textbox text change from client side event

hi,

to do any calculation used onblur instead of on change event, because onchange event not fired on certain scenario.

Please refer below link for example of calculation using onblur event

http://cscie12.dce.harvard.edu/lecture_notes/2003-04/20040406/calculation2.html
http://www.kirupa.com/forum/showthread.php?289699-javascript-calculating-form

hope this will help you.

You can use OnChange event of the textbox and assign javascript function which consists of the references to the other text box values.

Before that, validate if my understanding is correct:

You have two text boxes tb1 and tb2 for inputting.

If you change value in one of the textbox, it should calculate and change the value of another text box where you will display the calculated value.

Let me know if it is correct. Or provide me some more information.