95 lines
2.5 KiB
JavaScript
95 lines
2.5 KiB
JavaScript
'use strict';
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define(require => {
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const {msg} = require('/js/msg');
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const {deepEqual} = require('/js/toolbox');
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const buffer = [];
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const watchers = [];
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document.on('DOMContentLoaded', () => update());
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window.on('popstate', () => update());
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window.on('hashchange', () => update());
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msg.on(e => {
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if (e.method === 'pushState' && e.url !== location.href) {
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history.pushState(history.state, null, e.url);
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update();
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return true;
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}
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});
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return {
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update,
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getSearch(key) {
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return new URLSearchParams(location.search).get(key);
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},
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updateHash(hash) {
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/* hash: String
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Send an empty string to remove the hash.
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*/
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if (buffer.length > 1) {
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if (!hash && !buffer[buffer.length - 2].includes('#') ||
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hash && buffer[buffer.length - 2].endsWith(hash)) {
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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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updateSearch(key, value) {
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const u = new URL(location);
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u.searchParams[value ? 'set' : 'delete'](key, value);
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history.replaceState(history.state, null, `${u}`);
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update(true);
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},
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watch(options, callback) {
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/* Watch search params or hash and get notified on change.
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options: {search?: Array<key: String>, hash?: String}
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callback: (Array<value: String | null> | Boolean) => void
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`hash` should always start with '#'.
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When watching search params, callback receives a list of values.
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When watching hash, callback receives a boolean.
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*/
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watchers.push({options, callback});
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},
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};
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function update(replace) {
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if (!buffer.length) {
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buffer.push(location.href);
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} else if (buffer[buffer.length - 1] === location.href) {
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return;
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} else if (replace) {
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buffer[buffer.length - 1] = location.href;
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} else if (buffer.length > 1 && buffer[buffer.length - 2] === location.href) {
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buffer.pop();
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} else {
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buffer.push(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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const search = new URLSearchParams(location.search);
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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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