www.beaconreader.com - can't delete digits in "amount" field

[hallvors]

URL: https://www.beaconreader.com/projects/facts-not-fear-the-truth-about-encryption/back
Browser / Version: Firefox Mobile 46.0
Operating System: Android
Problem type: Something else - I'll add details below

Steps to Reproduce

1. Navigate to: https://www.beaconreader.com/projects/facts-not-fear-the-truth-about-encryption/back
2. Choose the "No thanks, I just want to make a pledge" radio button
3. Focus text field for amount
4. Try to use backspace

Expected Behavior:
Able to delete
Actual Behavior:
Nothing happens

[hallvors]

$('.amount').keypress(function(e) {
var a = [];
var k = e.which;
for (i = 48; i < 58; i++)
a.push(i);
if (!(a.indexOf(k)>=0))
e.preventDefault();
});

This code intends to disallow anything but digits.
The underlying incompatibility is the fact Firefox sends a keypress event for the backspace key. Test here: http://unixpapa.com/js/testkey.html

[hallvors]

I've reported https://bugzilla.mozilla.org/show_bug.cgi?id=1261309 but we may also reach out to them and suggest changing their JS to include backspace (key 8) in the array of allowed keys.

[adamopenweb]

The team members are all listed on the site. Reaching out to one of them: https://twitter.com/AdamOpenWeb/status/715912632910356480

[sagrid]

If that counts, works on latest ff 45.

[adamopenweb]

No response on Twitter. We will have to try another contact.

[wisniewskit]

This is actually a dupe of bug 968056, so marking it as such.