Each member of the group has a value and a checked property. To get the value of the radio group or to see if one of the group has been checked, you have to loop through the radio group.
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html lang="en">
<head>
<title>check radio groups</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<meta name="author" content="Roderick Divilbiss">
<meta name="copyright" content="© 2005, 2006 Roderick Divilbiss">
<script type="text/javascript">
<!--
function isRadioChecked(fld) {
for (var idx=0;idx<fld.length;idx++)
if (fld[idx].checked)
return true;
return false;
}
function getRadioValue(fld) {
for (var idx=0;idx<fld.length;idx++)
if (fld[idx].checked)
return fld[idx].value;
return '';
}
//-->
</script>
</head>
<body>
<form name="frm">
Radios: 1:<input type="radio" value="1" id="r1" name="r1"> 2:<input type="radio" value="2" id="r1" name="r1"> 3:<input type="radio" value="3" id="r1" name="r1"> 4:<input type="radio" value="4" id="r1" name="r1"> 5:<input type="radio" value="5" id="r1" name="r1"> <input type="button" value="isRadioChecked" name="B1" onclick="alert(isRadioChecked(document.frm.r1));"> <input type="button" value="getRadioValue" name="B2" onclick="alert(getRadioValue(document.frm.r1));">
</form>
</body>
</html>
