74 lines
2.2 KiB
JavaScript
74 lines
2.2 KiB
JavaScript
/* global deepEqual */
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/* exported router */
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'use strict';
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const router = (() => {
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const buffer = [];
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const watchers = [];
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document.addEventListener('DOMContentLoaded', () => update());
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window.addEventListener('popstate', () => update());
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window.addEventListener('hashchange', () => update());
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return {watch, updateSearch, getSearch, updateHash};
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function watch(options, callback) {
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watchers.push({options, callback});
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}
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function updateSearch(key, value) {
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const search = new URLSearchParams(location.search.replace(/^\?/, ''));
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if (!value) {
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search.delete(key);
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} else {
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search.set(key, value);
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}
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const finalSearch = search.toString();
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if (finalSearch) {
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history.replaceState(history.state, null, `?${finalSearch}${location.hash}`);
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} else {
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history.replaceState(history.state, null, `${location.pathname}${location.hash}`);
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}
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update(true);
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}
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function updateHash(hash) {
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if (buffer.length > 1) {
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if (!hash && !buffer[buffer.length - 2].includes('#') || buffer[buffer.length - 2].endsWith(hash)) {
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buffer.pop();
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history.back();
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return;
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}
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}
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if (!hash) {
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hash = ' ';
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}
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history.pushState(history.state, null, hash);
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update();
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}
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function getSearch(key) {
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return new URLSearchParams(location.search.replace(/^\?/, '')).get(key);
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}
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function update(replace) {
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if (!buffer.length || buffer[buffer.length - 1] !== location.href && !replace) {
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buffer.push(location.href);
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} else if (buffer.length && replace) {
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buffer[buffer.length - 1] = location.href;
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}
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for (const {options, callback} of watchers) {
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let state;
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if (options.hash) {
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state = options.hash === location.hash;
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} else if (options.search) {
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// TODO: remove .replace(/^\?/, '') when minimum_chrome_version >= 52 (https://crbug.com/601425)
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const search = new URLSearchParams(location.search.replace(/^\?/, ''));
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state = options.search.map(key => search.get(key));
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}
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if (!deepEqual(state, options.currentState)) {
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options.currentState = state;
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callback(state);
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}
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}
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}
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})();
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