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Synchronize cart countdown with server time

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Raphael Michel
2017-11-01 20:46:37 +01:00
parent 2678100149
commit 10103b58f0
3 changed files with 24 additions and 5 deletions
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22
src/pretix/static/pretixpresale/js/ui/cart.js
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@@ -3,6 +3,22 @@ var cart = {
_deadline: null,
_deadline_interval: null,
_deadline_call: 0,
_time_offset: 0,
_get_now: function () {
return moment().add(cart._time_offset, 'ms');
},
_calc_offset: function () {
if (typeof window.performance === "undefined") {
return;
}
var perf = window.performance.timing;
var server_time = Math.round(parseFloat($("body").attr("data-now")) * 1000);
// We use requestStart as we don't know how latency is distributed and we rather want to err on the safe side
var client_time = perf.requestStart;
cart._time_offset = server_time - client_time;
},
draw_deadline: function () {
function pad(n, width, z) {
@@ -16,8 +32,9 @@ var cart = {
// Language files are not loaded yet, don't run during the first seconds
return;
}
var diff_minutes = Math.floor(cart._deadline.diff(moment()) / 1000 / 60);
var diff_seconds = Math.floor(cart._deadline.diff(moment()) / 1000 % 60);
var now = cart._get_now();
var diff_minutes = Math.floor(cart._deadline.diff(now) / 1000 / 60);
var diff_seconds = Math.floor(cart._deadline.diff(now) / 1000 % 60);
if (diff_minutes < 0) {
$("#cart-deadline").text(gettext("The items in your cart are no longer reserved for you."));
$("#cart-deadline-short").text(
@@ -40,6 +57,7 @@ var cart = {
"use strict";
cart._deadline = moment($("#cart-deadline").attr("data-expires"));
cart._deadline_interval = window.setInterval(cart.draw_deadline, 500);
cart._calc_offset();
cart.draw_deadline();
}
};