Hi!!
How can i change the field names dynamically?
eg i have a radio button depending on whose choice i have to
make another field mandatory,

if Yes.
Field one is mandatory
Else
Field one is optional.

For a mandatory field i have the validation funciton as well, that it cannot be empty...
any Ideas ?
thanks......

Let you have a radiobuttonlist named rdoType.

if(document.getElementById('ctl00_allcontent_rdoType_0').checked)
{
if(document.getElementById('<%= TextBox1.ClientID %>').value.length>0)
return true;
else
return false;
}
else
{
if(document.getElementById('<%= TextBox2.ClientID %>').value.length>0)
return true;
else
return false;
}

Here validating TextBox1 or TextBox2 based on radio item seletion. So create a javascript function & use it.

You can use the code provided by mail2saion to validate your field. And you can try this basic example to change the names in your field's:

<form name="frm">
<div>
<label>Default Text <input type="radio" value="" onclick="(  this.parentNode.childNodes[0].nodeValue = ( !frm.elements[1].checked ) ? 'Mandatory' : 'Optional' ); frm.elements[1].parentNode.childNodes[0].nodeValue = 'Optional';"></label> <label>Default Text <input type="radio" value="" onclick="(  this.parentNode.childNodes[0].nodeValue = ( !frm.elements[0].checked ) ? 'Mandatory' : 'Optional' ); frm.elements[0].parentNode.childNodes[0].nodeValue = 'Optional';"></label>
</div>
</form>

hope it gets what you need...

Sorry, couldn't really understand that..
i am posting this, to make it more clear hopefully,

this is the validation code i am using :

if (form.ATTACH_APPROVAL_FROM_CUSTOMER_PATH.value == "")  
  {
   alert("PleaseAttatch Approval From Customer");
   form.ATTACH_APPROVAL_FROM_CUSTOMER_PATH.focus();
   return false;
 }

This is the field on who's value the next field depends :

<!-- Customer Sign Off -->
<tr>
<td height="25" bgColor=#eeeeee class='cellDesc' width="35%"> Customer Sign Off <font color='#ff0000'>*</font> </td>
<td height="25" bgColor=#eeeeee>
<input type="radio" name="CUSTOMER_SIGN_OFF"  value="Y" size=2 checked tabIndex="7">Yes &nbsp
<input type="radio" name="CUSTOMER_SIGN_OFF"  value="N" size=2 tabIndex="7">No
</td>
</tr>

now depending on the answer to above, this following field should be optional or mandatory
if its optional i do not need to call the validation function and also remove the star (*) from the field name, otherwise
i call the validation function and keep the (*) as well..

<!-- attatch approval customer -->
<tr> 
<td height="25" bgColor=#eeeeee class='cellDesc' width="35%"> Attach Approval From Customer <font color='#ff0000'>*</font></td>
<td bgColor=#eeeeee>
<input type=file name="ATTACH_APPROVAL_FROM_CUSTOMER_PATH" class='cellData' maxlength="30" style="WIDTH: 302px; HEIGHT: 17px" size=45 title="Upload Customer Approval" tabIndex=13><font size="2"> </font> 
</td>
 </tr>

TRY WITH BELOW EXAMPLES:

if (document.forms[0].ATTACH_APPROVAL_FROM_CUSTOMER_PATH.value == "") {
		alert("Please select a file before submitting.");
		return false;
	}

OR

var objUpload=eval("document.getElementByName('ATTACH_APPROVAL_FROM_CUSTOMER_PATH')");
    var sUpload=objUpload.value;
    if(sUpload!="")
        {}
else return false;

Did your validation method works? if not then you can try with my above post.

AT FIRST TRY TO VALIDATE FILE INPUT FILE THEN GO FOR NEXT STEP.

well i am done with the validation part
now what is remaining is
i need the name to be
attatch approval from customer *
is its mandatory

and
attatch approval from customer
(star removed)
if its optional

Did you mean Since user select a file to upload & its now depends on CUSTOMER_SIGN_OFF value? Based on CUSTOMER_SIGN_OFF value you have to decide to start upload or not? R u trying to catch the radio button value?

well what it need is
if value in radio button is Yes
then second fields is compulsory ( to indicate compulsory field i use a star after the name )
and if value in radio button is No
then second field is optional ( and i don't show a star after the field name )

<html>
<head>
<title>Change Font Color JavaScript</title>
<script type="text/javascript">
function changeColor()
{
  document.getElementById("color1").style.color="#FF0000";
  
}

function defaultColor()
{
  document.getElementById("color1").style.color="";

}
</script>
</head>

<body>
<span id="color1">Red color</span><br>
<input type="text" onchange="changeColor();")

<br> <br>
<a href="javascript:defaultColor()">Change default Font Color JavaScript</a>
</body>
</html>

so i am making something like the program above...
it isn't working.... can you help me with this ?

Based on your requirement here i developed an example which i want to share with you & hope it will help you. Here i take a textbox & a label. label shows does the textbox value is required or not based on radio button. Take a new page & Run the example:

<script type="text/javascript">
function changeColor()
{
  document.getElementById('<%= Label1.ClientID %>').style.color="#FF0000";
  if(document.getElementById('<%= TextBox3.ClientID %>').value=="")
    document.getElementById('<%= Label1.ClientID %>').innerText="Must Entry !";
}

function defaultColor()
{
  document.getElementById('<%= Label1.ClientID %>').style.color="";
  document.getElementById('<%= Label1.ClientID %>').innerText="Optional";
}
</script>
<asp:TextBox ID="TextBox3" runat="server"></asp:TextBox>
        <asp:Label ID="Label1" runat="server" Text="Optional"></asp:Label><br />
        <br />
<input type="radio" name="CUSTOMER_SIGN_OFF"  value="Y" size=2 onclick="changeColor();">Yes &nbsp
<input type="radio" name="CUSTOMER_SIGN_OFF"  value="N" size=2 checked="checked" onclick="defaultColor();">No
function defaultcolor()
  {
    document.getElementById("color1").style.color='#ff0000';
  }
function changecolor()
 {
       document.getElementById("color1").style.color='#eeeeee';
 }

Well , i used this and

<span id="color1" >*</span>

and called the functions on "onclick" event of radio buttons...

thanks a lot for your help...

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