Changing items in aspx listbox from javascript

[Jim M]

I am having trouble changing any properties of the web form listbox from
client side javascript.

As an example, all of the lines below seem to cause an error...

temp = document.getEle mentById("dropC ategory1").leng th
window.alert("t emp = " + temp)
document.getEle mentById("dropC ategory1").Item s.Clear()

Can the web form listbox be seen from client side javascript?

Thanks in advance.

Jim

[Sean Bright]

Yes, the problem is that the ID of the listbox changes once it is
rendered in the final output.

You can try something like this:

temp = document.getEle mentById("<%= dropCategory1.C lientID %>");

Which should give you the ID of the control once it has been rendered on
the page.

Thanks,
Sean

Jim M wrote:

I am having trouble changing any properties of the web form listbox from
client side javascript.

As an example, all of the lines below seem to cause an error...

temp = document.getEle mentById("dropC ategory1").leng th
window.alert("t emp = " + temp)
document.getEle mentById("dropC ategory1").Item s.Clear()

Can the web form listbox be seen from client side javascript?

Thanks in advance.

Jim

[DWinter]

You can, do it all the time, what is the error it is throwing?
I assume that you declared temp somewhere above this with var temp;
If not, try var temp=....
Eventhough they may not alway throw an error, use your semicolons as good
measure at the end of each line.

"Jim M" <an********@dis cussions.micros oft.com> wrote in message
news:O8******** ******@TK2MSFTN GP09.phx.gbl...

I am having trouble changing any properties of the web form listbox from
client side javascript.

As an example, all of the lines below seem to cause an error...

temp = document.getEle mentById("dropC ategory1").leng th
window.alert("t emp = " + temp)
document.getEle mentById("dropC ategory1").Item s.Clear()

Can the web form listbox be seen from client side javascript?

Thanks in advance.

Jim