Grails a Web open source framework for rapid development

This article describes a more general encapsulation scenario in which dojo is used in combination. Stateful, DOJO.XHR, Dojo. Common classes and methods such as Deferred enable developers to implement synchronous or asynchronous interactions between client and REST-style APIs in an object-oriented, simple and transparent manner.

This article will use Dojo 1.7 and follow AMD's specifications to design and implement the Web front-end http://www.aliyun.com/zixun/aggregation/14208.html "> data model that interacts with the REST API."

Preparatory work

Installing Grails

Download 2.0.1 920.html ">release version at the Grails official site

Preparing the REST API

Grails is a fast-growing web open source framework that quickly implements the REST API you need to implement the code in the annex to this article:

Table 1.REST APIs and their support HTTP methods

Using Dojo

This article will use CDN based Dojo1.7.2, and developers who are limited by the network conditions can download the Dojo1.7.2 release version at the Dojo official site.

Define the WEB-side data model and use

Geometric shapes are often used in tutorials related to object-oriented programming, and this article is no exception. The following is a UML diagram of base class Shape, subclass Circle, and Square:

Figure 1.UML Object diagram

In general, this design idea is commonplace in the back-end domain, but it also applies to the front-end, especially the OPOA (one Page one creator) project with more data objects. Based on the REST API features, AJAX code that interacts with the backend API is encapsulated in the Resource class method, and the subclass simply declares its resource name. Even if the backend API is not restful, the parent class method can be overridden in subclasses to meet a variety of requirements. This type of data encapsulation can be achieved through a variety of mainstream front-end framework, once adopted, can greatly simplify the work of front-end workers. The use of Dojo1.7 above version, the module loading, class mechanism and asynchronous programming has a unique advantage, will continue to elaborate later.