Your users might be presented with a form like this:
An example code might look like this:
This code could be entered as:
ti3pzlmpeobs (try it
now to see the auto-correction in action).
More sample codes:
CouponCodes are designed to be distributed in printed form and typed
into a web form. Features of the codes that make them well suited to
- The codes are not case sensitive.
- Not all letters and numbers are used, so if a person enters the
letter 'O' we can automatically correct it to the digit '0'
(similarly for I ⇨ 1, S ⇨ 5, Z ⇨ 2).
- The 4th character of each part is a checkdigit, so client-side
scripting can be used to highlight parts which have been mis-typed,
before the code is even submitted to the application's back-end
- The checkdigit algorithm takes into account the position of the
part being keyed. So for example '1K7Q' might be valid in the first
part but not in the second so if a user typed the parts in the wrong
boxes then their error could be highlighted.
- The code generation algorithm avoids 'undesirable' codes. For
example any code in which transposed characters happen to result in a
valid checkdigit will be skipped. Any generated part which happens to
spell an 'inappropriate' 4-letter word (e.g.: 'P00P') will also be
Codes can be generated and validated on the server using the
Algorithm::CouponCode Perl Module.
Code and documentation are now