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// Define the JavaScript function
function onOptionChange() {
// Perform desired actions here
console.log("Option changed");
}
// Get a reference to the select element
var select = document.getElementById("mySelect");
// Add an event listener to the select element
select.addEventListener("change", onOptionChange);
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$("#select1").change(function() {
if ($(this).data('options') === undefined) {
/*Taking an array of all options-2 and kind of embedding it on the select1*/
$(this).data('options', $('#select2 option').clone());
}
var id = $(this).val();
var options = $(this).data('options').filter('[value=' + id + ']');
$('#select2').html(options);
});
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<script>
function val() {
d = document.getElementById("select_id").value;
alert(d);
}
</script>
<select onchange="val()" id="select_id">