Issue obtaining values in server-side from dropdownlist when updating value using client-side script in master page


I got a page in a contentplaceholder of a master page. There is two pulldowns. I populate the first one using server side coding and then use client-side javascript. So far so good. The issue is that upon a postback I try to collect the select value of the second pulldown and there is no data in the pulldown and no selected item. 

I tried using control.selectedvalue (nothing) or searching the form controls

Stringvariable = oForm.FindControl("Control")

Thing is I've done this before in 1.1 outside of a master page and it works.

Thanks in advance for your help




9/8/2006 5:26:49 AM 24353 articles. 0 followers. Follow

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As you are using masterpage, you may try first find the contentplaceholder and then find control inside~
你好! Just FYI o_O
9/8/2006 5:58:04 AM

Thans for the reply. 

I'm able to find the control just fine. I'm using the following:

Dim oExprmt As DropDownList

Dim oForm As Control

 oForm = Master.FindControl("ContentPlaceHolder1")

oExprmt = oForm.FindControl("cmbExperiment")

strText = oExprmt.SelectedValue

I'm able to find both controls but when I try to get the value is = "".

Thing is I'm able to see the values in the page and select one of them but not to collect them in the server.


9/8/2006 2:59:38 PM

Is the list being databound again before you can check the value?  That will erase the current selection...

What happens if you try to get the value from Request.Form(myDDLname) instead? 


Peter Brunone
Do the impossible, and go home early.
9/8/2006 6:23:30 PM

The list is not been databound after postback. It should only contain the value assigned in the client side.

Using Request.Form(myDDLname) only returned empty. As if no data was ever selected in the client.


9/8/2006 7:01:34 PM

Try Response.Write(Request.Form.ToString()), to see if the name is what you expect it to be.


Peter Brunone
Do the impossible, and go home early.
9/8/2006 7:26:36 PM

That is interesting. followed your advise and the name of the control in the client is:


But on server side, the name of the control in the client is (using control.ClientID


 using either returns Nothing





But the instruction you provided shows


So the value is there, I just can not access the value.

9/8/2006 7:45:08 PM

That name from Request.Form has encoded characters.  If you call View Source on the page, you'll probably see what the *real* name is.

Of course this shouldn't be necessary (there should be a way to get the value from the control) but it's good to know you have other options like this.  I use Request.Form all the time in ELB to avoid ever having to touch Viewstate (keeps the users less confused when their values don't disappear after databinding).

Peter Brunone
Do the impossible, and go home early.
9/8/2006 7:57:53 PM

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