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[aidenligne_francais_universite.git] / js / supersubs.js
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1
2/*
3 * Supersubs v0.2b - jQuery plugin
4 * Copyright (c) 2008 Joel Birch
5 *
6 * Dual licensed under the MIT and GPL licenses:
7 * http://www.opensource.org/licenses/mit-license.php
8 * http://www.gnu.org/licenses/gpl.html
9 *
10 *
11 * This plugin automatically adjusts submenu widths of suckerfish-style menus to that of
12 * their longest list item children. If you use this, please expect bugs and report them
13 * to the jQuery Google Group with the word 'Superfish' in the subject line.
14 *
15 */
16
17;(function($){ // $ will refer to jQuery within this closure
18
19 $.fn.supersubs = function(options){
20 var opts = $.extend({}, $.fn.supersubs.defaults, options);
21 // return original object to support chaining
22 return this.each(function() {
23 // cache selections
24 var $$ = $(this);
25 // support metadata
26 var o = $.meta ? $.extend({}, opts, $$.data()) : opts;
27 // get the font size of menu.
28 // .css('fontSize') returns various results cross-browser, so measure an em dash instead
29 var fontsize = $('<li id="menu-fontsize">&#8212;</li>').css({
30 'padding' : 0,
31 'position' : 'absolute',
32 'top' : '-999em',
33 'width' : 'auto'
34 }).appendTo($$).width(); //clientWidth is faster, but was incorrect here
35 // remove em dash
36 $('#menu-fontsize').remove();
37 // cache all ul elements
38 $ULs = $$.find('ul');
39 // loop through each ul in menu
40 $ULs.each(function(i) {
41 // cache this ul
42 var $ul = $ULs.eq(i);
43 // get all (li) children of this ul
44 var $LIs = $ul.children();
45 // get all anchor grand-children
46 var $As = $LIs.children('a');
47 // force content to one line and save current float property
48 var liFloat = $LIs.css('white-space','nowrap').css('float');
49 // remove width restrictions and floats so elements remain vertically stacked
50 var emWidth = $ul.add($LIs).add($As).css({
51 'float' : 'none',
52 'width' : 'auto'
53 })
54 // this ul will now be shrink-wrapped to longest li due to position:absolute
55 // so save its width as ems. Clientwidth is 2 times faster than .width() - thanks Dan Switzer
56 .end().end()[0].clientWidth / fontsize;
57 // add more width to ensure lines don't turn over at certain sizes in various browsers
58 emWidth += o.extraWidth;
59 // restrict to at least minWidth and at most maxWidth
60 if (emWidth > o.maxWidth) { emWidth = o.maxWidth; }
61 else if (emWidth < o.minWidth) { emWidth = o.minWidth; }
62 emWidth += 'em';
63 // set ul to width in ems
64 $ul.css('width',emWidth);
65 // restore li floats to avoid IE bugs
66 // set li width to full width of this ul
67 // revert white-space to normal
68 $LIs.css({
69 'float' : liFloat,
70 'width' : '100%',
71 'white-space' : 'normal'
72 })
73 // update offset position of descendant ul to reflect new width of parent
74 .each(function(){
75 var $childUl = $('>ul',this);
76 var offsetDirection = $childUl.css('left')!==undefined ? 'left' : 'right';
77 $childUl.css(offsetDirection,emWidth);
78 });
79 });
80
81 });
82 };
83 // expose defaults
84 $.fn.supersubs.defaults = {
85 minWidth : 9, // requires em unit.
86 maxWidth : 25, // requires em unit.
87 extraWidth : 0 // extra width can ensure lines don't sometimes turn over due to slight browser differences in how they round-off values
88 };
89
90})(jQuery); // plugin code ends