forked from mystiq/hydrogen-web
60 lines
1.6 KiB
JavaScript
60 lines
1.6 KiB
JavaScript
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/*
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Copyright 2020 Bruno Windels <bruno@windels.cloud>
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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import {BaseObservableValue} from "../../../observable/ObservableValue.js";
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export class HashObservable extends BaseObservableValue {
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constructor() {
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super();
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this._boundOnHashChange = null;
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this._expectSetEcho = false;
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}
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_onHashChange() {
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if (this._expectSetEcho) {
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this._expectSetEcho = false;
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return;
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}
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this.emit(this.get());
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}
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get() {
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const hash = document.location.hash;
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if (hash.length) {
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// trim '#'
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return hash.substr(1);
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}
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return hash;
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}
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set(hash) {
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if (this._boundOnHashChange) {
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this._expectSetEcho = true;
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}
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document.location.hash = hash;
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}
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onSubscribeFirst() {
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this._boundOnHashChange = this._onHashChange.bind(this);
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window.addEventListener('hashchange', this._boundOnHashChange);
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}
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onUnsubscribeLast() {
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window.removeEventListener('hashchange', this._boundOnHashChange);
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this._boundOnHashChange = null;
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}
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}
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