How to pass a value from an HTML hidden input to a JavaScript function?

[Steve Kershaw]

Hi,

I need to pass a value from a hidden input:
<input id="hiddentxtWidth" type="hidden" value="1065" />
to a JavaScript function.

I've tried the following:
<script type="text/javascript" >
window.resizeTo(<%= hiddentxtWidth.value %>, <%=
hiddentxtHeight.value %>);
</script>

But I get a "The name 'hiddertxtWidth' does not exist in the current
context" error.

I would very much like to store the page width and height in the
Web.Config file and pass it to the JavaScript function but I don't
know how to do that.

Any suggestions?

 

[sloan]

If you're doing this all clientside, then you're looking for

http://msdn2.microsoft.com/en-us/library/ms536437.aspx


function TestMe

{
var v=document.getElementById("hiddentxtWidth");
if (null!=v)
{
alert(v.value);
}
}


something like that. give it a try.

Use null checks to avoid a bunch of javascript errors.

 

[John Kotuby]

Just type getElementById in google search and you'll see a bunch of
javascript links.

I don't know about using the web.config for holding window size information
but you can set session variables in the global.asax.
Then just grab session("elemW") if that's what you called it.
The syntax might not be exactly correct for grabbing the session variable,
but the concept is right.

 

[Eliyahu Goldin]

How to Pass Messages and Actions between Server and Client
http://usableasp.net/DeveloperPage....o/HowToPassMessagesBetweenServerAndClient.htm

--
Eliyahu Goldin,
Software Developer & Consultant
Microsoft MVP [ASP.NET]
http://msmvps.com/blogs/egoldin
http://usableasp.net