上传表单的文件而不提交

Question

Currently I have the following code:

  <div id="insertreading">Insert Reading</div>
        <form id="confirmreadingform" enctype="multipart/form-data" method="post" style="display: none;">
          <input id="uploadreading" name="fileToUpload2" type="file" value="Upload Resources"/>
       </form>
    </div>
    <div id="submitchanges">Submit Changes</div>

Basically I want it so that when submitchanges is clicked, it will take the file the user has entered in the form and a php script will process/get the file(using $_FILES). I know I could just use an action="upload.php" in the form but is it possible without it. Would I need to use Ajax?

Is the following correct:

var formData = new FormData($("#confirmreadingform"));
    formData.append('reading', $('#uploadreading'));
    $.ajax({
        type: 'POST',
        url: 'upload.php',
        data: formData,
         success: function (data) {
           alert(data)
         },
    });