数字翻转计数器

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html

css

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html

css

@import url("https://fonts.googleapis.com/css?family=Fjalla+One&display=swap");
.numCounter {
  display: inline-block;
  height: 90px;
  line-height: 90px;
  text-shadow: 0 0 2px #fff;
  font-weight: bold;
  white-space: normal;
  font-size: 60px;
}
.numCounter > div {
  display: inline-block;
  vertical-align: top;
  height: 100%;
}
.numCounter > div > b {
  display: inline-block;
  width: 64.2857142857px;
  height: 100%;
  margin: 0 .1em;
  border-radius: 8px;
  text-align: center;
  text-shadow: 2px 1px 3px rgba(0, 0, 0, 0.2);
  box-shadow: 2px 2px 3px rgba(0, 0, 0, 0.1) inset, -2px -2px 2px rgba(255, 255, 255, 0.12) inset;
  overflow: hidden;
}
.numCounter > div > b::before {
  content: ' 0 1 2 3 4 5 6 7 8 9 ';
  display: block;
  word-break: break-all;
  word-break: break-word;
  -webkit-transition: 0.5s cubic-bezier(0.75, 0.15, 0.6, 1.15), text-shadow 150ms;
  transition: 0.5s cubic-bezier(0.75, 0.15, 0.6, 1.15), text-shadow 150ms;
}
.numCounter > div > b.blur {
  opacity: .8;
  text-shadow: 2px 1px 3px rgba(0, 0, 0, 0.2), 0 0.1em 2px rgba(255, 255, 255, 0.6), 0 0.3em 3px rgba(255, 255, 255, 0.3), 0 -0.1em 2px rgba(255, 255, 255, 0.6), 0 -0.3em 3px rgba(255, 255, 255, 0.3);
}
.numCounter > div > b[data-value="1"]::before {
  margin-top: -90px;
}
.numCounter > div > b[data-value="2"]::before {
  margin-top: -180px;
}
.numCounter > div > b[data-value="3"]::before {
  margin-top: -270px;
}
.numCounter > div > b[data-value="4"]::before {
  margin-top: -360px;
}
.numCounter > div > b[data-value="5"]::before {
  margin-top: -450px;
}
.numCounter > div > b[data-value="6"]::before {
  margin-top: -540px;
}
.numCounter > div > b[data-value="7"]::before {
  margin-top: -630px;
}
.numCounter > div > b[data-value="8"]::before {
  margin-top: -720px;
}
.numCounter > div > b[data-value="9"]::before {
  margin-top: -810px;
}
.numCounter > div:nth-last-child(3n):not(:first-child)::before {
  content: ",";
  display: inline;
  font-size: 1.1em;
  opacity: .6;
  color: white;
}

html, body {
  height: 100%;
}

body {
  display: -webkit-box;
  display: flex;
  -webkit-box-align: center;
          align-items: center;
  -webkit-box-pack: center;
          justify-content: center;
  background: #55b9f3;
  font-family: 'Fjalla One', Arial;
  -webkit-perspective: 1000px;
          perspective: 1000px;
}

aside {
  background: white;
  position: absolute;
  left: 0;
  top: 0;
  border-bottom-right-radius: 16px;
  overflow: hidden;
}

fieldset {
  text-transform: capitalize;
  font-weight: 700;
  font-size: .9em;
  border: 0;
  padding: 0;
  color: #0a5c8c;
}
fieldset label {
  padding: .8em;
  display: -webkit-box;
  display: flex;
  -webkit-box-align: center;
          align-items: center;
  height: 18px;
  border-top: 1px solid #55b9f3;
}
fieldset label:hover {
  background: #e4f4fd;
}
fieldset label > span {
  width: 180px;
  padding-right: 1em;
}

.numCounter {
  overflow: hidden;
  padding: .4em;
  text-align: center;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  border-left: 0.5px solid rgba(255, 255, 255, 0.01);
  border-radius: 16px;
  background: linear-gradient(330deg, #6fc4f6, #3ea2dc);
  box-shadow: -20px -20px 60px #308fc6, 20px 20px 60px #7dcbf9;
}
.numCounter b {
  background: #40aae8;
  background: linear-gradient(-30deg, #62bff5, #2f99d7);
  color: white;
}

JavaScript

function Counter(selector, settings){
  this.settings = Object.assign({
    digits: 5,
    delay: 250, // ms
    direction: ''  // ltr is default
  }, settings || {})
  
  this.DOM = {}
  this.build(selector)
  
  this.DOM.scope.addEventListener('transitionend', e => {
    if (e.pseudoElement === "::before" && e.propertyName == 'margin-top'){
      e.target.classList.remove('blur')
    }
  })
  
  this.count()
}

Counter.prototype = { 
  // generate digits markup
  build( selector ){
      var scopeElm = typeof selector == 'string' 
            ? document.querySelector(selector) 
            : selector;
      
      scopeElm.innerHTML = Array(this.settings.digits + 1)
          .join('<div><b data-value="0"></b></div>');
    
      this.DOM = {
        scope : scopeElm,
        digits : scopeElm.querySelectorAll('b')
      }
  },
  
  count( newVal ){
    var countTo, className, 
        settings = this.settings,
        digitsElms = this.DOM.digits;

// update instance's value
    this.value = newVal || this.DOM.scope.dataset.value|0

if( !this.value ) return;

// convert value into an array of numbers
    countTo = (this.value+'').split('')

if( settings.direction == 'rtl' ){
      countTo = countTo.reverse()
      digitsElms = [].slice.call(digitsElms).reverse()
    }

// loop on each number element and change it
    digitsElms.forEach(function(item, i){ 
        if( +item.dataset.value != countTo[i]  &&  countTo[i] >= 0 )
          setTimeout(function(j){
              var diff = Math.abs(countTo[j] - +item.dataset.value);
              item.dataset.value = countTo[j]
              if( diff > 3 )
                item.className = 'blur';
          }, i * settings.delay, i)
    })
  }
}

/////////////// create new counter for this demo ///////////////////////

var numberOfDigitsInputElm = document.querySelector('input[name=numberOfDigits]');
var delayInputElm = document.querySelector('input[name=delay]');
var animationDirectionElm = document.querySelector('input[name=animationDirection]');

var numberOfDigits = +numberOfDigitsInputElm.value;
var counter = new Counter('.numCounter', {
  direction : 'rtl', 
  delay     : delayInputElm.value, 
  digits    : numberOfDigits
})

// change counter value every N seconds
var counterInterval = setInterval(randomCount, 3000)

function randomCount(){
  counter.count(  +(""+Math.random()).substring(2, 2+numberOfDigits)  )
}

function getRandomNum(min,max){
    return Math.floor(Math.random()*(max-min+1) + min)
}

/////////////// Controls ///////////////////////

numberOfDigitsInputElm.addEventListener('change', onLengthChange)
delayInputElm.addEventListener('change', onDelayChange)
animationDirectionElm.addEventListener('change', onAnimationDirectionElmChange)

// controls' callbacks
function onLengthChange(e){
  clearInterval(counterInterval)
  numberOfDigits = +e.target.value;
  counter.settings.digits = numberOfDigits;
  counter.build()
  counterInterval = setInterval(randomCount, 3000)
  randomCount()
}

function onDelayChange(e){
  counter.settings.delay = +e.target.value
}

function onAnimationDirectionElmChange(e){
  counter.settings.direction = e.target.checked ? "rtl" : ""
}

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