write javascript scripts

Sep 08

adminWriting ajax, javascript, software, tools, web2.0 No Comments

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JavaScript and Ajax

JavaScript is client-side scripting language. When you open a web page on your browser first web downloads all necessary files from the server to display the page properly. The necessary files are HTML, CSS, images, videos and files etc JavaScript too. After completing the download of the browser window displayed on your page and any script associated with it is run from the file downloaded script.

In Ajax technology, user input and other data are sent to the web server via JavaScript. JavaScript creates XML_HTTP_REQUEST_OBJECT to connect to the server, sending data to it, and to request a response from the server. When the response arrives, a fire event and the JavaScript function associated with that event is then executed. So in the Javascript Ajax technology is only used to transfer data between the client side and server side, while the program principal, ie data processing running on the server side in PHP or any other server language.

As JavaScript is executed from the computer client runtime is very short, almost instantaneous. Viewers can run JavaScript without being connected to the server. But Ajax, viewers must be connected to the server. Here the running time is much longer depending on the speed of your Internet connection, server hardware and the number of bytes transferred between the client side and the server.

In terms of server security and JavaScript are absolutely sure that does not transfer any entry user from the client to the server side. But Ajax have to take special care to prevent the malicious user data wrong.

In JavaScript you can not hide the source code. Users can read the source code of the light source that runs on your computer. But Ajax in the data processing is done on the server end user and therefore can not see the source code.

In Ajax you can support the program with your database server.

For a long program, if the use of JavaScript for execution, the size of your website will be greater. Therefore take longer to download it SEO feature wrong. But Ajax can run in the long program, the processing of several thousand data from a database, still maintains the small page size.

Since all browsers do not stick to any particular standard so that it is very easy to write a stand-alone browser JavaScript.

JavaScript is used only in some specific applications where data security is an important consideration, while the scope of the Ajax technology is unlimited.

About the Author

This article is written by susen. You can get various useful ajax/php/my-sql script and articles from author’s website: http://ramui.com/

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