The Presentation API includes several methods that you can use for paging.
The
ENEQuery object is the initial access point for
providing the paging controls for the entire record set. By default, the
navigation query returns a maximum of ten records to the
Navigation object for display. To override this
setting, use:
The default offset for a record set is zero, meaning that the first ten records are displayed. The default offset can be overridden in one of two ways:
To find out the offset used in the current navigation state, use the
ENEQuery.getNavERecsOffset() method (Java) or the
ENEQuery.NavERecsOffset property (.NET). By adding one
to the offset parameter, the application can calculate the number of the first
record on display.
To ascertain the total number of records being returned by the
navigation query, use the
Navigation.getTotalNumERecs() method (Java) or the
Navigation.TotalNumERecs property. If the number of
records returned is less than the number of records returned by the
ENEQuery.setNavNumERecs() method (Java) or the
ENEQuery.NavNumERecs property (.NET), then no paging
controls are needed.
The following table provides guidance about the paging logic necessary in your Web application to calculate the previous, next, and last pages.
|
|< First |
< Previous |
> Next |
>| Last |
|---|---|---|---|
|
set No = 0 |
offset - navNum |
offset + navNum |
totNum - remainder (if remainder < 0) totNum - navNum (if remainder = 0) |
where:
Note
When using paging controls, consider how paging should interact with other aspects of the application. For example, if the user is paging through the record set and then decides to sort on a property, should the No parameter be reset? The answer depends on the desired functionality of the application.
