Fire Jquery text change when selecting prefilled value

Question

I am copying over firstname into lastname field. This works well with new names on the page. However, after entering a few names the browser shows the history of names and if th

Answer 1

Don't rely on change event at this situation, prefer input event. Because change event only get triggered when the focus got blurred out from the particular text box.

$(document).ready(function() {
    $("#FName").on('input',function() {
      $("#LName").val(this.value);
    });
});