For one thing, it's Asynchronous JavaScript and XML (AJAX) is not a technology. AJAX is a technique that has brought a great change in the world of web development.
The AJAX technique comes in response to growing demand for interactive web applications. With AJAX, web page change small amounts of data with the server behind the scenes. This means that every time a new piece of data entered by the user, or if there is a demand for change, the entire pagebe recharged. Usability is also affected due to AJAX. After all, creating conditions that AJAX is a complex scenario that is data-centric and user centric. The difference between Web pages and other applications has been thinned down by using AJAX.
As already mentioned, AJAX is not a technology, and this technique combines several existing technologies such as XHTML (or HTML), CSS, DOM, XMLHttpRequest (or alternatively IFrame)XML.
Here is how these individual technologies play a role in AJAX:
or XHTML (or HTML) and CSS are used to mark up and styling information.
o The DOM (Document Object Model) is for real interaction with the information presented is done working.
or exchange data asynchronously with the web server is to use the XMLHttpRequest. Although there are many cases where I used an IFrame object instead.
o Although pre-formatted in HTMLwould work, XML is often used to transmit data between servers and clients.
The advantages and disadvantages of using AJAX are in fact subject to interpretation. Here are some reasons that are cited as benefits of AJAX.
o The main reason for using AJAX is to enhance the user experience and Web pages behave more like standalone applications.
or AJAX pages load faster because it generates HTML within the browser. NetLoading the page in a staggered, the bandwidth for a web page will be significantly reduced.
o The third advantage is widely criticized for a widespread misunderstanding about AJAX - that there is no match n mix 'of different techniques is not room for any consistency. But with AJAX programmers tend to be a clear separation between the methods and formats that are used for the purpose of providing information to provide. In other words, the separation between the contentwhich provide the structure and style of the site and the site functionality.
On the other hand, the disadvantages that people associated with the use of AJAX.
Or as with AJAX, you do not register the page with a browser history engine, the user is often not use the "Back" on your browser. Additionally, AJAX also makes it more difficult for users to "bookmark" a page in a certain stage of us. The solutions created to dealThese problems were not enough, and these problems remain unresolved for the most part.
o The possible delay between the user request and server response is an obvious disadvantage of AJAX. This delay, as the network latency is still known by a phenomenon that has nothing to do with technology. While in some parts of the human eye is naturally done it again, turns on the identification of items that have changed the current page. On the other hand, if there are small bits of the pagemade individually and can see you do not think the change immediately, latency, when there is, in fact there.
o Another potential problem is that search engines will not function, the JavaScript part of AJAX functionality. It 'important to note that this particular problem is not limited to AJAX.
o An additional problem of compatibility with AJAX. JavaScript, AJAX, that depends, can be implemented differently by different browsers.
At first glance, theDisadvantages seem to outweigh the benefits of AJAX to make a choice seem less attractive to developers. There is no doubt that AJAX is complex, and there are many developers who are familiar with their language. But a change was bound to come across Google AJAX in their applications.
Google's move is a milestone in the field of web development. Google applied to compilers to help them in this huge task. Compilers give developers the ability to develop the code / inmother tongue, it becomes a secondary language that computers understand. In Java, the compiler is JavaScript, so that developers could be left in the first project and build the compiler to convert the same into it. This technology was freely shared with the community of developers and is) known as the Google Web Toolkit (GWT.
The GWT development cycle is very simple:
1. Using Java to design, develop, debug and test. In this processIt may or may not decide to use libraries that appear to be using GWT. They are free, Java tools that you feel comfortable using - Eclipse, IntelliJ, JProfiler, JUnit.
2. Use the GWT compiler, that the use of Java, a number of JavaScript and HTML files can work with any web sever distilled.
3. Ensure compatibility of use with the browser you want.
GWT can work in two ways - hosted mode and web mode.
Hosted mode: mostDevelopment time is usually in this way, because, as the application is running as a Java byte code in a Java Virtual Machine (JVM) would be issued, you can simply use the debugging features in Java .
Web Mode: In this mode, the application run as pure JavaScript and HTML
If AJAX is the browsing experience of users, GWT is to limit the development process in the most remote possible light, it is easier. And it is easy to use GWT for developersAJAX for building applications. For example, the most common mistakes that come with JavaScript, such as typing errors and imbalances type at the time of identification. There is often a conflict between doing what is easy for developers, and what is useful for users. This conflict must be pointless to say that what is beneficial for consumers. And the result of using GWT and things more convenient for developers, of course, would be a better web experience for users.
L 'The main features of Google Web Toolkit are:
or even if, unlike traditional HTML web applications, GWT applications do not obtain new export HTML pages, which have, in fact, the data received from the server. also known as a server, this mechanism is better than Remote Procedure Call (RPC) is known and allows interaction with the server over a network.
o The presence of dynamic, reusable UI (User Interface) frameworks. The main difference between the user interfaceGWT framework in the road compared to other widgets (client-side Java classes needed to create user interfaces) should be rendered.
or the integration of debugging in hosted mode.
o Allows the appropriate handling of browser history.
Automatic or compatibility with different browsers is another interesting feature of GWT applications.
o An additional feature of GWT that helps you internationalize your applications and libraries.
GWT Or, you canunit tests in a debugger and browser.
O Using the JavaScript Native Interface (JSNI) can be handwritten JavaScript code in Java.
o The most important feature of GWT, the fact that the code is completely open source.
To the uninitiated this may seem too technical. But the real purpose of GWT is to extract from the Web developer of techniques and give them space to create something that speaks to their end customers. And the demand for interactiveRooms online only increase. The trend AJAX obsolete and thanks to GWT developers the ability to get slowly but surely over their initial fears about the difficulties that AJAX poses. The role of developers in the development life cycle of a Web application can not be affected, but with AJAX GWT lets his role is in fact no longer just be that the operations of typing together back-end. Google Maps is an excellent example of the benefits of working with AJAXGWT framework. Google map is latest example of something that is dynamic, engaging and completely user-friendly. Search by location and features such as zoom in / out immediately is a huge step forward. Imagine that you wait forever to reload the page when you click on a search path, or click in the search bar? The real purpose would be defeated with the paper when it came to the same amount of time looking for a specific place in line, as wouldon a printed map. There are some critics who say
GWT AJAX allows the practical way forward is. End users almost take it for granted, but the work that goes behind creating this experience for the end user is paying. In fact, GWT has made ease of development possible without getting on user satisfaction. With techniques like AJAX, GWT and systems as the future of Web development, is one that is promising for both users and developers!
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