102 lines
3.6 KiB
JavaScript
102 lines
3.6 KiB
JavaScript
/*
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Safari doesn't support CSS `scroll-behavior: smooth`,
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so here is a compatible solution for all browser to smooth scrolling
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See: <https://css-tricks.com/snippets/jquery/smooth-scrolling/>
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Warning: It must be called after all `<a>` tags (e.g., the dynamic TOC) are ready.
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*/
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$(function() {
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const $topbarWrapper = $("#topbar-wrapper");
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const topbarHeight = $topbarWrapper.outerHeight();
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const $topbarTitle = $("#topbar-title");
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const ATTR_TOC_SCROLLING = "toc-scrolling-up";
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const SCROLL_MARK = "scroll-focus";
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const REM = 16; // in pixels
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let tocScrollUpCount = 0;
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$("a[href*='#']")
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.not("[href='#']")
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.not("[href='#0']")
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.click(function(event) {
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if (this.pathname.replace(/^\//, "") === location.pathname.replace(/^\//, "")) {
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if (location.hostname === this.hostname) {
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const hash = decodeURI(this.hash);
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let toFootnoteRef = RegExp(/^#fnref:/).test(hash);
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let toFootnote = toFootnoteRef? false : RegExp(/^#fn:/).test(hash);
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let selector = hash.includes(":") ? hash.replace(/\:/g, "\\:") : hash;
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let $target = $(selector);
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let parent = $(this).parent().prop("tagName");
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let isAnchor = RegExp(/^H\d/).test(parent);
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let isMobileViews = !$topbarTitle.is(":hidden");
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if (typeof $target !== "undefined") {
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event.preventDefault();
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if (history.pushState) { /* add hash to URL */
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history.pushState(null, null, hash);
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}
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let curOffset = isAnchor? $(this).offset().top : $(window).scrollTop();
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let destOffset = $target.offset().top -= REM / 2;
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if (destOffset < curOffset) { // scroll up
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if (!isAnchor && !toFootnote) { // trigger by ToC item
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if (!isMobileViews) { // on desktop/tablet screens
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$topbarWrapper.removeClass("topbar-down").addClass("topbar-up");
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// Send message to `${JS_ROOT}/commons/topbar-switch.js`
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$topbarWrapper.attr(ATTR_TOC_SCROLLING, true);
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tocScrollUpCount += 1;
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}
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}
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if ((isAnchor || toFootnoteRef) && isMobileViews) {
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destOffset -= topbarHeight;
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console.log(`[smooth] mobile -= topbar height`);
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}
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}
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$("html").animate({
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scrollTop: destOffset
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}, 500, () => {
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$target.focus();
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/* clean up old scroll mark */
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if ($(`[${SCROLL_MARK}=true]`).length) {
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$(`[${SCROLL_MARK}=true]`).attr(SCROLL_MARK, false);
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}
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/* Clean :target links */
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if ($(":target").length) { /* element that visited by the URL with hash */
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$(":target").attr(SCROLL_MARK, false);
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}
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/* set scroll mark to footnotes */
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if (toFootnote || toFootnoteRef) {
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$target.attr(SCROLL_MARK, true);
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}
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if ($target.is(":focus")) { /* Checking if the target was focused */
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return false;
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} else {
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$target.attr("tabindex", "-1"); /* Adding tabindex for elements not focusable */
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$target.focus(); /* Set focus again */
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}
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if (typeof $topbarWrapper.attr(ATTR_TOC_SCROLLING) !== "undefined") {
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tocScrollUpCount -= 1;
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if (tocScrollUpCount <= 0) {
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$topbarWrapper.attr(ATTR_TOC_SCROLLING, "false");
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}
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}
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});
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}
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}
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}
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}); /* click() */
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});
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