// Global Javascript file for Lancaster

//version:   1.0
//author:    Paul Boag
//email:     paul.boag@headscape.co.uk
//website:   http://www.headscape.co.uk



//Get Element by Class Name from: http://www.robertnyman.com/2005/11/07/the-ultimate-getelementsbyclassname/

function getElementsByClassName(oElm, strTagName, strClassName){
    var arrElements = (strTagName == "*" && oElm.all)? oElm.all : oElm.getElementsByTagName(strTagName);
    var arrReturnElements = new Array();
    strClassName = strClassName.replace(/\-/g, "\\-");
    var oRegExp = new RegExp("(^|\\s)" + strClassName + "(\\s|$)");
    var oElement;
    for(var i=0; i<arrElements.length; i++){
        oElement = arrElements[i];      
        if(oRegExp.test(oElement.className)){
            arrReturnElements.push(oElement);
        }   
    }
    return (arrReturnElements)
}


//Function for converting title tags on images into caption
function addCaption(xClass) {
	var allImages = getElementsByClassName(document, "img", xClass);
	for ( var i=0; i < allImages.length; i++) {
		var imageCaption = document.createTextNode(allImages[i].title);
		var imageContainer = document.createElement("div");
		var imagePara = document.createElement("p");
		var imageWidth = allImages[i].getAttribute("width");
		var spareSpan = document.createElement("span"); //This adds an extra span. Useful for curved corners
		imagePara.appendChild(imageCaption);
		allImages[i].parentNode.insertBefore(imageContainer, allImages[i]);
		imageContainer.appendChild(allImages[i]);
		if ( allImages[i].title != "" ) {
		imageContainer.appendChild(imagePara); 
		}
		imageContainer.appendChild(spareSpan);		
		imageContainer.className = xClass
		spareSpan.className = "spareSpan"
		allImages[i].className = "imgCaption"
		imageContainer.style.width = imageWidth + "px";
		
    }
}

// Attches a ignore class to the img so they arent include in link list in IE
function imageClass() {
	if (!document.getElementsByTagName) return false;
	var imageList = document.getElementsByTagName ("img");
	for (var i=0; i < imageList.length; i++) {
	imageList[i].className = imageList[i].className + " ignore";
	}
}

// Opens a link in a new window when class = externalLink

function doPopups() {
  if (!document.getElementsByTagName) return false;
  var links = document.getElementsByTagName("a");
  for (var i=0; i < links.length; i++) {
    if (links[i].className.match("externalLink")) {
		links[i].className = links[i].className + " newWinStyle";
		if (links[i].title == "") {
		links[i].title = "(new window)";
		}
		else {
		links[i].title = links[i].title + " (new window)";	
		}
	 	links[i].onclick = function(e) {
			if(!e)e=window.event;
			if(e.shiftKey || e.ctrlKey || e.altKey) return;
			window.open(this.href);
			return false;
			}
      }
    }
}

// Replicates the :focus behaviour on input for IE

function suckerfish(type, tag, parentId) {
	if (window.attachEvent) {
		window.attachEvent("onload", function() {
			var sfEls = (parentId==null)?document.getElementsByTagName(tag):document.getElementById(parentId).getElementsByTagName(tag);
			type(sfEls);
		});
	}
}


sfFocus = function(sfEls) {
	for (var i=0; i<sfEls.length; i++) {
		sfEls[i].onfocus=function() {
			this.className+=" sffocus";
		}
		sfEls[i].onblur=function() {
			this.className=this.className.replace(new RegExp(" sffocus\\b"), "");
		}
	}
}




// ALTERNATING ROW COLOURS IN TABLE

// Main function, called when the page loads
function alternateRows() {
	var i, j;
	if (!document.getElementById) return
		var tables = document.getElementsByTagName("table");	  
		//search through tables in document
		for (i=0; i<tables.length; i++) {
			// If table has the right classname
				rows = tables[i].getElementsByTagName("tr");
				applyClasstoRows(rows);
		}
}

