JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8/themes/dot-luv/jquery-ui.css">
<select class="jquery-selectbox">
    <option value="">Select an url</option>
    <option value="http://google.com">google</option>
    <option value="http://yahoo.com">yahoo</option>
</select>

<div id="pane2">the layer where to load</div>

JavaScript

$(".jquery-selectbox").change(function(e) { 
    alert("yes");
                url = this.options[this.selectedIndex].value; 
                $('#pane2').fadeOut(500, function () { 
                    $('#pane2').fadeIn(500); 
              alert(url);
                }); 
});