| 1 | let offset = 0; |
| 2 | |
| 3 | function update_timer(timer){ |
| 4 | const start = parseInt(timer.dataset.start); |
| 5 | const stop = parseInt(timer.dataset.stop); |
| 6 | const value = parseInt(timer.dataset.value); |
| 7 | const now = Math.floor(Date.now() / 1000) + offset; |
| 8 | |
| 9 | const left = Math.max(stop - now, 0); |
| 10 | const total = stop - start; |
| 11 | |
| 12 | if(value) |
| 13 | timer.innerHTML = Math.floor(Math.max(value * 3 / 10, value * left / total)); |
| 14 | else { |
| 15 | let hours = Math.floor(left / 60 / 60); |
| 16 | hours = hours < 10 ? '0' + hours : hours; |
| 17 | let minutes = Math.floor(left / 60) % 60; |
| 18 | minutes = minutes < 10 ? '0' + minutes : minutes; |
| 19 | let seconds = left % 60; |
| 20 | seconds = seconds < 10 ? '0' + seconds : seconds; |
| 21 | timer.innerHTML = hours + ':' + minutes + ':' + seconds; |
| 22 | } |
| 23 | } |
| 24 | |
| 25 | $(() => { |
| 26 | $('.timer').each(item => { |
| 27 | update_timer(item); |
| 28 | setInterval(() => update_timer(item), 1000); |
| 29 | }); |
| 30 | if($('.timer').length > 0) { |
| 31 | const xhr = new XMLHttpRequest(); |
| 32 | xhr.open('HEAD', '/'); |
| 33 | xhr.onload = () => { |
| 34 | const srvtime = Date.parse(xhr.getResponseHeader('Date')); |
| 35 | offset = Math.ceil((srvtime - Date.now()) / 1000); |
| 36 | console.log("Offset from server: " + offset); |
| 37 | }; |
| 38 | xhr.send(); |
| 39 | } |
| 40 | }); |