Is `send/forward` what you need? Den fre. 20. sep. 2019 kl. 11.43 skrev Marc Kaufmann < marc.kaufman...@gmail.com>:
> Hi all, > > disclaimer: I am guessing that my current design simply doesn't allow me > (easily) what I want, but there may be a solution I am unaware of. > > In my Racket-powered website I want to disable the back button or keep > people from using the back button to resubmit (with different data) a > previous form or hit a link that is an embedded continuation to a function > that should not be called twice. > > One way I can do this is to set some variable in the database when the > form is submitted or one of several links clicked on a page and check > whether it already is set and disallow new submits (or some such). However, > I want to do this in many places and don't want to sprinkle all my code and > database with names that I can't track. I tried to achieve this by defining > a new variable in the request itself that I set to #false initially and > then set! to true when any link is hit -- but this fails if a person comes > back, refreshes the page and clicks the link, since this creates a new > instance of the variable. > > Qualtrics surveys have this feature, but the way they implement it is (I > think) by being single-page apps where the 'Next' button loads the new page > content via an Ajax call. I don't see how to turn my current website into > that without substantial rewrites. > > Cheers, > Marc > > -- > You received this message because you are subscribed to the Google Groups > "Racket Users" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to racket-users+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/racket-users/7e356eb4-e886-4f9c-90cd-0db658d14a91%40googlegroups.com > <https://groups.google.com/d/msgid/racket-users/7e356eb4-e886-4f9c-90cd-0db658d14a91%40googlegroups.com?utm_medium=email&utm_source=footer> > . > -- -- Jens Axel Søgaard -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/racket-users/CABefVgzmMJMrqjAF4JXJU7txX9hU5HWBrfREP915j8ggi%3Dmt5w%40mail.gmail.com.
