Hi, I'm having problems displaying listBox only if certain condition is accomplished.
My classes: editData.zul editDataVM.java
-I have a Integer on editDataVM -> private Integer modelNumber; -modelNumber can be 0 or 1. -I want listbox to be displayed if modelNumber is 1
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<listbox if="@load(vm.modelNumber) == 1">
but it's always displaying. How can I do this
The documentation for the special if attribute shows that it requires an EL expression and not a @load binding annotation
That's why your usage has no effect. The if attribute is NOT a component propery, and hence no property binding will have an effect. It's an instruction for the ZUL parser/evaluator to include a component in a page or not at all.
<listbox if="@load(vm.modelNumber == 1)">
If you want to evaluate the listbox once statically you can use an EL-expression:
<listbox if="${vm.modelNumber == 1}">
For a dynamic usage ZK (EE) provides the shadow-<if> element.
<if test="load(vm.modelNumber == 1)">
<listbox ...>
</if>
In ZK CE you can use the uglier "single-children-binding" (as I call this). This will evaluate the template if the @load binding result is non null.
<div children="@load(vm.modelNumber == 1 ? 'dummy' : null)">
<template name="children">
<listbox ...>
</template>
</div>
Hi, thanks a lot for this complete explaination. So, if modelNumber changes to null on my VM, will this change affect the DIV in real time like AJAX or will I have to make other changes?
daniapesteguia ( 2021-11-08 22:48:19 +0800 )editAsked: 2021-10-20 05:27:41 +0800
Seen: 9 times
Last updated: Oct 20 '21