Ajax comprehensive overview
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Ajax comprehensive overview
Ajax called "Asynchronous JavaScript and XML" (Asynchronous JavaScript and XML), refers to a Web application to create interactive web development technology. Ajax technology is currently in the browser JavaScript scripts can be used by all the technical set. Ajax in a new approach to the use of all of these technologies, making the old B / S of Web development radiated a new vitality.
Ajax technology, the core technology is XMLHttpRequest, its original name called XMLHTTP, Microsoft is developing to meet the needs of 1999 in IE5.0 browser first launched. Later this technique is named for the above norms XMLHttpRequest. Ajax technical reason why it is unusual places. In short, XMLHttpRequest browser running on the JavaScript scripting provides a page of the means of communication with the server. Pages within the JavaScript can not refresh pages from the server where access to data, or submit data to the server. XMLHttpRequest to the emergence of Web development provides a new possibility, or even the whole of the people to change from what the Web application to form opinions. It enables us to a whole new way to do Web development for the user to provide better interactive experience.
Web development with the traditional different, Ajax is not based on static pages in a way to look at Web applications. Ajax from the point of view, Web applications should be composed of a small number of pages, each page is a small Ajax applications. Each page above include some use of JavaScript development of the Ajax components. These components use XMLHttpRequest object to the way asynchronous communication with the server, access to the server from the data needed to use the DOM API to update pages in the part. Therefore Ajax applications with traditional Web applications in three main areas distinction:
1. Do not refresh the entire page, the page of communication with the server.
2. Use asynchronous communication with the server mode, users do not need to interrupt the operation of a more rapid response capacity.
3. Only by the application of a small number of pages. Most of the pages in the interactive completed, need not switch the entire page.
Thus, Ajax makes more dynamic Web applications, bringing a higher intelligence, and ability to provide a performance rich Ajax UI components. This new type of Web application called RIA (Rich Internet Application) applications.
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