Question about how to keep and retrieve the location on the txt file

[h_h]

Good day, every POWER USER!!!
Always I really appreciate all power users help.
I came to a conclusion today once again that there is no way to settle my trouble without your help.

My blocks are like the attached picture.
My txt file has many rows.
I saw to 11th row today for example, so I want to see from 12th row(or 11th) next.
So I inserted the block like ‘picture 2’, and it works well on the app inventor, but it doesn’t work on the actual app. Of cause the value of ‘here_before’ was stored in the tinyDB1 in advance.
It works well under the only block of ‘picture 1’, though it can’t remember the list I want.

(Q 1) How can I settle this problem?
(Q 2) In addition, I’d like to know to store based on the an item (herein ‘ID”), not based on the index

[yusufcihan]

If I understood correctly;

@h_h

In addition, I’d like to know to store based on the an item (herein ‘ID”), not based on the index.

You can use index in list block to know index of specific element in list.

@h_h

So I made the block like ‘picture 2’, and it works well on the app inventor in spite of the warning signal, but it doesn’t work on the actual app. Of cause the tag of ‘here_before’ was stored in the tinyDB1 in advance.

You need to declare/initialize the variable with a constant value, even if variable is not constant. As TinyDB is not returns a constant value, it gives an error when you do that.

However, you can set the variable value after declaring, for example at Screen.Initialize.

I hope this helps!

[h_h]

Thank you for your answer.

Maybe my questions were insufficient as much you could answer, I think.

I am sorry against that.

The matter was that I couldn’t get the value when the app was reopened, that has settled like below picture.

Then could you get me a way to settle Q 2?

Merry Christmas and a Happy New Year!

[ABG]

See this thread for a general purpose table filter based on
header row 1 of the input Comma Separated Values (CSV) table:
https://groups.google.com/d/msg/mitappinventortest/7jsH889DYt8/R66q86OXCQAJ

[Taifun]

@h_h

The matter was that I couldn’t get the value when the app was reopened, that has settled like below picture.

what about using 0 as valueIfTagNotThere?
no need for using an if statement...

Taifun

---

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