Listen for input change programmatically | Vanilla JS

listen_for_input_change_programatically.js

<script type="text/javascript">

let event = new Event('change');
let inputBox = document.querySelector("#shipping_postcode");

const descriptor = Object.getOwnPropertyDescriptor(Object.getPrototypeOf(inputBox), 'value');

Object.defineProperty(inputBox, 'value', {
    set: function(t) {
    	if(t === '') return;
        return descriptor.set.apply(this, arguments);
    },
    get: function() {
      return descriptor.get.apply(this);
    }
});

</script>