80 lines
2.5 KiB
JavaScript
80 lines
2.5 KiB
JavaScript
/*
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Safari doesn't support CSS `scroll-behavior: smooth`,
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so here is a compatible sollution 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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$(function() {
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$("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 (location.pathname.replace(/^\//, "") === this.pathname.replace(/^\//, "")
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&& location.hostname === this.hostname) {
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const REM = 16; /* 16px */
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const hash = decodeURI(this.hash);
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let isFnRef = RegExp(/^#fnref:/).test(hash);
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let isFn = RegExp(/^#fn:/).test(hash);
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let selector = hash.includes(":") ? hash.replace(/\:/, "\\:") : hash;
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const target = $(selector);
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if (target.length) {
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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 = $(this).offset().top;
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let destOffset = target.offset().top;
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const scrollUp = (destOffset < curOffset);
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const topbarHeight = $("#topbar-wrapper").outerHeight();
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if (scrollUp && isFnRef) {
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/* Avoid the top-bar covering `fnref` when scrolling up
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because `fnref` has no `%anchor`(see: module.scss) style. */
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destOffset -= (topbarHeight + REM / 2);
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}
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$("html,body").animate({
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scrollTop: destOffset
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}, 800, () => {
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var $target = $(target);
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$target.focus();
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const SCROLL_MARK = "scroll-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 (isFn || isFnRef) {
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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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});
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}
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}
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}); /* click() */
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});
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