Blog

Jan 26

New in JsonRestStore 1.3: Dates, Deleting, Conflict Handling, and more

By on January 26, 2009 12:02 am

The JsonRestStore is a Dojo Data store that provides a JSON-based RESTful interface to servers and implements the Dojo Data read, write, notification, and identity APIs. Since its addition in Dojo 1.2, it has been a popular Data Store because of its numerous features and its standards-based implementation of the HTTP specification (RFC 2616) for communications with servers. For Dojo 1.3, JsonRestStore includes a few extra features and some of the features in version 1.2 deserve a more elaborate explanation.

Oct 22

New Features in Dojo Grid 1.2

By on October 22, 2008 11:10 am

The last article about the Dojo Grid focused on what has changed when creating a grid using Dojo 1.2. In this article we will be covering five new features of the Dojo 1.2 Grid: Dijit interoperability, selection modes, reorderable columns, header context menus, and column hiding. The examples in this article can be downloaded in a tarball (which includes the build profile I used) so you can play along from home!

Sep 23

Effortless Offline with OfflineRest

By on September 23, 2008 12:01 am

offlinerest.png There is growing support in browsers for offline capabilities with the HTML 5 specification for local storage, offline notifications, and offline application cache, but adapting an application to store changes locally and do synchronization when connectivity is restored remains a major challenge for developers. Dojo 1.2′s new dojox.rpc.OfflineRest module automates the local storage of data and synchronization by leveraging the Dojo Data and REST abstractions. The OfflineRest module augments the JsonRest service in Dojo such that requests are cached in local storage for offline access, and modification requests (put, post, and delete) modify the cache and are recorded for delivery to the server; immediately if online, otherwise when connectivity is restored. Furthermore, JsonRest is the core engine used by JsonRestStore. Consequently, you can simply use the standard Dojo Data API with the JsonRestStore and effortlessly add offline capability with no modifications to your data interaction code. The underlying Rest service automates the handling of caching, storing data locally, and syncing changes. In addition the new OfflineRest module has no dependency on plugins, but rather progressively utilizes offline features that are available, while still operating properly on legacy browsers without offline support.

Jul 23

Getting Started with Persevere Using Dojo

By on July 23, 2008 6:48 am

This post is written for Persevere 1.0 and Dojo 1.3. If you want to get started with Persevere 2.0 (recommended), take a look at this post. Dojo 1.6 and newer has a new data API as well.

The Persevere server is an open source JSON application and storage server. Persevere pairs well with Dojo; the Dojo Data paradigm has a strong correlation to Persevere’s data storage structure. Virtually everything you can create or action you can perform with Dojo Data can be persisted in Persevere’s data storage including subobjects, arrays, circular references, and functions. Combining Persevere with Dojo allows you to rapidly develop simple database applications with create, read, update, and delete (CRUD) capabilities with minimal effort.

Jul 14

Dojo 1.2 Grid

By on July 14, 2008 12:34 am
NOTE: This article is out of date.
Read about the new dgrid for something fresh!

With the release of Dojo 1.2 right around the corner, there’s an updated grid widget available. It offers new features and performance improvements over the existing grid including better Dojo data integration, simplified layout structures, and the ability to enable editing much more easily.

Jun 25

Web Service to dojo.data Store in 4 Easy Steps

By on June 25, 2008 7:12 pm

A very useful feature of Dojo is the dojox.data.ServiceStore data store. It allows you to layer a dojo.data API on top of any web service, opening up a world of uses from your own client-side components. Kris Zyp briefly mentioned the topic in his recent article on JsonRestStore, and the past couple of weeks have seen a bunch of refinements to the component to get it ready for next month’s Dojo 1.2 release. Let’s take a quick look at how to make it work with the web service of your choice.

Jun 13

RESTful JSON + Dojo Data

By on June 13, 2008 12:03 am

jsonreststore-simple.png
Dojo 1.2 now includes an infrastructure for interacting with JSON REST services and data storage systems. JsonRestStore is a new Dojo Data store for interacting with the RESTful JSON data sources. This new data store allows you to communicate with server side database/persistent data storage using the Dojo Data API with JavaScript and efficiently handles create, read, update, and delete (CRUD) operations. This can greatly simplify client server communication, interacting can be done simply using straightforward JavaScript instead of having to build your communication for CRUD actions. In addition, Dojo data stores can plugin to many Dojo widgets (Dijits).

Complex database driven widgets can be utilized with minimal coding effort. RESTful JSON is an increasingly popular database interface, and in later posts we will look at how JsonRestStore can be used with Amazon S3, CouchDB, Persevere, and Ruby on Rails. The JsonRestStore fully implements the Dojo Data read, write, notification, and identity interfaces. Therefore it can be used with any widget that can utilize these data stores including widgets with editing and live auto-updating features.