Yes, the 3 list are on he same screen at the same time.
To be very precise: First “category” is loaded. On selection a query is send in order to receive the elements for “tooling”
A third query is run only at “Initialise”, that fills the “material” list.
That came to my mind as I reviewed your code and the other suggestion. I need to take a more php-like approach when it comes to logic, variables, globals, if-then statements etc.
Use your php scripts and the return will be handled in Kodular blocks. And that part of treating the Json return, you’ve already done it. So now, it’s creating your scripts (and consuming them as APIs) passing parameters (POST) or simply getting the return (GET)
Why POST to send and GET to retrieve? (What’s in a name…)
I could use POST to get a result from the server as well. Now I send values to the server by putting them in an url. What would be the advantage of using POST in this case?