// Function, which is passed a table reference, applies the class 'even' to each even row, <tr> tag
function applyClasstoRows(myRows) {
	// search through rows
	for (j=0; j<rows.length; j++) {
	   // Set class for even rows (odd doesn't need to be set)
	   if (j%2 == 0) { 
		  rows[j].setAttribute("className", "even");
		  rows[j].setAttribute("class", "even");
	   } 
	}
}

// SWAP IMAGE ON HOVER LINK


function imageLinks(iImage) {
	if (!document.getElementById) return;
	if (!document.getElementsByTagName) return;
	var aLinks = document.getElementsByTagName("a");
	for (var i=0; i<aLinks.length; i++) {
		if (aLinks[i].getAttribute("rel")) {
		aLinks[i].onmouseover = function() {
			document.getElementById(iImage).src = this.getAttribute("rel");
		}
		}
	}
}

// ADD FOOTNOTES  -------------------------------------------------------

// addClass() - appends the specified class to the object
function addClass(theClass) { if (this.className != '') { this.className += ' ' + theClass; } else { this.className = theClass; } } Object.prototype.addClass = addClass;

// inArray() - Hunts for a value in the specified array
function inArray(needle) { for (var i=0; i < this.length; i++) { if (this[i] === needle) { return i; } } return false; } Array.prototype.inArray = inArray;

// Collects all of the links in a page and adds them as footnotes
function footnoteLinks(containerID,targetID) { if (!document.getElementById || !document.getElementsByTagName || !document.createElement) return false; if (!document.getElementById(containerID) || !document.getElementById(targetID)) return false; var container = document.getElementById(containerID); var target = document.getElementById(targetID); var h2 = document.createElement('h2'); addClass.apply(h2,['printOnly']); var h2_txt = document.createTextNode('Links'); h2.appendChild(h2_txt); var coll = container.getElementsByTagName('*'); var ol = document.createElement('ol'); addClass.apply(ol,['printOnly']); var myArr = []; var thisLink; var num = 1; for (var i=0; i<coll.length; i++) { var thisClass = coll[i].className; if ( (coll[i].getAttribute('href') || coll[i].getAttribute('cite')) && (thisClass == '' || thisClass.indexOf('ignore') == -1)) { thisLink = coll[i].getAttribute('href') ? coll[i].href : coll[i].cite; var note = document.createElement('sup'); addClass.apply(note,['printOnly']); var note_txt; var j = inArray.apply(myArr,[thisLink]); if ( j || j===0 ) { note_txt = document.createTextNode(j+1);} else { var li = document.createElement('li'); var li_txt = document.createTextNode(thisLink); li.appendChild(li_txt); ol.appendChild(li); myArr.push(thisLink); note_txt = document.createTextNode(num); num++;} note.appendChild(note_txt); if (coll[i].tagName.toLowerCase() == 'blockquote') { var lastChild = lastChildContainingText.apply(coll[i]); lastChild.appendChild(note);} else { coll[i].parentNode.insertBefore(note, coll[i].nextSibling);} } } target.appendChild(h2); target.appendChild(ol); addClass.apply(document.getElementsByTagName('html')[0],['noted']); return true;}

// Attches a ignore class to the img so they arent include in link list in IE
function imageClass() {
	if (!document.getElementsByTagName) return false;
	var imageList = document.getElementsByTagName ("img");
	for (var i=0; i < imageList.length; i++) {
	imageList[i].className = imageList[i].className + " ignore";
	}
}


// Runs all the listed functions on the loading of the window

window.onload=function(){
alternateRows();
addCaption("imgLeft");
addCaption("imgRight");
doPopups();
suckerfish(sfFocus, "INPUT");
suckerfish(sfFocus, "TEXTAREA");
suckerfish(sfFocus, "SELECT");
imageLinks("portalImg");
imageClass();
footnoteLinks("content","footnotes");
}