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mbarr avatar image
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Using JET API's publish and subscribe methods to communicate between two windows in the same app

I have an application that opens to a main window: Window 1. If you click a button in the app, a new window will open: Window 2.

From what I can tell, Window 1 and Window 2 do not share a JET component. E.g., if I store something in JET Archive in Window 1, then open Window 2, Window 2 won't be able to grab the item from JET Archive, because it has its own, empty JET Archive.

I would like to be able to communicate between the two windows. E.g., if I click on a button in Window 2, I want Window 1 to do something in response.

I know I can use JET Context Change to update linked Eikon windows by registering a RIC change. But is there a way to use publish and subscribe to communicate between Window 2 and Window 1?

Right now, I've got this code linked to a button in Window 2:

JET.publish('test', 'Test publish message');

And this code in Window 1:

JET.subscribe("test", this._publishCallBack);  

_publishCallBack: function(){
  console.debug("inside publishCallBack, arguments = ", arguments);
 }

But when I press the button in Window 2, nothing happens in the console in Window 1.

Have I set this up wrong? Or is what I have in mind just not possible?

Thanks for any help you can provide!

eikoneikon-app-studiojet
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3 Answers

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Panit Wechasil avatar image
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This is the standard app dialog.


pub-sub.png (81.6 KiB)
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mbarr avatar image mbarr

Yeah, I never see the "From Channel" messages in the subscriber window. Even after I click Run and wait 3+ seconds.

Panit Wechasil avatar image Panit Wechasil

Can you try to put cpurl://apps.cp./apps/jetplayground in the main search box? You seems to be running it from the 3rd party container. If it's working in the standard window (popup from entering the url from the seach box), it means this API is limited to only TR applications.

mbarr avatar image mbarr

Ah! Yes, it is working when I run it out of the main search box, but not out of the Dev one. Does this mean our 3rd party app won't be able to use Publish/Subscribe? Or just I won't be able to test it in the Dev environment?

Panit Wechasil avatar image Panit Wechasil

I'll ask the owner of 3rd party container to confirm on this thread on Monday. It's likely to me that this API is limited to only TR app.

mbarr avatar image mbarr Panit Wechasil

Just wanted to make sure that the pub-sub API is limited to only the TR app. If not, would love to be able to make use of it in our app.

mbarr avatar image mbarr Panit Wechasil

Any word on whether pub-sub is usable outside the TR app?

Panit Wechasil avatar image Panit Wechasil mbarr

Sorry for delay response. I've just got the confirmation from the container team that only localhost or whitelisted urls are allowed. So that means the url you're using is not whitelisted. If you let me know the url, I can do the checking.

mbarr avatar image mbarr

Great! Appreciate all your efforts on this and the quick, thorough replies. Have a good weekend!

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Panit Wechasil avatar image
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Hi @mbarr, can you try this code that I have? 

	JET.subscribe("/jetplayground", function(message, channel) {
		console.log("From Channel: '"+channel+"' Data: "+message);
	});

	JET.publish("/jetplayground", "From PUB app");

Above code is working on my side.

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mbarr avatar image mbarr

Hi Panit.

I copied your code exactly, but it still is not working.

When you say it is working on your side, are you running the first line in window 1 of an app and then second line in window 2 generated from window 1?

Panit Wechasil avatar image Panit Wechasil

They are in the separate window but should also working on the same window as well. The next thing to check is what's the URL you're running this page. Is it localhost? This API is only working with localhost or white-listed domain.

mbarr avatar image mbarr

I am running this on what should be white-listed urls. The app is otherwise able to use JET API just fine, and the app has been on the TR/Eikon store for months now.

Panit Wechasil avatar image Panit Wechasil

Can you try the same code in localhost? There's also a JET test page at cpurl://apps.cp./apps/jetplayground

You can try this API in the app, choose Publish/Subsribe sample from the catalog. If it's working in jetplayground but not working on yours, I'm quite sure that it's blocked by the URL.

mbarr avatar image mbarr

When i run the Publish/Subscribe sample, I have two windows, but the message from the pub app is not showing up in the sub app. It's behaving just like what I was trying in my app. The published message is not getting picked up by the subscriber. Could the exact version of JET API be a factor?

Panit Wechasil avatar image Panit Wechasil mbarr

Did you click "Run" at the subscribe window as well?

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mbarr avatar image
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image.png

Here is an image from when I run the Publish/Subscribe sample. Should I be seeing something?


image.png (35.7 KiB)
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Panit Wechasil avatar image Panit Wechasil

Can you try to put cpurl://apps.cp./apps/jetplayground in the main search box? You seems to be running it from the 3rd party container. If it's working in the standard window (popup from entering the url from the seach box), it means this API is limited to only TR applications.

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