43 lines
823 B
JavaScript
43 lines
823 B
JavaScript
const VALID_HASH = /^[0-9]{1,2}$/;
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function getHash() {
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const full = window.location.hash;
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return full ? full.substr(1) : '';
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}
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export default class HashSlotNav {
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constructor(changeListener = () => null) {
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this.hash = getHash();
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window.addEventListener('hashchange', () => {
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// Only trigger listener if change wasn't caused by us
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if(getHash() !== this.hash) {
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changeListener();
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}
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});
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}
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getRawHash() {
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return getHash();
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}
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maxSlots() {
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// Capacity of localStorage is limited
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// So avoid allowing too many documents
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// (also acts as a fail-safe if anything gets loop-ey)
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return 100;
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}
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getSlot() {
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const hash = getHash();
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if(VALID_HASH.test(hash)) {
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return Number(hash);
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}
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return null;
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}
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setSlot(v) {
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this.hash = v.toFixed(0);
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window.location.hash = this.hash;
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}
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}
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