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copied!<p>As Carlos Granados said you have basically two options:</p> <ol> <li><p>Create a separate Symfony actions that takes a country as parameter and returns a list of associated regions in XML or JSON format. (You can use <code>Symfony\Component\HttpFoundation\JsonResponse</code>to send a JSON response, however, there is no corresponding <code>XmlResponse</code> class). Use <a href="http://jquery.com" rel="nofollow">jQuery</a> (or any other JS library or even plain Javascript) to send a request to the server whenever a user changes the currently selected item. In the callback (when you retrieved the response in the Javascript) you can update the region select box. You may find the documentation of <a href="http://api.jquery.com/jQuery.get/" rel="nofollow">jQuery Ajax</a> interesting.</p></li> <li><p>You store a list of all countries and its associated regions in your HTML code (you can use JSON or generate a native Javascript array) and whenever a user changes the value of the country select box you just have to replace the list of regions in the regions select box.</p></li> </ol> <p>The second method has a heavier load on the initial loading of the form since all countries and its associated regions must be loaded (from the database or a text file or wherever you store them) and rendered in a format that can be easily read by JS.</p> <p>The first method however must send a request every time a user selects another country. Additionally you have to implement another action.</p>

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