This post is based on sample application I have developed - UndoCreate.zip. Sample is based on standard HR schema, before running application make sure you have correct DB connection defined.
1) Find Functionality
By default, when you are using ADF Search Form functionality, entered query parameters are stored and are shown again when user will re-open form in Find mode. However, based on my experience, usually it is not a desired behavior. Users prefer not to see old query parameters when they re-open form in Find mode. For example, when some query parameter is entered:
Search is executed and result returned:
And now, when user will press Find button again, previous query criteria should be cleared. It is not cleared by default in ADF, however it is cleared in my sample application:
I'm clearing previous query parameters by executing combination of Rollback, Find, Delete and Create actions in backing bean findButton_action() method associated with Find button.
2) Find Functionality - No Results
When user enters query parameter, that will not give any result, and press Search button - empty form will be returned by default. Example of non-existing query criteria:
Empty form returned by default:
In my sample application, I have changed this default behavior in executeButton_action() method in backing bean. I'm doing a check - if iterator is empty, I'm returning to Find mode and displaying information message - 'No Results found!':
In this case I'm not clearing entered query criteria.
3) Undo Functionality in Create Mode
When form is in Create mode, user usually prefer to have 3 choices - to store entered data and to go to Edit mode, to clear entered data and to remain in Create mode, and to close Create mode by opening form in Find mode:
If with 2 cases - to store entered data or to open form in Find mode everything is less or more okej, there is a problem with a case when user wants to clear entered data and to remain in Create mode. With default Undo functionality, when using only Rollback action, user will be navigated back to Edit mode. In order to change this, I'm re-invoking Create mode initialization from backing bean in undoButton_action() method, it is invoked after default Rollback action. This allows to clear entered data and to stay in Create mode after Undo button is pressed:
4) Undo Functionality in Edit Mode
By default, when Undo button is pressed while in Edit mode and Rollback action is executed, changes will be discarded and at the same time form will be refreshed and will show first row from iterator. This means, user will be navigate from a row he is currently editing to a first row in iterator.
To make this behavior more user friendly, I have implemented custom Rollback functionality in undoButton_action() method in backing bean:
In this code, I'm acquiring form related iterator, getting current row user is editing and refreshing it. At the end, I'm applying Partial refresh to a form in order to display correct data. More information about Rollback functionality you can find in Chris Muir blog post - JDeveloper and the art of the rollback. The same functionality can be applied not only in 11g, but in 10g as well.
With implemented functionality, if user is editing data:
And decides to remove all changes by pressing Undo button, form will remain on the same row:
5) Delete Functionality
When user executes Delete functionality, I can recommend to commit transaction at the same time. In developed sample application, when Delete button is pressed - deleteButton_action() method is invoked, where confirmation popup is opened:
When user confirms Delete action, Commit action is executed at the same time, and row is removed from database.
6) Delete Functionality - Last Row
By default, after user will delete last row from iterator, empty form will be rendered:
Such behavior is not user friendly, much better to navigate to Find mode automatically:
This logic is implemented in deleteDialogListener(DialogEvent dialogEvent) method in backing bean:
7) Confirm or Undo Pending Changes
When user is editing data and there are pending changes (before commit or rollback), based on my experience its better not allow to navigate from current row. For example, when data is changed and there are pending changes:
Buttons related to form logic - Find, Create, Delete and buttons related to form navigation - First, Previous, Next and Delete are blocked. Information message is shown - 'Save or Undo Changes First!' asking user to confirm or dismiss current pending changes:
Information about pending changes is retrieved from bindings.Commit.enabled using Expression Language. Its enough to edit data available in the form and bindings.Commit.enabled will return true.
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