title: bootstrap fileinput name in hidden textbox
body: <p>I am using jasny-bootrap fileinput:</p>
  
  <pre><code>&lt;div class="fileinput fileinput-new" data-provides="fileinput"&gt;
    &lt;span class="btn btn-default btn-file"&gt;&lt;span class="fileinput-new"&gt;Select file&lt;/span&gt;&lt;span class="fileinput-exists"&gt;Change&lt;/span&gt;&lt;input type="file" name="name"&gt;&lt;/span&gt;
    &lt;span class="fileinput-filename"&gt;&lt;/span&gt;
    &lt;a href="#" class="close fileinput-exists" data-dismiss="fileinput" style="float: none"&gt;&amp;times;&lt;/a&gt;
  &lt;input type="hidden" name="namehidden"/&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>When use select a file, how can I update the hidden file with a file name?</p>