77 lines
2.5 KiB
JavaScript
77 lines
2.5 KiB
JavaScript
function createMobileReviewDetailNavigation(options) {
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const buttons = options.buttons || {};
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const targets = options.targets || {};
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const listeners = new Map();
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const prefersReducedMotion = options.prefersReducedMotion || (() => false);
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const targetNames = new Map(Object.entries(targets).map(([name, target]) => [target, name]));
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let observer = null;
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function select(name) {
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Object.entries(buttons).forEach(([key, button]) => {
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if (!button) return;
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if (key === name) button.setAttribute('aria-current', 'location');
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else button.removeAttribute('aria-current');
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});
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}
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function navigate(name) {
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const target = targets[name];
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if (!target) return false;
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target.scrollIntoView({
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block:'start',
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behavior:prefersReducedMotion() ? 'auto' : 'smooth',
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});
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if (name === 'feedback' && options.summaryComposer) {
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options.summaryComposer.focus({ preventScroll:true });
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}
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select(name);
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return true;
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}
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function reset() {
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select('overview');
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}
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return {
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start() {
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Object.entries(buttons).forEach(([name, button]) => {
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if (!button || listeners.has(button)) return;
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const listener = event => {
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event.preventDefault();
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navigate(name);
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};
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listeners.set(button, listener);
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button.addEventListener('click', listener);
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});
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reset();
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const observe = options.observe || ((handler, observedTargets, root) => {
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if (typeof IntersectionObserver === 'undefined') return null;
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const instance = new IntersectionObserver(handler, {
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root:root || null,
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rootMargin:'-20% 0px -60% 0px',
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threshold:[0, 0.25, 0.5, 0.75, 1],
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});
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observedTargets.forEach(target => instance.observe(target));
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return instance;
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});
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observer = observe(entries => {
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const visible = entries
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.filter(entry => entry.isIntersecting && targetNames.has(entry.target))
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.sort((left, right) => right.intersectionRatio - left.intersectionRatio)[0];
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if (visible) select(targetNames.get(visible.target));
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}, Array.from(targetNames.keys()).filter(Boolean), options.root || null);
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},
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stop() {
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listeners.forEach((listener, button) => button.removeEventListener('click', listener));
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listeners.clear();
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if (observer) observer.disconnect();
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observer = null;
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},
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navigate,
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reset,
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select,
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};
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}
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if (typeof module !== 'undefined') module.exports = createMobileReviewDetailNavigation;
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