39 lines
1.7 KiB
JavaScript
39 lines
1.7 KiB
JavaScript
import zenscroll from "https://esm.sh/zenscroll@4.0.2";
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var FIXED_BUFFER = 0; // breathing room below fixed header when menu is closed
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// Returns the effective scroll offset to clear the header.
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// When the hamburger is open, offsetHeight already includes the expanded nav,
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// so no extra buffer is needed. When closed, add FIXED_BUFFER for breathing room.
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function headerOffset() {
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var header = document.querySelector(".rpt-header");
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if (!header) return 0;
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var pos = window.getComputedStyle(header).position;
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if (pos !== "fixed" && pos !== "sticky") return 0;
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var nav = document.getElementById("rpt-main-nav");
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var menuOpen = nav && nav.classList.contains("is-open");
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return header.offsetHeight + (menuOpen ? 0 : FIXED_BUFFER);
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}
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// On load: scroll to the anchor from either the URL hash or drupalSettings
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// (set by the server when rendering the home page at a clean URL like /services).
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document.addEventListener("DOMContentLoaded", function () {
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var settings = window.drupalSettings && window.drupalSettings.riversidePt;
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var anchor = window.location.hash || (settings && settings.scrollTo);
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if (!anchor) return;
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var target = document.querySelector(anchor);
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if (!target) return;
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requestAnimationFrame(function () {
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zenscroll.toY(Math.max(0, target.getBoundingClientRect().top + window.scrollY - headerOffset()), 0);
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});
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});
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document.addEventListener("click", function (e) {
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var link = e.target.closest("[data-scroll-to]");
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if (!link) return;
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var target = document.querySelector(link.dataset.scrollTo);
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if (!target) return;
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e.preventDefault();
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history.pushState({}, "", link.getAttribute("href"));
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zenscroll.toY(Math.max(0, target.getBoundingClientRect().top + window.scrollY - headerOffset()), 400);
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});
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