populate dropdown onchange without reloading page

[Stimp]

I have 2 dropdowns, county and district.

When the county changes, I want the district dropdown to automatically
update with a list of districts in that county, but I don't want the
page to have to reload when county changes.

I remember doing this before in classic ASP with javascript, can I do
this with a dropdownlist in ASP.NET or should I stick with the HTML
dropdown?

Thanks,
Peter

 

[Karl Seguin]

It has to be done in JavaScript. Whether you use an ASP.Net dropdownlist or
the HTML <select> really doesn't matter. Just note that items added to the
dropdownlist dynamically won't exist when you do post back. You'll need to
use the good-old Request.Form.

You can check out:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnaspp/html/ASPNetSpicedAjax.asp

which has an AJAX implementation of creating linked dropdowns..

Karl