70 lines
1.8 KiB
JavaScript
70 lines
1.8 KiB
JavaScript
/*
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* Hide Header on scroll down
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*/
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$(function() {
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const $topbarWrapper = $("#topbar-wrapper");
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const $topbarTitle = $("#topbar-title");
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const $panel = $("#panel-wrapper");
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const $searchInput = $("#search-input");
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const CLASS_TOPBAR_UP = "topbar-up";
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const CLASS_TOPBAR_DOWN = "topbar-down";
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const ATTR_TOC_SCROLLING_UP = "toc-scrolling-up"; // topbar locked
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let didScroll;
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let lastScrollTop = 0;
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const delta = $topbarWrapper.outerHeight();
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const topbarHeight = $topbarWrapper.outerHeight();
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function hasScrolled() {
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let st = $(this).scrollTop();
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/* Make sure they scroll more than delta */
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if (Math.abs(lastScrollTop - st) <= delta) {
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return;
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}
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if (st > lastScrollTop ) { // Scroll Down
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if (st > topbarHeight) {
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$topbarWrapper.removeClass(CLASS_TOPBAR_DOWN).addClass(CLASS_TOPBAR_UP);
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$panel.removeClass(CLASS_TOPBAR_DOWN);
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if ($searchInput.is(":focus")) {
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$searchInput.blur(); /* remove focus */
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}
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}
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} else {// Scroll up
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// did not reach the bottom of the document, i.e., still have space to scroll up
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if (st + $(window).height() < $(document).height()) {
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let tocScrollingUp = $topbarWrapper.attr(ATTR_TOC_SCROLLING_UP);
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if (typeof tocScrollingUp !== "undefined") {
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if (tocScrollingUp === "false") {
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$topbarWrapper.removeAttr(ATTR_TOC_SCROLLING_UP);
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}
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} else {
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$topbarWrapper.removeClass(CLASS_TOPBAR_UP).addClass(CLASS_TOPBAR_DOWN);
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$panel.addClass(CLASS_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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$(window).scroll(function(event) {
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if ($topbarTitle.is(":hidden")) {
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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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