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Copyright (c) 2009, Yahoo! Inc. All rights reserved.
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Code licensed under the BSD License:
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http://developer.yahoo.net/yui/license.txt
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* The StyleSheet component is a utility for managing css rules at the
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* @namespace YAHOO.util
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p = d.createElement('p'), // Have to hold the node (see notes)
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workerStyle = p.style, // worker style collection
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floatAttr = ('cssFloat' in workerStyle) ? 'cssFloat' : 'styleFloat',
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* Normalizes the removal of an assigned style for opacity. IE uses the filter property.
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_unsetOpacity = ('opacity' in workerStyle) ?
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function (style) { style.opacity = ''; } :
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function (style) { style.filter = ''; };
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* Normalizes the removal of an assigned style for a given property. Expands
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* shortcut properties if necessary and handles the various names for the float property.
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workerStyle.border = "1px solid red";
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workerStyle.border = ''; // IE doesn't unset child properties
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_unsetProperty = workerStyle.borderLeft ?
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function (style,prop) {
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if (prop !== floatAttr && prop.toLowerCase().indexOf('float') != -1) {
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if (typeof style[prop] === 'string') {
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case 'filter' : _unsetOpacity(style); break;
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style.font = style.fontStyle = style.fontVariant =
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style.fontWeight = style.fontSize = style.lineHeight =
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style.fontFamily = '';
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if (p.indexOf(prop) === 0) {
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function (style,prop) {
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if (prop !== floatAttr && prop.toLowerCase().indexOf('float') != -1) {
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if (lang.isString(style[prop])) {
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if (prop === 'opacity') {
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* Create an instance of YAHOO.util.StyleSheet to encapsulate a css stylesheet.
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* The constructor can be called using function or constructor syntax.
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* <pre><code>var sheet = YAHOO.util.StyleSheet(..);</pre></code>
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* <pre><code>var sheet = new YAHOO.util.StyleSheet(..);</pre></code>
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* The first parameter passed can be any of the following things:
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* <li>The desired string name to register a new empty sheet</li>
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* <li>The string name of an existing YAHOO.util.StyleSheet instance</li>
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* <li>The unique yuiSSID generated for an existing YAHOO.util.StyleSheet instance</li>
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* <li>The id of an existing <code><link></code> or <code><style></code> node</li>
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* <li>The node reference for an existing <code><link></code> or <code><style></code> node</li>
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* <li>A chunk of css text to create a new stylesheet from</li>
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* <p>If a string is passed, StyleSheet will first look in its static name
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* registry for an existing sheet, then in the DOM for an element with that id.
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* If neither are found and the string contains the { character, it will be
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* used as a the initial cssText for a new StyleSheet. Otherwise, a new empty
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* StyleSheet is created, assigned the string value as a name, and registered
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* statically by that name.</p>
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* <p>The optional second parameter is a string name to register the sheet as.
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* This param is largely useful when providing a node id/ref or chunk of css
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* text to create a populated instance.</p>
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* @param seed {String|HTMLElement} a style or link node, its id, or a name or
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* yuiSSID of a StyleSheet, or a string of css text (see above)
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* @param name {String} OPTIONAL name to register instance for future static
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function StyleSheet(seed, name) {
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// Factory or constructor
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if (!(this instanceof arguments.callee)) {
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return new arguments.callee(seed,name);
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head = d.getElementsByTagName('head')[0];
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// TODO: do something. Preferably something smart
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throw new Error('HEAD element not found to append STYLE node');
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// capture the DOM node if the string is an id
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node = seed && (seed.nodeName ? seed : d.getElementById(seed));
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// Check for the StyleSheet in the static registry
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if (seed && sheets[seed]) {
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} else if (node && node.yuiSSID && sheets[node.yuiSSID]) {
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return sheets[node.yuiSSID];
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// Create a style node if necessary
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if (!node || !/^(?:style|link)$/i.test(node.nodeName)) {
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node = d.createElement('style');
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node.type = 'text/css';
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if (lang.isString(seed)) {
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// Create entire sheet from seed cssText
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if (seed.indexOf('{') != -1) {
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// Not a load-time fork because low run-time impact and IE fails
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// test for s.styleSheet at page load time (oddly)
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if (node.styleSheet) {
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node.styleSheet.cssText = seed;
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node.appendChild(d.createTextNode(seed));
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if (node.parentNode !== head) {
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// styleSheet isn't available on the style node in FF2 until appended
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// to the head element. style nodes appended to body do not affect
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head.appendChild(node);
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// Begin setting up private aliases to the important moving parts
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// 1. The stylesheet object
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// IE stores StyleSheet under the "styleSheet" property
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// Safari doesn't populate sheet for xdomain link elements
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sheet = node.sheet || node.styleSheet;
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// 2. The style rules collection
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// IE stores the rules collection under the "rules" property
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_rules = sheet && ('cssRules' in sheet) ? 'cssRules' : 'rules';
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// 3. Initialize the cssRules map from the node
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// xdomain link nodes forbid access to the cssRules collection, so this
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// will throw an error.
