supersubs.js

/*
 * Supersubs v0.4b - jQuery plugin
 * Copyright (c) 2013 Joel Birch
 *
 * Dual licensed under the MIT and GPL licenses:
 *  http://www.opensource.org/licenses/mit-license.php
 *  http://www.gnu.org/licenses/gpl.html
 *
 * This plugin automatically adjusts submenu widths of suckerfish-style menus to that of
 * their longest list item children. If you use this, please expect bugs and report them
 * to the jQuery Google Group with the word 'Superfish' in the subject line.
 *
 */
/*
 * This is not the original jQuery Supersubs plugin.
 * Please refer to the README for more information.
 */

(function($){ // $ will refer to jQuery within this closure
  $.fn.supersubs = function(options){
    var opts = $.extend({}, $.fn.supersubs.defaults, options);
    // return original object to support chaining
    // Although this is unnecessary due to the way the module uses these plugins.
    for (var a = 0; a < this.length; a++) {
      // cache selections
      var $$ = $(this).eq(a),
      // support metadata
      o = $.meta ? $.extend({}, opts, $$.data()) : opts;
      // Jump one level if it's a "NavBar"
      if ($$.hasClass('sf-navbar')) {
        $$ = $$.children('li').children('ul');
      }
      // cache all ul elements
      var $ULs = $$.find('ul');
      if ($ULs.length) {
        // get the font size of menu.
        // .css('fontSize') returns various results cross-browser, so measure an em dash instead
        var fontsize = $('<li id="menu-fontsize">&#8212;</li>'),
        size = fontsize.attr('style','padding:0;position:absolute;top:-99999em;width:auto;')
        .appendTo($$)[0].clientWidth; //clientWidth is faster than width()
        // remove em dash
        fontsize.remove();

        // loop through each ul in menu
        for (var b = 0; b < $ULs.length; b++) {
          var
          // cache this ul
          $ul = $ULs.eq(b);
          // If a multi-column sub-menu, and only if correctly configured.
          if (o.multicolumn && $ul.hasClass('sf-multicolumn') && $ul.find('.sf-multicolumn-column').length > 0){
            // Look through each column.
            var $column = $ul.find('div.sf-multicolumn-column > ol'),
            // Overall width.
            mwWidth = 0;
            for (var d = 0; d < $column.length; d++){
              resize($column.eq(d));
              // New column width, in pixels.
              var colWidth = Math.ceil($column.width());
              // Just a trick to convert em unit to px.
              $column.css({width:colWidth})
              // Making column parents the same size.
              .parents('.sf-multicolumn-column').css({width:colWidth});
              // Overall width.
              mwWidth += colWidth;
            }
            // Resizing the columns container too.
            $ul.add($ul.find('li.sf-multicolumn-wrapper, li.sf-multicolumn-wrapper > ol')).css({width:mwWidth});
          }
          else {
            resize($ul);
          }
        }
      }
    }
    function resize($ul){
      var
      // get all (li) children of this ul
      $LIs = $ul.children(),
      // get all anchor grand-children
      $As = $LIs.children('a');
      // force content to one line and save current float property
      $LIs.css('white-space','nowrap');
      // remove width restrictions and floats so elements remain vertically stacked
      $ul.add($LIs).add($As).css({float:'none',width:'auto'});
      // this ul will now be shrink-wrapped to longest li due to position:absolute
      // so save its width as ems.
      var emWidth = $ul.get(0).clientWidth / size;
      // add more width to ensure lines don't turn over at certain sizes in various browsers
      emWidth += o.extraWidth;
      // restrict to at least minWidth and at most maxWidth
      if (emWidth > o.maxWidth) {emWidth = o.maxWidth;}
      else if (emWidth < o.minWidth) {emWidth = o.minWidth;}
      emWidth += 'em';
      // set ul to width in ems
      $ul.css({width:emWidth});
      // restore li floats to avoid IE bugs
      // set li width to full width of this ul
      // revert white-space to normal
      $LIs.add($As).css({float:'',width:'',whiteSpace:''});
      // update offset position of descendant ul to reflect new width of parent.
      // set it to 100% in case it isn't already set to this in the CSS
      for (var c = 0; c < $LIs.length; c++) {
        var $childUl = $LIs.eq(c).children('ul');
        var offsetDirection = $childUl.css('left') !== undefined ? 'left' : 'right';
        $childUl.css(offsetDirection,'100%');
      }
    }
    return this;
  };
  // expose defaults
  $.fn.supersubs.defaults = {
    multicolumn: true, // define width for multi-column sub-menus and their columns.
    minWidth: 12, // requires em unit.
    maxWidth: 27, // requires em unit.
    extraWidth: 1 // extra width can ensure lines don't sometimes turn over due to slight browser differences in how they round-off values
  };
})(jQuery); // plugin code ends