Keyboard event for editbox

Cocos Creator
#1

Hello,
I want to show the warning label which fades in and out (tween) after MaxLength is reached and the user keeps on clicking at the keyboard key. I tried with TextChanged but it stops triggering after MaxLength is reached.
I even tried this :

addEventListener(Input.EventType.KEY_DOWN ,this.onKeyDown.bind(this));

But this only works perfectly well for desktop not for mobile.

#2

And if you process the length of the string manually? For example, the maximum string length should be 100 characters. Set maxLength to -1 (or 105, just in case you never know). When the event is triggered, if the string length exceeds 100 characters, display a warning, and do not display any further characters.