title: rename file that user uploads javascript
body: <p>I have the following html on a form:</p>
  
  <pre><code>&lt;input type="file" name="uploadField" /&gt;
  </code></pre>
  
  <p>When users click on the browse button they can select any file but I want to rename the file using the value of another field on the form</p>
  
  <p>I have a submit button. Can I do it here? </p>