Jailbreak Iphone,keydown,keypress,keyup event does not trigger a problem

In the Jailbreak iphone, the input box input value will not trigger events such as Keydown,keypress,keyup, the specific reason is unknown.

If there is a need to monitor the input box value changes in real time and use one of the Keydown,keypress,keyup three events, there will be a problem.

Workaround :

Can use the HTML5 Oninput event to replace the KeyUp

<input type= "text" id= "Testinput" >
<script type= "Text/javascript" >
	document.getElementById (' Testinput '). AddEventListener (' input ', function (e) {
		var value = E.target.value;
	});
</script>