The document.getElementByName() method returns all the element of specified name.
<html>
<body>
<script type="text/javascript">
function mahi()
{
var allgenders=document.getElementsByName("gender");
alert("Total Genders:"+allgenders.length);
}
</script>
<form>
Male:<input type="radio" name="gender" value="male">
Female:<input type="radio" name="gender" value="female">
<input type="button" onclick="mahi()" value="Total Genders">
</form>
</body>
</html>
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