| 1 | let offset = 0; |
| 2 | |
| 3 | function update_timer(timer){ |
| 4 | var start = parseInt(timer.dataset.start); |
| 5 | var stop = parseInt(timer.dataset.stop); |
| 6 | var value = parseInt(timer.dataset.value); |
| 7 | var now = Math.floor(Date.now() / 1000) + offset; |
| 8 | |
| 9 | var left = stop - now; |
| 10 | var total = stop - start; |
| 11 | if(left < 0) |
| 12 | left = 0; |
| 13 | |
| 14 | if(value) { |
| 15 | value = Math.max(value * 3 / 10, value * left / total); |
| 16 | timer.innerHTML = Math.floor(value); |
| 17 | } else { |
| 18 | var hours = Math.floor(left / 60 / 60); |
| 19 | hours = hours < 10 ? '0' + hours : hours; |
| 20 | var minutes = Math.floor(left / 60) % 60; |
| 21 | minutes = minutes < 10 ? '0' + minutes : minutes; |
| 22 | var seconds = left % 60; |
| 23 | seconds = seconds < 10 ? '0' + seconds : seconds; |
| 24 | timer.innerHTML = hours + ':' + minutes + ':' + seconds; |
| 25 | } |
| 26 | } |
| 27 | |
| 28 | $(() => { |
| 29 | $('.timer').each(item => { |
| 30 | update_timer(item); |
| 31 | setInterval(() => update_timer(item), 1000); |
| 32 | }); |
| 33 | if($('.timer').length > 0) { |
| 34 | let xhr = new XMLHttpRequest(); |
| 35 | xhr.open('HEAD', '/'); |
| 36 | xhr.onload = () => { |
| 37 | let srvtime = Date.parse(xhr.getResponseHeader('Date')); |
| 38 | offset = Math.ceil((srvtime - Date.now()) / 1000); |
| 39 | console.log("Offset from server: " + offset); |
| 40 | }; |
| 41 | xhr.send(); |
| 42 | } |
| 43 | }); |