Mailinglist signup doesn't redirect to our desired section/anchor

[mmmavis]

#654 has been merged and pushed staging. For testing purposes, I changed BSD config so that we are redirecting user to https://teach.mofostaging.net/events/?mailinglist=thanks#mailinglist for thank you message. However, BSD appends a bunch of query strings to the URL (e.g., https://teach.mofostaging.net/events/?mailinglist=thanks#mailinglist&action_code=FgxRWxYUOVIKQV0YAFIETFM&td=TVDLTsMwEPwVyycqNandpiQNF04gDhVIcECiyHKSbWPh2JEfFQ_x76zbqsXywTuzs7OeHwqDVJrWdJB75QP4wOcLzvltD1rbM6jMLjcQ6JQ66JSDNojokgwRsYuqOz1FI1EWTpUdg9gnzkStp9Tb6FpArpEeDnrEYnOGsRx7a-DcHyy6ia3S4Gn99o6I2pk4iq11gzh48rJEVetABhBd8p0zvszYMuNzwop6UdTF9aVDjUJ2ncO2kuXlKucVzyt24aMHJ-QOTJq0tt9Ka7mZLXNGrtayVSZY39-QBxNAEwTI4zN5JZzlqxvi9vWizNmE3EP7YTcz3IPh5eQO49raz80s0cmql2NAm7Q_n9JGR9xcKv-FhDLHbxXQlk2xaLMGmirjHIqs6lYyY_8Ojko5GDmk7NbyAxx5ki58kedDSuQKafICsu2JVwEmKBhsFzWcJMcw6e8f) and that breaks the "jump" - page doesn't scroll to the #mailinglist form where the thank you message is shown.

[mmmavis]

can we fix this by something like

if (this.context.router.getCurrentQuery().mailinglist === "thanks") {
    window.location.hash = "mailinglist";
}

and remove hash from our redirect URL? 😬

[toolness]

Hmm, that might work, though I'm not sure if it'd work on all browsers... Another option is to do something similar to #567 and actually show a modal!

[hannahkane]

Just a note that we should prioritize this. MP communications start next week, so we should have this in place by then.

[toolness]

Ok. @sabrinang do you have any advice on the UX for this? I'm thinking that a modal would actually be more obvious/noticeable to users than the current design, which just puts the words "Thanks for signing up" in place of the form--we could hack-in ways to make the page scroll to that location on page load, such as mavis's suggestion above, but doing a modal would be more sure-fire from a technical standpoint since we already do it in other parts of the code. If it's a UX win too, then I recommend we just go with the modal, but otherwise we can try some hacks to ensure that the page scrolls to the right place when BSD brings them back to the site.