Relationship through SelectManyCheckbox

Question

Hi:
I am trying to implement a relation for a User than can have several Roles, through a UserRole table that implements the relationship
The idea is present an interface that displays several checkboxes representing the Roles, so the administrator can give a single user the number of roles he needs. I assume that this can be acomplished using SelectManyCheckbox control, so, for each checkbox selected, a new UserRole registry is added.
How can i do this using ADF ??? Is there any example available ???
Honestly, the examples provided in the Jdev official site, are too much simple for a real world application, wich is very annoying
Thanks

Answer 1

Hi,
I just finished implementing a function exactly the same as you want.
Here is what I did
in backing bean (the most important part)
1) declare variables to support the selection and of course add the accessor method for the first two variables
private String[] selectedItems; to store list of selected roles
private List items; to store master role list that is available
private int maxSelectedItems = 0; to store total of role available
2) initialize items with full role list in your bean
setItems(new ArrayList());
for each of your master role list record (I retrieved this via a view object from database)
getItems().add(new SelectItem(yourRoleID, yourRoleName));
maxSelectedItems = total number of your master role list
setSelectedItems(new String[maxSelectedItems]); (if you don't do this, you will hit IndexOutBound exception)
optional: if you need to pre-check some roles (e.g. in case of editing an existing user record), then you need to
for (int i=0; i<noOfpreCheckedBox; i++) {
selectedItems = what ever your Role is
3) saveButton method
noOfItemSelected = getSelectedItems().length;
for (int i=0; i<noOfItemSelected; i++) {
create a new row in your target view object
set role id attribute to selecteditems[i]
set user id to whatever user id is
Of course, for existing user record it is more complicated.
You may need to compare whether the role exists in database or not (I check it from a view object). create row only if it does not exist.
You also need to check whether a role shown in your user's role view object exists in your selecteditems list. if not, it means user has unchecked it, then you need to delete it from the view.
Finally, do a commit. I pre-created an action binding in my PageDef for this, so I can simply call getOperationBinding("Commit").execute()
in jsp
<af:selectManyCheckbox label="Assign user to Role(s)"
requiredMessageDetail="You must select at least one role"
value="#{backingbean.selectedItems}"
required="true">
<f:selectItems value="#{backingbean.items}"/>
</af:selectManyCheckbox>
Hope this help.