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// TODO: research alternate stylesheet, @media
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for (i = sheet[_rules].length - 1; i >= 0; --i) {
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r = sheet[_rules][i];
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sel = r.selectorText;
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cssRules[sel].style.cssText += ';' + r.style.cssText;
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// 4. The method to remove a rule from the stylesheet
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// IE supports removeRule
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_deleteRule = ('deleteRule' in sheet) ?
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function (i) { sheet.deleteRule(i); } :
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function (i) { sheet.removeRule(i); };
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// 5. The method to add a new rule to the stylesheet
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// IE supports addRule with different signature
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_insertRule = ('insertRule' in sheet) ?
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function (sel,css,i) { sheet.insertRule(sel+' {'+css+'}',i); } :
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function (sel,css,i) { sheet.addRule(sel,css,i); };
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// Cache the instance by the generated Id
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node.yuiSSID = 'yui-stylesheet-' + (ssId++);
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StyleSheet.register(node.yuiSSID,this);
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// Register the instance by name if provided or defaulted from seed
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StyleSheet.register(name,this);
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lang.augmentObject(this,{
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* Get the unique yuiSSID for this StyleSheet instance
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* @return {Number} the static id
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getId : function () { return node.yuiSSID; },
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* The HTMLElement that this instance encapsulates
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* Enable all the rules in the sheet
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* @return {StyleSheet} the instance
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// Enabling/disabling the stylesheet. Changes may be made to rules
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enable : function () { sheet.disabled = false; return this; },
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* Disable all the rules in the sheet. Rules may be changed while the
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* StyleSheet is disabled.
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* @return {StyleSheet} the instance
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disable : function () { sheet.disabled = true; return this; },
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* Returns boolean indicating whether the StyleSheet is enabled
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* @return {Boolean} is it enabled?
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isEnabled : function () { return !sheet.disabled; },
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* <p>Set style properties for a provided selector string.
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* If the selector includes commas, it will be split into individual
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* selectors and applied accordingly. If the selector string does not
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* have a corresponding rule in the sheet, it will be added.</p>
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* <p>The object properties in the second parameter must be the JavaScript
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* names of style properties. E.g. fontSize rather than font-size.</p>
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* <p>The float style property will be set by any of "float",
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* "styleFloat", or "cssFloat".</p>
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* @param sel {String} the selector string to apply the changes to
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* @param css {Object} Object literal of style properties and new values
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* @return {StyleSheet} the StyleSheet instance
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set : function (sel,css) {
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var rule = cssRules[sel],
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multi = sel.split(/\s*,\s*/),i,
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// IE's addRule doesn't support multiple comma delimited selectors
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if (multi.length > 1) {
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for (i = multi.length - 1; i >= 0; --i) {
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this.set(multi[i], css);
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// Some selector values can cause IE to hang
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if (!StyleSheet.isValidSelector(sel)) {
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// Opera throws an error if there's a syntax error in assigned
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// cssText. Avoid this using a worker style collection, then
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// assigning the resulting cssText.
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rule.style.cssText = StyleSheet.toCssText(css,rule.style.cssText);
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idx = sheet[_rules].length;
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css = StyleSheet.toCssText(css);
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// IE throws an error when attempting to addRule(sel,'',n)
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// which would crop up if no, or only invalid values are used
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_insertRule(sel, css, idx);
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// Safari replaces the rules collection, but maintains the
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// rule instances in the new collection when rules are
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cssRules[sel] = sheet[_rules][idx];
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* <p>Unset style properties for a provided selector string, removing
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* their effect from the style cascade.</p>
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* <p>If the selector includes commas, it will be split into individual
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* selectors and applied accordingly. If there are no properties
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* remaining in the rule after unsetting, the rule is removed.</p>
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* <p>The style property or properties in the second parameter must be the
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* <p>JavaScript style property names. E.g. fontSize rather than font-size.</p>
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* <p>The float style property will be unset by any of "float",
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* "styleFloat", or "cssFloat".</p>
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* @param sel {String} the selector string to apply the changes to
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* @param css {String|Array} style property name or Array of names
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* @return {StyleSheet} the StyleSheet instance
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unset : function (sel,css) {
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var rule = cssRules[sel],
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multi = sel.split(/\s*,\s*/),
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// IE's addRule doesn't support multiple comma delimited selectors
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// so rules are mapped internally by atomic selectors
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if (multi.length > 1) {
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for (i = multi.length - 1; i >= 0; --i) {
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this.unset(multi[i], css);
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if (!lang.isArray(css)) {
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workerStyle.cssText = rule.style.cssText;
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for (i = css.length - 1; i >= 0; --i) {
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_unsetProperty(workerStyle,css[i]);
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if (workerStyle.cssText) {
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rule.style.cssText = workerStyle.cssText;
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if (remove) { // remove the rule altogether
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rules = sheet[_rules];
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for (i = rules.length - 1; i >= 0; --i) {
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if (rules[i] === rule) {
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delete cssRules[sel];
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* Get the current cssText for a rule or the entire sheet. If the
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* selector param is supplied, only the cssText for that rule will be
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* returned, if found. If the selector string targets multiple
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* selectors separated by commas, the cssText of the first rule only
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* will be returned. If no selector string, the stylesheet's full
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* cssText will be returned.
