Javascript -> ASP

[hombre_de_las_ca]

can anyone tell me how to pass a value stored in a javascript function to an ASP variable when onchange event executes for a list box inside an ASP page without rerfreshing the page!!!
For Example:
if i want to pass the value of varchar to a variable Zoom defined in the ASP page on onchange event of a list box inside an asp page(even to a hidden field in the page) how will i do it !!

<%

dim Zoom

%>


function func()
{
var varchar
varchar = "aaa"
}

[HarryR]

One way you can do this is to dynamicly write out the client-side javascript, or use XmlHttpRequest.

Obviously writing out the javascript is easiest, as shown in my example:

<%
 Dim whatever
 whatever = "abc"
%>
<script language="JavaScript">
  function helloWorld ()
  {
    alert("<%= whatever %>");
   }
</script>

[momos]

put the value of the javascript in a hidden-field(input), and when you submit your site, you'll find it in the request-object.

hope this helps...

[hombre_de_las_ca]

i have no idea how to put the value from the javascript into a hidden field...could u help me with that!!!

[momos]

something like:
document.getElementById(/*the id of the input type hidden*/).value="aaa";

then submit your form, and now you have your variable...

[hombre_de_las_ca]

thanks Momos...it worked... : )
CaveMan