44 lines
1.1 KiB
TypeScript
44 lines
1.1 KiB
TypeScript
const havePrefs = typeof window.localStorage !== 'undefined';
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export default class Prefs {
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url: URL;
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title: string;
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constructor() {
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this.url = new URL(window.location.href);
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this.title = window.document.title;
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}
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havePrefs() {
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return havePrefs;
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}
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readPref(name: string): string | null;
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readPref(name: string, defaultValue: string): string;
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readPref(name: string, defaultValue: string | null = null) {
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if (this.url.searchParams.has(name)) {
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return this.url.searchParams.get(name);
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}
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if (havePrefs) {
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return window.localStorage.getItem(name) ?? defaultValue;
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}
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return defaultValue;
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}
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writePref(name: string, value: string) {
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if (this.url.searchParams.has(name)) {
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this.url.searchParams.set(name, value);
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history.replaceState(
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null,
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this.title,
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this.url.toString()
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);
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}
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if (havePrefs) {
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window.localStorage.setItem(name, value);
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}
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}
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}
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