POS by using spreadsheet

MIT App Inventor Help
1

POS Using Spreadsheet

I developed a POS system using a spreadsheet.
However, I encountered some issues with the functionalities.
The sequence of these functions is incorrect.
During queries, I should wait for the results of the query function before proceeding,
but the main program continues to execute directly.
What would be the best way to make the necessary improvements?

HCM.aia (35.2 KB)

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2

You need to move all the blocks that operate on returned filter data from the procedure that requests the filter, to the event block that receives the filtered result.

That global variable will not fill itself magically and immediately.

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