2 Replies Latest reply on Oct 11, 2012 1:30 AM by christian.yttesen

CommandLink howto use "runtime" value for action/actionListener

christian.yttesen Oct 10, 2012 7:03 AM

Hi,

Using RichFaces 3.3.3 GA.

I have dataTable component which is currently being constructed server-side using the binding attribute. My goal is to get rid of this server-side construction but I face problems when it comes to my command link.

I have a list of MessageAction value objects, defined as

public class MessageAction {
  protected String cssIcon;
  protected String label;
  protected String link;
  protected MethodExpression action;
  protected MethodExpressionActionListener actionListener;
}

My component binding code iterate those and constructs instances of the CommandLink object and sets the action/actionListener attributes, like:

AjaxCommandLink link = new AjaxCommandLink();
link.setValue(JsfUtils.getResource(action.getLink()));
link.setImmediate(true);
if (action.getActionListener() != null) {
  link.addActionListener(action.getActionListener());
}
if (action.getAction() != null) {
  link.setActionExpression(action.getAction());
}

So I need help as to how I can use the runtime value of messageAction.action and messageAction.actionListener when the dataTable is generated in my JSF page.

<rich:dataTable value="#{messageActionBean.messageActions}" var="item">
  ...
  <rich:column>
    <a4j:commandLink value="#{msgs[item.link]}" immediate="true" actionListener="#{item.actionListener}" action="#{item.action}" />
  </rich:column>
</rich:dataTable>

The effect of above is not the runtime evaluated #{item.actionListener}.

I'm very open to other ways of doing this - I just want to move away from the component binding as the table is getting more complex and its much easier to maintain in JSF page.

If I create a binding on the commandLink I somehow need access to the "current" messageAction being iterated - can this be accomplished somehow?.

Thanks.

Regards,

Christian

1. Re: CommandLink howto use "runtime" value for action/actionListener

christian.yttesen Oct 10, 2012 8:07 AM (in response to christian.yttesen)

If I create a binding on the commandLink I somehow need access to the "current" messageAction being iterated - can this be accomplished somehow?.

Tried out a component binding on the commandLink:
<a4j:commandLink binding="#{messageActionBean.actionLink}" />

Added logic in the binding get-method that construct the link + action/actionListener. Current row (MessageAction) was simply obtained by finding the dataTable component (enumerating parents) and invoke the dataTable.getRowData() to get the current row.

public HtmlCommandLink getActionLink() {
    MessageAction curr = getCurrentMessageAction(actionLink);
    if (actionLink != null && curr != null) {
      actionLink.setValue(JsfUtils.getResource(curr.getLink()));
      actionLink.setImmediate(true);
      if (curr.getActionListener() != null) {
        actionLink.addActionListener(curr.getActionListener());
      }
      if (curr.getAction() != null) {
        actionLink.setActionExpression(curr.getAction());
      }
    }
    return actionLink;
}

Seems not to work either - the link is not displayed at all :-(. Might be me not fully understanding component bindings.

Regards,
Christian
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2. Re: CommandLink howto use "runtime" value for action/actionListener

christian.yttesen Oct 11, 2012 1:30 AM (in response to christian.yttesen)

Found a solution that works for me. Essentially I assign the action and actionListener to the MessageActionBean that holds the list of MessageActions - inside these methods I simply "forward" the calls.

JSF:
<h:commandLink value="#{msgs[item.link]}" actionListener="#{messageActionBean.actionListener}" action="#{messageActionBean.action}" immediate="true">
          <f:attribute name="current" value="#{item}" />
          <f:setPropertyActionListener value="#{item}" target="#{messageActionBean.current}" />
</h:commandLink>

ManagedBean:
public String action() {
return (String) current.getAction().invoke(FacesContext.getCurrentInstance().getELContext(), null);
}

public void actionListener(ActionEvent evt) {
          current = (MessageAction) evt.getComponent().getAttributes().get("current");
          current.getActionListener().processAction(evt);
}

Still interessed in hearing about other possible solutions.

Regards,
Christian
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