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In javascript checked property of radio button can be used to determine whether it´s selected or not.
CheckedRadio.html:
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<html>
<title>CheckedRadio- anyforum.in</title>
<body>
<form name="myform">
A: <input type="radio" name="answer" value="A"/><br/>
B: <input type="radio" name="answer" value="B"/><br/>
C: <input type="radio" name="answer" value="C"/><br/>
D: <input type="radio" name="answer" value="D"/><br/>
<input type="button" value="submit" onclick="getSelected()"/>
</form>
<script type="text/javascript">
function getSelected(){
var radio=document.getElementsByName("answer");
for(var i=0;i<radio.length;i++){
if(radio[i].checked){
alert(radio[i].value);
}
}
}
</script>
</body>
</html>
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