JSFiddle - React, Tailwind, and code Playground

by Rosi Ramoreez

HTML

<input type="text" name="pin1" id="pin1">
<br>
<input type="text" name="pin2" id="pin2">

JavaScript

$('#pin1').keyup(function(){
    var pin1Len = $('#pin1').val().length;
    if(pin1Len==4){
         $('#pin2').focus();          
    }                
});