1. Build advanced PowerApps that work offline!
9/12/2018 3:59 AM
THR2225
Build advanced PowerApps that work offline!
Hemanth Kumar
Engineering manager in PowerApps
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2. Thinking Offline Does your app have to support offline?
9/12/2018 3:59 AM
Thinking Offline
Does your app have to support offline?
What are the different aspects of creating apps that are offline capable.
- Fully capable
- Partially capable.
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3. Core components Connection.Connected and Connection.Metered
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Core components
Connection.Connected and Connection.Metered
SaveData(LocalCollection, “UniqueOfflineFileName")
LoadData(LocalCollection, “UniqueOfflineFileName“,/*Ignore If doesn’t exist*/ true)
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4. Creating an offline sample app
App start?
- How do you handle connected data spurce not being present?
- When do you decide to cache?
Data edits
- what do you do with the data edits/inserts when offline?
Data synchronization on getting back online.
Do you want to handle data conflicts ?
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5. Start with App From Data (here’s the data I am using )

6. Handling App Start App start when connected and when not connected.
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Handling App Start
App start when connected and when not connected.
Assumption is that you have started at least once when connected.
Take care of initializing not only the source databases, but also the supplemental collections that store the offline edits and conflicts in syncing.
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7. OnStart Rule:
Refresh:

8. You can do something fancy if the source data is too big
You can do something fancy if the source data is too big. Cache the filtered version based on what you would need.

9. Handling offline data edit
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Handling offline data edit
The data edits could be:
- Delete on details screen.
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10. Add a new record or update an existing record and submit the form.
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Add a new record or update an existing record and submit the form.
- Override the SubmitForm() function and specialize it (Notice how the change is persisted on the device through SaveData function)
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11. 9/12/2018 3:59 AM
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12. Handling syncing of data when online
Create a screen for reviewing and syncing changed data. You can detect when the device is online and enable the controls to display and sync data.

14. Conflict resolution Create a screen to display the conflicts
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Conflict resolution
Create a screen to display the conflicts
when there are any.
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15. References Soon to be released book ‘Beginning PowerApps’ By Tim Leung
9/12/2018 3:59 AM
References
Soon to be released book ‘Beginning PowerApps’
By Tim Leung
Link:
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Tech Ready 15
9/12/2018
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