I have a small problem with Javascript events which I hope some of you can help me with.
Let's say I have two Javascript classes. Both of these classes adds an onmousemove event to the <HTML> tag(document.documentEleme
This code illustrates what I mean:
Code:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html
<html>
<head>
<title>Test of js events</title>
<style type="text/css">
#event1,#event2{
width:300px;
height:300px;
border:1px solid #000;
background-color:#EEE;
margin-right:10px;
float:left;
}
</style>
<script type="text/javascript">
function Class1()
{
}
Class1.prototype = {
addEvent : function()
{
if(document.documentElemen
// What can I put in here. I don't want to delete the old event.
}else{
document.documentElement.o
}
}
,
me : function(e)
{
if(document.all)e = event;
document.getElementById('e
}
}
function Class2()
{
}
Class2.prototype = {
addEvent : function()
{
if(document.documentElemen
// What can I put in here. I don't want to delete the old event.
}else{
document.documentElement.o
}
}
,
me : function(e)
{
if(document.all)e = event;
document.getElementById('e
}
}
</script>
</head>
<body>
<div id="event1"></div>
<div id="event2"></div>
<script type="text/javascript">
var obj1 = new Class1;
obj1.addEvent();
var obj2= new Class2;
obj2.addEvent();
</script>
</body>
</html>
As you can see, I have two classes, and at the bottom I create one object of each class. If it had worked as I hoped, the x and y position of the mouse should have been written into both of the gray boxes.
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So...using your code (without actually having tested it) you should be able to replace:
if(document.documentElemen
// What can I put in here. I don't want to delete the old event.
}else{
document.documentElement.o
}
with this:
var oldMouseMove = document.documentElement.o
document.documentElement.o
if (oldMouseMove) oldMouseMove();
this.me();
}
I'd suggest functions from http://ejohn.org/apps/jsel
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Answer for Membership
by: TedInAKPosted on 2006-08-28 at 02:37:10ID: 17402579
Just assign the old event to a variable and then create a new event incorporating the old event, like so:
<html>
<head>
<script type="text/javascript">
window.onload = function() { alert("This is the original 'onload'") }
var newOnload = window.onload; // if there is not an "onload" already assigned, it doesn't matter, we'll check for it in a moment
window.onload = function() {
if(newOnload) newOnload();
alert("This is the added 'onload'")
}
</script>
</head>
<body>
</body>
</html>