I need help on custom required field validation, reall urgent please

ysfkay · March 18th, 2009, 12:42 PM

I am a rookie programmer,
I am trying to create a requiredfield validator using the custom control available in .Net. I know about the inbuilt validators, but the case is that I need to create custom server side validators, therefore I dont want to mix the inbuilt client side validation controls that come with dotnet and the custom server side validators that I need to build. This is why I need to create a custom serverside textbox required field validator. But all efforts failed.THis is what I tried.

protected void e_serverValidate(................................. ... args)
{
if(TextBox1.Text.Trim()=="")
args.IsValid=false;
else
args.isValid=true;
}
Please how am I suppose to write the appriopriate code . Csharp, thank you

pavithrashri · March 19th, 2009, 03:42 AM

y cant u try through scripts lik

<script runat="server">
Sub user(source As object,args As ServerValidateEventArgs)
if len(args.Value)<8 or len(args.Value)>16 then
args.IsValid=false
else
args.IsValid=true
end if
End Sub
</script>

<html>
<body>

<form runat="server">
<asp:Label runat="server" Text="Enter a username: " />
<asp:TextBox id="txt1" runat="server" />
<asp:Button Text="Submit" runat="server"/>
<br />
<asp:Label id="mess" runat="server"/>
<br />
<asp:CustomValidator
ControlToValidate="txt1"
OnServerValidate="user"
Text="A username must be between 8 and 16 characters!"
runat="server"/>
</form>

</body>
</html>

or see this link

http://www.dotnetcurry.com/ShowArtic...ookieSupport=1

dinesh · March 20th, 2009, 02:53 AM

function Validate()
{
var ctrl=document.getElementById("ur control id");

if(Trim(ctrl.value) == "")
{
alert("should not be empty!");
ctrl.focus();
return false;
}
return true;
}

on the click event of the submit button, use
onclick="if(!Validate())return false;"

dinesh · March 20th, 2009, 03:03 AM

hi friends,
dont use asp:CustomValidator, try to write ur own code for validations.

Imar · March 20th, 2009, 01:46 PM

>> dont use asp:CustomValidator, try to write ur own code for validations

Can you explain the reasonimg behind that statement? Why wouldn't you use the CustomValidator? It's a useful control if used properly....

Imar

ysfkay · March 20th, 2009, 02:17 PM

Quote:

Originally Posted by dinesh

hi friends,
dont use asp:CustomValidator, try to write ur own code for validations.

I thought if I used the custom validator, then I could reuse it and I wouldnt need to use labels to display the error messages...But do U suggest its better to write my own required field validator in a button click event instead...actually thats easier for me but I was studying a book asp 3.5 unleashed, its my first shot at asp, so I thot I could write a custom serverside required field validator that executes at the server along with the other custom server side validations I need to make..

ysfkay · March 20th, 2009, 02:19 PM

I thought if I used the custom validator, then I could reuse it and I wouldnt need to use labels to display the error messages...But do U suggest its better to write my own required field validator in a button click event instead...actually thats easier for me but I was studying a book asp 3.5 unleashed, its my first shot at asp, so I thot I could write a custom serverside required field validator that executes at the server along with the other custom server side validations I need to make..

Imar · March 21st, 2009, 05:39 AM

Quote:

I need to create custom server side validators

Do you really need that? That is, do you really need to write your own validation control or do you simply want to use that control?

You could use a CustomValidator, set up a server side and optionally a client side validation function and be done with it. That's how you typically use the control.

What would be your reason for writing your own? Do you have specific validation rules you want to reuse across sites or pages and that you want to embed in your own control?

Cheers,

Imar