More EL Examples

From Documentation
Revision as of 10:36, 19 January 2022 by Hawk (talk | contribs) (correct highlight (via JWB))
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)

Stop.png This documentation is for an older version of ZK. For the latest one, please click here.

${empty myMap}

Tip: empty is an operator used to test whether a map, a collection, an array or a string is null or empty.

Tip: myMap[entry] is a way to access an element of a map. In other words, it is the same as myMap.get(entry) in Java.

When an EL expression is used as an attribute value, it could return any kind of objects as long as the component accepts it. For example, the following expression will be evaluated to a Boolean object.

<window if="${some > 10}">

Standard implicit objects, such as param and requestScope, and ZK implicit objects, such as self and page, are supported to simplify the use.

<textbox value="${param.who} does ${param.what}"/>

Last Update : 2022/01/19

Copyright © Potix Corporation. This article is licensed under GNU Free Documentation License.