EditGallery saving blank entry if there is no input (Using barcode)

[pa7292]

Hi  I am trying to replicate a working app that I did but copying and asking questions here but I have reached the end of my patience after 2 days. The first app I did, works fine with no issues, I basically copied everything from it but I can't seem to replicate the success. 

I have an EditForm where a barcode scanner that captures the data and puts it on a datacard as a value, gets saved to a sharepoint list. This part works perfectly, the only problem is that if due to a user error, if he opens the EditForm, did not scan any data and saves it, the existing serial number (Data) is overwritten by a blank input. 

Barcode OnScan = UpdateContext({scannedValue: First(BarcodeReader1.Barcodes).Value})

DataCard Default = scannedValue 

EditScreen (Where the EditForm is) On.Visible = UpdateContext({scannedValue: Blank()})

Kind regards

[poweractivate]

You can try not to allow the Edit Form to be opened in any other way than it automatically navigating to the screen with the Edit form on it, right after scanning the barcode successfully.

You could also try checking OnVisible or wherever the Blank value is set, and remove the line that is setting the barcode value to Blank(). 

Or, you could allow the form to be opened, let it reset to blank, however, you could add something on Submit that does not allow saving the record if the barcode value is blank. If you do this, you may want to try to add functionality that lets the user scan the barcode and it populate on the existing screen so they don't have to start over.

[pa7292]

Hi poweractivate, Thank you for your quick reply. 

I think option 3 would be the best where it will not allow submit if the barcode value is blank, but being a newbie on powerapps, I have no idea how to execute this. 

I tried removing the line that sets the value to Blank() but get no results, maybe I am doing it wrong. 

Kind regards

[poweractivate · Accepted solution]

@pa7292 In DisplayMode property of your existing Submit button add this formula:

If(
	IsBlank(Your_Barcode_DataCard.Update),
	DisplayMode.Disabled,
	DisplayMode.Edit
)

This should grey out the Submit button and make it not do anything when clicked, until the barcode field has a value.
Check if it helps @pa7292 

[pa7292]

@poweractivate 

That is awesome! I think this is the best way to do this. Removes the possibility of making an error that someone can delete the serial number by accident. Really appreciate your help. 

I just tweaked it a bit by experimenting/accident since DataCard.Update is not being accepted. So as a service to to the other people who might need this answer in the future. 

If(
	IsBlank(Your_Barcode_DataCard.Text),
	DisplayMode.Disabled,
	DisplayMode.Edit
)

Kind regards