Liferay DWR portlet

Download portlet from following link

https://sourceforge.net/projects/meeralferay/files/LiferayDWR/

Steps to create DWR Portlet

Create MVC portlet using Liferay IDE

Configure DWR serve let in  portlet web.xml file.

<servlet>                         <servlet-name>dwr-invoker</servlet-name>                         <servlet-class>org.directwebremoting.servlet.DwrServlet</servlet-class>                         <init-param>                                     <param-name>debug</param-name>                                     <param-value>true</param-value>                         </init-param>                         <init-param>                                     <param-name>activeReverseAjaxEnabled</param-name>                                     <param-value>true</param-value>                         </init-param>                         <init-param>                                     <param-name>crossDomainSessionSecurity</param-name>                                     <param-value>false</param-value>                         </init-param>                         <init-param>                                     <param-name>initApplicationScopeCreatorsAtStartup</param-name>                                     <param-value>true</param-value>                         </init-param>                         <init-param>                                     <param-name>maxWaitAfterWrite</param-name>                                     <param-value>-1</param-value>                         </init-param>                         <load-on-startup>1</load-on-startup>             </servlet>             <servlet-mapping>                         <servlet-name>dwr-invoker</servlet-name>                         <url-pattern>/dwr/*</url-pattern>             </servlet-mapping>

Create dwr.xml file in WEB-INF directory of your portlet

Add following tags in dwr.xml

<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE dwr PUBLIC "-//GetAhead Limited//DTD Direct Web Remoting 2.0//EN" "http://getahead.org/dwr/dwr20.dtd"> <dwr>   <allow>      </allow> </dwr>

Create Java class based on your need

In my example my java class is com.meere.dwr.Person.java

Configure java class in dwr.xml files

<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE dwr PUBLIC "-//GetAhead Limited//DTD Direct Web Remoting 2.0//EN" "http://getahead.org/dwr/dwr20.dtd"> <dwr>   <allow>    <create creator="new" javascript="Person">       <param name="class" value="com.meera.dwr.Person"/>     </create>   </allow> </dwr>

Access your java class in your jsp page i.e.  Client side

Add following java script file in your jsp

<script type='text/javascript' src='<%=renderRequest.getContextPath()%>/dwr/interface/Person.js'> </script> <script type='text/javascript' src='<%=renderRequest.getContextPath()%>/dwr/engine.js'> </script>

Note:

In above Person.js and engine.js file physically not existed any where  don’t worry .

And whatever the attribute value you used for JavaScript in dwr.xml file  by that name your client side java script will be created i.e. in my case Person.js

dwr.xml

<create creator="new" javascript="Person">

      <param name="class" value="com.meera.dwr.Person"/>

    </create>

Java script call in jsp page

<script type='text/javascript' src='<%=renderRequest.getContextPath()%>/dwr/interface/Person.js'> </script>

Engine.js is common for all….

<script type='text/javascript' src='<%=renderRequest.getContextPath()%>/dwr/engine.js'> </script>

Final code in jsp page

<script type='text/javascript' src='<%=renderRequest.getContextPath()%>/dwr/interface/Person.js'> </script> <script type='text/javascript' src='<%=renderRequest.getContextPath()%>/dwr/engine.js'> </script> <h1>Sample Liferay DWR portlet</h1> <button id="checkDwr">GetName Using DWR</button> <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"> </script> <script> $(document).ready(function(){   $("#checkDwr").click(function(){          Person.getData(42, {                 callback:function(str) {                   alert(str);                 }               });   }); }); </script>

Liferay version 6.1x

More details go through following links

http://directwebremoting.org/dwr/introduction/getting-started.html

http://directwebremoting.org/dwr/introduction/scripting-dwr.html