radio list validation

[shihabca]

how to validate a radiolist for being left unchecked, using javascript

[Niheel]

Here is sample code on radio list validation:

 
<script language = "Javascript">
var form='form1'
function ValidateRadio()
{
var radio_choice = false;
 for (counter = 0; counter < radio_form.radio_button.length; counter++)
 {
  if (radio_form.radio_button[counter].checked)
   radio_choice = true; 
 }
 if (!radio_choice){
  alert("Please select Yes, No or Maybe.")
  return (false);
 }
 return (true);
}
// -->
</script> 
 
<form name="radio_form" method="get" action="#" onSubmit="return ValidateRadio()">
 <input name="radio_button" type="radio" value="yes" />Yes
 <input name="radio_button" type="radio" value="no" />No
 <input name="radio_button" type="radio" value="no" />Maybe
<input type='submit' name='' value='Submit'>
</form>
 

[acoder]

<script language="javascript">

should be

<script type="text/javascript">

The language attribute is deprecated.

The code posted uses the form name globally. It should be accessed via document or document.forms or by using an id and document.getElementById(), e.g.

var radio_form = document.radio_form;
// alternatively
//radio_form = document.forms["radio_form"];
// another alternative:
// radio_form = document.getElementById("radio_form");
// which would require the form to have an id:
<form name="radio_form" id="radio_form" ...>