Your concrete problem is caused by 2 facts: When JSF needs to decode a form submit action or a submitted input value, then it also checks if the component is rendered or not (as safeguard against hacked/tampered requests). Request scoped beans are recreated on every HTTP request (an ajax request counts also as one request!). … Read more
The right JSF component to represent a HTML <div> element is the <h:panelGroup> with the layout attribute set to block. So, this should do: <h:panelGroup layout=”block” … rendered=”#{someCondition}”> … </h:panelGroup> Alternatively, wrap it in an <ui:fragment>: <ui:fragment rendered=”#{someCondition}”> <div> … </div> </ui:fragment> Or when you’re already on JSF 2.2+, make it a passthrough element: <div … Read more
JSTL tags are evaluated during building of the view, not during rendering of the view. You can visualize it as follows: Whenever a view tree get created for the first time, all JSTL tags are executed and the result is a view with only JSF components. Whenever a view tree get rendered, all JSF components … Read more
Yes, use the rendered attribute. <h:form rendered=”#{some boolean condition}”> You usually tie it to the model rather than letting the model grab the component and manipulate it. E.g. <h:form rendered=”#{bean.booleanValue}” /> <h:form rendered=”#{bean.intValue gt 10}” /> <h:form rendered=”#{bean.objectValue eq null}” /> <h:form rendered=”#{bean.stringValue ne ‘someValue’}” /> <h:form rendered=”#{not empty bean.collectionValue}” /> <h:form rendered=”#{not bean.booleanValue and … Read more
Ajax updating is performed by JavaScript language in the client side. All which JavaScript has access to is the HTML DOM tree. If JSF does not render any component to the HTML output, then there’s nothing in the HTML DOM tree which can be obtained by JavaScript upon Ajax update. JavaScript cannot get the desired … Read more
It’s not possible to re-render (update) a component by ajax if the component itself is not rendered in first place. The component must be always rendered before ajax can re-render it. Ajax is using JavaScript document.getElementById() to find the component which needs to be updated. But if JSF hasn’t rendered the component in first place, … Read more