Invoke Wdk Component from servlet

Hi,

I have a wdk component which holds 3 components(components are seperated by 3 vertical frames).The first frame lists documents.when a document in the 1st frame is selected,the servlet invoke thirdy party application to open the selected document in 2 Frame.Now servlet takes control and keep running to maintain session.Based on some events in third party application , i am getting object id in the servlet method.I am passing this objectid to a method in 3rd component to get document properties,so that i can populate those properties in 3rd Frame.My problem is i can set property values to all the TEXT controls using setValue() from component class,But the jsp page(3rd Frame) is not rendering the values.If i hit refresh button on Browser Window, it is rendering values.

Is there any way to initialize and reload the wdk component or refresh jsp page programmatically from servlet to render attributes in jsp page.

Why the controls values are not rendered in jsp page from behavior class?

Has any one have idea on this

Thanks,

Karthick

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Comments

CláudioGil

I'm not sure about the setup you have but I believe that webtop standard components normally generate a client event and when they are rendered the client event is executed and reloads the other frame. For example, the browser tree does something like that when you click a folder in it. If you have 3 components in a sort of cascade you could make each one setup a client event that loads the next frame possible with the postComponentJumpEvent(...) javascript function.

XdctmX

Have a look at the postServerEvent and registerClientEventHandler( in the WDK development guide......

You can use postServerEvent to fire a server event from the client.

******************************************************
postServerEvent The WDK event client script events.js provides a postServerEvent function that you can use to explicitly call a server event handler. This script is automatically included in all rendered forms. The signature of the postServerEvent is:
function postServerEvent(strFormId, strSrcCtrl, strHandlerCtrl,strHandlerMethod, strEventArgName, strEventArgValue);

where:
.strFormId: String ID of the form to submit. If null, the first form on the page is assumed.
.strSrcCtrl: String ID of control that fires the event (optional).
.strHandlerCtrl: String ID of the control that handles the event (optional).
.strHandlerMethod: String Java method name of the event handler in a class on the J2EE application server.
.strEventArgName: String Event argument name
.strEventArgValue: String Event argument value

Typically, postServerEvent is called from within a client-side event handler. For example:
<script>
function handleClick(srcObject)
{
postServerEvent(null, null, null, "onUpdateData", "objectId", id,"type", type);
}
</script>
******************************************************

Refer to Firing a server event from the client section in WDK development guide for details and examples.

Registering a client event handlerEvent handler registration provides control over where events are handled. WDK provides a registerClientEventHandler() method to register client event handlers. This script is automatically included in all pages rendered to the browser. The signature of the method is:

function registerClientEventHandler(strSrcWindowName, strEventName,fnEventHandler);

strSrcWindowName is the optional source frame or window name. strEventName is the event name. fnEventHandler is the event handler function pointer.If the source frame or window name is NULL, the event is handled by any parent window in the hierarchy regardless of which frame fired it. If the frame name is not null, the event is handled only if it was fired from the specified frame.The following example registers an event handler for the event ʺtreeNodeSelectedʺ that is fired from the tree frame. The event handler is registered in the parent JSP page to handle the event named treeNodeSelected when the event is fired from the tree frame. The registration sets onNodeSelected tohandle the event:<script>registerClientEventHandler("tree", "treeNodeSelected", onNodeSelected);function onNodeSelected(nodeId){ ... }</script><frameset cols="50%,50%"><frame name="tree" src="tree.jsp"><frame name="list" src="list.jsp"></frameset>

karthick

Hi,

Thanks for the reply.

My problem is the 3rd frame(component jsp page) does not know of when the event is going to be fired.Because it is not going to generate event.It contains only Text and Label Controls to display object properties.In my case 3rd party Applet invoke the servlet.So only the Servlet can generate event.

What i need to do is. invoke 3rd Frame(component) from Servlet(call 3rd Frame's behaviour class from Servlet),and then i need to reload the component jsp page.

My approach is call component onRender() method from servlet and then call setClientEvent() like,

onRenderEnd() {

.........

.............

setClientEvent("invokejsp",args);

}

Then,on the jsp page registerClientEventHandler(null, "invokejsp", reload) and call reload() javascript function to reload the page.But it is not working.

How to force the component to reload its jsp page from its Behavior Class.?

Thanks,

karthicks