What Is an Iterator?
Data access for attributes in a binding, as well as most operations and method bindings, requires iterators. You can think of an iterator as a current record pointer on a collection; for example, the expression #{bindings.EmployeeId.inputValue} actually evaluates to “the Employee Id of whatever record in EmployeesUpdateable1 collection is currently pointed to by the Employees Updateable 1 Iterator.” This link from EmployeeId to EmployeesUpdateable1Iterator is defined in the PageDef file.
In normal circumstances, a particular collection of records would maintain a single iterator to track the row currency (record marked as current) in the user interface. However, secondary iterators on the same collection are possible and ...
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