Integrating Custom Iteration Actions
JSTL offers two utilities for customized iterations: a support class that can be extended for application-specific iteration actions and interfaces that actions nested in the body of an iteration action can use to get information about the iteration status.
Implementing a Custom Iteration Action
action is so flexible that
it probably covers most cases, but to help develop
application-specific iteration actions when needed, JSTL provides a
base class for this as well. It’s named
public abstract class LoopTagSupport extends javax.servlet.jsp.tagext.TagSupport implements javax.servlet.jsp.jstl.core.LoopTag, javax.servlet.jsp.tagext.IterationTag, javax.servlet.jsp.tagext.TryCatchFinally
The class has the following fields a subclass can access:
protected int begin protected int end protected int step protected String itemId protected String statusId protected boolean beginSpecified protected boolean endSpecified protected boolean stepSpecified
These variables hold the value of the corresponding attributes. The
variable names for the
varStatus attributes (
statusId) are, unfortunately, not in sync with
the attribute names, due to an oversight when the attribute naming
conventions where changed. Nobody’s perfect. For the
int variables, there are also
boolean variables that tell if the corresponding
attributes where set or not.
Here are the main methods a subclass must ...