Beginners question how to use variables

cappy0815 · November 4, 2020, 6:44pm

Hi,
I am quite new with MIT App Inventor since today.
Some tests with doing things on klicking buttons have been successful.

Now I want to calculate something.

I have 2 input text field ans one for the calculated output.
I try to get the value of one field to set a variable.

After use the value with math I wanna set the out put text field to this var.

I don't know why but it does not work.

Thanks for help
Cappy

cappy0815 · November 4, 2020, 6:49pm

Oh btw.

set Pulse100.Text to "test"

(simple text) works well

ABG · November 4, 2020, 6:50pm

~~You used component blocks, where you should have used component.Text blocks.~~

Your global variables set to components are only usable if your are going to be doing advanced component juggling, with multiple components.

Get rid of them, and use component.Text blocks directly in your pph formula.

cappy0815 · November 4, 2020, 10:44pm

Hi,

thanks for your reply.
Can you describe a little closer how to use component text blocks?

Boban · November 4, 2020, 11:00pm

bild

Boban · November 4, 2020, 11:05pm

Some good snippets and tutorials

Tutorials for MIT App Inventor

ABG · November 4, 2020, 11:07pm

I fell into that global initialize trap then realized that would not provide new input to the formula.

ABG · November 4, 2020, 11:09pm

cappy0815 · November 5, 2020, 7:21am

Hi all,

I got it working last night this way ...

I know, I am not using vars ... but it this case I don't need!?
Any concerns?

Thanks

Boban · November 5, 2020, 7:42am

Not at all

ABG · November 5, 2020, 2:24pm

When programming,
less is better.