Radio Validator

Hi ranchers,

Below code attempts to validate the Gender radio button.
The error is that the objGender.length is undifined. Could you give me some help? Thanks.

<html>
<script language="javascript">   
            function checkForm(){
			
                var objGender = new Object();    
                var strMessageToUser = new String("");   
  
                objGender = document.getElementById("txtGender");     
				
                alert(objGender.length);   
                // To check that one of the radio buttons for Gender is selected   
                var radioChecked = false;				
				for (i=0; i < objGender.length; i++){   
                  if(objGender[i].Checked){
				  alert(i);
					radioChecked = true;
					strGender=objGender[i].value;
					}
				}
				if(radioChecked){
				}else{
					strMessageToUser = "Please check that one of the buttons for Gender is selected<br>";
				}
			}
               </script>   
    </head>   
    <body>   
        <form id="frmData" name="frmData" action="addmember"  
              method="post" >   
            <table border="0"  >   
                  <tr>   
                     <td>Gender</td>   
                     <td><input type="radio" id="txtGender" value="Male" name="txtGender"/>Male   
                         <input type="radio" id="txtGender" value="Female" name="txtGender"/>Female</td>   
                 </tr>
                 <tr>   
                     <td  >   
                     <td><input type="button" id="btnSubmit" name="btnSubmit" value="Submit" onclick="checkForm();" /></td>
                 </tr>   
             </table>   
        </form>   
    </body>   
</html>

"id" name must be unique one in whole HTML page. You just repeated 'txtGender' twice. Correct it.

After you fix your id problem, you can save yourself lot of code by using jQuery on your pages for things like this.

To check that one of the radio buttons is checked, the code would simply be:

I removed the ID, and correct to . And then the code can work as I expect.
Thanks.