title: How to pass values from external page to parent page in JSP
body: <p>I have a problem that I wanted to solve for my client. i hope that I will explain it well.
  let say that I have a JSP form with some fields of personal data and on same page is popoup button that opens another page with form that have fields for personal address to add in parent form page. The problem is that popup form came from external URL. How can I submit addres from child page to parent page? </p>
  
  <p>Thank you in advance.</p>
  
  <p>here is example what I ment</p>
  
  <p>MyForm - Parent form page:</p>
  
  <pre><code>&lt;html&gt;
      &lt;body&gt;
          &lt;input id="name" value ="John Smith" /&gt;
  
          &lt;input id="billingCity" value=""/&gt;
          ...
  
      &lt;/body&gt;
   &lt;/html&gt;
  </code></pre>
  
  <p>Address verifcation page:</p>
  
  <pre><code>&lt;html&gt;
      &lt;body&gt;
  
      &lt;form action ="https://foo.com/HandleAddressValidationResults.jsp"&gt;
          &lt;input id="city" value="Oregon" /&gt;
  
          ...
          &lt;input type="submit" value="Accept" /&gt;
      &lt;/form&gt;
      &lt;/body&gt;
  &lt;/html&gt;
  </code></pre>