run time validation on a radiobutton list

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hi,
First of all,happy new year to all my friends.i have a page with a radiobuttonlist and a textbox.I need to put validation on a textbox such that if radiobutton selected item is 1 then textbox should accept 3 characters and if radiobuttonlist selected item is 2,then texbox shoult take exactly 10 characters.
thanks in advance.

Posted 1-Jan-12 21:46pm

Sanjeev236

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Tanveer A · Answer 1 · 2012-01-01T21:51:00

use javascript for that

add below function onclick event of radio button

XML

<script type="text/javascript">
function validate(ctr)
{
try
{
if (ctr.checked)
{
var txt=document.getElementByID(txtboxid).value;

if (txt.lenght>3 )
{
document.getElementByID(txtboxid).value='';
alert('TextBox lenght should be less than 10 character');
}
}

}
catch(Error)
{
alert(Error);
}

}