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indexstorage

v0.1.3

Published

Alternative localStorage

Downloads

5

Readme

indexStorage

IndexedDBをlocalStorageのように使うためのライブラリです。
IndexedDBは完全に非同期で動作するため、全てのメソッドがPromiseを返します。
なので同期処理が必要な場合はawait呼び出しを使用してください。
インスタンスを生成する時に、パラメータとして

{NODE_ENV: "develop"}

を渡すと、パラメータを渡さなかった場合とは別のデータベースを使用する事が出来ます。

This is a library for using IndexedDB like localStorage.
Since IndexedDB works completely asynchronously, all methods return Promise.
So, if you need synchronous processing, please use await calls.
When creating an instance, the parameter is

{NODE_ENV: "develop"}

you can use a different database than if you had not passed the parameter.

例 example

idx = new indexStorage({NODE_ENV: "develop"});
await idx.setItem("foo", "bar");
ret = await idx.getItem("foo");
console.log(ret); <--- print "bar"

使い方 Usage

リポジトリをクローンし、中の「indexStorage.min.js」もしくは「indexStorage.js」を読み込むと使えます。
You can use it by cloning the repository and loading "indexStorage.min.js" or "indexStorage.js" inside.

ファイル読み込み include file

<script type="text/javascript" src="indexStorage.min.js"></script>


メソッド Method

下記のメソッドを定義してあります。
The following methods have been defined.

  • length
  • key
  • setItem
  • getItem
  • removeItem
  • clear

length

登録されているKeyの総数を返します。
Returns the total number of keys that have been registered.

例 example

idx = new indexStorage();
len = await idx.length();  
console.log(len);

key

指定した番号のKeyを返します。
Keyは追加された順を記憶しており、その番号を指定してKeyを取り出せます。
Keyを削除した場合は順番は詰められます。
指定した番号のKeyが無かった場合は undefined が返ります。

Returns a Key with a specified number.
Keys are stored in the order in which they were added, and you can retrieve a Key by specifying its number.
If a Key is deleted, the order will be packed.
If there is no key with the specified number, undefined will be returned.

例 example

idx = new indexStorage();
key = await idx.key(0);  
console.log(key);

setItem

指定したKeyに、指定した値を保存します。
成功した場合は true が、失敗した場合は false が返ります。

Saves the specified value in the specified Key.
It will return true on success, false on failure.

例 example

idx = new indexStorage();
ret = await idx.setItem("foo", "bar");  
if (ret) {
  console.log("done");
} else {
  console.log("failure");
}

getItem

指定したKeyの値が返ります。
エラーが起きた場合や、存在しないキーを指定場合は undefined が返ります。

Returns the value of the specified Key.
If an error occurs, or if a non-existent key is specified, undefined will be returned.

例 example

idx = new indexStorage();
ret = await idx.getItem("foo");  
console.log(ret);

removeItem

指定したKeyを削除します。
成功した場合は true が、失敗した場合は false が返ります。

Deletes the specified Key. It will return true on success, false on failure.

例 example

idx = new indexStorage();
ret = await idx.removeItem("foo");  
if (ret) {
  console.log("done");
} else {
  console.log("failure");
}

clear

実行したアプリケーションで使用していた、indexStorage用のデータベースを削除します。
独自に作成したIndexedDBのデータベースは削除されません。
成功した場合は true が、失敗した場合は false が返ります。
次にいづれかのメソッドを呼び出した時に、データベースとデータストアは作成されます。

Deletes the database for indexStorage that was used by the executed application.
Databases that were not created by indexStorade will not be deleted.
It will return true on success, false on failure.
The database and data store will be created the next time one of the methods is called.

例 example

idx = new indexStorage();
ret = await idx.clear()  
if (ret) {
  console.log("done");
} else {
  console.log("failure");
}