Help with dropdownlist

[nomad]

Hi,

I have a databound dropdownlist. I have added
AppendDataBound Items="True" so that I am able to enter a item in the
dorpdownlist of "-- Please select --". I would like to be able to set
it so that this value isn't selectable because as it stands if they
select that value then my applicaiton will fall over.

Appreciate any help on this.

Thanks

[Mark Rae [MVP]]

Re: Help with dropdownlist

"nomad" <d.bedgood@o2.c o.ukwrote in message
news:a792637b-7121-4f10-84e7-f5b7043d2814@p2 5g2000hsf.googl egroups.com...

I have a databound dropdownlist. I have added
AppendDataBound Items="True" so that I am able to enter a item in the
dorpdownlist of "-- Please select --". I would like to be able to set
it so that this value isn't selectable because as it stands if they
select that value then my applicaiton will fall over.

Your application will not fall over if you write it properly.

Specifically, in this case, you need to start using validation on your
postbacks.

If it's not valid for a user to submit the form without selecting one of
"real" databound items in the DropDownList, then don't allow them to do
that.

E.g.

<script type="text/javascript">
function validateForm()
{
var myDropDownList =
document.getEle mentById('<%=My DropDownList.Cl ientID%>');
if (myDropDownList .selectedIndex < 1)
{
alert ('Please select an option');
myDropDownlList .focus();
return false;
}
}
</script>

<asp:Button ID="MySubmitBut ton" runat="server" Text="Submit"
OnClick="MySubm itButton_Click" OnClientClick = "return validateForm(); " />


--
Mark Rae
ASP.NET MVP

http://www.markrae.net

[nomad]

Re: Help with dropdownlist

On Aug 11, 10:37 am, "Mark Rae [MVP]" <m...@markNOSPA Mrae.netwrote:

"nomad" <d.bedg...@o2.c o.ukwrote in message
>
news:a792637b-7121-4f10-84e7-f5b7043d2814@p2 5g2000hsf.googl egroups.com...
>

I have a databound dropdownlist.  I have added
AppendDataBound Items="True" so that I am able to enter a item in the
dorpdownlist of "-- Please select --".  I would like to be able to set
it so that this value isn't selectable because as it stands if they
select that value then my applicaiton will fall over.

>
Your application will not fall over if you write it properly.
>
Specifically, in this case, you need to start using validation on your
postbacks.
>
If it's not valid for a user to submit the form without selecting one of
"real" databound items in the DropDownList, then don't allow them to do
that.
>
E.g.
>
<script type="text/javascript">
    function validateForm()
    {
        var myDropDownList =
document.getEle mentById('<%=My DropDownList.Cl ientID%>');
        if (myDropDownList .selectedIndex < 1)
        {
            alert ('Please select an option');
            myDropDownlList .focus();
            return false;
        }
    }
</script>
>
<asp:Button ID="MySubmitBut ton" runat="server" Text="Submit"
OnClick="MySubm itButton_Click" OnClientClick = "return validateForm(); " />
>
--
Mark Rae
ASP.NET MVPhttp://www.markrae.net

Hi Mark,

Thanks for the reply. I thought there may have been a setting which
allows you to set the first item as unselectable, without writing a
method to catch this.