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Using Dojo and JSON to Build Ajax Applications
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04/28/2006 By Zarar Siddiqi
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"Ajax" is a buzzword that is gaining momentum and popularity. Applications such as Gmail and Google Suggest serve as massive advertisements for asynchronous JavaScript. As users gain familiarity and their expectations increase, the demand for such interfaces is rising.
In this article, I will show how to build Ajax-enabled applications using Dojo and JSON--two very different but complementary technologies that can significantly enhance the interface and usability of web applications. With the help of some simple examples, you will learn how to use Dojo and JSON to build Ajax applications. This article will also demonstrate how to create custom Dojo widgets by implementing the popular "autocomplete" feature for HTML text boxes.
What Is Dojo?
Dojo is a set of powerful JavaScript libraries that provide a simple API to a plethora of features. One of these features is the ability to make HTTP requests and receive their responses. This is the main functionality of Dojo that we will utilize. Aside from providing Ajax functionality, Dojo also provides packages for string manipulation, DOM manipulation, drag-and-drop support, and data structures such as lists, queues, and stacks.
What Is JSON?
JSON is a Java library that helps convert Java objects into a string representation. This string, when eval()ed in JavaScript, produces an array that contains all of the information that the Java object contained. JSON's object notation grammar is suitable for encoding many nested object structures. Since this grammar is much smaller than its XML counterpart, and given the convenience of the eval() function, it is an ideal choice for fast and efficient data transport between browser and server.
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