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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 = elems.length - 1
elems.each(function (idx) {
var elemTop = $(this).offset().top;
var id = $(this).attr('id');
var navElem = $('#' + id + '-nav');
if (currentTop + $(this).height() >= elemTop) {
navElem.addClass('toc-active');
} else {
if (meetUnread == false) {
meetUnread = true
currentIndex = idx - 1
}
navElem.removeClass('toc-active');
}
})
if (currentBottom >= pageBottom) {
currentIndex = -1
}
//console.log(currentIndex);
//Collapse them
collapseOthers(currentIndex);
}
var onNavClick = function () {
spy()
}
var collapseOthers = function (currentIndex) {
if (currentIndex == -1) {
$(".collapse").each(function (idx) {
$(this).collapse("hide");
});
return;
}
var elems = $(":header");
//console.log(currentIndex);
currentId = "#" + elems[currentIndex].id + "-nav";
$(currentId).parents(".collapse").each(function (idx) {
$(this).collapse("show");
});
$(currentId).parent().next().filter(".collapse").collapse("show");
$(".collapse").not($(currentId).parents()).not($(currentId).parent().next()).each(function (idx) {
$(this).collapse("hide");
});
}
//From https://github.com/lodash/lodash/blob/master/debounce.js
// and https://github.com/lodash/lodash/blob/master/isObject.js
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