JavaScript Flip Counter

问题:

I would like to include a flip counter on my site, similar to what Apple was using for their 1 billion app countdown.

Can anyone get their JavaScript to work standalone?

If anyone can provide working code, that would be great.

回答1:

They're using a combination of CSS and JavaScript. The flip animation is powered by a CSS Sprite-like technique.

First of all, they have a very tall image called filmstrip.png that contains every flip "state" for each number (0 to 9; have a look at a scaled-down detail and you'll see what I mean).

Then, in the HTML, each digit is made up of three nested elements:

• The first is a container element, which has its width and height set to the dimensions of a single flip "state", and its overflow set to hidden. This element is positioned relatively.

• The second element is positioned absolutely (and because the first element is positioned relatively, this second element is positioned absolutely relative to the first element).

• The third element has its background-image set to filmstrip.png, and its width and height set to the dimensions of this image.

The JavaScript then seems to rapidly change the top property of the second element, causing different parts of filmstrip.png to be exposed one after another, thus resulting in a flip animation.

Steve

回答2:

Here it is, ready to be implemented in your own webpage http://cnanney.com/journal/code/apple-style-counter-revisited/

回答3:

I've made a counter that works great with very minimal javascript to give it a little "brain":
http://codepen.io/vsync/pen/dlwgj

JADE:

.numCounter(data-value='1839471')
  b
  span ,
  b
  b
  b
  span ,
  b
  b
  b

SCSS:

$digitHeight : 70px;
$speed       : .4s;

.numCounter{ 
  display:inline-block; 
  height:$digitHeight; 
  line-height:$digitHeight; 
  color:#F1F1F1; 
  text-shadow:0 0 2px #fff;
  font-weight:bold; 
  white-space:normal;
  font-size:$digitHeight/1.5;
  > b{
    display:inline-block; 
    width:$digitHeight/1.4; 
    height:100%; 
    margin:0 0.1em;
    border-radius:8px;
    background:#191919; 
    text-align:center;
    box-shadow:1px 1px rgba(white,.05), 1px 1px 5px #111 inset; 
    overflow:hidden;
    &:before{ 
        content:' 0 1 2 3 4 5 6 7 8 9 '; 
        display:block; 
        word-break:break-all;
        word-break:break-word; 
        transition:$speed cubic-bezier(.12,.78,.52,1.2); 
    }
    @for $i from 1 through 9{
        &.d#{$i}:before{ margin-top:-$digitHeight * $i; }
    }
  }
  > span{ 
    display:inline-block; 
    font-size:1.1em; 
    opacity:0.4;
    line-height:1.8; 
    padding:0; 
    vertical-align:top;
    text-shadow:none;
  }
} 

It looks great and performs live very well, and it it count from any number to any number.

回答4:

While searching for the same thing I found a commercial product offering this functionality: Sprite Countdown Flip.

Note: I'm not affiliated with this product; but it's well done and might be useful to someone.

回答5:

I recommend the open source variant: FlipclockJS, which probably was created right after this event :)

Github: objectivehtml/FlipClock, available via NPM and Bower (not maintained)