/*
rotator.js : Created on 5/10/2007 by Tim Walker
Purpose: To rotate a set of images on a page with a given interval.
Usage:
-Include this script into the of the page.
e.g.
-Add an image tag with an id attribute somewhere within the
e.g. ....
...
-After the image tag, create a Rotator object (setting it's properties in the constructor),
and attach it's init method to the body load using inline javascript.
e.g.
*/
function Rotator(oArg){
var hasArgs = (typeof oArg!='undefined')?true:false;
//private properties
var o = this;// scope protection for this
o.imgIndex = 0;
o.intervalID = 0;
// public properties
o.delay = (hasArgs && oArg.delay)? oArg.delay : 4000;// delay between image rotation
o.rotatorID = (hasArgs && oArg.rotatorID)? oArg.rotatorID : 'currentrotator';// ID of ![]()
to swap
o.imgRotators = (hasArgs && oArg.imgRotators)? oArg.imgRotators : ['images/rotatingphoto1.gif', 'img/rotatingphoto2.gif'];// Array of image paths
// methods
o.setRotator = function(imgSrc){
var elCurRot = document.getElementById(o.rotatorID);
if(elCurRot == null){return;}
elCurRot.src = imgSrc;
}
o.rotate = function(){
// set the index
o.imgIndex++;
if(o.imgIndex >= o.imgRotators.length){o.imgIndex = 0;}
// set the rotator
o.setRotator(o.imgRotators[o.imgIndex]);
}
o.stop = function(){
clearInterval(o.intervalID);
}
o.init = function(){
if(!document.getElementById){return;}
var elCurRot = document.getElementById(o.rotatorID);
if(elCurRot == null || o.imgRotators.length == 1){
return;
}
else{
o.setRotator(o.imgRotators[0]);
o.intervalID = setInterval(o.rotate, o.delay);
}
}
}
// event handling
function array_search(val, arr)
{
var i = arr.length;
while (i--)
if (arr[i] && arr[i] === val) break;
return i;
}
function addEvent(obj, evType, fn){
var evTypeRef = '__' + evType;
if (obj[evTypeRef])
{
if (array_search(fn, obj[evTypeRef]) > -1) return;
}
else
{
obj[evTypeRef] = [];
if (obj['on'+evType]) obj[evTypeRef][0] = obj['on'+evType];
obj['on'+evType] = handleEvent;
}
obj[evTypeRef][obj[evTypeRef].length] = fn;
}
function handleEvent(e)
{
e = e || window.event;
var evTypeRef = '__' + e.type, retValue = true;
for (var i = 0, j = this[evTypeRef].length; i < j; i++)
{
if (this[evTypeRef][i])
{
this.__fn = this[evTypeRef][i];
retValue = this.__fn(e) && retValue;
}
}
if (this.__fn) try { delete this.__fn; } catch(e) { this.__fn = null; }
return retValue;
}