EL Expressions

The default evaluator for EL expressions are derived from Apache Commons EL. Thus, its funcationality is the same as JSP 2.0’s EL expressions¹.

If you prefer a more powerful EL evaluator, such as MVEL, OGNL² or your own implementation, you could specify it with the evaluator directive. For example,

<?evaluator name="mvel"
    import="org.zkoss.zul.Datebox,org.zkoss.zul.Combobox"?>

<window id="w" title="MVEL Demo">
    You see a textbox appended with MVEL:
    ${new Datebox().setParent(w)}
    Another example:
    ${new org.zkoss.zul.Textbox().setParent(w)}
    Another:
    ${new Combobox().setParent(w)}
</window>

1. Notice that the package names are all changed, and the dependency of JSP EL is removed, so it is OK to run under any Web server without any conflict ↩

2. Both MVEL and OGNL are supported in ZK EE. ↩