/*
// jQuery multiSelect
//
// Version 1.0.2 beta
//
// Cory S.N. LaViska
// A Beautiful Site (http://abeautifulsite.net/)
// 10 May 2009
//
// Visit http://abeautifulsite.net/notebook.php?article=62 for more information
//
// Usage: $('#control_id').multiSelect( options, callback )
//
// Options:  selectAll          - whether or not to display the Select All option; true/false, default = true
//           selectAllText      - text to display for selecting/unselecting all options simultaneously
//           noneSelected       - text to display when there are no selected items in the list
//           oneOrMoreSelected  - text to display when there are one or more selected items in the list
//                                (note: you can use % as a placeholder for the number of items selected).
//                                Use * to show a comma separated list of all selected; default = '% selected'
//
// Dependencies:  jQuery 1.2.6 or higher (http://jquery.com/)
//
// Change Log:
//
//    1.0.1 - Updated to work with jQuery 1.2.6+ (no longer requires the dimensions plugin)
//        - Changed $(this).offset() to $(this).position(), per James' and Jono's suggestions
//
//    1.0.2 - Fixed issue where dropdown doesn't scroll up/down with keyboard shortcuts
//        - Changed '$' in setTimeout to use 'jQuery' to support jQuery.noConflict
//        - Renamed from jqueryMultiSelect.* to jquery.multiSelect.* per the standard recommended at
//          http://docs.jquery.com/Plugins/Authoring (does not affect API methods)
//
// Licensing & Terms of Use
//
// This plugin is dual-licensed under the GNU General Public License and the MIT License and
// is copyright 2008 A Beautiful Site, LLC.
//
*/
if(jQuery) (function($){

  $.extend($.fn, {
    multiSelect: function(o, callback) {
      // Default options
      if( !o ) var o = {};
      if( o.selectAll == undefined ) o.selectAll = true;
      if( o.selectAllText == undefined ) o.selectAllText = "Alle wählen";
      if( o.noneSelected == undefined ) o.noneSelected = 'Auswahl';
      if( o.oneOrMoreSelected == undefined ) o.oneOrMoreSelected = '% ausgewählt';

      // Initialize each multiSelect
      $(this).each( function() {
        var select = $(this);
        var html = '<input type="text" readonly="readonly" class="multiSelect" value="" style="cursor: default;" />';
        html += '<div class="multiSelectOptions" style="position: absolute; z-index: 99999; display: none;">';
        if( o.selectAll ) html += '<label class="selectAll"><input type="checkbox" class="selectAll" />' + o.selectAllText + '</label>';
        $(select).find('OPTION').each( function() {
          if( $(this).val() != '' ) {
            html += '<label><input type="checkbox" name="' + $(select).attr('name') + '" value="' + $(this).val() + '"';
            if( $(this).attr('selected') ) html += ' checked="checked"';
            html += ' />' + $(this).html() + '</label>';
          }
        });
        html += '</div>';
        $(select).after(html);

        // Events
        $(select).next('.multiSelect').mouseover( function() {
          $(this).addClass('hover');
        }).mouseout( function() {
          $(this).removeClass('hover');
        }).click( function() {
          // Show/hide on click
          if( $(this).hasClass('active') ) {
            $(this).multiSelectOptionsHide();
          } else {
            $(this).multiSelectOptionsShow();
          }
          return false;
        }).focus( function() {
          // So it can be styled with CSS
          $(this).addClass('focus');
        }).blur( function() {
          // So it can be styled with CSS
          $(this).removeClass('focus');
        });

        // Determine if Select All should be checked initially
        if( o.selectAll ) {
          var sa = true;
          $(select).next('.multiSelect').next('.multiSelectOptions').find('INPUT:checkbox').not('.selectAll').each( function() {
            if( !$(this).attr('checked') ) sa = false;
          });
          if( sa ) $(select).next('.multiSelect').next('.multiSelectOptions').find('INPUT.selectAll').attr('checked', true).parent().addClass('checked');
        }

        // Handle Select All
        $(select).next('.multiSelect').next('.multiSelectOptions').find('INPUT.selectAll').click( function() {
          if( $(this).attr('checked') == true ) $(this).parent().parent().find('INPUT:checkbox').attr('checked', true).parent().addClass('checked'); else $(this).parent().parent().find('INPUT:checkbox').attr('checked', false).parent().removeClass('checked');
        });