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* @param sel {String} Selector string
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getCssText : function (sel) {
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if (lang.isString(sel)) {
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// IE's addRule doesn't support multiple comma delimited
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// selectors so rules are mapped internally by atomic selectors
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rule = cssRules[sel.split(/\s*,\s*/)[0]];
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return rule ? rule.style.cssText : null;
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for (sel in cssRules) {
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if (cssRules.hasOwnProperty(sel)) {
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rule = cssRules[sel];
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css.push(rule.selectorText+" {"+rule.style.cssText+"}");
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return css.join("\n");
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_toCssText = function (css,base) {
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var f = css.styleFloat || css.cssFloat || css['float'],
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workerStyle.cssText = base || '';
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if (f && !css[floatAttr]) {
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css = lang.merge(css);
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delete css.styleFloat; delete css.cssFloat; delete css['float'];
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if (css.hasOwnProperty(prop)) {
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// IE throws Invalid Value errors and doesn't like whitespace
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// in values ala ' red' or 'red '
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workerStyle[prop] = lang.trim(css[prop]);
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return workerStyle.cssText;
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lang.augmentObject(StyleSheet, {
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* <p>Converts an object literal of style properties and values into a string
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* of css text. This can then be assigned to el.style.cssText.</p>
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* <p>The optional second parameter is a cssText string representing the
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* starting state of the style prior to alterations. This is most often
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* extracted from the eventual target's current el.style.cssText.</p>
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* @method StyleSheet.toCssText
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* @param css {Object} object literal of style properties and values
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* @param cssText {String} OPTIONAL starting cssText value
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* @return {String} the resulting cssText string
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toCssText : (('opacity' in workerStyle) ? _toCssText :
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// Wrap IE's toCssText to catch opacity. The copy/merge is to preserve
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// the input object's integrity, but if float and opacity are set, the
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// input will be copied twice in IE. Is there a way to avoid this
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// without increasing the byte count?
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function (css, cssText) {
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if ('opacity' in css) {
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css = lang.merge(css,{
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filter: 'alpha(opacity='+(css.opacity*100)+')'
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return _toCssText(css,cssText);
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* Registers a StyleSheet instance in the static registry by the given name
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* @method StyleSheet.register
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* @param name {String} the name to assign the StyleSheet in the registry
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* @param sheet {StyleSheet} The StyleSheet instance
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* @return {Boolean} false if no name or sheet is not a StyleSheet
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* instance. true otherwise.
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register : function (name,sheet) {
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return !!(name && sheet instanceof StyleSheet &&
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!sheets[name] && (sheets[name] = sheet));
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* <p>Determines if a selector string is safe to use. Used internally
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* in set to prevent IE from locking up when attempting to add a rule for a
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* "bad selector".</p>
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* <p>Bad selectors are considered to be any string containing unescaped
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* `~!@$%^&()+=|{}[];'"?< or space. Also forbidden are . or # followed by
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* anything other than an alphanumeric. Additionally -abc or .-abc or
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* #_abc or '# ' all fail. There are likely more failure cases, so
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* please file a bug if you encounter one.</p>
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* @method StyleSheet.isValidSelector
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* @param sel {String} the selector string
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isValidSelector : function (sel) {
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if (sel && lang.isString(sel)) {
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if (!selectors.hasOwnProperty(sel)) {
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// TEST: there should be nothing but white-space left after
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// these destructive regexs
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selectors[sel] = !/\S/.test(
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sel.replace(/\s+|\s*[+~>]\s*/g,' ').
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// attribute selectors (contents not validated)
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replace(/([^ ])\[.*?\]/g,'$1').
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// pseudo-class|element selectors (contents of parens
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// such as :nth-of-type(2) or :not(...) not validated)
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replace(/([^ ])::?[a-z][a-z\-]+[a-z](?:\(.*?\))?/ig,'$1').
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replace(/(?:^| )[a-z0-6]+/ig,' ').
