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/**
* @class YAHOO.ext.util.CSS
* Class for manipulating CSS Rules
* @singleton
*/
YAHOO.ext.util.CSS = new function(){
var rules = null;
var toCamel = function(property) {
var convert = function(prop) {
var test = /(-[a-z])/i.exec(prop);
return prop.replace(RegExp.$1, RegExp.$1.substr(1).toUpperCase());
};
while(property.indexOf('-') > -1) {
property = convert(property);
}
return property;
};
/**
* Very simple dynamic creation of stylesheets from a text blob of rules.
* @param {String} cssText The text containing the css rules
* @return {StyleSheet}
*/
this.createStyleSheet = function(cssText){
var ss;
if(YAHOO.ext.util.Browser.isIE){
ss = document.createStyleSheet();
ss.cssText = cssText;
}else{
var head = document.getElementsByTagName("head")[0];
var rules = document.createElement('style');
rules.setAttribute('type', 'text/css');
try{
rules.appendChild(document.createTextNode(cssText));
}catch(e){
rules.cssText = cssText;
}
head.appendChild(rules);
ss = document.styleSheets[document.styleSheets.length-1];
}
this.cacheStyleSheet(ss);
return ss;
};
this.removeStyleSheet = function(id){
var existing = document.getElementById(id);
if(existing){
existing.parentNode.removeChild(existing);
}
};
this.swapStyleSheet = function(id, url){
this.removeStyleSheet(id);
var ss = document.createElement('link');
ss.setAttribute('rel', 'stylesheet');
ss.setAttribute('type', 'text/css');
ss.setAttribute('id', id);
ss.setAttribute('href', url);
document.getElementsByTagName("head")[0].appendChild(ss);
};
/**
* Refresh the rule cache if you have dynamically added stylesheets
* @return {Object} An object (hash) of rules indexed by selector
*/
this.refreshCache = function(){
return this.getRules(true);
};
this.cacheStyleSheet = function(ss){
try{// try catch for cross domain access issue
var ssRules = ss.cssRules || ss.rules;
for(var j = ssRules.length-1; j >= 0; --j){
rules[ssRules[j].selectorText] = ssRules[j];
}
}catch(e){}
};
/**
* Gets all css rules for the document
* @param {Boolean} refreshCache true to refresh the internal cache
* @return {Object} An object (hash) of rules indexed by selector
*/
this.getRules = function(refreshCache){
if(rules == null || refreshCache){
rules = {};
var ds = document.styleSheets;
for(var i =0, len = ds.length; i < len; i++){
try{
this.cacheStyleSheet(ds[i]);
}catch(e){}
}
}
return rules;
};
/**
* Gets an an individual CSS rule by selector(s)
* @param {String/Array} selector The CSS selector or an array of selectors to try. The first selector that is found is returned.
* @param {Boolean} refreshCache true to refresh the internal cache
* @return {CSSRule} The CSS rule or null if one is not found
*/
this.getRule = function(selector, refreshCache){
var rs = this.getRules(refreshCache);
if(!(selector instanceof Array)){
return rs[selector];
}
for(var i = 0; i < selector.length; i++){
if(rs[selector[i]]){
return rs[selector[i]];
}
}
return null;
};
/**
* Updates a rule property
* @param {String/Array} selector If it's an array it tries each selector until it finds one. Stops immediately once one is found.
* @param {String} property The css property
* @param {String} value The new value for the property
* @return {Boolean} true if a rule was found and updated
*/
this.updateRule = function(selector, property, value){
if(!(selector instanceof Array)){
var rule = this.getRule(selector);
if(rule){
rule.style[toCamel(property)] = value;
return true;
}
}else{
for(var i = 0; i < selector.length; i++){
if(this.updateRule(selector[i], property, value)){
return true;
}
}
}
return false;
};
/**
* Applies a rule to an element without adding the class
* @param {HTMLElement} el The element
* @param {String/Array} selector If it's an array it tries each selector until it finds one. Stops immediately once one is found.
* @return {Boolean} true if a rule was found and applied
*/
this.apply = function(el, selector){
if(!(selector instanceof Array)){
var rule = this.getRule(selector);
if(rule){
var s = rule.style;
for(var key in s){
if(typeof s[key] != 'function'){
if(s[key] && String(s[key]).indexOf(':') < 0 && s[key] != 'false'){
try{el.style[key] = s[key];}catch(e){}
}
}
}
return true;
}
}else{
for(var i = 0; i < selector.length; i++){
if(this.apply(el, selector[i])){
return true;
}
}
}
return false;
};
this.applyFirst = function(el, id, selector){
var selectors = [
'#' + id + ' ' + selector,
selector
];
return this.apply(el, selectors);
};
this.revert = function(el, selector){
if(!(selector instanceof Array)){
var rule = this.getRule(selector);
if(rule){
for(key in rule.style){
if(rule.style[key] && String(rule.style[key]).indexOf(':') < 0 && rule.style[key] != 'false'){
try{el.style[key] = '';}catch(e){}
}
}
return true;
}
}else{
for(var i = 0; i < selector.length; i++){
if(this.revert(el, selector[i])){
return true;
}
}
}
return false;
};
this.revertFirst = function(el, id, selector){
var selectors = [
'#' + id + ' ' + selector,
selector
];
return this.revert(el, selectors);
};
}();
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