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<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
</head>
<body>
<select id="select">
<option>jquery</option>
<option>php</option>
<option>angularjs</option>
</select>
<script>
$(document).ready(function () {
$("#select").on("click", function() {
if ($("#select option").length == 0) {
alert("not displayed");
} else {
alert("displayed");
}
});
});
</script>
</body>
</html>
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