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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> |
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Learn more about bidirectional Unicode characters
<!DOCTYPE HTML> | |
<html> | |
<head> | |
<style> | |
* html body { | |
behavior:url("csshover.htc"); /* IE6: http://www.xs4all.nl/~peterned/csshover.html */ | |
} | |
.tree span:hover { | |
font-weight: bold; | |
} | |
.tree span { | |
cursor: pointer; | |
} | |
</style> | |
<meta charset="utf-8"> | |
</head> | |
<body> | |
<ul class="tree"> | |
<li>Животные | |
<ul> | |
<li>Млекопитающие | |
<ul> | |
<li>Коровы</li> | |
<li>Ослы</li> | |
<li>Собаки</li> | |
<li>Тигры</li> | |
</ul> | |
</li> | |
<li>Другие | |
<ul> | |
<li>Змеи</li> | |
<li>Птицы</li> | |
<li>Ящерицы</li> | |
</ul> | |
</li> | |
</ul> | |
</li> | |
<li>Рыбы | |
<ul> | |
<li>Аквариумные | |
<ul> | |
<li>Гуппи</li> | |
<li>Скалярии</li> | |
</ul> | |
</li> | |
<li>Морские | |
<ul> | |
<li>Морская форель</li> | |
</ul> | |
</li> | |
</ul> | |
</li> | |
</ul> | |
<script> | |
var tree = document.getElementsByTagName('ul')[0]; | |
var treeLis = tree.getElementsByTagName('li'); | |
/* wrap all textNodes into spans */ | |
for(var i=0; i<treeLis.length; i++) { | |
var li = treeLis[i]; | |
var span = document.createElement('span'); | |
li.insertBefore(span, li.firstChild); | |
span.appendChild(span.nextSibling); | |
} | |
/* catch clicks on whole tree */ | |
tree.onclick = function(evt) { | |
evt = evt || window.event; | |
var target = evt.target || evt.srcElement; | |
if (target.tagName != 'SPAN') { | |
return; | |
} | |
/* now we know SPAN is clicked */ | |
var node = target.parentNode.getElementsByTagName('ul')[0]; | |
if (!node) return; // no children | |
node.style.display = node.style.display ? '' : 'none'; | |
} | |
tree.onselectstart = tree.onmousedown = function() { | |
return false; // делаем узлы невыделяемыми | |
} | |
</script> | |
</body> | |
</html> |
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