Detect whether storage is disabled by attempting to store and retriev…

…e a value. It is the correct way to define disabledeness, and will catch cases such as localStorage throwing in Safari under Private Browsing mode.

store.js

@@ -25,6 +25,7 @@ var store = (function(){
 		doc = win.document,
 		localStorageName = 'localStorage',
 		globalStorageName = 'globalStorage',
+		namespace = '__storejs__',
 		storage
 
 	api.disabled = false
@@ -109,9 +110,15 @@ var store = (function(){
 			}
 			storage.save(localStorageName)
 		})
-	} else {
+	}
+
+	try {
+		api.set(namespace, namespace)
+		if (api.get(namespace) != namespace) { api.disabled = true }
+		api.remove(namespace)
+	} catch(e) {
 		api.disabled = true
 	}
-
+	
 	return api
 })();

test.html

@@ -24,6 +24,7 @@
 			function assert(truthy, msg) { 
 				if (!truthy) {
 					outputError((isSecondPass ? 'second' : 'first') + ' pass bad assert: ' + msg);
+					if (store.disabled) { outputError('<br>Note that store.disabled == true') }
 					testFailed = true
 				}
 			}