How to fire JQuery change event when input value changed programmatically?

Question

change event only fires when the user types into the input and then loses focus.

You need to trigger the event manually using change() or trigger('change')

$("input").change(function() {
  console.log("Input text changed!");
});
$("input").val("A").change();

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<input type="text" />