Welcome to Software Development on Codidact!
Will you help us build our independent community of developers helping developers? We're small and trying to grow. We welcome questions about all aspects of software development, from design to code to QA and more. Got questions? Got answers? Got code you'd like someone to review? Please join us.
Clear selectManyMenu component if user unselects item in JSF 2
I am working with JSF 2.3 and have a selectManyMenu component that is marked as required but that I want to be cleared if the user unselects all items. Currently, the user can unselect all items, but the backing bean will still have the last selected item retained. This causes the UI to not reflect what will actually get stored in the database.
How can I get the UI to reflect that the user has deselected all items without removing the required attribute?
1 answer
You can do that by letting the required attribute evaluate true only when the form's main submit button is invoked.
First bind the submit button component to an unique variable in page's EL scope (and thus not necessarily to a bean property!):
<h:commandButton ... binding="#{submit}" />
Then let the input component's required attribute check if the request parameter associated with the submit button component is present in the request parameter map:
<h:selectManyMenu ... required="#{not empty param[submit.clientId]}">
0 comment threads
0 comment threads