Question

I use a managed bean to generate an HtmlPanelGrid, and then bind it in the xhtml file, like so

    <h:panelGrid id ="questions"  binding="#{ui.generatedComponents}" />

On this page is a form, with a dropdown, and whenever a value is selected, it shows the page. However, whe something is selected, every other (static i.e in xhtml page) component is shown, but the binded component is never shown.

However, if I re-request the page in the browser, it does show them.

Mucho confusing. Any ideas?

Answer 1

When using binding, you need to make absolutely sure that the property behind this attribute is exclusively been used by this component in the current view. The managed bean should not be in the session scope, because it would then share the same property between multiple views (browser windows/tabs) in the same session. It should of course also not be in the application scope. The managed bean should be at highest in request or view scope. The view scope makes the most sense for this particular purpose.

The getter method of the property behind binding should also contain no business code. It should solely return the property, nothing more. Any initialization needs to be done in the (post)constructor or an (action)listener method of the backing bean class. Any manipulation of this component property needs to be done in an (action)listener method of the backing bean class.

Not doing so may result in awkward behaviour.