Hello Taifun,
sorry, but I didn't read your answer earlier. By the way, meanwhile I have been busy with learning HTML/CSS/JS (W3Schools), to avoid "poor practice", a little bit of all. But this has dramatically changed my comprehension. I've now created some blocks (it's only a small selection of them here) which allow to interact very well with the AI - sorting and editing a list using the WebViewer. Appended the AIA.file. One can pick a task from the spinner, the result is shown on the right, the relevant code of that function on the left. All used functions are collected in the file: "AppInventor_JS.txt" which has been put to the app's package. The app reads the file, creates a list of functions and selects one from the spinner. I think it is very easy to understand and follow. For that I've cleaned up the blocks screen. 
AppInventor_JS.txt (2.2 KB) WebViewer_interactionWithAI.aia (13.7 KB)
