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June 11, 2022 10:43
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IndexedDB wrapper in TypeScript
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/** | |
* Use IndexedDB for local storage. | |
* Based on https://github.com/DVLP/localStorageDB, but converted to TypeScript and using async instead of callbacks. | |
* @source: https://github.com/DVLP/localStorageDB/blob/master/localdata.js | |
* | |
* Usage example | |
* | |
* | |
```ts | |
const test = async () => { | |
ldb.set('nameGoesHere', 'value goes here'); | |
ldb.set('nameGoesHere2', 'value 2 goes here'); | |
const asyncValue = await ldb.get('nameGoesHere'); | |
console.log('And the async value is', asyncValue); | |
console.log('List of keys', await ldb.list()); | |
console.log('All values', await ldb.getAll()); | |
// Deleting one value | |
await ldb.delete('nameGoesHere'); | |
const asyncValue2 = await ldb.get('nameGoesHere'); | |
console.log('And the async value after delete is', asyncValue2); | |
console.log('All values', await ldb.getAll()); | |
// Clear everything | |
console.log('Storage cleared', await ldb.clear()); | |
console.log('All values', await ldb.getAll()); | |
}; | |
test(); | |
``` | |
*/ | |
(function () { | |
const win = typeof window !== 'undefined' ? window : undefined; | |
if (!win) { | |
console.error('indexedDB cannot get window'); | |
return; | |
} | |
const indexedDB = | |
win.indexedDB || | |
(win as any).mozIndexedDB || | |
(win as any).webkitIndexedDB || | |
(win as any).msIndexedDB; | |
if (typeof window !== 'undefined' && !indexedDB) { | |
console.error('indexDB not supported'); | |
return; | |
} | |
let db: IDBDatabase | null; | |
const request = indexedDB.open('ldb', 1); | |
request.onsuccess = function () { | |
db = this.result; | |
}; | |
request.onerror = (event: Event) => { | |
console.error('indexedDB request error'); | |
console.log(event); | |
}; | |
request.onupgradeneeded = function (event: IDBVersionChangeEvent) { | |
db = null; | |
const store = | |
event && | |
event.target && | |
(event.target as any).result.createObjectStore('s', { | |
keyPath: 'k', | |
}); | |
store.transaction.oncomplete = function (e: Event) { | |
db = (e.target as any).db as IDBDatabase; | |
}; | |
}; | |
const localDb = { | |
get: (key: string) => | |
new Promise<string>((resolve) => { | |
if (!db) { | |
setTimeout(async () => resolve(await localDb.get(key)), 50); | |
return; | |
} | |
db.transaction('s').objectStore('s').get(key).onsuccess = function (event) { | |
const result = | |
((event.target as any).result && (event.target as any).result['v']) || null; | |
resolve(result); | |
}; | |
}), | |
set: (key: string, value: string) => | |
new Promise<void>((resolve) => { | |
if (!db) { | |
setTimeout(async () => resolve(await localDb.set(key, value)), 50); | |
return; | |
} | |
let txn = db.transaction('s', 'readwrite'); | |
txn.oncomplete = () => resolve(); | |
txn.objectStore('s').put({ | |
k: key, | |
v: value, | |
}); | |
txn.commit(); | |
}), | |
delete: (key: string) => | |
new Promise<void>((resolve) => { | |
if (!db) { | |
setTimeout(async () => resolve(await localDb.delete(key)), 50); | |
return; | |
} | |
db.transaction('s', 'readwrite').objectStore('s').delete(key).onsuccess = function () { | |
resolve(); | |
}; | |
}), | |
list: () => | |
new Promise<string[]>((resolve) => { | |
if (!db) { | |
setTimeout(async () => resolve(await localDb.list()), 50); | |
return; | |
} | |
db.transaction('s').objectStore('s').getAllKeys().onsuccess = (event) => { | |
const result = (event.target as any).result || null; | |
resolve(result); | |
}; | |
}), | |
getAll: () => | |
new Promise<Array<{ k: string; v: string }>>((resolve) => { | |
if (!db) { | |
setTimeout(async () => resolve(await localDb.getAll()), 50); | |
return; | |
} | |
db.transaction('s').objectStore('s').getAll().onsuccess = (event) => { | |
const result = ((event.target as any).result as any) || null; | |
resolve(result); | |
}; | |
}), | |
clear: () => | |
new Promise<void>((resolve) => { | |
if (!db) { | |
setTimeout(async () => resolve(await localDb.clear()), 50); | |
return; | |
} | |
db.transaction('s', 'readwrite').objectStore('s').clear().onsuccess = () => { | |
resolve(); | |
}; | |
}), | |
}; | |
ldb = localDb; | |
})(); | |
export let ldb: { | |
get: (key: string) => Promise<string>; | |
// get: (key: string, callback: (result: string) => void) => void; | |
set: (key: string, value: string) => Promise<void>; | |
// set: (key: string, value: string, callback?: () => void) => void; | |
delete: (key: string) => Promise<void>; | |
// delete: (key: string, callback: () => void) => void; | |
list: () => Promise<string[]>; | |
// list: (callback: (listOfKeys: string[]) => void) => void; | |
getAll: () => Promise<Array<{ k: string; v: string }>>; | |
// getAll: (callback: (allEntries: Array<{ k: string; v: string }>) => void) => void; | |
clear: () => Promise<void>; | |
// clear: (callback: () => void) => void; | |
}; |
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