Question

How i put validation on check box?

Here is my code:

<script>
function Validate(){
   var cntct = document.getElementById("contact").value;
   if (cntct.value=="")
   {
      alert("Please select contact medium");
      return false;
   }
}
</script>

<input type="radio" name="contact" id="contact" value="SMS">
<label>SMS</label> <input type="radio" name="contact" id="contact" value="CALL">
<label>CALL</label> <input type="radio" name="contact" id="contact" value="EMAIL">
<label>EMAIL</label>

please help..

Answer 1

in case of checkboxes and radiobuttons, the element is checked when the “checked” property is true:

function Validate(){
    var selectedValue = "";
    var cntct = document.getElementsByname("contact");
    for(var i=0;i<cntct.length;i++) {
        if (cntct[i].checked)
        {
            selectedValue = cntct.value;
        }
    }
    if(selectedValue == "") {
        alert("Please select contact medium");
        return false;
    }
    return true;
}

UPDATE

I just noticed that you have multiple elements with the same ID. This is not allowed, in such case the browser will return only the last element with that ID. You need to iterate over the elements with the same name and pick one with attribute checked. See the code above