        // Handle checkboxes
        $(select).next('.multiSelect').next('.multiSelectOptions').find('INPUT:checkbox').click( function() {
          $(this).parent().parent().multiSelectUpdateSelected(o);
          $(this).parent().parent().find('LABEL').removeClass('checked').find('INPUT:checked').parent().addClass('checked');
          $(this).parent().parent().prev('.multiSelect').focus();
          if( !$(this).attr('checked') ) $(this).parent().parent().find('INPUT:checkbox.selectAll').attr('checked', false).parent().removeClass('checked');
          if( callback ) callback($(this));
        });

        // Initial display
        $(select).next('.multiSelect').next('.multiSelectOptions').each( function() {
          $(this).multiSelectUpdateSelected(o);
          $(this).find('INPUT:checked').parent().addClass('checked');
        });

        // Handle hovers
        $(select).next('.multiSelect').next('.multiSelectOptions').find('LABEL').mouseover( function() {
          $(this).parent().find('LABEL').removeClass('hover');
          $(this).addClass('hover');
        }).mouseout( function() {
          $(this).parent().find('LABEL').removeClass('hover');
        });

        // Keyboard
        $(select).next('.multiSelect').keydown( function(e) {
          // Is dropdown visible?
          if( $(this).next('.multiSelectOptions').is(':visible') ) {
            // Dropdown is visible
            // Tab
            if( e.keyCode == 9 ) {
              $(this).addClass('focus').trigger('click'); // esc, left, right - hide
              $(this).focus().next(':input').focus();
              return true;
            }

            // ESC, Left, Right
            if( e.keyCode == 27 || e.keyCode == 37 || e.keyCode == 39 ) {
              // Hide dropdown
              $(this).addClass('focus').trigger('click');
            }
            // Down
            if( e.keyCode == 40 ) {
              if( !$(this).next('.multiSelectOptions').find('LABEL').hasClass('hover') ) {
                // Default to first item
                $(this).next('.multiSelectOptions').find('LABEL:first').addClass('hover');
              } else {
                // Move down, cycle to top if on bottom
                $(this).next('.multiSelectOptions').find('LABEL.hover').removeClass('hover').next('LABEL').addClass('hover');
                if( !$(this).next('.multiSelectOptions').find('LABEL').hasClass('hover') ) {
                  $(this).next('.multiSelectOptions').find('LABEL:first').addClass('hover');
                }
              }

              // Adjust the viewport if necessary
              $(this).multiSelectAdjustViewport($(this) );

              return false;
            }
            // Up
            if( e.keyCode == 38 ) {
              if( !$(this).next('.multiSelectOptions').find('LABEL').hasClass('hover') ) {
                // Default to first item
                $(this).next('.multiSelectOptions').find('LABEL:first').addClass('hover');
              } else {
                // Move up, cycle to bottom if on top
                $(this).next('.multiSelectOptions').find('LABEL.hover').removeClass('hover').prev('LABEL').addClass('hover');
                if( !$(this).next('.multiSelectOptions').find('LABEL').hasClass('hover') ) {
                  $(this).next('.multiSelectOptions').find('LABEL:last').addClass('hover');
                }
              }

              // Adjust the viewport if necessary
              $(this).multiSelectAdjustViewport($(this) );

