JSFiddle - React, Tailwind, and code Playground

HTML

<input class="btn-input order-count" type="text" >

JavaScript

$('body').on('click keypress', '.btn-input', function(key) {
  $this = $(this);
  $maxLen = 2;
  if (key.charCode < 48 || key.charCode > 57) return false;
  if ($this.val().length > $maxLen)
    $this.val($this.val().substr(0, $maxLen));
});