Created
February 24, 2023 11:02
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LocalStorage API powered by Indexeddb
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class LocalStorageAsync { | |
static DatabaseKey = 'LocalStorageAsync.DatabaseKey' | |
static DatabaseStoreKey = 'LocalStorageAsync.DatabaseStoreKey' | |
#hasLoaded | |
constructor() { | |
this.#hasLoaded = new Promise((resolve, reject) => { | |
let dRequest = indexedDB.deleteDatabase(LocalStorageAsync.DatabaseKey) | |
dRequest.onerror = function() { | |
reject(dRequest.error) | |
} | |
let request = indexedDB.open(LocalStorageAsync.DatabaseKey) | |
request.onupgradeneeded = function() { | |
request.result.createObjectStore(LocalStorageAsync.DatabaseStoreKey) | |
resolve() | |
} | |
request.onerror = function() { | |
reject(request.error) | |
} | |
}) | |
} | |
async getItem(key) { | |
await this.#hasLoaded | |
return new Promise((resolve, reject) => { | |
let oRequest = indexedDB.open(LocalStorageAsync.DatabaseKey) | |
oRequest.onsuccess = function() { | |
let db = oRequest.result | |
let tx = db.transaction(LocalStorageAsync.DatabaseStoreKey, 'readonly') | |
let st = tx.objectStore(LocalStorageAsync.DatabaseStoreKey) | |
let gRequest = st.get(key) | |
gRequest.onsuccess = function() { | |
resolve(gRequest.result) | |
} | |
gRequest.onerror = function() { | |
reject(gRequest.error) | |
} | |
} | |
oRequest.onerror = function() { | |
reject(oRequest.error) | |
} | |
}) | |
} | |
async setItem(key, value) { | |
await this.#hasLoaded | |
return new Promise((resolve, reject) => { | |
let oRequest = indexedDB.open(LocalStorageAsync.DatabaseKey) | |
oRequest.onsuccess = function() { | |
let db = oRequest.result | |
let tx = db.transaction(LocalStorageAsync.DatabaseStoreKey, 'readwrite') | |
let st = tx.objectStore(LocalStorageAsync.DatabaseStoreKey) | |
let sRequest = st.put(value, key) | |
sRequest.onsuccess = function() { | |
resolve() | |
} | |
sRequest.onerror = function() { | |
reject(sRequest.error) | |
} | |
} | |
oRequest.onerror = function() { | |
reject(oRequest.error) | |
} | |
}) | |
} | |
async removeItem(key) { | |
await this.#hasLoaded | |
return new Promise((resolve, reject) => { | |
let oRequest = indexedDB.open(LocalStorageAsync.DatabaseKey) | |
oRequest.onsuccess = function() { | |
let db = oRequest.result | |
let tx = db.transaction(LocalStorageAsync.DatabaseStoreKey, 'readwrite') | |
let st = tx.objectStore(LocalStorageAsync.DatabaseStoreKey) | |
let rRequest = st.delete(key) | |
rRequest.onsuccess = function() { | |
resolve() | |
} | |
rRequest.onerror = function() { | |
reject(rRequest.error) | |
} | |
} | |
oRequest.onerror = function() { | |
reject(oRequest.error) | |
} | |
}) | |
} | |
} |
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