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59 lines
2.4 KiB
59 lines
2.4 KiB
import {safeJsonParse} from 'app/common/gutil';
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import {Observable} from 'grainjs';
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import {getSessionStorage, getStorage} from 'app/client/lib/storage';
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function getStorageBoolObs(store: Storage, key: string, defValue: boolean) {
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const storedNegation = defValue ? 'false' : 'true';
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const obs = Observable.create(null, store.getItem(key) === storedNegation ? !defValue : defValue);
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obs.addListener((val) => val === defValue ? store.removeItem(key) : store.setItem(key, storedNegation));
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return obs;
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}
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/**
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* Helper to create a boolean observable whose state is stored in localStorage.
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*
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* Optionally, a default value of true will make the observable start off as true. Note that the
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* same default value should be used for an observable every time it's created.
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*/
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export function localStorageBoolObs(key: string, defValue = false): Observable<boolean> {
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return getStorageBoolObs(getStorage(), key, defValue);
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}
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/**
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* Similar to `localStorageBoolObs`, but always uses sessionStorage (or an in-memory equivalent).
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*/
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export function sessionStorageBoolObs(key: string, defValue = false): Observable<boolean> {
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return getStorageBoolObs(getSessionStorage(), key, defValue);
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}
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function getStorageObs(store: Storage, key: string, defaultValue?: string) {
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const obs = Observable.create<string|null>(null, store.getItem(key) ?? defaultValue ?? null);
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obs.addListener((val) => (val === null) ? store.removeItem(key) : store.setItem(key, val));
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return obs;
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}
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/**
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* Helper to create a string observable whose state is stored in localStorage.
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*/
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export function localStorageObs(key: string, defaultValue?: string): Observable<string|null> {
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return getStorageObs(getStorage(), key, defaultValue);
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}
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/**
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* Similar to `localStorageObs`, but always uses sessionStorage (or an in-memory equivalent).
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*/
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export function sessionStorageObs(key: string, defaultValue?: string): Observable<string|null> {
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return getStorageObs(getSessionStorage(), key, defaultValue);
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}
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/**
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* Helper to create a JSON observable whose state is stored in localStorage.
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*/
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export function localStorageJsonObs<T>(key: string, defaultValue: T): Observable<T> {
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const store = getStorage();
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const currentValue = safeJsonParse(store.getItem(key) || '', defaultValue ?? null);
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const obs = Observable.create<T>(null, currentValue);
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obs.addListener((val) => (val === null) ? store.removeItem(key) : store.setItem(key, JSON.stringify(val ?? null)));
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return obs;
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}
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