how to put validation on Textbox ?

Abhishek Kumar · #1 (**permalink**) November 21st, 2011, 10:43 PM

Dear Imar Sir,
I have created a contact form in which there is a textbox for Mobile number
in india the mobile number is of 10 digit exactly failing which means mobile
number is incorrect. That is why i would like to put validations on textbox
so that when any user put less than 10 digit in mobile number textbox he got
alert message Mobile number is incorrect. How to achieve it through c# programming.
I think such option is not availabele in textbox property.

Imar · #2 (**permalink**) November 22nd, 2011, 03:34 PM

Hi there,

You can use a CustomValidator or a RegularExpressionValidator to accomplish this. You'll need to Google a bit for the exact reg ex code.

Cheers,

Imar

Arielle12 · #3 (**permalink**) December 3rd, 2011, 01:58 AM

I'm using javascript with regard to customValidator to verify textboxes within ASP.Internet. The actual code works completely when I 'm using a normal web page, but as soon as I put which in the MasterPage, the actual code fails.

Beneath is the code with regard to my aspx web page. Basically put this signal inside a MasterPage it doesn't function. Could you guys advise me steps to make this work in the MasterPage
The actual piece of software is:-

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">

<script type="text/javascript">
function validateOrFields(source, args)
var sUser = document.getElementById('TextBox1');

if (sUser.value == "")

args.IsValid = false;

else

args.IsValid = true;

return;

<div>
<asp:TextBox ID="TextBox1"
runat="server"></asp:TextBox>
<asp:CustomValidator ID="FieldValidator"
runat="server"
Text="Enter either a user name"
ClientValidationFunction="validateOrFields" onservervalidate="FieldValidator_ServerValidate"/>
<asp:Button ID="Button1" runat="server" Text="Button" />
</div>
</form>
</body>
</html>

Imar · #4 (**permalink**) December 3rd, 2011, 06:37 AM

A master page changes the client side ID of your control. To fix the code, either update it by using the client ID of the control (look in the source for its new name) or use something like this instead:

'<%=Textbox1.ClientID%>'

Hope this helps,

Imar

Colton · #5 (**permalink**) December 15th, 2011, 07:53 AM

You can also make your own custom validation function. This may be very naive, but somehow it will work.
private bool WithErrors()
{
if(textBox1.Text.Trim() == String.Empty)
return true; // Returns true if no input or only space is found
if(textBox2.Text.Trim() == String.Empty)
return true;
// Other textBoxes.

return false;
}

private void buttonSubmit_Click(object sender, EventArgs e)
{
if(WithErrors())
{
// Notify user for error.
}
else
{
// Do whatever here... Submit
}
}

Need to download code?

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