              return false;
            }
            // Enter, Space
            if( e.keyCode == 13 || e.keyCode == 32 ) {
              // Select All
              if( $(this).next('.multiSelectOptions').find('LABEL.hover INPUT:checkbox').hasClass('selectAll') ) {
                if( $(this).next('.multiSelectOptions').find('LABEL.hover INPUT:checkbox').attr('checked') ) {
                  // Uncheck all
                  $(this).next('.multiSelectOptions').find('INPUT:checkbox').attr('checked', false).parent().removeClass('checked');
                } else {
                  // Check all
                  $(this).next('.multiSelectOptions').find('INPUT:checkbox').attr('checked', true).parent().addClass('checked');
                }
                $(this).next('.multiSelectOptions').multiSelectUpdateSelected(o);
                if( callback ) callback($(this));
                return false;
              }
              // Other checkboxes
              if( $(this).next('.multiSelectOptions').find('LABEL.hover INPUT:checkbox').attr('checked') ) {
                // Uncheck
                $(this).next('.multiSelectOptions').find('LABEL.hover INPUT:checkbox').attr('checked', false);
                $(this).next('.multiSelectOptions').multiSelectUpdateSelected(o);
                $(this).next('.multiSelectOptions').find('LABEL').removeClass('checked').find('INPUT:checked').parent().addClass('checked');
                // Select all status can't be checked at this point
                $(this).next('.multiSelectOptions').find('INPUT:checkbox.selectAll').attr('checked', false).parent().removeClass('checked');
                if( callback ) callback($(this));
              } else {
                // Check
                $(this).next('.multiSelectOptions').find('LABEL.hover INPUT:checkbox').attr('checked', true);
                $(this).next('.multiSelectOptions').multiSelectUpdateSelected(o);
                $(this).next('.multiSelectOptions').find('LABEL').removeClass('checked').find('INPUT:checked').parent().addClass('checked');
                if( callback ) callback($(this));
              }
            }
            return false;
          } else {
            // Dropdown is not visible
            if( e.keyCode == 38 || e.keyCode == 40 || e.keyCode == 13 || e.keyCode == 32 ) { // down, enter, space - show
              // Show dropdown
              $(this).removeClass('focus').trigger('click');
              $(this).next('.multiSelectOptions').find('LABEL:first').addClass('hover');
              return false;
            }
            //  Tab key
            if( e.keyCode == 9 ) {
              // Shift focus to next INPUT element on page
              $(this).focus().next(':input').focus();
              return true;
            }
          }
          // Prevent enter key from submitting form
          if( e.keyCode == 13 ) return false;
        });

        // Eliminate the original form element
        $(select).remove();
      });

    },

    // Hide the dropdown
    multiSelectOptionsHide: function() {
      $(this).removeClass('active').next('.multiSelectOptions').hide();
    },

    // Show the dropdown
    multiSelectOptionsShow: function() {
      // Hide any open option boxes
      $('.multiSelect').multiSelectOptionsHide();
      $(this).next('.multiSelectOptions').find('LABEL').removeClass('hover');
      $(this).addClass('active').next('.multiSelectOptions').show();

      // Position it
      var offset = $(this).position();
      $(this).next('.multiSelectOptions').css({ top:  offset.top + $(this).outerHeight() + 'px' });
      $(this).next('.multiSelectOptions').css({ left: offset.left + 'px' });

      // Disappear on hover out
      multiSelectCurrent = $(this);
      var timer = '';
      $(this).next('.multiSelectOptions').hover( function() {
        clearTimeout(timer);
      }, function() {
        timer = setTimeout('jQuery(multiSelectCurrent).multiSelectOptionsHide(); $(multiSelectCurrent).unbind("hover");', 250);
      });

    },

    // Update the textbox with the total number of selected items
    multiSelectUpdateSelected: function(o) {
      var i = 0, s = '';
      $(this).find('INPUT:checkbox:checked').not('.selectAll').each( function() {
        i++;
      })
      if( i == 0 ) {
        $(this).prev('INPUT.multiSelect').val( o.noneSelected );
      } else {
        if( o.oneOrMoreSelected == '*' ) {
          var display = '';
          $(this).find('INPUT:checkbox:checked').each( function() {
            if( $(this).parent().text() != o.selectAllText ) display = display + $(this).parent().text() + ', ';
          });
          display = display.substr(0, display.length - 2);
          $(this).prev('INPUT.multiSelect').val( display );
        } else {
          $(this).prev('INPUT.multiSelect').val( o.oneOrMoreSelected.replace('%', i) );
        }
      }
    },

    // Ensures that the selected item is always in the visible portion of the dropdown (for keyboard controls)
    multiSelectAdjustViewport: function(el) {
      // Calculate positions of elements
      var i = 0;
      var selectionTop = 0, selectionHeight = 0;
      $(el).next('.multiSelectOptions').find('LABEL').each( function() {
        if( $(this).hasClass('hover') ) { selectionTop = i; selectionHeight = $(this).outerHeight(); return; }
        i += $(this).outerHeight();
      });
      var divScroll = $(el).next('.multiSelectOptions').scrollTop();
      var divHeight = $(el).next('.multiSelectOptions').height();
      // Adjust the dropdown scroll position
      $(el).next('.multiSelectOptions').scrollTop(selectionTop - ((divHeight / 2) - (selectionHeight / 2)));
    }

  });

})(jQuery);