Combine two textfield in seperate textfield

Let say I have:
textfield A1 with text Green Salad and value box1=1
textfield A2 with text Crab Salad and value box2=1
textfield A3 with text Tuna Salad and value box3=0
textfield A4 with text Chicken Salad and value box4=1

I want all the A1 tot A4 text combine into new textfield with a script, like a summary when the box value is greater than zero.

It should be looking like this:

Green Salad
Crab Salad
Chicken Salad

I have tried several script but non seemed to place multiple textfield into 1 field.

Some got a simple script for me?