I found the problem.
....i used value() instead of val().....

Hi Max. Thanks for the docs, but i have used them as reference already ..

var princ = Appery("loan").value();

In this line i declare a variable 'princ' and wants to assign the value from the input field 'loan' to the variable - but is getting error as mention earlier.

var princ = Appery("loan").value();

When debugging i get a message "Uncaught error: Object has not method 'value

Hi Max,
I would expect the result of the calculation to show in textfield "pay" - get nothing happens when clicking on the caculate button.

When debugging i get a message "Uncaught error: Object has not method 'value'"

Thank you