title: Pull URL variable into hidden form value
body: <p>If I add the hidden input field to a form:</p>
  
  <pre><code>&lt;input name="cf_person_partner" type="hidden" value="PartnerName" /&gt;
  </code></pre>
  
  <p>With the form being hosted on a landing page with the URL: </p>
  
  <p><a href="https://wb.workbooks.com/process/=QzM/Webinar_Portal?eventid=1048&amp;partner=lucid" rel="nofollow">https://wb.workbooks.com/process/=QzM/Webinar_Portal?eventid=1048&amp;partner=lucid</a></p>
  
  <p>How can I pull the partner value (in this instance <code>lucid</code>) from the URL into the value on the hidden input field so it becomes:</p>
  
  <pre><code> &lt;input name="cf_person_partner" type="hidden" value="lucid" /&gt;
  </code></pre>
  
  <p>Note: The site is hosted using Bootstrap and no Javascript is currently running (so I'll need to add this in).</p>