client-side controls and server-side code

[Jake]

To avoid a postback, we want to use a webservice and XMLHTTP to fetch the
list of values for dropdowns whose contents are determined by an earlier
user-choice on the page. E.g. if the user selects "FL" from the State
dropdown, the Cities dropdown will be populated with cities in Florida only:

State Dropdown Cities Dropdown
NY Miami
PA Tampa
FL St Augustine


If the Cities dropdown is a client-side SELECT object populated in this
manner (i.e. client-side DOM parsing of XML dataset returned by a
webservice), is it possible, in code-behind, to detect which City was
selected when the form is posted?

Thanks
Jake

 

[Lucas Tam]

is it possible, in code-behind, to detect which City was
selected when the form is posted?

Yes you can use the class "Request.form" to read the control value.

 

[Steve C. Orr [MVP, MCSD]]

You may need to use client side script to write the value to a hidden field.
Then you could read the hidden field from the Request.Form collection.

I recently discovered this suite of controls that makes this kind of thing
easier than I would have imagined it could be:
http://www.dart.com/powerweb/livecontrols.asp