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MVVM Binding Properties of Child object - No change notification?

asked 2016-09-15 13:11:18 +0800

FlorianSchaetz gravatar image FlorianSchaetz flag of Germany
31 6

updated 2016-09-15 13:11:47 +0800

Let's assume a simple zul...

<div width="100%" height="100%" viewModel="@id('vm') @init('com.example.MyVM')">
  <div visible="@load(vm.child.isElementVisible)"/>
  <div visible="@load(not vm.child.isElementVisible)"/>
  <button onClick="@command('doSomething')"/>
</div>

Now I've got a simple comand in the VM...

@Command
@NotifyChanges({"child.elementVisible", "someotherproperty"})
public void doSomething() {
  this.child.setElementVisible( !this.child.isElementVisible() );
}

Unfortunately, this doesn't work at all. The visibilty doesn't change. As the initial value of the visibility works fine, it seems that only the change notification doesn't seem to work.

But if I add a delegate method to the vm itself...

public boolean isElementVisible() {
   return this.child.isElementVisible();
}

...and use that in my zul...

  <div visible="@load(vm.isElementVisible)"/>
  <div visible="@load(not vm.isElementVisible)"/>

...it works perfectly fine. Has anyone an idea why the notification here fails?

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3 Answers

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answered 2016-09-15 13:24:04 +0800

FlorianSchaetz gravatar image FlorianSchaetz flag of Germany
31 6

Ah, it seems that @NotifyChange does not support child properties like...

@NotifyChanges({"child.elementVisible", "someotherproperty"})

Instead we have to use something like this...

BindUtils.postNotifyChange(null, null, child, "elementVisible");

...which does seem to work. And we have to hope for the other thing as a new feature ;-)

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answered 2016-09-16 07:58:54 +0800

Darksu gravatar image Darksu
1991 1 4

Hello,

There is always the option @NotifyChange("*") but this will update everything.

Best Regards,

Darksu

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answered 2016-09-30 15:07:49 +0800

SoumiaOulkasse gravatar image SoumiaOulkasse
3 1

Hello,

I think @NotifyChanges does not support this (child.elementVisible) , instead you should do this : @NotifyChanges({"child", "someotherproperty"})

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Asked: 2016-09-15 13:11:18 +0800

Seen: 40 times

Last updated: Sep 30 '16

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