What is Ajax? & How It works?

AJAX is short for¬†Asynchronous JavaScript and XML. It is not a tool or a programming language rather it is a technique or concept which is used to create fast and efficient web pages. It is a client site script that communicates with server without the need of reloading the whole page or post back. Simple meaning, Ajax is an approach of swapping data with a web server, and updating or changing portions of a webpage – without refreshing the whole webpage. In more technical terms, it means the use of JavaScript objects XmlHttpRequest to dynamically interact with a server. Traditional web pages, which don’t make use of Ajax, have to reload the whole page if the content of any part of the web page need to be changed. Nowadays Ajax is used in almost every popular web application like Facebook, Twitter, YouTube, Google Map, Gmail and so on.

 

 

How Ajax Works?

Ajax callbacks can be made by instantiating an XMLHttpRequest object in the client-side browser via JavaScript. The http request is then sent to the web server to be processed. The web server creates a response and sends data back to the client side (browser). The browser processes the returned data via JavaScript and updates the part of a web page. The following figure (source W3school) will demonstrate how Ajax works.

Ajax isn’t just a single technology; rather it is a set of technologies. Ajax is a combination of:

XMLHttpRequest object (used to swap data asynchronously with the web server)

JavaScript/DOM (used to display the information or interact with the information)

CSS (used to add style to the information)

XML (frequently used as a format to transfer data)

Advantages of Ajax:

There are three main advantages of using Ajax in website:

 Greater interactivity: This is the main reason why a lot of developers and programmers are using AJAX in their websites. AJAX permits simpler and faster interaction between the visitor and website since webpages are not reloaded for content to be shown.

Simpler Navigation: AJAX applications on a website can be created to permit simpler navigation to visitors compared to making use of the classic back and forward button on a web browser.

Greater Speed: The primary goal of Ajax is to increase the speed, efficiency and user friendliness of a web application. A good instance of Ajax is the movie rating system on the website. The visitors rate movies and their personal ratings will be saved to the database without waiting for the webpage to reload.

Why and Where Ajax is used

Ajax should be used anyplace in a website where a few amounts of information need to be stored in a web server or retrieved from the web server without submitting back the whole page. A great example of applying Ajax is validating data on a save action.

Other great example would be to include suggestions and auto complete text boxes dynamically during the time of filling up a form. For example the user types a couple of letters to find a name and a list of all names which begin with those characters appears below. A callback is created to the web service which will obtain all names that start with these letters. This is really a wonderful function that would not be possible without Ajax. For learning more tips or getting help from a company that are expert in the topic please visit us at Boostwebseo.com.

DavidWat