First pass at Supporter Night form.

This is my first pass of the supporter night form with necessary
Javascript and CSS.

Use only on0/os0/on1/os1 options with PayPal.

According to these URLs:
https://www.paypal.com/cgi-bin/webscr?cmd=p/xcl/rec/options-help-outside
https://developer.paypal.com/webapps/developer/docs/classic/paypal-payments-standard/integration-guide/Appx_websitestandard_htmlvariables/

only two Options are supported via PayPal. I was fooled initially
because other fields *did* come through and *did* show up on the web
interface, but they are *not* accessible via the SOAP interface.

Therefore, I've switched to using the hack described here:
https://ppmts.custhelp.com/app/answers/detail/a_id/298/kw/soap%20gettransactiondetails%20option

to get 4 fields of data for Supporter transactions.

progressbar Javascript need not change for content

The content of the amounts for the fundraiser can be kept in the HTML
rather than the progress bar Javscript code.

I suspect at some point I should keep this data in the Django database
and extract it from there as dynamic content.

Progress bar & $5k triple-match program.

An anonymous donor is matching up to $5k at 2-to-1 for supporter
donations. Therefore, update the page to include a progress bar for
this, and add notes about it in various places.

Start errors in shown state for non-Javascript.

Since the error messages have important information, and since the
Javascript code is the only "enforcer" of the minimum donation, the
errors really should be displayed by default if the browser is not
Javascript-capable. This change does that, but also toggles the state
back so that errors are not shown until needed in Javascript-capable
browsers.

I believe this still fits graceful degradation, since browsers without
Javascript and CSS were already showing the errors anyway, so now the
only real change is that everyone sees the errors by default.

It *might* make sense to not show the errors in red in non-Javascript
browsers (i.e., make the default CSS color black for the form-error-show
class, and then change it to red in the Javascript). I didn't make that
so, because it's not clear to me that's right, and we *do* want to draw
attention to the errors lest people become a supporter below the
minimum (which has happened once already -- that precipitated this
change).

I'm still annoyed that PayPal doesn't provide a "minimum but no maximum"
variable donation box of its own, which would solve this problem
outright.

Match right form for these changes.

The general selectors previously used here matched either form. With
this change, they will only match the form for which the selection was
actually made.

Rework Javascript final form validation.

The problem before was that an error in the annual form would prevent
submission of the monthly form and vice-versa. That is herein corrected
with this change, which assures that the input with id of "amount" if
the specific form (id'd with "annual" or "monthly") is the only one
checked.

Return amount to id; add id for error span.

I actually think I want amount to be id rather than a class, now that I
figured out the proper selector to find them all.

Also, the $("span", input.parent()) was buggy if there were any other
span's other than error-related ones in the supporter-form-inputs div.

Finally, ditch that <small> stuff and simply place a font-size reduction
into the CSS for the form-error-show.

Modify PayPal "no_shipping" var via t-shirt choice

According to
https://developer.paypal.com/docs/classic/paypal-payments-standard/integration-guide/Appx_websitestandard_htmlvariables/

no_shipping has the following values:
0: prompt for an address, but do not require one
1: do not prompt for an address
2: prompt for an address, and require one
The default is 0.

Ideally, any time they change wantGift, even in a pure HTML form, we'd
change it between 0 and 2 as appropriate (i.e., we need the address if
they want the t-shirt).

However, I couldn't find an easy way to make this modification in pure
CSS or HTML, so it only happens in Javascript-enabled browsers.

This is still graceful degradation, since the only impact is in cases
where a non-Javascript user fails to give us an address, and we have to
email later to get the shipping address.

Monthly supporter can enter variable amount.

This required some doing. I'm not completely sure it works, but I
roughly followed the tutorial available at:
https://www.paypal.com/webapps/mpp/get-started/create-recurring-donation-button
with back-reference to this:
https://developer.paypal.com/docs/classic/paypal-payments-standard/integration-guide/Appx_websitestandard_htmlvariables/

My main concern with this setup currently is that 'p3' must be set to
'1', which would seem from the documentation to be saying the payment
will recur only once. There is a subtle hint via the tutorial that
setting 'src' to 1 will override 'p3' with whatever is found in 'srt',
but that's not said anywhere explicitly that I can find. So, I'm going
with this and I'll just test it myself with a monthly subscription to
see if it's indefinite (which is the behavior we herein desire).

Finally, note that "amount" is now a class rather than id, since I'm now
using the associated jQuery .on('input') code for both the annual and
monthly amount boxes.

Change default to "no t-shirt".

I suspect some supporters are just accepting the default, so by default,
the t-shirt option will be "No", and supporters will have to
affirmatively chose "Yes".

Thanks to previously committed Javascript hack, users with Javascript
capable browsers should avoid seeing the t-shirt sizing options until
they chose "Yes".

Hide t-shirt size selector when t-shirt's unwanted

Use Javascript to hide the t-shirt size selector when the the user
selects "No" for "Do you want a t-shirt?". Reshow it (and make sure
it's shown by default) for "Yes".

Correct Markdown-style footnote w/ HTML style one.

This footnote is now correctly formatted in HTML, with links back and
forth, as well as a jQuery UI tooltip popup for the footnote.

Simply clear error for monthly donation.

Since the error messages relate only to the amount entered, the error
message should be cleared when switching to the monthly giving option.

Amount starts class "valid", when default accepted

The default amount of $120 appears in the amount field, but the class
"valid" was usually only added when the user changes the amount.

The valid class must be added at the start to ensure someone simply
clicking with the default still can donate.

Larger error message when submitting bad amount.

This addition to the Javascript and text ensures a clear message to the
user of a Javascript-enabled browser that there is an issue with the
amount. Also, it prevents submission of the form until the amount is
correct.

A user with Javascript disabled can circumvent these validation steps;
however, the worst-case scenario is that they make a donation for less
than $120 that is categorized in Conservancy's internal system as a
Supporter donation, and we'll be adding internal checks to find that.

Correct regular expression and comma thing fully.

parseInt() likely wants no commas, so we use a value without it, and the
regular expression now seems to properly match was PayPal will take as
valid.

Subscriptions for monthly supporters.

There are now two options at the bottom of the page, annual and monthly
supporters.

In addition, there is Javascript code to cause the annual and monthly
items disappear and reappear upon selection either in the donate box or
the selector above the items.

I tested this in links and it seems to degrade reasonably well.

Rework form with error messages & basic validation

Since PayPal cannot seem to be cajoled into verifying a minimum amount,
we have to do it here with Javascript. This isn't perfect validation:
the form can currently still be submitted with an amount less than $120,
but at least this way Javascript-enabled browsers might prevent some
folks from doing that.