web/_javascript/commons/topbar-switch.js
2021-04-20 04:22:28 +08:00

69 lines
1.5 KiB
JavaScript

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