web/assets/js/_commons/topbar-switch.js

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/*
* Hide Header on scroll down
*/
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$(function() {
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const topbarWrapper = $("#topbar-wrapper");
const toc = $("#toc-wrapper");
const access = $(".access");
const searchInput = $("#search-input");
let didScroll;
let lastScrollTop = 0;
const delta = 5;
const topbarHeight = topbarWrapper.outerHeight();
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function hasScrolled() {
var st = $(this).scrollTop();
/* Make sure they scroll more than delta */
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if (Math.abs(lastScrollTop - st) <= delta) {
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return;
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}
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if (st > lastScrollTop && st > topbarHeight) {
/* Scroll Down */
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topbarWrapper.removeClass("topbar-down").addClass("topbar-up");
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if (toc.length > 0) {
toc.removeClass("topbar-down");
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}
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if (access.length > 0) {
access.removeClass("topbar-down");
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}
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if (searchInput.is(":focus")) {
searchInput.blur(); /* remove focus */
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}
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} else if (st + $(window).height() < $(document).height()) {
/* Scroll Up */
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topbarWrapper.removeClass("topbar-up").addClass("topbar-down");
if (toc.length > 0) {
toc.addClass("topbar-down");
}
if (access.length > 0) {
access.addClass("topbar-down");
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}
}
lastScrollTop = st;
}
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$(window).scroll(function(event) {
if ($("#topbar-title").is(":hidden")) { /* Not in small screens */
didScroll = true;
}
});
setInterval(function() {
if (didScroll) {
hasScrolled();
didScroll = false;
}
}, 250);
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});