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-<public:attach event="ondocumentready" onevent="CSSHover()" />
-<script>
-/**
- * Whatever:hover - V3.11
- * ------------------------------------------------------------
- * Author - Peter Nederlof, http://www.xs4all.nl/~peterned
- * License - http://creativecommons.org/licenses/LGPL/2.1
- *
- * Special thanks to Sergiu Dumitriu, http://purl.org/net/sergiu,
- * for fixing the expression loop.
- *
- * 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.
- *
- * howto: body { behavior:url("csshover3.htc"); }
- * ------------------------------------------------------------
- */
-
-window.CSSHover = (function(){
-
- // regular expressions, used and explained later on.
- var REG_INTERACTIVE = /(^|\s)((([^a]([^ ]+)?)|(a([^#.][^ ]+)+)):(hover|active|focus))/i;
- var REG_AFFECTED = /(.*?)\:(hover|active|focus)/i;
- var REG_PSEUDO = /[^:]+:([a-z\-]+).*/i;
- var REG_SELECT = /(\.([a-z0-9_\-]+):[a-z]+)|(:[a-z]+)/gi;
- var REG_CLASS = /\.([a-z0-9_\-]*on(hover|active|focus))/i;
- var REG_MSIE = /msie (5|6|7)/i;
- var REG_COMPAT = /backcompat/i;
-
- // property mapping, real css properties must be used in order to clear expressions later on...
- // Uses obscure css properties that no-one is likely to use. The properties are borrowed to
- // set an expression, and are then restored to the most likely correct value.
- var Properties = {
- index: 0,
- list: ['text-kashida', 'text-kashida-space', 'text-justify'],
- get: function() {
- return this.list[(this.index++)%this.list.length];
- }
- };
-
- // camelize is used to convert css properties from (eg) text-kashida to textKashida
- var camelize = function(str) {
- return str.replace(/-(.)/mg, function(result, match){
- return match.toUpperCase();
- });
- };
-
- /**
- * Local CSSHover object
- * --------------------------
- */
-
- var CSSHover = {
-
- // array of CSSHoverElements, used to unload created events
- elements: [],
-
- // buffer used for checking on duplicate expressions
- callbacks: {},
-
- // init, called once ondomcontentready via the exposed window.CSSHover function
- init:function() {
- // don't run in IE8 standards; expressions don't work in standards mode anyway,
- // and the stuff we're trying to fix should already work properly
- if(!REG_MSIE.test(navigator.userAgent) && !REG_COMPAT.test(window.document.compatMode)) {
- return;
- }
-
- // start parsing the existing stylesheets
- var sheets = window.document.styleSheets, l = sheets.length;
- for(var i=0; i<l; i++) {
- this.parseStylesheet(sheets[i]);
- }
- },
-
- // called from init, parses individual stylesheets
- parseStylesheet:function(sheet) {
- // check sheet imports and parse those recursively
- if(sheet.imports) {
- try {
- var imports = sheet.imports;
- var l = imports.length;
- for(var i=0; i<l; i++) {
- this.parseStylesheet(sheet.imports[i]);
- }
- } catch(securityException){
- // trycatch for various possible errors
- }
- }
-
- // interate the sheet's rules and send them to the parser
- try {
- var rules = sheet.rules;
- var r = rules.length;
- for(var j=0; j<r; j++) {
- this.parseCSSRule(rules[j], sheet);
- }
- } catch(someException){
- // trycatch for various errors, most likely accessing the sheet's rules.
- }
- },
-
- // magic starts here ...
- parseCSSRule:function(rule, sheet) {
-
- // The sheet is used to insert new rules into, this must be the same sheet the rule
- // came from, to ensure that relative paths keep pointing to the right location.
-
- // only parse a rule if it contains an interactive pseudo.
- var select = rule.selectorText;
- if(REG_INTERACTIVE.test(select)) {
- var style = rule.style.cssText;
-
- // affected elements are found by truncating the selector after the interactive pseudo,
- // eg: "div li:hover" >> "div li"
- var affected = REG_AFFECTED.exec(select)[1];
-
- // that pseudo is needed for a classname, and defines the type of interaction (focus, hover, active)
- // eg: "li:hover" >> "onhover"
- var pseudo = select.replace(REG_PSEUDO, 'on$1');
-
- // the new selector is going to use that classname in a new css rule,
- // since IE6 doesn't support multiple classnames, this is merged into one classname
- // eg: "li:hover" >> "li.onhover", "li.folder:hover" >> "li.folderonhover"
- var newSelect = select.replace(REG_SELECT, '.$2' + pseudo);
-
- // the classname is needed for the events that are going to be set on affected nodes
- // eg: "li.folder:hover" >> "folderonhover"
- var className = REG_CLASS.exec(newSelect)[1];
-
- // no need to set the same callback more than once when the same selector uses the same classname
- var hash = affected + className;
- if(!this.callbacks[hash]) {
-
- // affected elements are given an expression under a borrowed css property, because fake properties
- // can't have their expressions cleared. Different properties are used per pseudo, to avoid
- // expressions from overwriting eachother. The expression does a callback to CSSHover.patch,
- // rerouted via the exposed window.CSSHover function.
