org.zkoss.zk.ui.processMask.enabled
From Documentation
Property:
org.zkoss.zk.ui.processMask.enabled
Applicable: globally in zk.xml via <library-property> not as <custom-attribute>
Default: false
Since since 6.5.5
Specifies whether to always enable the process mask when doing a long operation at the server-side. The mask will cover the whole page to prevent users interacting with UI like: