I have been trying to render a rich:dataTable, but fails, when it comes to its conditional rendering.I wanted to render it only if the size of the list, the backing-bean fetches from DB, is greater than zero.
JSF-2.0, RichFaces-4 are what i use.
3 Answers
1
votes
You have to use the "render" attribute of the datatable. With it you can define if the component is rendered to the client or not. So check by EL if the list is populated.
you can do something like:
rendered="#{not empty listObject}"
and all is fine. I always implement my database query method to never return null, if the query has no result I return an empty list. This way i'm sure I never get a nullpointerexception and I prefer then to show an empty table. Because it's easer to layout the page, when you are sure the table always exist.
Hope that helps.
0
votes
The scenario is I have a groupId which I rightclick on. On the context menu, I choose Display CTNs and it should then render all the CTNs of this group in a data-table. It starts with a JavaScript call, which I call once I choose "Display CTNs". It takes care of supplying the GroupId to the a4j:jsFunction.
<rich:dataTable value="#{ctnGrpMgmtController.ctnDetailsList}"
var="ctnVar" id="ctnTable" rows="5"
rendered="#{not empty ctnDetailsList}">
The above should be rendered after the below a4j:jsFunction executes.
<a4j:jsFunction name="selectGroupForManagingCtns"
action="#{ctnGrpMgmtController.loadCTNsForAGroup}"
render="ctnListPanel,ctnTable">
<a4j:param name="name"
assignTo="#{ctnGrpMgmtController.groupId}" />
</a4j:jsFunction>
I have to do an F5 to see the component "ctnTable", which is where the problem starts.
