Untitled

CSS:
 div.ajax-progress {
      //some setting and url
}
<body>
   <div class="ajax-progress"></div>
</body>
Javascript:

$('#fileToUpload').on('change', function(e) {

            var file = e.target.files[0];
            var formData = new FormData($('form')[0]);
            imageId = cornerstoneWADOImageLoader.fileManager.add(file);


            $.ajax({
            url: 'loadfile.php',
            type: 'POST',
            data: formData,
            async: false,
            dataType: 'json',
            timeout : 60000,
            beforeSend :function(){
                $(".ajax-progress").show();
            }，
            success: function (html) {
           $(".ajax-progress").hide();
             //doing something}
        });
    });