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var spy = function () {
var elems = $(":header");
if (elems.length == 0) {
return;
}
var currentTop = $(window).scrollTop();
var currentBottom = $(window).scrollTop() + $(window).height();
var pageBottom = $('#EOF').offset().top;
var meetUnread = false
var currentIndex = -1
elems.each(function (idx) {
var elemTop = $(this).offset().top;
var id = $(this).attr('id');
var navElem = $('#' + id + '-nav');
if (currentTop + $(this).height() >= elemTop || currentBottom >= pageBottom) {
navElem.addClass('toc-active');
} else {
if (meetUnread == false) {
meetUnread = true
currentIndex = idx - 1
}
navElem.removeClass('toc-active');
}
})
}
$().ready(function () {
$(".collapse").each(function (idx) {
$(this).collapse("show");
});
spy();
$(window).bind('scroll', throttle(spy));
});
function throttle(func, timeout = 250) {
let last;
let timer;
return function () {
const context = this;
const args = arguments;
const now = +new Date();
if (last && now < last + timeout) {
clearTimeout(timer)
timer = setTimeout(function () {
last = now
func.apply(context, args)
}, timeout)
} else {
last = now
func.apply(context, args)
}
}
}
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