Creating a simple calculator

Hi all. I realize this might fall into the dumb question category, but I can't find any tutorials or walkthroughs on it.
I want to make a simple calculator. The user inputs the variables and that changes the values displayed.
I have all of the formulas as a table in Excel. I imported the data source (Excel), created a gallery and connected the various input and text boxes to the corresponding column labels in Excel.
But when you change the values in the text input box the other fields don't change. It's almost like Siena forgot the formulas and is just displaying the text.
Any help or directions to a tutorial would be greatly appreciated.
Thanks!

Hi,
When importing data from Excel, Siena retains the values not the initial formula. So you will need to create these formula using Siena expressions.
As a simple example, let's assume you want to add the values of two input visuals and display the result in a lablel, the text expression of that label would be:
label: InputText1!Text+InputText2!Text
Olivier

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First of all, I don't
know how to append text to a textfield.
textField.setText( textField.getText() + TEXT_YOU_WANT_TO_APPEND );
Then,
when the user clicks one of the buttons, the compiler
goes crazy, and nothing is displayed.No, the compiler doesn't go crazy, the compiler has done it's job by then. However, you do get a NullPointerException, and the stacktrace tells you that the problem is on the following line:
txtDisplay.setText(strNames);
It turns out that strNames is null. I leave it to you to find out why. ;-)

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Message was edited by:
Jeff Hohman

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