Wow, I wish I could mark all of you as "best answer." Massimo -- I was thinking at lunch and wondered if I can calculate the same hash function on the form vars in the browser. I suppose I could at least create a server callback that takes the form.vars and uses the same hashing function to create a hash to compare with the one in the form. Is there an easy way to assemble the same values in the same order as the SQLFORM helper just using client-side javascript? That would make it easier to pass to the controller to hash and compare to the original form hash. (I'd like to do it client-side but Javascript implementations of MD5 might be biting off a little too much.) Would that be easier than comparing each item, given that I have probably 50 or more items in this form?
I could use the callback to set a visual "badge" when something had changed on the form as well as pop up Niphlod's ugly dialog to prevent the user from navigating away and losing his work. Maybe I'll go Paolo one better and make the Submit button blink colors! (That would probably land my site in WebPagesThatSuck.com) -- Joe B. --
