validation in radio list control in asp.net

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ASP.NET

How i can apply javascript validation to check atleast one radiobutton list option is selected.

(Thanks in advance.)

Posted 4-Mar-11 20:42pm

Anuj kumar jain

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3 solutions

Solution 3

C#

<script type="text/javascript">
var wasOkPressed = false;
// Create an array of your checked controls
var controlArray = [ '<%= RadioButtonList1.ClientID %>'];
function validate() {
    wasOkPressed = false;
    // Loop through each control
    for(var i = 0; i < controlArray.length; i ++) {
        if (!wasOkPressed ) { // If ok was not pressed keep validating
            if (!validateRBL(controlArray[i])) {
                // If control fails to validate return false
                return false;
            }
        }
        wasOkPressed=true;
    }
    return true;
}
function validateRBL(RBLid)
{
 var listItemArray = document.getElementsByName(RBLid);
 var isItemChecked = false;
     for (var i=0; i<listItemArray.length; i++)
     {
        var listItem = listItemArray[i];
          if ( listItem.checked )
          {
           //alert(listItem.value);
           isItemChecked = true;
          }
     }
     if ( isItemChecked == false )
     {
         var answer = confirm ("Please confirm selection...")
         if (answer)
         return true;
         else
         return false;
     }
 return true;
}
</script>

XML

<asp:RadioButtonList ID="RadioButtonList1" runat="server">
      <asp:ListItem Value="1">Check 1</asp:ListItem>
      <asp:ListItem Value="2">Check 2</asp:ListItem>
  </asp:RadioButtonList>
  <input type="button" value="Validate Radio List" onclick="validate()" />

If i misunderstand your question, please feel free to correct me.
I hope the above information will be helpful. If you have more concerns, please let me know.

Posted 4-Mar-11 21:32pm

Monjurul Habib

Solution 2

The whole point of a group of radio buttons is that one and only one is always selected: you don't need to validate this...

Posted 4-Mar-11 21:16pm

OriginalGriff

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dongavipul · Accepted Answer · 2011-03-04T21:07:00

hi,
I have validation radio button following way

C#

<script type="text/javascript" mode="hold" />function getName1()
{
    var rbCount = 0;
    var rbtable = document.getElementById('rblistInterests'); // Table Name => Your Radiobuttonlist ID
    var rbtr = rbtable.getElementsByTagName('tr');
    for(var i=0; i< rbtr.length;i++)
    {
        var rbtd = rbtr[i].getElementsByTagName('td');
        for(var j=0; j < rbtd.length; j++)
        {
            var rbinput = rbtd[j].getElementsByTagName('input');
            var rblabel= chktd[j].getElementsByTagName('label');
            for(k=0;k < rbinput.length;k++)
            {
                var rbopt = rbinput[k];
                if(rbopt.checked)
                {
                  return true; // At least one readio button selected.
                }
            }
        }
    }
    return false; // no one readiobutton selected.
}&lt;/script&gt;

I have radio button this way

XML

<asp:RadioButtonList runat="server" ID="rblistInterests" RepeatColumns="3" RepeatDirection="Vertical" RepeatLayout="Table">
        </asp:RadioButtonList>

Now take one button and take onclientclick event and call this function if atleast one readio button is selected then it is return true otherwise it is return false.