未定题目

I am developing the JSP portlet using plugin sdk.

I want to implement AJAX in this portlet.

I am facing the problem while sending the URL in

jQuery.ajax({
type: "GET",
url: "/changemode.jsp",
data: "modeVal=rahul",
success: function(msg){
alert( "Data Saved: " + msg );
}});


the changemode.jsp is @ same location as the calling JSP.

It doest show any error msg, but the changemode.jsp is not get called.

Please advice.

Thanks in advance.

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you need to pass url like that

var url = '<portlet:renderURL windowState="<%= LiferayWindowState.EXCLUSIVE.toString() %>"><portlet:param name="struts_action" value="/ext/search/changemode" /></portlet:renderURL>';

and struts action entry should be in struts-config.xml and tiles-defs.xml

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Use the serveResource() method (javax.portlet.GenericPortlet):

 1     public void serveResource(ResourceRequest request, ResourceResponse response)
 2             throws PortletException, IOException {
 3        
 4         // Make the parameter "modeVal" available in changeMode.jsp
 5         String modeVal = ParamUtil.getString(request, "modeVal");
 6         request.setAttribute("modeVal", modeVal);
 7        
 8         // Dispatch to changeMode.jsp
 9         PortletRequestDispatcher dispatcher = getPortletContext().getRequestDispatcher(
10                 "/WEB-INF/jsp/changeMode.jsp");
11         dispatcher.include(request, response);
12     }

In your jsp, set the url to <portlet:resourceURL/> :

1 jQuery.ajax({
2 type: "GET",
3 url: "<portlet:resourceURL />",
4 data: "modeVal=rahul",
5 success: function(msg){
6 alert( "Data Saved: " + msg );
7 }});

If you need to handle dispatching to more than one page, specify an id like this:

1 <portlet:resourceURL id="changeMode" />

Check the id in serveResource() to decide where to dispatch the request.

1 if( request.getResourceID().equals("changeMode")) {
2 . . .
3 }

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It is really helpful .... now i'm one step ahead ...

I have some question regarding serveResource() method .....

1. should i write a servlet class which extends form GenericServlet and implement serveResource() method.

2. But in that case while calling that servlet from jsp with url <portlet:resourceURL /> what
should my url mapping of <servlet-mapping> in web.xml

3. Is it possible to set session a value in the same servlet and use it later.

4. On which object should i set session. PortletSession or HttpSession.

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Hi Rahul, good to hear that you're making progress!

Now, for your additional questions ...

1. Extend javax.portlet.GenericPortlet , example:

 1 package com.example.portal.test.ajax;
 2
 3 import java.io.IOException;
 4
 5 import javax.portlet.GenericPortlet;
 6 import javax.portlet.PortletException;
 7 import javax.portlet.PortletRequestDispatcher;
 8 import javax.portlet.RenderRequest;
 9 import javax.portlet.RenderResponse;
10 import javax.portlet.ResourceRequest;
11 import javax.portlet.ResourceResponse;
12
13 import com.liferay.portal.kernel.util.ParamUtil;
14
15 public class AjaxPortlet extends GenericPortlet {
16    
17     @Override
18     public void serveResource(ResourceRequest request, ResourceResponse response)
19             throws PortletException, IOException {
20        
21         // Make the parameter "modeVal" available in changeMode.jsp
22         String modeVal = ParamUtil.getString(request, "modeVal");
23         request.setAttribute("modeVal", modeVal);
24        
25         // Dispatch to changeMode.jsp
26         PortletRequestDispatcher dispatcher = getPortletContext().getRequestDispatcher(
27                 "/WEB-INF/jsp/changeMode.jsp");
28         dispatcher.include(request, response);
29     }
30    
31     @Override
32     public void doView(RenderRequest request, RenderResponse response) throws PortletException, IOException {
33         PortletRequestDispatcher dispatcher = getPortletContext().getRequestDispatcher("/view.jsp");
34         dispatcher.include(request, response);
35     }
36
37 }

2. Specify the above portlet class in /WEB-INF/portlet.xml :

1 <portlet-class>com.example.portal.test.ajax.AjaxPortlet</portlet-class>

3. and 4. If you're not using servlets in your application, use PortletSession. If you need to share session between servlet and portlet, refer to this article.

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but now i'm confused because i already have an entry in portlet.xml for <portlet-class> so,

can a portlet have more than one <portlet-class> and if yes what property needs to be set.

If not then can you suggest any other way ....

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You cannot have more than one entry for <portlet-class> in portlet.xml

Is your existing entry com.liferay.util.bridges.MVCPortlet ? This class extends LiferayPortlet which extends GenericPortlet. MVCPortlet implements serveResource() like this:

 1     public void serveResource(
 2             ResourceRequest resourceRequest, ResourceResponse resourceResponse)
 3         throws IOException, PortletException {
 4
 5         String jspPage = resourceRequest.getParameter("jspPage");
 6
 7         if (jspPage != null) {
 8             include(
 9                 jspPage, resourceRequest, resourceResponse,
10                 PortletRequest.RESOURCE_PHASE);
11         }
12         else {
13             super.serveResource(resourceRequest, resourceResponse);
14         }
15     }

If this does not suit your needs, you have to replace the entry in <portlet-class> with your own extension of GenericPortlet (e.g., AjaxPortlet).

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