DirkManuel
asked on
How to refer to a document element from within an external javascript file
I want to get the x,y co-ordinates of a specific element in my HTML document.
The document contains the code:
...
<DIV ID="content">
...
If I put the following JavaScript code inside the SAME HTML file:
...
var obj = document.getElementById("c
var x = obj.offsetLeft;
var y = obj.offsetTop;
alert(x + ", " + y);
...
Then I get the correct answer. However, if I move this code to an external .js file which is then included in the actual HTML file by:
<script type="text/javascript" src="script.js"></script>
Then it fails with an 'Error object required' message.
What am I doing wrong? I am thinking that maybe the 'document' reference isn't working as it is within a separate physical file, but I wouldn't know how to correct it. Any clues?
Thanks,
Dirk
The document contains the code:
...
<DIV ID="content">
...
If I put the following JavaScript code inside the SAME HTML file:
...
var obj = document.getElementById("c
var x = obj.offsetLeft;
var y = obj.offsetTop;
alert(x + ", " + y);
...
Then I get the correct answer. However, if I move this code to an external .js file which is then included in the actual HTML file by:
<script type="text/javascript" src="script.js"></script>
Then it fails with an 'Error object required' message.
What am I doing wrong? I am thinking that maybe the 'document' reference isn't working as it is within a separate physical file, but I wouldn't know how to correct it. Any clues?
Thanks,
Dirk
It worked fine for me, Dirk.
Make sure you don't have
<!-- --> surrounding your JS in your JS file.
Make sure you don't have
<!-- --> surrounding your JS in your JS file.
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Why the grading B???
Hi
Did you remove <script> & </script> tags from external js file ?
RJ
Did you remove <script> & </script> tags from external js file ?
RJ
ASKER
I graded it B because it answered my question but not my entire problem - I needed to get the x and y coords of an element to use to position a js menu, but the menu seems to get created before whatever is executed on the 'onload' so the values are still undefined at the point that I need them. I tried creating the whole menu on the 'onload' but then it seems to replace the entire contents of the window with the menu. I think I need to do some more research and playing around. Maybe then I'll know what I'm asking...
Giving B's and not even saying Thank You will reduce the number of experts being happy when helped to you.
Think about it and have a nice day.
Think about it and have a nice day.
function getX(obj)
{
return( obj.offsetParent==null ? obj.offsetLeft : obj.offsetLeft+getX(obj.of
}
function getY(obj)
{
return( obj.offsetParent==null ? obj.offsetTop : obj.offsetTop+getY(obj.off
}
var obj = document.getElementById("c
var x = getX(obj);
var y = getY(obj);
alert(x + ", " + y);