// Splintered striper 1.3
// reworking of Zebra Tables and similar methods which works not only for tables and even/odd rows,
// but as a general DOM means of assigning any number of classes to children of a parent element.
// Patrick H. Lauke aka redux / www.splintered.co.uk
// Distributed under the Creative Commons Attribution-ShareAlike license - http://creativecommons.org/licenses/by-sa/2.0/


/*
 * Summary:      Core experiment function that applies any number of classes to all child elements
 *               contained in all occurences of a parent element (either with or without a specific class)
 * Parameters:   parentElementTag - parent tag name
 *               parentElementClass - class assigned to the parent; if null, all parentElementTag elements will be affected
 *               childElementTag -  tag name of the child elements to apply the styles to
 *               styleClasses - comma separated list of any number of style classes (using 2 classes gives the classic "zebra" effect)
 * Return:       none
 */
function striper(parentElementTag, parentElementClass, childElementTag, styleClasses)
{
	var i=0,currentParent,currentChild;
	// capability and sanity check
	if ((document.getElementsByTagName)&&(parentElementTag)&&(childElementTag)&&(styleClasses)) {
		// turn the comma separate list of classes into an array
		var styles = styleClasses.split(',');
		// get an array of all parent tags
		var parentItems = document.getElementsByTagName(parentElementTag);
		// loop through all parent elements
		while (currentParent = parentItems[i++]) {
			// if parentElementClass was null, or if the current parent's class matches the specified class
			if ((parentElementClass == null)||(currentParent.className == parentElementClass)) {
				var j=0,k=0;
				// get all child elements in the current parent element
				var childItems = currentParent.getElementsByTagName(childElementTag);
				// loop through all child elements
				while (currentChild = childItems[j++]) {
					// based on the current element and the number of styles in the array, work out which class to apply
					k = (j+(styles.length-1)) % styles.length;
					// add the class to the child element - if any other classes were already present, they're kept intact
					currentChild.className = currentChild.className+" "+styles[k];
				}
			}
		}
	}
}

function stripe() {
	striper('table','list','tr','AltRow,Row');
}


function initRowHighlighting()
{
	if (!document.getElementsByTagName){ return; }
	
	var tables = document.getElementsByTagName('table');
	for(var i = 0; i < tables.length; i++)
	{
		var table = tables[i];
		if(table.className && table.className.indexOf('list') >= 0)
		{
			//Make sure to use th tags for header row.
			attachRowMouseEvents(table.getElementsByTagName('tr'));
		}
	}
}

function attachRowMouseEvents(rows)
{
	for(var i = 0; i < rows.length; i++)
	{
		var row = rows[i];
		if(i%2 == 0)
		{
			row.onmouseover =	function() 
								{ 
									this.setAttribute('oldClass', this.className);
									this.className = 'highlight';
								};
			
			row.onmouseout =	function() 
								{ 
									this.className = this.getAttribute('oldClass');
								};
		}
		else
		{
			row.onmouseover =	function() 
								{ 
									this.setAttribute('oldClass', this.className);
									this.className = 'highlightAlt';
								};
			
			row.onmouseout =	function() 
								{ 
									this.className = this.getAttribute('oldClass');
								};
		}
	}
}

addLoadEvent(stripe);