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leaflet fork for copy edit / bug fixes forked from leaflet.pub/leaflet
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TypeScript
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263// Generated with claude code, sonnet 4.5/** * Scrolls an element into view within a scrolling container using Intersection Observer * and the scrollTo API, instead of the native scrollIntoView. * * @param elementId - The ID of the element to scroll into view * @param scrollContainerId - The ID of the scrolling container (defaults to "pages") * @param threshold - Intersection observer threshold (0-1, defaults to 0.2 for 20%) */export function scrollIntoView( elementId: string, scrollContainerId: string = "pages", threshold: number = 0.9,) { const element = document.getElementById(elementId); const scrollContainer = document.getElementById(scrollContainerId);
if (!element || !scrollContainer) { console.warn(`scrollIntoView: element or container not found`, { elementId, scrollContainerId, element, scrollContainer, }); return; }
// Create an intersection observer to check if element is visible const observer = new IntersectionObserver( (entries) => { const entry = entries[0];
// If element is not sufficiently visible, scroll to it if (!entry.isIntersecting || entry.intersectionRatio < threshold) { const elementRect = element.getBoundingClientRect(); const containerRect = scrollContainer.getBoundingClientRect();
// Calculate the target scroll position // We want to center the element horizontally in the container const targetScrollLeft = scrollContainer.scrollLeft + elementRect.left - containerRect.left - (containerRect.width - elementRect.width) / 2;
scrollContainer.scrollTo({ left: targetScrollLeft, behavior: "smooth", }); }
// Disconnect after checking once observer.disconnect(); }, { root: scrollContainer, threshold: threshold, }, );
observer.observe(element);}