JSFiddle - React, Tailwind, and code Playground
HTML
<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.16/themes/base/jquery-ui.css">
<div id="datepicker"/>
JavaScript
$('#datepicker').datepicker();
$('#datepicker').datepicker("disable");
alert($( "#datepicker" ).datepicker( "isDisabled" ));
$('#datepicker').datepicker("enable");
$('#datepicker').datepicker('refresh');
alert($( "#datepicker" ).datepicker( "isDisabled" ));