title: How to add an array value to new FormData?
body: <p>On form submission I'm using jQuery to gather data including files and creating a FormData Object of the form values using:</p>
  
  <pre><code>var formData = new FormData($("form#formid")[0]);
  </code></pre>
  
  <p>but how can I add another value and it's key to this FormData Object?</p>