Created
April 8, 2022 06:57
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counter up to big int
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| <script> | |
| ;window.addEventListener('load', () => { | |
| /// пример <span data-count-from='0' data-count-to='8000000' data-count-duration='2000'>8.000.000</span> | |
| function onceVisible(el, callback) { | |
| new IntersectionObserver((entries, observer) => { | |
| entries.forEach(entry => { | |
| if (entry.isIntersecting) { | |
| callback(el, entry, observer) | |
| observer.disconnect() | |
| } | |
| }) | |
| }).observe(el) | |
| } | |
| const randInt = max => Math.floor(Math.random() * max) | |
| const formatInt = num => { | |
| num = parseInt(num).toString() | |
| let s = -3 | |
| let e = 0 | |
| const parts = [] | |
| let part = num.slice(s, e || undefined) | |
| while (part) { | |
| parts.push(part) | |
| s -= 3 | |
| e -= 3 | |
| part = num.slice(s, e || undefined) | |
| } | |
| return parts.reverse().join('.') | |
| } | |
| function runCounter(el) { | |
| const to = parseInt(el.dataset.countTo) | |
| const from = parseInt(el.dataset.countFrom || 0) | |
| const duration = parseInt(el.dataset.countDuration || 2000) | |
| el.textContent = from | |
| const start = Date.now() | |
| const dist = to - from | |
| const frame = () => { | |
| const delta = Date.now() - start | |
| let val = parseInt(from + dist * (delta / duration)) | |
| if (val < to) { | |
| if (val > 1000) | |
| val = parseInt(val/1000)*1000 + randInt(1000) | |
| el.textContent = formatInt(val) | |
| window.requestAnimationFrame(frame) | |
| } else { | |
| el.textContent = formatInt(to) | |
| } | |
| } | |
| window.requestAnimationFrame(frame) | |
| } | |
| document.querySelectorAll('[data-count-to]').forEach(el => onceVisible(el, runCounter)) | |
| }); | |
| </script> |
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