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A brief introduction of AJAX Technology

2025-02-14 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > Development >

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This article mainly explains the "brief introduction of AJAX technology". The content of the explanation in the article is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "the brief introduction of AJAX technology".

AJAX mode

Many important technologies and AJAX development patterns can be learned from existing knowledge. For example, in an application that sends requests to the server, it must include request order, priority, timeout response, error handling, and callbacks, many of which are already included in the Web service, as in today's SOA. AJAX developers have a complete knowledge of system architecture. At the same time, as the technology matures, there will be many areas for improvement, especially the ease of use of the UI part.

AJAX development is very different from traditional CS development. These differences introduce new programming problems, the biggest of which is ease of use. Because AJAX relies on the browser's JavaScript and XML, browser compatibility and supported standards have become as important as the runtime performance of JavaScript. Most of these problems come from a combination of browsers, servers, and technologies, so you must understand how to make the best use of these technologies.

Combining various changing technologies and strongly coupled customer service environment, AJAX puts forward a new development method. AJAX developers must understand the traditional MVC architecture, which limits the boundaries between application layers. At the same time, developers also need to consider the external aspects of the CS environment and use AJAX technology to redefine MVC boundaries. Most importantly, AJAX developers must prevent Web applications from being considered as a collection of pages and need to think of them as a single page. Once the scope between UI design and service architecture is strictly separated, developers need to update and change the set of technologies.

Always think about the user

The biggest opportunity for AJAX is the user experience. In the process of making applications more responsive and innovative, the rules that define Web applications are being rewritten; so developers must pay more attention to users. Now users are getting used to how to use Web applications. For example, users usually expect a few seconds of delay and screen refresh with each button click, but AJAX is breaking this long-term situation. So the user needs to relive the response of the button click.

Usability is an exciting part of AJAX and several novel technologies have emerged. The most striking of these is a technique called "yellow concealment", which changes the user interface to yellow before the data is updated and returns to its original color immediately after the update is completed. AJAX developers liberate users from the load of Web applications; take care of the rich interfaces provided by AJAX, and desktop developers will soon find that AJAX is their direction.

Several tools and techniques

As AJAX quickly catches the spotlight, I think developers' expectations for this technology have increased rapidly. Like any new technology, the prosperity of AJAX needs an entire development tool / programming language and related technology system to support.

JavaScript

As the name suggests, the most important and overlooked concept of AJAX is that it is also a JavaScript programming language. JavaScript is an adhesive that integrates parts of an AJAX application. Most of the time, JavaScript is generally considered by server-side developers as something that enterprise applications don't need to use, which should be avoided as much as possible. This view comes from the previous experience of writing JavaScript code: complex and error-prone languages. Similarly, he is also thought to scatter application logic arbitrarily across servers and clients, making problems difficult to find and code difficult to reuse. In AJAX, JavaScript is mainly used to transfer data from the user interface to the server and return the results. The XMLHttpRequest object is used to respond to the data passed through HTTP, and as soon as the data is returned to the client, you can use DOM to put the data on the network surface.

XMLHttpRequest

The XMLHttpRequest object is already implemented on most browsers and has a simple interface that allows data to be passed from the client to the server without interrupting the user's current operations. Data transferred using XMLHttpRequest can be in any format, although the name suggests data in XML format.

Developers should already be familiar with many other XML-related technologies. XPath can access data in XML documents, but understanding XML DOM is a must. Similarly, XSLT is the easiest and fastest way to generate HTML or XML from XML data. Many developers are already familiar with Xpath and XSLT, so it makes sense for AJAX to choose XML as the data exchange format. XSLT can be used on both client and server side, and it can reduce a lot of application logic written in JavaScript.

CSS

In order to browse AJAX applications correctly, CSS is an important weapon that AJAX developers need. CSS provides a mechanism for separating application style and design from content. Although CSS plays a vital role in AJAX applications, it is also a major obstacle to building and creating cross-browser applications, as different browser vendors support different CSS levels.

Server side

But unlike on the client side, AJAX applications on the server side still use mechanisms based on languages such as Java,.Net and PHP; it does not change the main approach in this area.

In that case, our interest in the Ruby o ­n Rails framework has increased rapidly. More than a year ago, Ruby o ­n Rails has attracted a large number of developers to build Web and AJAX applications based on its powerful capabilities. Although many rapid application development tools still exist, Ruby o ­n Rails seems to have the ability to simplify the construction of AJAX applications.

Development tools

In actually building AJAX applications, you need more than just a text editor. Since it is JavaScript non-compiled, it can easily be written and run in a browser; however, many tools provide useful extensions such as syntax highlighting and intelligent completion.

Different IDE provides different levels of support for JavaScript. IntelliJ IDEA from JetBrains is a better IDE for JavaScript development, although many developers also like Microsoft's Visual Studio products (promise to improve support for AJAX in the latest version). Eclipse includes two free JavaScript editor plug-ins and a commercial Komodo IDE from ActiveStat.

Another problem in JavaScript and AJAX development is debugging difficulties. Different browsers provide different, often hidden, runtime error messages, while JavaScript's flaws such as dual variable assignments (usually due to lack of data types) make debugging more difficult. In the development of AJAX, debugging is more complicated because it needs to identify whether it is a client-side or server-side error. In the past, the method of JavaScript debugging was to delete all the code and add line by line until an error occurred. Now, more developers are going back to Microsoft Script Debugger for IE and Venkman for Mozilla browsers.

Thank you for your reading. The above is the content of "brief introduction of AJAX Technology". After the study of this article, I believe you have a deeper understanding of the brief introduction of AJAX technology, and the specific use needs to be verified in practice. Here is, the editor will push for you more related knowledge points of the article, welcome to follow!

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