Posts Tagged ‘IndexedDB’

We are going to build a client side data layer for a note-taking web app: From a data model point of view, it’s about as simple as it can get. The app allows users to write text notes and tag them with specific key words. Each note will have a unique identifier that will serve as its […]


[This documentation is preliminary and is subject to change.] Windows Internet Explorer 10 and Metro style apps using JavaScript support the Indexed Database API (:IndexedDB”). IndexedDB enables you to store structured data. Unlike cookies and DOM Storage, IndexedDB provides features that enable you to group, iterate, search, and filter JavaScript objects. The IndexedDB API is defined by the World […]


IndexedDB is designed to cover most cases that need client-side storage. However, it is not designed for a few cases like the following: Internationalized sorting. Not all languages sort strings in the same way, so internationalized sorting is not supported. While the database can’t store data in a specific internationalized order, you can sort the […]


scope The set of object stores and indexes to which a transaction applies. The scopes of read-only transactions can overlap and execute at the same time. On the other hand, the scopes of writing transactions cannot overlap. You can still start several transactions with the same scope at the same time, but they just queue […]


key A data value by which stored values are organized and retrieved in the object store. The object store can derive the key from one of three sources: a key generator, a key path, and an explicitly specified value. The key must be of a data type that has a number that is greater than […]


database A repository of information, typically comprising one or more object stores. Each database must have the following: Name. It identifies the database within a specific origin and stays constant throughout its lifetime. The name can be any string value (including an empty string). Current version. When a database is first created, its version is the […]


Because the Indexed Database API specification is still evolving, Windows Internet Explorer 10 and Metro style apps using JavaScript use a vendor prefix (“ms”) for the msIndexedDB property. For best results, use feature detection to access the IndexedDB API, as shown in the following example: var ixDB; if ( window.indexedDB ) { ixDB = window.indexedDB; […]


If you have assumptions from working with other types of databases, you might get thrown off when working with IndexedDB. So keep the following important concepts in mind: IndexedDB databases store key-value pairs. The values can be complex structured objects, and keys can be properties of those objects. You can create indexes that use any […]


IndexedDB is a way for you to persistently store data inside a user’s browser. Because it lets you create web applications with rich query abilities, these applications can work both online and offline. IndexedDB  is useful for applications that store a large amount of data (for example, a catalog of DVDs in a lending library) and […]