How to handle events in ZK Webui properly

[Jan Thielemann]

Hi,

what i want to do is the following:

I have a custom subclass of WEditor which consists of a textfield and a button. If the button is pressed, i initiate a call via our asterisk telephone system. I don't want to block the ui so i initiate the call via a worker class (subclass of java.lang.Thread) which calls my editor once it has initiated the call. Now i want to change the button image so the user can see that the call is initiated. If he click the button again, i want to end the call. I already did this in the swing client and it works great but in the webui several errors occured to me.

The first error is that if i try to change the button image from the method which gets called by my worker, i get a java.lang.IllegalStateException: Components can be accessed only in event listeners. This is what actually worked in the swing client...

So i tried to post an event but every event i post programmatically causes a NullPointerException because Events.postEvent() makes use of Execution exec = Executions.getCurrent(); when posting events and this is null because my worker is running in another thread.

The next thing i tried is to save the current executions to an instance variable and post my event there but my event never shows up in the editors onEvent() method.

Even if i try to post an event before is start my worker, the event does not show up in my event listener.

I would really like to learn what i am doing wrong and how to solve my problem. Every hint into the right direction is appreciated!

[Heng Sin Low]

you need to use server push if you want to update zk component in worker thread ( use the serverpushtemplate class ).

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[Jan Thielemann]

Hello hengsin,
thank you for the answert. I'll take a look at the serverpushtemplate. I also found another way which works for my special case:

In my WEditor subclass, i add "onMySpecialEvent" to the EVENT_LISTENERS array. Then i can call:

Executions.schedule(AEnv.getDesktop(), this, new Event("onMySpecialEvent"));

from the method which gets called by my worker thread.
 

[Heng Sin Low]

Internally, the SeverPushTemplate is also using Executions.schedule so it is actually the same approach here.

 

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