COB ESPC18 - Rich PowerApps with offline support

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Enterprise PowerApps – Rich Apps
with Offline Support and On-
Premises Data
Chris O’Brien (MVP)
Independent/Content and Co...

Use Excel-like formulas – not code
To do Formula
“Next” button to change screen Navigate(MyScreen, ScreenTransition.Fade)
...

Not required

The mobile experience
PowerApps app must be installed from App
Store
Apps appear within the PowerApps app

Types of
PowerApps
Canvas apps
Model-driven apps
Customised
SharePoint list forms

Customising SP forms vs. canvas apps
Customised SP forms:
Other considerations:

CASE STUDY APP
Pilot/crew leave requests

The scenario
POC for airline pilots (leave requests)
Flying a plane is the perfect time!
Offline support
Ability to connec...

DEMO – Leave
Requests
PowerApp

Flow

Implementing the PowerApp
Key findings
Some surprises

Functions for SharePoint data
Patch
• Add list item
Collect
• Fetch list item
Update
• Update list item
Delete
• Remove
Mu...

A Patch command in our app

A Patch command in our app (formatted)

Implementing offline support
Pattern
Poll for local
record –
LoadData/ForAll
PATCH if
connected
Navigate to
confirmation
s...

On-premises data gateway
Considerations

Working with data
Connection is hit when:
Data-related functions:
Connection (e.g.
a database)
Data source
(e.g. a table)

Using a Gallery control for navigation
The pattern
On start - define
collection of screens
(with ClearCollect)
Gallery OnS...

DEMO –
Implementing
offline and
integrating data

PowerApps tips
Performance, key functions, responsive apps

Tips – key PowerApps functions
To do Use
Set a global variable available across all screens Set()
Set a context variable i...

Tips
Get used to:
Lots of fiddly work to generate PATCH command 
Adding a “debug screen” with labels showing variables et...

Be careful loading data sources
Tips - performance
https://powerapps.microsoft.com/en-
us/blog/tips-for-a-maintainable-ext...

Tips - using PATCH with SharePoint fields
To do Use
Update a choice/lookup from a dropdown Paternity_LengthOfPaternityLeav...

Responsive canvas apps
Adapt to screen size – not just phone/tablet choice
+ -

PowerApps
- the good

PowerApps
- the bad

PowerApps
- the ugly

My favourite recent/upcoming features
Available or in preview
• PowerApps web part in SharePoint!
• New size/layout option...

Takeaways
PowerApps can be VERY transformative for an org with lots of forms/processes
Very easy to get apps onto mobile d...

Resources
https://cob-sp.com/PowerAppsVideos
https://cob-sp.com/2QjvG5y
https://powerapps.microsoft.com/en-
us/blog/

Thank you!! 
Any questions?
www.sharepointnutsandbolts.com
@ChrisO_Brien

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