Write to a Json file

[Sunny Afternoons]

Hello, im trying to write a new node to a Json file placed on Dropbox but it dont work. if i made same in windows with notepad, it work. Here is my captured screens. What im doing wrong? Thanks.

[Taifun]

How to upload a file into your Dropbox

see also here http://stackoverflow.com/a/37262976/1545993 how to use external inputs to avoid long nested calculation blocks

Taifun

[Sunny Afternoons]

ok thanks but your example dont add a node. Only upload a file to dropbox.

I need to add a node and update the file and i dont know how. Mi code dont work.

Thanks.

[Taifun]

ok thanks but your example dont add a node. Only upload a file to dropbox.

that's correct

I think, you have to 1. download the file, 2. add the node, 3. upload the file again

unfortunately I do not have an example for 1 and 2 currently

for 1. if you have a public link to the file, then you should be able to download it like this https://puravidaapps.com/filedownload.php

for 2. see again ABG's tips in your other thread https://groups.google.com/d/msg/mitappinventortest/Q6qY79cepY8/IASJT4_fDAAJ

Taifun

[Sunny Afternoons]

Yes, i have a public link but i dont know how to add a node. I do not have any example.

[Taifun]

ABG gave you a nice procedure to encode JSON here https://groups.google.com/d/msg/mitappinventortest/Q6qY79cepY8/IASJT4_fDAAJ

it looks like you did not even take a look at it or play around with it?

see also tip 2 here

Top 5 Tips: How to learn App Inventor

and

• How to work with Lists by Saj
• How to work with Lists and Lists of lists (pdf) by appinventor.org

now try something and if you get stuck, post a screenshot of your relevant blocks including Do it results

Taifun

[Sunny Afternoons]

I see tip 2.

My resultant blocks of your help are this. Nothing has happend. Im lost, very lost. 

[Taifun]

My resultant blocks of your help are this. Nothing has happend

these are the blocks for uploading a file

if you want help about how to add a node into your JSON text, then I suggest you to post the relevant blocks including Do it results

you should be familiar with working with lists and list of lists, see the links form my previous answer

it probably helps to follow these steps

1. use Do it to display the JSON before adding the node

2. convert the JSON format into a list of lists using the JsonTextDecode block from the Web component (again use Do it)

3. find the position where exactly you like to add the node (wich is a list) (again use Do it)

4. use the insert list item block to add the node  (i.e. the list) at the desired position (again use Do it)

5. use Do it again to display the list of lists after adding the node

6. use ABG's procedure to encode the list of lists into JSON format (again use Do it)

how to use Do it, see tip 4 here

Top 5 Tips: How to learn App Inventor

Taifun

[Sunny Afternoons]

Thank you for your help.

I followed the advices of Taifun and I have done the following:

I downloaded the json file from dropbox.

I read the text file into a variable with a function Taifun in puravidaapps (parse).

I added a node manually

I've saved the file.

I have uploaded to dropbox and perfectly replaces the existing one.

With another app, I tried to read the updated file and reads it perfectly.

Thank you for your help.

I leave the screenshots I've used for this example I have to adapt now and texboxes variables.