title: Append data to formData object
body: <p>I seem not to get additionally data added to "formData".</p>
  
  <p>First i add my input file:</p>
  
  <pre><code>var form = $('#uploadForm')[0];
  var formData = new FormData(form);
  
  var input = $("#uploadPhoto")[0];
  //Add input file data to formData
  formData.append(input.name, input.files[0]);
  </code></pre>
  
  <p>This works just fine.<br>
  And my PHP <code>var_dump</code> after "ajax call" results:</p>
  
  <pre><code>array(1) {
    ["uploadPhoto"]=&gt;
    array(5) {
      ["name"]=&gt;
      string(5) "1.xls"
      ["type"]=&gt;
      string(24) "application/vnd.ms-excel"
      ["tmp_name"]=&gt;
      string(40) "..../tmp/phpmyn3E1"
      ["error"]=&gt;
      int(0)
      ["size"]=&gt;
      int(42799)
    }
  }
  </code></pre>
  
  <p>Now i'd like to add some extra data for passing on to the php script:</p>
  
  <pre><code>formData.append('usr', selectedUsr);
  formData.append(input.name, selectedUsr);
  formData.append('usr', 'usr: '+ selectedUsr);
  </code></pre>
  
  <p>When i now check my PHP var_dump, there is no "usr" data in array.<br>
  Why?</p>