ZK Developer's Guide

Another area of application is the possibility of iterating over components, or
conditional evaluation. For that zk elements supports the following attributes:
•
•
•
forEach
if
unless
A small example of usage is as follows:
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Chapter 1
The zscript element is used for embedding Java code into ZUML pages. At the
time of page evaluation the code will be interpreted by the BeanShell (http://www.
beanshell.org). It's possible to embed Java code directly between the opening
and closing zscript tags. Another way is to use the src attribute of the zscript
element. In this attribute, you could specify a URI to a file, which contains the Java
code. The zscript element supports conditional evaluation with the help of the if
and unless attributes.
Beyond zscript you could use EL (Expression Language) Expressions in
your ZK pages.
The attribute element defines an attribute of the enclosing element. We have used
this ZK Element in the "Hello World" example.
...
One area of application is event listeners. The attribute element supports
conditional evaluation with if and unless, too.
The custom-attributes element is used to define an object in a special scope (for
example, page scope).