released 1.0.4

add storage supported check
new cache only mode

Author: acathur

README.md

@@ -49,7 +49,7 @@ Or add the script to your main HTML file
 
 ```js
 const db = new StorageDB({
-    storage: window.localStorage,     // storage object, default is window.localStorage
+    storage: window.localStorage,     // storage object, default is window.localStorage. If you want to store data in memory only, you can set it null
     database: 'testdb',               // database name, default is 'db'
     primaryKey: 'id'                  // primary key of collection, default is '_id'
 })

lib/storagedb.js

@@ -1,6 +1,6 @@
 {
   "name": "storagedb2",
-  "version": "1.0.2",
+  "version": "1.0.4",
   "description": "MongoDB-like API for HTML5 Storage (localStorage and sessionStorage)",
   "main": "lib/index.js",
   "scripts": {

package.json

@@ -1,4 +1,5 @@
 import ID from './id'
+import MockStorage from './mock-storage'
 import isObject from './utils/is-object'
 import queryMatch from './utils/query-match'
 import sortCompare from './utils/sort-compare'
@@ -8,11 +9,11 @@ class Collection {
 		opts = opts || {}
 
 		this.name = name
-		this.storage = db.storage
+		this.storage = db.storage || new MockStorage()
 		this.path = db.database + db.sep + name + db.sep
 		this.primaryKey = opts.primaryKey || db.primaryKey
-		this.cache = null
-		this.cacheable = false
+		this.cache = {}
+		this.cacheable = !db.storage
 	}
 
 

src/collection.js

@@ -1,3 +1,4 @@
+import isSupported from './utils/is-supported'
 import Collection from './collection'
 
 class StorageDB {
@@ -8,6 +9,10 @@ class StorageDB {
 		this.database = opts.database || 'db'
 		this.primaryKey = opts.primaryKey || '_id'
 		this.sep = opts.sep || ':'
+
+		if (!isSupported(this.storage)) {
+			this.storage = null
+		}
 	}
 
 	get (name, opts) {

src/index.js

@@ -0,0 +1,12 @@
+class MockStorage {
+	constructor () {
+		this.length = 0
+	}
+
+	key() {}
+	setItem() {}
+	getItem() {}
+	removeItem() {}
+}
+
+export default MockStorage

src/mock-storage.js

@@ -0,0 +1,15 @@
+const isSupported = (storage) => {
+	if (!storage || !(storage instanceof Object)) {
+		return false
+	}
+
+	try {
+		storage.setItem('_supported', '1')
+		storage.removeItem('_supported')
+		return true
+	} catch (e) {
+		return false
+	}
+}
+
+export default isSupported