egroupware/api/js/jsapi/egw_css.js

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/**
* eGroupWare eTemplate2 - Stylesheet class
*
* @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License
* @package etemplate
* @subpackage api
* @link http://www.egroupware.org
* @author Andreas Stöckel
* @copyright Stylite 2011
* @version $Id$
*/
/*egw:uses
egw_core;
*/
/**
* Module which allows to add stylesheet rules at runtime. Exports the following
* functions:
* - css
* @param {string} _app application name object is instanciated for
* @param {object} _wnd window object is instanciated for
*/
egw.extend('css', egw.MODULE_WND_LOCAL, function(_app, _wnd)
{
"use strict";
/**
* Assoziative array which stores the current css rule for a given selector.
*/
var selectors = {};
/**
* Variable used to calculate unique id for the selectors.
*/
var selectorCount = 0;
var sheet;
return {
/**
* The css function can be used to introduce a rule for the given css
* selector. So you're capable of adding new custom css selector while
* runtime and also update them.
*
* @param _selector is the css select which can be used to apply the
* stlyes to the html elements.
* @param _rule is the rule which should be connected to the selector.
* if empty or omitted, the given selector gets removed.
*/
css: function(_selector, _rule) {
// Set the current index to the maximum index
var index = sheet ? Math.min(selectorCount, sheet.cssRules.length) : 0;
if (!sheet || !sheet.ownerNode || sheet.ownerNode.ownerDocument !== _wnd.document)
{
// Generate a style tag, which will be used to hold the newly generated css
// rules.
var style = _wnd.document.createElement('style');
_wnd.document.getElementsByTagName('head')[0].appendChild(style);
// Obtain the reference to the styleSheet object of the generated style tag
sheet = style.sheet ? style.sheet : style.styleSheet;
selectorCount = 0;
selectors = {};
}
// Remove any existing rule first, of no rule exists for the
if (typeof selectors[_selector] !== "undefined")
{
// Store the old index
index = selectors[_selector];
if(index < sheet.cssRules.length)
{
if (typeof sheet.removeRule !== "undefined")
{
sheet.removeRule(index);
}
else
{
sheet.deleteRule(index);
}
}
delete (selectors[_selector]);
if(!_rule)
{
selectorCount--;
}
}
else
{
selectorCount++;
}
if (_rule)
{
// Add the rule to the stylesheet
if (typeof sheet.addRule !== "undefined")
{
sheet.addRule(_selector, _rule, index);
}
else
{
sheet.insertRule(_selector + "{" + _rule + "}", index);
}
// Store the new index
selectors[_selector] = index;
}
}
};
});