66 lines
1.5 KiB
JavaScript
66 lines
1.5 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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var didScroll;
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var lastScrollTop = 0;
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var delta = 5;
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var topbarHeight = $('#topbar-wrapper').outerHeight();
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$(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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function hasScrolled() {
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var st = $(this).scrollTop();
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// Make sure they scroll more than delta
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if (Math.abs(lastScrollTop - st) <= delta)
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return;
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if (st > lastScrollTop && st > topbarHeight) {
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// Scroll Down
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$('#topbar-wrapper').removeClass('topbar-down').addClass('topbar-up');
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if ( $('#toc-wrapper').length > 0) {
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$('#toc-wrapper').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 ($('#search-input').is(':focus')) {
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$('#search-input').blur(); // remove focus
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}
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} else {
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// Scroll Up
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if (st + $(window).height() < $(document).height()) {
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$('#topbar-wrapper').removeClass('topbar-up').addClass('topbar-down');
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if ( $('#toc-wrapper').length > 0) {
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$('#toc-wrapper').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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}
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lastScrollTop = st;
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}
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}); |