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{% extends "base.html" %}
{% block script %}
const STATE_BACK = "back";
const STATE_FORWARD = "forward";
function switch_state(new_state) {
history.replaceState(
new_state,
document.title,
location.pathname + location.hash);
}
function go_back() {
switch_state(STATE_FORWARD);
history.back();
}
function go_forward() {
switch_state(STATE_BACK);
history.forward();
}
function prepare_restore() {
if (!document.hidden) {
go_back();
return;
}
document.addEventListener("visibilitychange", go_back, {once: true});
}
// there are three states
// default: register focus listener,
// on focus: go back and switch to the state forward
// back: user came from a later history entry
// -> switch to the state forward,
// forward him to the previous history entry
// forward: user came from a previous history entry
// -> switch to the state back,
// forward him to the next history entry
switch (history.state) {
case STATE_BACK:
go_back();
break;
case STATE_FORWARD:
go_forward();
break;
default:
setTimeout(prepare_restore, 1000);
break;
}
{% endblock %}
{% block content %}
<noscript><p>Javascript isn't enabled. So you need to manually go back in history to restore this tab.</p></noscript>
<p>Loading suspended page...<br>
<br>
If nothing happens, something went wrong or you disabled JavaScript.</p>
{% endblock %}
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