91 lines
2.1 KiB
JavaScript
91 lines
2.1 KiB
JavaScript
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/*
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* Hide Header on scroll down
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*/
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$(function() {
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const $searchInput = $("#search-input");
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const delta = ScrollHelper.getTopbarHeight();
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let didScroll;
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let lastScrollTop = 0;
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function hasScrolled() {
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let st = $(this).scrollTop();
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/* Make sure they scroll more than delta */
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if (Math.abs(lastScrollTop - st) <= delta) {
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return;
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}
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if (st > lastScrollTop ) { // Scroll Down
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ScrollHelper.hideTopbar();
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if ($searchInput.is(":focus")) {
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$searchInput.blur(); /* remove focus */
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}
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} else { // Scroll up
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// has not yet scrolled to the bottom of the screen, that is, there is still space for scrolling
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if (st + $(window).height() < $(document).height()) {
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if (ScrollHelper.hasScrollUpTask()) {
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return;
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}
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if (ScrollHelper.topbarLocked()) { // avoid redundant scroll up event from smooth scrolling
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ScrollHelper.unlockTopbar();
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} else {
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if (ScrollHelper.orientationLocked()) { // avoid device auto scroll up on orientation change
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ScrollHelper.unLockOrientation();
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} else {
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ScrollHelper.showTopbar();
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}
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}
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}
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}
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lastScrollTop = st;
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} // hasScrolled()
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function handleLandscape() {
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if ($(window).scrollTop() === 0) {
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return;
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}
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ScrollHelper.lockOrientation();
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ScrollHelper.hideTopbar();
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}
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if (screen.orientation) {
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screen.orientation.onchange = () => {
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const type = screen.orientation.type;
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if (type === "landscape-primary" || type === "landscape-secondary") {
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handleLandscape();
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}
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};
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} else {
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// for the browsers that not support `window.screen.orientation` API
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$(window).on("orientationchange",() => {
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if ($(window).width() < $(window).height()) { // before rotating, it is still in portrait mode.
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handleLandscape();
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}
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});
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}
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$(window).scroll(() => {
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if (didScroll) {
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return;
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}
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didScroll = true;
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});
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setInterval(() => {
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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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