Custom Validation Control Client side event

rodmcleay · #1 (**permalink**) December 15th, 2004, 10:27 PM

Hi,

A have the need for a custom validation control to test the comination of a textbox being checked and that a field is not left blank.
It appears that the custom validation event does not fire when the ControlToValidate is left blank.
I cant use the RequiredFieldValidator because it does not allow me to test the checkbox.

I guess I could put in a hidden textbox and use it as the ControlToValidate with some content just to fire the client event.
And then test the correct field length throught javascript ignoring the args.Value of the validator.

BUT this seems like a poor method.
Doen anyone know the correct way to do this.

An simplified example of the situation is below.
This ignores the checkbox situation but if the code is run you will see that the client side event only fires when something is in the textbox.

Code:

<HTML>
  <HEAD>

        <script language="JavaScript">
function validateNumber(oSrc, args) {
alert('Boo');
args.IsValid = (args.Value.length > 3);
}
        </script>
</HEAD>
    <body>
        <form runat="server" ID="Form1">
            <p>
                Number:
                <asp:TextBox id="TextBox1" runat="server"></asp:TextBox>
                &nbsp;
                <asp:CustomValidator id="CustomValidator1" runat="server" ControlToValidate="TextBox1" ErrorMessage="The input must have at least 4 characters"
                    ClientValidationFunction="validateNumber"></asp:CustomValidator>
            </p>
            <p>
                <asp:Button id="Button1" runat="server" Text="Button"></asp:Button>
            </p>
            <p>
                <asp:Label id="Label1" runat="server"></asp:Label>
            </p>
        </form>
    </body>
</HTML>

Any assistance would be appreciated

======================================
They say, best men are molded out of faults,
And, for the most, become much more the better
For being a little bad.
======================================

Renu · #2 (**permalink**) December 16th, 2004, 01:38 AM

I have exactly same problem. I need to test two textboxes. If you look at my thread that is still active:-
http://p2p.wrox.com/topic.asp?TOPIC_ID=23253

I cannot use customvalidator or requiredfield validator. I am planning to test it on the server side. Let me know if you find a better solution. I guess this is the only solution.

mehdi62b · #3 (**permalink**) December 16th, 2004, 06:12 AM

Quote:

quote:Originally posted by Renu

I cannot use customvalidator or requiredfield validator...

Hi again,
no,you can use them but in server-side(now in server-side you cant show po pup window anymore).

_____________________________
Mehdi.
software engineering student.
Looking for a good job for summer 2005.

mehdi62b · #4 (**permalink**) December 17th, 2004, 08:47 AM

Hi Rod,
There are two ways in this regard,
1-you want to validate them on the serve-side,
2-you want to validate them on the client-side,
it's clear checking them on the client-side results in better performance,so if you want to work-
on the client-side it's better to ignore such validators and work just with JavaScript,there would
be no need for hidden textboxes anymore,
but if you want to work on the server-side,you can use such validators easier,
(but ignore client-side facilities like showing po pup windows and ...),
(for more info you can have a look at Renu's thread).

_____________________________
Mehdi.
software engineering student.
Looking for a good job for summer 2005.

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