Listpicker after picking show content not working

[Jack Tribhuvan]

Hi all,

I am very new to app inventor and not even a developer but app inventor is very easy to make apps so trying to make a song book app.

I have been stuck and have searched everywhere possible but not able to get solution, so I had to post a new topic.

The problem is that after clicking "A" listpicker the list of songs starting from "A" loads but after I choose a song from the list I am not able to show it on the second screen webviewer component. I have uploaded the song html page to media and trying to use tinydb component.

Tried many things but the screen two opens as blank. How do I link listpicker to tinydb to webviewer on second screen.

Thanks it would be a great help.

Jack  

[Hossein Amerkashi]

Please post screenshot of your relevant blocks to help us see what you are doing.

-Hossein.

http://AppyBuilder.com

[Jack Tribhuvan]

First thanks for giving time for me.

please find below the screenshot

This is screen 1

This is screen 2

Thanks again please help me where I am going wrong

[Peter Mathijssen]

I didn't look at everything but the first thing i noticed was dat you use the tag "Url" and "URL". For AI these are two different tags as far as i know.

[Jack Tribhuvan]

Hi Peter,

I have tried "Url" also instead of URL.

Even though it does not work

Jack

[Jack Tribhuvan]

Hi, 

Yes Peter I am sorry the difference of URL and Url had created the problem 

I changed all to URL and it is working, Thanks a lot I would have never notice this error.

Please I have two more Questions

1) Can I add 25 Listpickers with different lists same as above and I can have only 1 global list and 1 start url list.

2) I have nearly 700+ hymn songs do I will have to upload 700 html files is this OK or do I have another method.

Please suggest.

Thanks I am glad I posted here

[Taifun]

see the following tips and in your case especially #3 and #4

1. switch screens correctly 
   The recommended method of switching screens in App Inventor
   
   
follow these recommendations Using Images with App Inventor



2. avoid redundancy

   probably it helps to read chapter 19 - 21 in Dave's book http://www.appinventor.org/book2 to get an idea how to do DRY programming with App Inventor https://en.wikipedia.org/wiki/Don%27t_repeat_yourself
   
   

3. reuse your components, see also Building apps with many screens and https://groups.google.com/forum/#!msg/mitappinventortest/YBAfURWv-tY/Ivqx6XcmDgAJ
   
   
4. How to overcome the App Inventor project limit of 10 MB
   

Taifun

---

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

[Jack Tribhuvan]

Thanks Taifun for the links I have read them now I am more familiar with list.

But should I add 700+ html files as each page has to shown individually.

Jack

[Taifun]

you can try that and in case you reach the limit, see here