Handling NaN

A

Alex Fung

Hi, I have 2 optional sections. Each optional sections contains a text box (A & B)where users entered a number (default value is 0). A third text box control (C) located outside of the 2 optional sections adds A and B. When the form is first loaded, the two optional sections are collapsed, and text box C displays NaN. Only when I expand both optional sections would text box C change to 0. Is there any way for me to display 0 when one or more of the optional sections are collapsed?

Thanks,
Alex
 

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