mirror of
https://github.com/koalyptus/TableFilter.git
synced 2024-05-05 16:13:34 +02:00
101 lines
2.4 KiB
JavaScript
101 lines
2.4 KiB
JavaScript
import Event from '../event';
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import {root} from '../root';
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const JSON = root.JSON;
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const location = root.location;
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const decodeURIComponent = root.decodeURIComponent;
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export const hasHashChange = () => {
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var docMode = root.documentMode;
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return ('onhashchange' in root) && (docMode === undefined || docMode > 7);
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};
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/**
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* Manages the URL hash reflecting the features state to be persisted
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*
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* @export
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* @class Hash
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*/
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export class Hash {
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/**
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* Creates an instance of Hash
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*
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* @param {State} state Instance of State
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*/
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constructor(state) {
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this.state = state;
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this.lastHash = null;
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this.emitter = state.emitter;
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}
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/**
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* Initializes the Hash object
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*/
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init() {
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if (!hasHashChange()) {
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return;
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}
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this.lastHash = location.hash;
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this.emitter.on(['state-changed'], (tf, state) => this.update(state));
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this.emitter.on(['initialized'], () => this.sync());
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Event.add(root, 'hashchange', () => this.sync());
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}
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/**
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* Updates the URL hash based on a state change
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*
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* @param {State} state Instance of State
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*/
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update(state) {
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let hash = `#${JSON.stringify(state)}`;
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if (this.lastHash === hash) {
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return;
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}
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location.hash = hash;
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this.lastHash = hash;
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}
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/**
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* Converts a URL hash into a state JSON object
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*
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* @param {String} hash URL hash fragment
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* @returns {Object} JSON object
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*/
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parse(hash) {
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if (hash.indexOf('#') === -1) {
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return null;
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}
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hash = hash.substr(1);
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return JSON.parse(decodeURIComponent(hash));
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}
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/**
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* Applies current hash state to features
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*/
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sync() {
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let state = this.parse(location.hash);
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if (!state) {
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return;
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}
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// override current state with persisted one and sync features
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this.state.overrideAndSync(state);
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}
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/**
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* Release Hash event subscriptions and clear fields
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*/
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destroy() {
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this.emitter.off(['state-changed'], (tf, state) => this.update(state));
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this.emitter.off(['initialized'], () => this.sync());
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Event.remove(root, 'hashchange', () => this.sync());
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this.state = null;
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this.lastHash = null;
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this.emitter = null;
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}
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}
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