// 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 doZebra() {
 var tables = document.getElementsByTagName("table");
 for (var x = 0; x < tables.length; x++) {
  var table = tables[x];
  if (table.className != "zebra") continue;
  var tbodies = table.getElementsByTagName("tbody");
  for (var y = 0; y < tbodies.length; y++) {
   var tbody = tbodies[y];
   var even = false;
   var trs = tbody.getElementsByTagName("tr");
   for (var z = 0; z < trs.length; z++) {
    tr = trs[z];
    tr.className += (even ? " even" : " odd");
    even = !even;
   }
  }
 }
}

function doFarbig() {
 var tables = document.getElementsByTagName("table");
 for (var x = 0; x < tables.length; x++) {
  var table = tables[x];
  if (table.className != "farbig") continue;
  var tbodies = table.getElementsByTagName("tbody");
  for (var y = 0; y < tbodies.length; y++) {
   var tbody = tbodies[y];
   var even = false;
   var trs = tbody.getElementsByTagName("tr");
   for (var z = 0; z < trs.length; z++) {
    tr = trs[z];
    tr.className += (even ? " even" : " odd");
    even = !even;
   }
  }
 }
}

function start ()
{
	doZebra();
	doFarbig();
	striper("ul","striped","li","first,second");
}

window.onload = start;