source: branches/2.0/template-common/csshover.htc @ 18080

<attach event="ondocumentready" handler="parseStylesheets" />
<script>
/**
 *      Whatever:hover - V1.42.060206 - hover & active
 *      ------------------------------------------------------------
 *      (c) 2005 - Peter Nederlof
 *      Peterned - http://www.xs4all.nl/~peterned/
 *      License  - http://creativecommons.org/licenses/LGPL/2.1/
 *
 *      Whatever:hover is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU Lesser General Public
 *      License as published by the Free Software Foundation; either
 *      version 2.1 of the License, or (at your option) any later version.
 *
 *      Whatever:hover is distributed in the hope that it will be useful,
 *      but WITHOUT ANY WARRANTY; without even the implied warranty of
 *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 *      Lesser General Public License for more details.
 *
 *      Credits and thanks to:
 *      Arnoud Berendsen, Martin Reurings, Robert Hanson
 *
 *      howto: body { behavior:url("csshover.htc"); }
 *      ------------------------------------------------------------
 */

var csshoverReg = /(^|\s)(([^a]([^ ]+)?)|(a([^#.][^ ]+)+)):(hover|active)/i,
currentSheet, doc = window.document, hoverEvents = [], activators = {
        onhover:{on:'onmouseover', off:'onmouseout'},
        onactive:{on:'onmousedown', off:'onmouseup'}
}

function parseStylesheets() {
        if(!/MSIE (5|6)/.test(navigator.userAgent)) return;
        window.attachEvent('onunload', unhookHoverEvents);
        var sheets = doc.styleSheets, l = sheets.length;
        for(var i=0; i<l; i++) 
                parseStylesheet(sheets[i]);
}
        function parseStylesheet(sheet) {
                if(sheet.imports) {
                        try {
                                var imports = sheet.imports, l = imports.length;
                                for(var i=0; i<l; i++) parseStylesheet(sheet.imports[i]);
                        } catch(securityException){}
                }

                try {
                        var rules = (currentSheet = sheet).rules, l = rules.length;
                        for(var j=0; j<l; j++) parseCSSRule(rules[j]);
                } catch(securityException){}
        }

        function parseCSSRule(rule) {
                var select = rule.selectorText, style = rule.style.cssText;
                if(!csshoverReg.test(select) || !style) return;

                var pseudo = select.replace(/[^:]+:([a-z-]+).*/i, 'on$1');
                var newSelect = select.replace(/(\.([a-z0-9_-]+):[a-z]+)|(:[a-z]+)/gi, '.$2' + pseudo);
                var className = (/\.([a-z0-9_-]*on(hover|active))/i).exec(newSelect)[1];
                var affected = select.replace(/:(hover|active).*$/, '');
                var elements = getElementsBySelect(affected);
                if(elements.length == 0) return;

                currentSheet.addRule(newSelect, style);
                for(var i=0; i<elements.length; i++)
                        new HoverElement(elements[i], className, activators[pseudo]);
        }

function HoverElement(node, className, events) {
        if(!node.hovers) node.hovers = {};
        if(node.hovers[className]) return;
        node.hovers[className] = true;
        hookHoverEvent(node, events.on, function() { node.className += ' ' + className; });
        hookHoverEvent(node, events.off, function() { node.className = node.className.replace(new RegExp('\\s+'+className, 'g'),''); });
}
        function hookHoverEvent(node, type, handler) {
                node.attachEvent(type, handler);
                hoverEvents[hoverEvents.length] = { 
                        node:node, type:type, handler:handler 
                };
        }

        function unhookHoverEvents() {
                for(var e,i=0; i<hoverEvents.length; i++) {
                        e = hoverEvents[i]; 
                        e.node.detachEvent(e.type, e.handler);
                }
        }

function getElementsBySelect(rule) {
        var parts, nodes = [doc];
        parts = rule.split(' ');
        for(var i=0; i<parts.length; i++) {
                nodes = getSelectedNodes(parts[i], nodes);
        }       return nodes;
}
        function getSelectedNodes(select, elements) {
                var result, node, nodes = [];
                var identify = (/\#([a-z0-9_-]+)/i).exec(select);
                if(identify) {
                        var element = doc.getElementById(identify[1]);
                        return element? [element]:nodes;
                }
                
                var classname = (/\.([a-z0-9_-]+)/i).exec(select);
                var tagName = select.replace(/(\.|\#|\:)[a-z0-9_-]+/i, '');
                var classReg = classname? new RegExp('\\b' + classname[1] + '\\b'):false;
                for(var i=0; i<elements.length; i++) {
                        result = tagName? elements[i].all.tags(tagName):elements[i].all; 
                        for(var j=0; j<result.length; j++) {
                                node = result[j];
                                if(classReg && !classReg.test(node.className)) continue;
                                nodes[nodes.length] = node;
                        }
                }       
                
                return nodes;
        }
</script>