declare multiple variable resolver in a zul

answered 2021-03-05 13:04:44 +0800

jeanher
1824 ● 2 ● 6

https://www.zkoss.org/wiki/ZUMLReference/ZUML/ProcessingInstructions/variable-resolver

"You can specify multiple variable resolvers with multiple variable-resolver directives..."

answered 2021-03-10 11:26:12 +0800

cor3000
6280 ● 2 ● 7

updated 2021-03-10 11:27:19 +0800

How does zk know which one to use ? Does it attempt them one by one ?

yes it goes through the list of all variable resolvers. The first one returning the first non-null value.

You can add a breakpoint in PageImpl#getXelVariable to see what resolvers are defined at page level - and in which order they are processed.

There can be additional VariableResolvers not defined a page level that also take part in the variable resolution.

Also is it possible to explicitly state the resolver to use in a zul page for a particular component ?

In a page you define a specific VariableResolver for the whole page (not per component).

Still you can add custom attributes for a specific component. There will be a built-in variable resolver also looking into the component scoped variables. Or you can split your zul code into multiple files having different variable-resolvers configured.

In the end it might just be that variable resolver isn't the perfect tool for your requirements/goals you're trying to achieve. In case you can give some details about those there is maybe a different way to implement those (e.g. the mentioned custom-attributes).