Menu change fails to refresh page content

Question

Consider a fruit menu and a set of nutritional input boxes . When a different fruit is selected the details should change.
The menu is a dropdown list and the details are text inputs. The menu is auto-submit and it has an event handler for value-change.
The menu value and all of the inputs are bound to properties in a single data model. The data model lives in a managed session bean. When the menu value changes the data model is replaced by calling the session bean and passing it the new name.
All of that works but the none of the details change on the page except the name of the fruit. The name input box is bound to the same field the menu value is bound to. The other input boxes are bound to the other data model fields.
Is there some step I am missing to implement this sort of dynamic update functionality?
TIA

Answer 1

I found the problem but not the solution.
The form contains Apple details and you select Orange from the menu. That triggers a submit. Once my value-change event is fired it loads the Orange data model. Therein lies the problem: the data model will subsequently be updated with the incoming Apple details.
The solution would be to have my value-change event hander called AFTER the model update but before the render response because the response has to be populated with the new details. I will give that a try but not sure how that's done.