Seam Conversational components and JSF component bindings

[ranjithk]

Hi,

I am stuck with using a JSF component binding with a Seam component. I came across the section Conversational components and JSF component bindings in the seam reference document.

Even though it mentions the work around I am not quite what to bind in the JSF page

If you have suggestions please let me know. Thanks in advance.

Regards,
Ranjith

[ranjithk]

I want to add onto my post. I tried the way seam document suggests i.e having a EVENT scoped Seam Grid component and a Conversation scoped seam gridEditor component but then seam throws the following error. Here sdmManager is equivalent gridEditor, sdmGrid is equivalent grid and grid refers to the actual HtmlPanelGrid

javax.el.PropertyNotFoundException: 
/html/add.xhtml @31,64 binding="#{sdmManager.sdmGrid.grid}" Target Unreachable, identifier 'sdmManager' resolved to null

[rmcdonough]

You sound like you're having a similar problem as I was. Christian followed up with a post that explains the problem here:

http://seamframework.org/Community/ConversationalScopeWithJavaBeans

Ryan-

[mail.micke]

Hi,
I went through the same a while ago.

For me it worked to @Out:ject the object I did the bindnig to.

- Micke

[ranjithk]

Thanks for your responses. I will try out the suggestions.

Ranjith

[ranjithk]

I am still not able to get it working. I am posting the code here so it might help in understanding how I am trying to use the workaround mentioned in the document. I tried to outject thesdmGrid as suggested by Micke but it did not help either

Binding in JSP page:
--------------------
<h:panelGrid columns="2" binding="#{sdmManager.sdmGrid.grid}">
</h:panelGrid>           

SDMManager - Conversation scope component:
-------------------------------------------
@Name("sdmManager")
@Scope(ScopeType.CONVERSATION)
public class SDMManager {

     @In(required=false) 
     private SDMGrid sdmGrid;

     public SDMGrid getSdmGrid(){
          sdmGrid = new SDMGrid();
         HtmlPanelGrid grid = new HtmlPanelGrid();
         sdmGrid.setGrid(grid);
         List<UIComponent> children = grid.getChildren();
         
         Collection<FieldFormatData> formats = dataManager.getFieldFormatData();
         for(FieldFormatData format:formats){
              HtmlOutputLabel outputLabel = new HtmlOutputLabel();
              outputLabel.setValue(format.getShortDesr());

              children.add(outputLabel);
         
              HtmlInputText inputText = new HtmlInputText();
              inputText.setSize(10);
              inputText.setMaxlength(10);
              System.out.println("Binding ................................... " + format.getEntityField());
              inputText.setValueBinding("value", FacesContext.getCurrentInstance().getApplication().createValueBinding("#{entity."+format.getEntityField()+"}"));

              children.add(inputText);
              
         }

}

SDMGrid - Event Scope component
----------------------------
@Name("sdmGrid")
@Scope(ScopeType.EVENT)
public class SDMGrid {
     private HtmlPanelGrid grid;

     public HtmlPanelGrid getGrid() {
          return grid;
     }

     public void setGrid(HtmlPanelGrid grid) {
          this.grid = grid;
     }     
     
}
    

Ranjith

[ranjithk]

Hi,

I am still looking for a solution for this problem. Would really appreciate any help on this. Thanks

Ranjith

[matt.drees]

Ranjith:

Binding in JSP page:
--------------------
<h:panelGrid columns="2" binding="#{sdmManager.sdmGrid.grid}">
</h:panelGrid>           

You're not really following what the Seam documentation is suggesting.  Your view should look more like this:

<h:panelGrid columns="2" binding="#{sdmGrid.grid}">
</h:panelGrid>           

And your manager should look more like this:

@Name("sdmManager")
@Scope(ScopeType.CONVERSATION)
public class SDMManager {

     @In(create=true) 
     private SDMGrid sdmGrid;

     public void populateGrid(){
          // do stuff to sdmGrid.getGrid, if empty
     }

}

You'd probably want to call populateGrid() in a page action.

[ranjithk]

I could get it working now. Thanks a lot Matt

Ranjith