73 lines
1.6 KiB
JavaScript
73 lines
1.6 KiB
JavaScript
/*
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* Hide Header on scroll down
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* v2.0
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* https://github.com/cotes2020/jekyll-theme-chirpy
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* © 2018-2019 Cotes Chung
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* MIT License
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*/
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$(function() {
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const topbarWrapper = $("#topbar-wrapper");
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const toc = $("#toc-wrapper");
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const access = $(".access");
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const searchInput = $("#search-input");
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let didScroll;
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let lastScrollTop = 0;
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const delta = 5;
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const topbarHeight = topbarWrapper.outerHeight();
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function hasScrolled() {
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var st = $(this).scrollTop();
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/* 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) {
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/* Scroll Down */
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topbarWrapper.removeClass("topbar-down").addClass("topbar-up");
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if (toc.length > 0) {
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toc.removeClass("topbar-down");
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}
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if (access.length > 0) {
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access.removeClass("topbar-down");
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}
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if (searchInput.is(":focus")) {
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searchInput.blur(); /* remove focus */
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}
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} else if (st + $(window).height() < $(document).height()) {
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/* Scroll Up */
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topbarWrapper.removeClass("topbar-up").addClass("topbar-down");
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if (toc.length > 0) {
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toc.addClass("topbar-down");
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}
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if (access.length > 0) {
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access.addClass("topbar-down");
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}
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}
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lastScrollTop = st;
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}
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$(window).scroll(function(event) {
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if ($("#topbar-title").is(":hidden")) { /* Not in small screens */
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didScroll = true;
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}
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});
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setInterval(function() {
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if (didScroll) {
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hasScrolled();
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didScroll = false;
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}
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}, 250);
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});
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