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How to do a Synchronous call to custom widgets java backend [message #1115422]

Tue, 24 September 2013 05:11

Christian Hager

Messages: 53
Registered: July 2009
Location: Germany

Member

Hi,

I'm currently developing a custom widget and I was wondering how I could implement a synchronous call to the java backend. I'm trying to implement a lazy loading method which is triggered by the JS widget itself. I thought about using remoteObject's call method but I fail to see how I can get the newly loaded data back to the client-side.

Could anyone here please give me any hints on how to do this?

Thanks in advance for any hints or help.

Christian

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Re: How to do a Synchronous call to custom widgets java backend [message #1115530 is a reply to message #1115422]

Tue, 24 September 2013 08:12

Tim Buschtoens

Messages: 396
Registered: July 2009

Senior Member

Hi.

Synchronous calls are intentionally not possible with the RAP JavaScript
API. If I understand your usecase correctly, you will have to use a
callback pattern, e.g.:

client:
remoteObject.call( "sendMeData" );

server: (in OperatinoHandler.handleCall )
remoteObject.call( "sendMeDataCallback", mapWithDataObject );

If you need to need to specify which data to load you can add an
argument to the client->server call and loop it back to the
server->client call (in addition to the actual data).

Does that solve your problem?

Greetings,
Tim

Am 24.09.2013 07:11, schrieb Christian Hager:
> Hi,
>
> I'm currently developing a custom widget and I was wondering how I could
> implement a synchronous call to the java backend. I'm trying to
> implement a lazy loading method which is triggered by the JS widget
> itself. I thought about using remoteObject's call method but I fail to
> see how I can get the newly loaded data back to the client-side.
>
> Could anyone here please give me any hints on how to do this?
>
>
> Thanks in advance for any hints or help.
>
>
> Christian

--
Tim Buschtöns

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