I cannot seem to get the SelectedIndexChanged event to fire for my 
DropDownList boxes. 

For example, I have a Web Form with only two elements -- a TextBox and a 
DropDownList. The DropDownList has three items (which I added via the 
Properties window, Items collection). The Web Form has the following code, 
which should display the value of the selected item in the TextBox every 
time the user changes the selected item. But, this never happens. 

To test this further, I later placed a button on the page which assigns 
the selected item's value to the text box when clicked. This works. But, 
the DropDownList change event never seems to fire -- in spite of the fact 
that every tutorial indicates that it will. Is this a bug? 

Here's the code from the page. Why doesn't this work as expected?

' ========= the code snippet ============
Private Sub DropDownList1_SelectedIndexChanged(ByVal sender As 
System.Object, ByVal e As System.EventArgs) Handles 
DropDownList1.SelectedIndexChanged

        TextBox1.Text = DropDownList1.SelectedItem.Value

End Sub

Jamie,

	Did you set the DropDownList's AutoPostBack property to true?

Minh.

-----Original Message-----
From: Jamie Barger [mailto:jbarger@l...] 
Sent: Wednesday, April 10, 2002 10:47 PM
To: aspx_beginners
Subject: [aspx_beginners] SelectedIndexChanged event not firing on
DropDownList


I cannot seem to get the SelectedIndexChanged event to fire for my 
DropDownList boxes. 

For example, I have a Web Form with only two elements -- a TextBox and a

DropDownList. The DropDownList has three items (which I added via the 
Properties window, Items collection). The Web Form has the following
code, 
which should display the value of the selected item in the TextBox every

time the user changes the selected item. But, this never happens. 

To test this further, I later placed a button on the page which assigns 
the selected item's value to the text box when clicked. This works. But,

the DropDownList change event never seems to fire -- in spite of the
fact 
that every tutorial indicates that it will. Is this a bug? 

Here's the code from the page. Why doesn't this work as expected?

' ========= the code snippet ============
Private Sub DropDownList1_SelectedIndexChanged(ByVal sender As 
System.Object, ByVal e As System.EventArgs) Handles 
DropDownList1.SelectedIndexChanged

        TextBox1.Text = DropDownList1.SelectedItem.Value

End Sub

Hi,

I saw a thread on the same topic at this URL - maybe the solution there 
applies to you...

http://www.aspmessageboard.com/forum/aspplus.asp?M=384590&F=36&P=1

Cheers,

JON

try to assign value as

TextBox1.Text = DropDownList1.Items(DropDownList1.SelectedIndex).Value





                                                                                            
                    "Jamie Barger"                                                          
                    <jbarger@l...       To:     "aspx_beginners"                           
                    tar.com>              <aspx_beginners@p...>                     
                                         cc:                                                
                    04/11/2002           Subject:     [aspx_beginners] SelectedIndexChanged 
                    04:16 AM              event not firing on DropDownList                  
                    Please respond                                                          
                    to                                                                      
                    "aspx_beginner                                                          
                    s"                                                                      
                                                                                            
                                                                                            




I cannot seem to get the SelectedIndexChanged event to fire for my
DropDownList boxes.

For example, I have a Web Form with only two elements -- a TextBox and a
DropDownList. The DropDownList has three items (which I added via the
Properties window, Items collection). The Web Form has the following code,
which should display the value of the selected item in the TextBox every
time the user changes the selected item. But, this never happens.

To test this further, I later placed a button on the page which assigns
the selected item's value to the text box when clicked. This works. But,
the DropDownList change event never seems to fire -- in spite of the fact
that every tutorial indicates that it will. Is this a bug?

Here's the code from the page. Why doesn't this work as expected?

' ========= the code snippet ============
Private Sub DropDownList1_SelectedIndexChanged(ByVal sender As
System.Object, ByVal e As System.EventArgs) Handles
DropDownList1.SelectedIndexChanged

        TextBox1.Text = DropDownList1.SelectedItem.Value

End Sub