Question

I am using Telerik controls in an ASP.Net application for invoice entry.

I’m looking for the ability to enter multiple amounts in one numeric field and add them together, just like in Quickbooks.

Keystrokes:

=0.12+3.45TAB or ENTER

adds values to 3.57 and jumps to the next field.

Anyone has any ideas?

Answer 1

You have three choices here:

1. Write your own method to parse the formula (more complicated than it sounds, even if you think it sounds complicated).
2. Use an pre-written math parser. This is a decent one.
3. Use eval().

NOTE: Should you choose option #3, exercise extreme caution and do your research first. eval() can leave your application open to all sorts of nasty code injection.