Databound Dropdown List and validation

[Ric Castagna]

Hello, all...

I'm trying to do a client-side validation on a databound dropdown
list.

All I want to do is check to see if the selected index is greater than
0 - an invalid option.

Here's the code I'm using, but I don't think the compare validator is
the right validation method to use. It, unfortunately, always thinks
there's an error.

<asp:dropdownlist id="ddlCategories" cssclass="adminText"
datatextfield="cat_desc" datavaluefield="cat_id" runat="server" />
<asp:comparevalidator id="cvCategories" operator="LessThan"
controltovalidate="ddlCategories" valuetocompare="1"
errormessage="Please select a category for this clip."
display="Dynamic" runat="server" />

I can't seem to find any postings on using validation against dropdown
lists on the client side, and I'd prefer to keep the validation there
as sending it server-side would really junk up the works.

Please help.

Thanks!

 

[Teemu Keiski]

Hi,

you can use RequiredFieldValidator for it, just set the InitialValue
property to the value of the first item in the DDL (the invalid one) and it
will then ensure that correct selection is made.