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// escaped characters
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// class and id identifiers
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replace(/[.#]\w[\w\-]*/g,''));
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valid = selectors[sel];
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YAHOO.util.StyleSheet = StyleSheet;
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* Style node must be added to the head element. Safari does not honor styles
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applied to StyleSheet objects on style nodes in the body.
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* StyleSheet object is created on the style node when the style node is added
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to the head element in Firefox 2 (and maybe 3?)
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* The cssRules collection is replaced after insertRule/deleteRule calls in
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Safari 3.1. Existing Rules are used in the new collection, so the collection
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cannot be cached, but the rules can be.
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* Opera requires that the index be passed with insertRule.
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* Same-domain restrictions prevent modifying StyleSheet objects attached to
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link elements with remote href (or "about:blank" or "javascript:false")
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* Same-domain restrictions prevent reading StyleSheet cssRules/rules
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collection of link elements with remote href (or "about:blank" or
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* Same-domain restrictions result in Safari not populating node.sheet property
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for link elements with remote href (et.al)
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* IE names StyleSheet related properties and methods differently (see code)
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* IE converts tag names to upper case in the Rule's selectorText
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* IE converts empty string assignment to complex properties to value settings
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for all child properties. E.g. style.background = '' sets non-'' values on
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style.backgroundPosition, style.backgroundColor, etc. All else clear
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style.background and all child properties.
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* IE assignment style.filter = '' will result in style.cssText == 'FILTER:'
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* All browsers support Rule.style.cssText as a read/write property, leaving
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only opacity needing to be accounted for.
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* Benchmarks of style.property = value vs style.cssText += 'property: value'
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indicate cssText is slightly slower for single property assignment. For
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multiple property assignment, cssText speed stays relatively the same where
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style.property speed decreases linearly by the number of properties set.
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Exception being Opera 9.27, where style.property is always faster than
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* Opera 9.5b throws a syntax error when assigning cssText with a syntax error.
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* Opera 9.5 doesn't honor rule.style.cssText = ''. Previous style persists.
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You have to remove the rule altogether.
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* Stylesheet properties set with !important will trump inline style set on an
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element or in el.style.property.
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* Creating a worker style collection like document.createElement('p').style;
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will fail after a time in FF (~5secs of inactivity). Property assignments
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will not alter the property or cssText. It may be the generated node is
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garbage collected and the style collection becomes inert (speculation).
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* IE locks up when attempting to add a rule with a selector including at least
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characters {[]}~`!@%^&*()+=|? (unescaped) and leading _ or -
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such as addRule('-foo','{ color: red }') or addRule('._abc','{...}')
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* IE's addRule doesn't support comma separated selectors such as
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addRule('.foo, .bar','{..}')
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* IE throws an error on valid values with leading/trailing white space.
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* When creating an entire sheet at once, only FF2/3 & Opera allow creating a
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style node, setting its innerHTML and appending to head.
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* When creating an entire sheet at once, Safari requires the style node to be
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created with content in innerHTML of another element.
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* When creating an entire sheet at once, IE requires the style node content to
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be set via node.styleSheet.cssText
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* When creating an entire sheet at once in IE, styleSheet.cssText can't be
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written until node.type = 'text/css'; is performed.
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* When creating an entire sheet at once in IE, load-time fork on
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var styleNode = d.createElement('style'); _method = styleNode.styleSheet ?..
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fails (falsey). During run-time, the test for .styleSheet works fine
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* Setting complex properties in cssText will SOMETIMES allow child properties
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set unset FF2 FF3 S3.1 IE6 IE7 Op9.27 Op9.5
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---------- ----------------- --- --- ---- --- --- ------ -----
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border -top NO NO YES YES YES YES YES
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-top-color NO NO YES YES YES
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-color NO NO NO NO NO
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background -color NO NO YES YES YES
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-position NO NO YES YES YES
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-position-x NO NO NO NO NO
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font line-height YES YES NO NO NO NO YES
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-style YES YES NO YES YES
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-size YES YES NO YES YES
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-size-adjust ??? ??? n/a n/a n/a ??? ???
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padding -top NO NO YES YES YES
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margin -top NO NO YES YES YES
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list-style -type YES YES YES YES YES
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-position YES YES YES YES YES
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overflow -x NO NO YES n/a YES
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??? - unsetting font-size-adjust has the same effect as unsetting font-size
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* FireFox and WebKit populate rule.cssText as "SELECTOR { CSSTEXT }", but
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* IE6 and IE7 silently ignore the { and } if passed into addRule('.foo','{
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color:#000}',0). IE8 does not and creates an empty rule.
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* IE6-8 addRule('.foo','',n) throws an error. Must supply *some* cssText
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YAHOO.register("stylesheet", YAHOO.util.StyleSheet, {version: "2.7.0", build: "1799"});
added
removed
var/httpd/htdocs/yui/2.7.0/build/stylesheet/stylesheet.js