- var property = Properties.get();
- var atRuntime = camelize(property);
-
- // because the expression is added to the stylesheet, and styles are always applied to html that is
- // dynamically added to the dom, the expression will also trigger for those new elements (provided
- // they are selected by the affected selector).
- sheet.addRule(affected, property + ':expression(CSSHover(this, "'+pseudo+'", "'+className+'", "'+atRuntime+'"))');
-
- // hash it, so an identical selector/class combo does not duplicate the expression
- this.callbacks[hash] = true;
- }
-
- // duplicate expressions need not be set, but the style could differ
- sheet.addRule(newSelect, style);
- }
- },
-
- // called via the expression, patches individual nodes
- patch:function(node, type, className, property) {
-
- // restores the borrowed css property to the value of its immediate parent, clearing
- // the expression so that it's not repeatedly called.
- try {
- var value = node.parentNode.currentStyle[property];
- node.style[property] = value;
- } catch(e) {
- // the above reset should never fail, but just in case, clear the runtimeStyle if it does.
- // this will also stop the expression.
- node.runtimeStyle[property] = '';
- }
-
- // just to make sure, also keep track of patched classnames locally on the node
- if(!node.csshover) {
- node.csshover = [];
- }
-
- // and check for it to prevent duplicate events with the same classname from being set
- if(!node.csshover[className]) {
- node.csshover[className] = true;
-
- // create an instance for the given type and class
- var element = new CSSHoverElement(node, type, className);
-
- // and store that instance for unloading later on
- this.elements.push(element);
- }
-
- // returns a dummy value to the expression
- return type;
- },
-
- // unload stuff onbeforeunload
- unload:function() {
- try {
-
- // remove events
- var l = this.elements.length;
- for(var i=0; i<l; i++) {
- this.elements[i].unload();
- }
-
- // and set properties to null
- this.elements = [];
- this.callbacks = {};
-
- } catch (e) {
- }
- }
- };
-
- /**
- * CSSHoverElement
- * --------------------------
- */
-
- // the event types associated with the interactive pseudos
- var CSSEvents = {
- onhover: { activator: 'onmouseenter', deactivator: 'onmouseleave' },
- onactive: { activator: 'onmousedown', deactivator: 'onmouseup' },
- onfocus: { activator: 'onfocus', deactivator: 'onblur' }
- };
-
- // CSSHoverElement constructor, called via CSSHover.patch
- function CSSHoverElement(node, type, className) {
-
- // the CSSHoverElement patches individual nodes by manually applying the events that should
- // have fired by the css pseudoclasses, eg mouseenter and mouseleave for :hover.
-
- this.node = node;
- this.type = type;
- var replacer = new RegExp('(^|\\s)'+className+'(\\s|$)', 'g');
-
- // store event handlers for removal onunload
- this.activator = function(){ node.className += ' ' + className; };
- this.deactivator = function(){ node.className = node.className.replace(replacer, ' '); };
-
- // add the events
- node.attachEvent(CSSEvents[type].activator, this.activator);
- node.attachEvent(CSSEvents[type].deactivator, this.deactivator);
- }
-
- CSSHoverElement.prototype = {
- // onbeforeunload, called via CSSHover.unload
- unload:function() {
-
- // remove events
- this.node.detachEvent(CSSEvents[this.type].activator, this.activator);
- this.node.detachEvent(CSSEvents[this.type].deactivator, this.deactivator);
-
- // and set properties to null
- this.activator = null;
- this.deactivator = null;
- this.node = null;
- this.type = null;
- }
- };
-
- // add the unload to the onbeforeunload event
- window.attachEvent('onbeforeunload', function(){
- CSSHover.unload();
- });
-
- /**
- * Public hook
- * --------------------------
- */
-
- return function(node, type, className, property) {
- if(node) {
- // called via the css expression; patches individual nodes
- return CSSHover.patch(node, type, className, property);
- } else {
- // called ondomcontentready via the public:attach node
- CSSHover.init();
- }
- };
-
-})();
-</script> \ No newline at end of file
generated by cgit v1.2.1 (git 2.21.0) at 2024-11-23 10:19:25 +0000