Canteen App (Cart)

[Akshat_Kumar]

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

[Akshat_Kumar]

@ABG

table lookup.

How to display data in Table Format in MIT App Inventor 2

is this it?

[ABG]

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.

[Akshat_Kumar]

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

@SteveJG

Use DoIt to see what is happing and/or make a simple Project showing this behavior an post it?

[Akshat_Kumar]

and is the video correct for table lookup?

[SteveJG]

@Akshat_Kumar

use a dolt

• Live Development, Testing, and Debugging Tools

[Akshat_Kumar]

@SteveJG there's nothing like dolt

[SteveJG]

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

and

http://www.appinventor.org/Engineering2

[Taifun]

@Akshat_Kumar

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

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

FAQ Section: Debugging

Introductory Testing techniques, including DoIt - MIT How to Read and Understand a Runtime Error Message - @ABG Common Runtime Errors - @TimAI2 Advanced Do It' to view procedure results, event arguments and local variables How to run Logcat How to use Do It in a loop Screen1.ErrorOccured message numbers SteveJG monster list of things you should not do How to show raw responseContent from your app when debugging - TimAI2 Video of copying Do It responseContent results into a board post …

Taifun

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

[Akshat_Kumar]

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

[Akshat_Kumar]

@SteveJG or @ABG please help

[ABG]

@Akshat_Kumar

I didn't use correctly

Do It does not work on When blocks.

[Akshat_Kumar]

@SteveJG and @ABG I have tried whatever you told me but it doesn't work either. I hope you can try to help me with codes that would be a great help because I think there are only 2 places where this is happening because of which instead of 2 items 1 item is coming.

1st place

2nd place

[Akshat_Kumar]

in the first place as you see the tag: join get selected starters
I even tried listpickerstarters but nothing happened. same result

[ABG]

Apply Do It with the companion to see what is in the taglist and the list you are building up

Show us the results.

[ABG]

Also, explain to us how you are using TinyDB.

What are the tags, and what are their values?

Also, how does that help you?

[Akshat_Kumar]

TinyDB is being used to get the items the person has selected. For that purpose, there are 2 TinyDB.
Tags are used to get the item's name/title/topic.
It helps me to get the item's name on the cart screen.

[ABG]

Your answer is not specific enough.

A description of a tag and value setup must include the word 'of' as in these samples:

Price of a menu item

Birthday of a friend (by unique name)

Debt of a customer (by name)

In all cases the name after 'of' is the tag and the value is before the 'of'

So answer the question using 'of'

Also, multiple TinyDBs need more descriptive names and different Namespaces, to avoid mixing up the debt and birthday of the same person.

[Akshat_Kumar]

So how to put it in codes?

[ABG]

Go back and reread my Fruit Stand sample.