<html><head><script src="https://libs.baidu.com/jquery/2.1.4/jquery.min.js"></script><script>$(document).ready(function(){ $("button").click(function(){ $("input").change(); });});</script></head><body><p>Click the button to trigger the change event (even if the element has not been changed).</p><button>Trigger change event for input field</button><p>Enter your name: <input value="Donald" onchange="alert(this.value)" type="text"></p></body></html>