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Pub-Sub in Canvas App - refresh page based on an event

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Posted on by Thmit

Can the PowerApp receive a notification from a web service (called from an API) and refresh a specific page based on the information received)?

There are multiple ways in theory, but which ones are supported by Powerapps? Polling? Webhhoook? Websocket? MQTT? Make a new custom component with PCF?

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Power Apps Pro Dev & ISV

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nmk 193 on at

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Which backend system you are talking about? Is it dataverse or any other system. What is that backend system support if that's not a dataverse.

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Thmit 18 on at

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Hi nmk,
Not Dataverse. It comes froma web service (called from an API)

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nmk 193 on at

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So in this case, is this not dependent on what the other systems will provide you. You just need to consume it in the canvas app. I am really not sure if it's possible coz you need to use javascript in order to consume it and the only thing that comes to mind is to use PCF for canvas app.

Please give it a try.

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Thmit 18 on at

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Thank you, nmk.
Can we use custom connector on this?
I notice that we cannot access the Trigger request on CanvasApp, but we can use the Trigger in PowerAutomate.

Furthermore, is there a roadmap regarding this ?
Thanks!

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nmk 193 on at

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Yes, PCF for canvas apps is available. I haven't tried that out yet and it's still in preview.

More from the docs site:
https://docs.microsoft.com/en-us/power-platform-release-plan/2019wave2/microsoft-powerapps/component-framework-canvas-apps

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Thmit 18 on at

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I meant CustomConnector not CustomComponent.

We can create CustomConnector(from a certain RESTAPI) and specify the trigger as a webhook.
However, it is not possible to access this Webhook Trigger in CanvasApp.
Any thought?

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FlorianGrimm 21 on at

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You can use a websocket e.g. SignalR.
What I don't know is how you authenticate against the websocket service.
If you are transport only messages ids that have no meaning .e.g {id =5; action=haschanged}, and then reload the data - it might work for you.
If a pcf control (given the url via parameter) open the websocket and if a event is received calling the notifyOutputChanged() that triggers the reload it might work.
Sorry for all the mights...

cu Flori

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nmk 193 on at

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Hi @Thmit
I am not sure what are we trying to do here? You mentioned in the original post that you want to refresh the page based on a trigger from some server. e.g. a realtime dashboard. and in my view, it may be only possible via creating a custom pcf component. I don't know what is your server using to send out the notification? is it webhook or something else?
I think you need to try out the concept and see how it goes

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Community Power Pla... on at

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I did a similar think as PoC work; Power Apps Canvas model app. will be accessed from some users PC's which have a local peripheral devices. Local web socket server streams data to Power App within PCF.
Notifying output properties within a stream solves my requirement.

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