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<select name="test123" id="test123" onchange="testOnchange()">
<option>Chocolate</option>
<option>Candy</option>
<option>Taffy</option>
<option>Caramel</option>
<option>Fudge</option>
<option>Cookie</option>
</select>
<script>
$( "#test123" ).change(function() {
console.log("change");
});
function testOnchange() {
console.log("onchange");
}
</script>