template.replace('{{ label }}', view.label);

    template = template.replace('{{ tabindex }}', view.tabindex);

    if (view.options && view.options.length) {

      for (var i = 0, l = view.options.length; i < l; i++) {

        var

          $option   = $(view.options[i]),

          current   = 'dk_option_current',

          oTemplate = optionTemplate

        ;

        oTemplate = oTemplate.replace('{{ value }}', $option.val());

        oTemplate = oTemplate.replace('{{ current }}', (_notBlank($option.val()) === view.value) ? current : '');

        oTemplate = oTemplate.replace('{{ text }}', $option.text());

        options[options.length] = oTemplate;

      }

    }

    $dk = $(template);

    $dk.find('.dk_options_inner').html(options.join(''));

    return $dk;

  }

  function _notBlank(text) {

    return ($.trim(text).length > 0) ? text : false;

  }

  $(function () {

    // Handle click events on the dropdown toggler

    $('.dk_toggle').live('click', function (e) {

      var $dk  = $(this).parents('.dk_container').first();

      _openDropdown($dk);

      if ("ontouchstart" in window) {

        $dk.addClass('dk_touch');

        $dk.find('.dk_options_inner').addClass('scrollable vertical');

      }

      e.preventDefault();

      return false;

    });

    // Handle click events on individual dropdown options

    $('.dk_options a').live(($.browser.msie ? 'mousedown' : 'click'), function (e) {

      var

        $option = $(this),

        $dk     = $option.parents('.dk_container').first(),

        data    = $dk.data('dropkick')

      ;

      _closeDropdown($dk);

      _updateFields($option, $dk);

      _setCurrent($option.parent(), $dk);

      e.preventDefault();

      return false;

    });

    // Setup keyboard nav

    $(document).bind('keydown.dk_nav', function (e) {

      var

        // Look for an open dropdown...

        $open    = $('.dk_container.dk_open'),

        // Look for a focused dropdown

        $focused = $('.dk_container.dk_focus'),

        // Will be either $open, $focused, or null

        $dk = null

      ;

      // If we have an open dropdown, key events should get sent to that one

      if ($open.length) {

        $dk = $open;

      } else if ($focused.length && !$open.length) {

        // But if we have no open dropdowns, use the focused dropdown instead

        $dk = $focused;

      }

      if ($dk) {

        _handleKeyBoardNav(e, $dk);

      }

    });

  });

})(jQuery, window, document);