var dateClass='.datechk';
$(document).ready(function ()
{
  if (document.querySelector(dateClass).type !== 'date')
  {
    var oCSS = document.createElement('link');
    oCSS.type='text/css'; oCSS.rel='stylesheet';
    oCSS.href='//ajax.googleapis.com/ajax/libs/jqueryui/1.12.1/themes/base/jquery-ui.css';
    oCSS.onload=function()
    {
      var oJS = document.createElement('script');
      oJS.type='text/javascript';
      oJS.src='//ajax.googleapis.com/ajax/libs/jqueryui/1.12.1/jquery-ui.min.js';
      oJS.onload=function()
      {
        $(dateClass).datepicker();
      }
      document.body.appendChild(oJS);
    }
    document.body.appendChild(oCSS);
  }
});