JSF 2 - How can I perform an action after a Composite Component child completes an operation?
Question
I'm still learning to use some of the capabilities of Composite Components in JSF 2. I am experienced with JSF 1.2 development and I have recently read the book "Core Java Server Faces 3rd Edition" by Geary and Horstmann.
What I'm trying to do is create a Composite Component that wraps a file upload component (currently using the PrimeFaces <p:fileUpload> ). I need to associate the uploaded file with a string-based key on a session-scoped managed bean (to be used later). I am trying to provide the key via an attribute on my Composite Component interface named 'uploadedFileKey'. Here is the interface:
<html xmlns:composite="http://java.sun.com/jsf/composite">
<composite:interface>
<composite:attribute name="uploadedFileKey"
type="java.lang.String"
required="true" />
</composite:interface>
...
</html>
The implementation is straightforward and uses the PrimeFaces fileUpload tag as I mentioned earlier. It requires a managed bean with an event handler which I also created based on the sample code from the PrimeFaces showcase webapp. Here is my implementation:
<composite:implementation>
<p:fileUpload
fileUploadListener="#{primeFacesFileUploadController.handler}"
label="Browse"
mode="advanced"
allowTypes="png,gif,jpg" />
</composite:implementation>
I'm not going to include the entire controller bean here, but here is the class declaration:
@ManagedBean(name="primeFacesFileUploadController")
@RequestScoped
public class PrimeFacesFileUploadController {
// ...
}
The PrimeFaces file upload is not unlike others that I have seen. It uses a custom Filter on the Faces Servlet to get access to the uploading data. The actual file upload part works fine and when the upload is successful I have the uploaded file stored in a temp file on my Tomcat server.
My problem is not knowing how to make my Composite Component take an action after a successful upload. I want my Composite Component to store the uploadedFileKey in a Map on a particular session-scoped managed bean with the uploaded File as the map value. How can I do that?
1 answers
solution1
1 ACCPTED 2011-06-06 19:47:41
I'd just pass the key along as a custom component attribute by <f:attribute> and let the handler handle it. You can get it in the handler method by event.getComponent().getAttributes() .
Eg
<composite:implementation>
<p:fileUpload
fileUploadListener="#{primeFacesFileUploadController.handler}"
label="Browse"
mode="advanced"
allowTypes="png,gif,jpg">
<f:attribute name="key" value="#{cc.attrs.uploadedFileKey}" />
</p:fileUpload>
</composite:implementation>
with
public void handler(FileUploadEvent event) {
String key = (String) event.getComponent().getAttributes().get("key");
yourSessionBean.getMap().put(key, event.getFile());
}
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