Canteen App (Cart)

MIT App Inventor Help
23

I looked at your code.

I don't see how you can proceed further without being able to do a table lookup.

Come back when you can show that.

1 Like
24

This is caused by you trying to cram an entire list into a single cell in your Google Form.

There are two different ways to avoid this:

  • Send one Form to start the order and give it a unique timestamp ID, then send detail order item forms, one per food, telling how many of that food are in that order, and the subtotal cost for that food.

  • Extend your order sheet to the right with columns for every food in the menu, identifying the food in row 1, and listing the quantity requested (default 0) or cost in that column against each order row. That would allow you to send a single Google Form for the entire order, but it would be really long, as long as your menu.

1 Like
25

I don't even know the basics of MIT so much. This was made by a tutorial for a school project which then turned into an app as it was the only coded one made. So, I hope you understand and tell me from the basics.

26

This is something I don't know

27

This is a lot more summarized. I hope you can give it in detail. Please don't be angry. I know this is awkward for someone to make an app without any knowledge. I know but this was just a school project turned into an app.

28

Let me suggest you to start learning some basics then...

A very good way to learn App Inventor is to read the free Inventor's Manual here in the AI2 free online eBook App Inventor 2 Book: Create Your Own Android Apps ... the links are at the bottom of the Web page. The book 'teaches' users how to program with AI2 blocks.
There is a free programming course here Course In A Box and the aia files for the projects in the book are here: App Inventor 2 Book: Create Your Own Android Apps
How to do a lot of basic things with App Inventor are described here: How do you...? .

Also do the tutorials Our Tutorials! to learn the basics of App Inventor, then try something and follow the Top 5 Tips: How to learn App Inventor

Taifun

Trying to push the limits! Snippets, Tutorials and Extensions from Pura Vida Apps by icon24 Taifun.

1 Like
30

I am not angry.

I am stumped.

My ability to explain does not reach far enough to cover your ability to understand or your experience.

1 Like
31

If you can explain with the help of codes. I think that may work.

32

Please help. I am confused what table lookup is or from where to start.

33

is this it?

34

Table lookup is when you look in a table to answer a question like "how much does this menu item cost?"

You are already doing this in asking TinyDB for a tag value, or when you use the list block Look up In Pairs or use the spreadsheet function =VLookup () or when you use an AI2 dictionary.

1 Like
35

There was this person @SteveJG, who said to use a dolt. What is it. I can't find it on internet.

36

and is the video correct for table lookup?

37
1 Like
38

@SteveJG there's nothing like dolt

dolt
dolt1899×874 81.7 KB

40

Sorry, DoIt used to be described there. Try here:
http://twodogapps.com/?page_id=686#DoIt

and

http://www.appinventor.org/Engineering2

1 Like
41

Use the companion app and Do it to debug your blocks, see also tip 4 here App Inventor: How to Learn | Pura Vida Apps
see also Live Development, Testing, and Debugging Tools

Taifun

Trying to push the limits! Snippets, Tutorials and Extensions from Pura Vida Apps by icon24 Taifun.

1 Like
43

I tried using Do It, but it wasn't that helpful. (Maybe I didn't use correctly)

44

@SteveJG or @ABG please help

45

Do It does not work on When blocks.

1 Like