mirror of
https://github.com/kevin-DL/sapper.git
synced 2026-01-12 03:05:12 +00:00
169 lines
4.2 KiB
JavaScript
169 lines
4.2 KiB
JavaScript
const detach = node => {
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node.parentNode.removeChild(node);
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};
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let component;
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const scroll_history = {};
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let uid = 1;
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let cid;
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window.scroll_history = scroll_history;
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if ('scrollRestoration' in history) {
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history.scrollRestoration = 'manual'
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}
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const app = {
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init(target, routes) {
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function select_route(url) {
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if (url.origin !== window.location.origin) return null;
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for (const route of routes) {
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const match = route.pattern.exec(url.pathname);
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if (match) {
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const params = route.params(match);
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const query = {};
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for (const [key, value] of url.searchParams) query[key] = value || true;
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return { route, data: { params, query } };
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}
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}
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}
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function render(Component, data, scroll) {
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Promise.resolve(
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Component.preload ? Component.preload(data) : {}
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).then(preloaded => {
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if (component) {
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component.destroy();
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} else {
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// first load — remove SSR'd <head> contents
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const start = document.querySelector('#sapper-head-start');
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let end = document.querySelector('#sapper-head-end');
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if (start && end) {
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while (start.nextSibling !== end) detach(start.nextSibling);
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detach(start);
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detach(end);
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}
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// preload additional routes
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routes.reduce((promise, route) => promise.then(route.load), Promise.resolve());
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}
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component = new Component({
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target,
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data: Object.assign(data, preloaded),
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hydrate: !!component
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});
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window.scrollTo(scroll.x, scroll.y);
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});
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}
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function navigate(url, id) {
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const selected = select_route(url);
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if (selected) {
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if (id) {
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// popstate or initial navigation
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cid = id;
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} else {
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// clicked on a link. preserve scroll state
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scroll_history[cid] = scroll_state();
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id = cid = ++uid;
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scroll_history[cid] = { x: 0, y: 0 };
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history.pushState({ id }, '', url.href);
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event.preventDefault();
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}
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selected.route.load().then(mod => {
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render(mod.default, selected.data, scroll_history[id]);
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});
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cid = id;
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return true;
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}
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}
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function findAnchor(node) {
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while (node && node.nodeName.toUpperCase() !== 'A') node = node.parentNode; // SVG <a> elements have a lowercase name
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return node;
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}
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window.addEventListener('click', event => {
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// Adapted from https://github.com/visionmedia/page.js
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// MIT license https://github.com/visionmedia/page.js#license
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if (which(event) !== 1) return;
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if (event.metaKey || event.ctrlKey || event.shiftKey) return;
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if (event.defaultPrevented) return;
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const a = findAnchor(event.target);
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if (!a) return;
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event.preventDefault();
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// check if link is inside an svg
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// in this case, both href and target are always inside an object
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const svg = typeof a.href === 'object' && a.href.constructor.name === 'SVGAnimatedString';
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const href = svg ? a.href.baseVal : a.href;
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// Ignore if tag has
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// 1. 'download' attribute
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// 2. rel='external' attribute
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if (a.hasAttribute('download') || a.getAttribute('rel') === 'external') return;
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// Ignore if <a> has a target
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if (svg ? a.target.baseVal : a.target) return;
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const scroll = scroll_state();
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navigate(new URL(a.href), null);
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});
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function preload(event) {
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const a = findAnchor(event.target);
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if (!a || a.rel !== 'prefetch') return;
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const selected = select_route(new URL(a.href));
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if (selected) {
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selected.route.load().then(mod => {
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if (mod.default.preload) mod.default.preload(selected.data);
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});
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}
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}
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window.addEventListener('touchstart', preload);
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window.addEventListener('mouseover', preload);
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window.addEventListener('popstate', event => {
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if (!event.state) return; // hashchange, or otherwise outside sapper's control
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scroll_history[cid] = scroll_state();
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navigate(new URL(window.location), event.state.id);
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});
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const scroll = scroll_history[uid] = scroll_state();
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history.replaceState({ id: uid }, '', window.location.href);
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navigate(new URL(window.location), uid);
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}
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};
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function which(event) {
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event = event || window.event;
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return event.which === null ? event.button : event.which;
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}
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function scroll_state() {
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return {
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x: window.scrollX,
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y: window.scrollY
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};
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}
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export default app; |