JSFiddle - React, Tailwind, and code Playground

HTML

<input type="text" name="foo" maxlength="4" />

JavaScript

$('input:text').live('keydown', function (event) { 
 
            if ((event.keyCode < 48 || event.keyCode > 57) && (event.keyCode < 96 || event.keyCode > 105) && (event.keyCode != 8)) { 
                event.preventDefault(); 
            } 
 
        });