JS gets the tag which originally called the JS method. It can then read the value on the original 'input' tag
<html>
<head>
<script>
function flipFormTarget(e) {
alert(e.value)
document.getElementById('old-form').setAttribute('action', e.value);
}
</script>
</head>
<body>
<br><input type = 'radio' value = 'top one' onclick="flipFormTarget(this)" checked>top option
<br><input type = 'radio' value = 'bottom one' onclick="flipFormTarget(this)"> bottom
</body>
</html>
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