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SaveData and Populating Dropdown and Combo box

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Posted on by Community Power Pla... Microsoft Employee

Hi Everyone,

I have an app that scans barcodes, and collects them.

There are also DropDown boxes / Combo Box , and the selected values are collected while being scanned. (Each selected value is applied to each scan)

This app uses SaveData after each scan. So once you leave the app, it's able to restore the data as LoadData is applied OnStart.

When I exit the app, and reopen it. The selected values from DropDown boxes / Combo Box are empty again.

How can I populate the Dropdownboxes with SaveData information in the collection?

Thank you,

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Building Power Apps

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WarrenBelz 155,675 Most Valuable Professional on at

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Hi @Anonymous ,
What are the Items of the drop-downs? They need to be based on the collection (or hard-coded) if you are wanting them to work offline.

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v-bofeng-msft Microsoft Employee on at

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Hi @Anonymous :
I think I may understand what you mean, if my understanding is incorrect, please help me to point it out.
The BarcodeScanner OnScan event performs the following operations:
1)Collect barcode into collection
2)Save the collection locally
Load the collection when the app opens
When the program is opened, the dropdown control selects the most recently scanned barcode by default
I think this can be achieved by setting the default property of the dropdown control.
I've made a test for your reference:
1\OnStart:

LoadData( MyItems, "LocalSavedItems" ) /*MyItems is my custom collection*/

2\Add a BarcodeScanner control(BarcodeScanner1):
OnScan:

Collect(MyItems,{Barcode:BarcodeScanner1.Value,date:Now()}); /*Record scan time is used to filter the last scan record*/ SaveData( MyItems, "LocalSavedItems" )

3\Add a dropdown control:
Items:

MyItems

Default:

First(Sort(MyItems,date,Descending)).Barcode

I tested it on my phone. Every time I reopen the app, the dropdown control always selects the most recently scanned barcode by default
Best Regards,
Bof

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