DropDownList event not firing as expected

[Mark Rae]

Hi,

Apologies, but I appear to be having a senior moment...

I have a standard DropDownList webcontrol with a SelectedIndexCh anged event,
as follows:

<asp:TableCel l ColumnSpan=4 VerticalAlign=M iddle>
Select your delivery location:
<asp:DropDownLi st ID="cmbShipping " Runat="server"
OnSelectedIndex Changed="cmbShi pping_SelectedI ndexChanged"
AutoPostBack="t rue">
<asp:ListItem Value="0">&nbsp ;</asp:ListItem>
<asp:ListItem Value="1">Unite d Kingdom</asp:ListItem>
<asp:ListItem Value="2">Europ ean Union</asp:ListItem>
<asp:ListItem Value="3">Rest of world</asp:ListItem>
</asp:DropDownLis t>
</asp:TableCell>
And the code-behind is as follows:

protected DropDownList cmbShipping;

private void Page_Load(objec t sender, System.EventArg s e)
{
if(!Page.IsPost Back)
{
BindData();
}
}

public void cmbShipping_Sel ectedIndexChang ed(object sender, EventArgs e)
{
try
{
BindData();
}
catch (Exception ex)
{
CApplication.Gl obalExceptionHa ndler(ex);
}
}

private void BindData()
{
// code to do the data binding goes here...
}
Problem is that the cmbShipping_Sel ectedIndexChang ed() event only fires if
the SelectedValue of the DropDownList is greater than zero i.e. if I change
it from 0 to any other value, the event fires, but if I change it back to
zero the event doesn't fire...No errors are raised and, if I place a
breakpoint on the BindData(); line within the event code, it doesn't even
appear to jump into it...

I'm clearly missing something totally obvious...

Any assitance gratefully received.

Mark

[Mark Rae]

"Mark Rae" <ma**@mark-N-O-S-P-A-M-rae.co.uk> wrote in message
news:uh******** ******@TK2MSFTN GP15.phx.gbl...

Problem is that the cmbShipping_Sel ectedIndexChang ed() event only fires if
the SelectedValue of the DropDownList is greater than zero i.e. if I
change it from 0 to any other value, the event fires, but if I change it
back to zero the event doesn't fire...No errors are raised and, if I place
a breakpoint on the BindData(); line within the event code, it doesn't
even appear to jump into it...

Not only that - the event fires even if other controls on the page trigger
the PostBack...

Anyone got any thoughts on this...?

[Patirck Ige]

Do you have any sort of validations on your page?
Patrick

"Mark Rae" <ma**@mark-N-O-S-P-A-M-rae.co.uk> wrote in message
news:eC******** ******@TK2MSFTN GP14.phx.gbl...

"Mark Rae" <ma**@mark-N-O-S-P-A-M-rae.co.uk> wrote in message
news:uh******** ******@TK2MSFTN GP15.phx.gbl...

Problem is that the cmbShipping_Sel ectedIndexChang ed() event only fires if the SelectedValue of the DropDownList is greater than zero i.e. if I
change it from 0 to any other value, the event fires, but if I change it
back to zero the event doesn't fire...No errors are raised and, if I place a breakpoint on the BindData(); line within the event code, it doesn't
even appear to jump into it...

Not only that - the event fires even if other controls on the page trigger
the PostBack...

Anyone got any thoughts on this...?

[Mark Rae]

"Patirck Ige" <na********@hot mail.com> wrote in message
news:eF******** ******@TK2MSFTN GP09.phx.gbl...

Do you have any sort of validations on your page?

There is a form with a submit button which checks that the DropDownList in
question doesn't have a selectedIndex of 0 before submitting it, as follows:

<script>

function submitPayPal()
{
if(document.frm Default.cmbShip ping.selectedIn dex == 0)
{
alert('Please select a delivery
location');docu ment.frmDefault .cmbShipping.fo cus();
return false;
}
}

</script>

And the corresponding HTML is:

<input type="submit" value="Proceed to checkout" onclick="return
submitPayPal(); ">