Getting Started with Reverse Ajax
To use Reverse Ajax in passive mode (piggyback only) no configuration is required. To enable active Reverse Ajax, 2 configuration steps are needed.
The first step is to allow active Reverse Ajax from the server. This is a server configuration for security reasons. All that is needed is a few of lines in your WEB-INF/web.xml:
<servlet> <servlet-name>dwr-invoker</servlet-name> <servlet-class>org.directwebremoting.servlet.DwrServlet</servlet-class> <init-param> <param-name>activeReverseAjaxEnabled</param-name> <param-value>true</param-value> </init-param> ... </servlet>
The second step is to request active Reverse Ajax in a web page. This begins a Comet/polling cycle. Just call the following as part of the page load event:
There are further configuration options, to allow finer control of connection times, and to manage proxy interactions.