Creating web applications is a great fun. Using web applications web developer and web designer come together to solve problems for their customers. The interesting part is that the customers might not have even known about the problems. This is how blogging tools come into existence, like blogger and MovableType. Just think on it before these blogging tools did the customers know that they needed an online tools to build your website. Web applications are revolutionary and makes your work more convenient, but on the other hand their drawback is that are mostly boring and slow. Even if you look at the fastest of them, it will give you enough time to take bath, make yourself a coffee or the worst will be your customer will go for some one faster then you. That is when Ajax comes into the roll. Ajax is a way of programming that will help you to get rid slow web applications and will help you to gain customers instead of loosing them. Ajax is sometime called as AJAX or asynchronous JavaScript and XML. It is basically a group of web development techniques used on the client side and used to create rich internet applications or interactive web applications. Most notable feature of the Ajax is that web applications using Ajax can reclaim data from the server asynchronously in the background without disturbing the display and the performance of the existing page. Google Map will help you to understand the avowal it updates in front of your eyes without making you wait for the page to reload or refresh.
Ajax as an Intermediate
It was Ajax that bring a boost in improved quality of Web services because of the use of asynchronously mode and interactive animation on web pages. In general data is retrieved by means of XMLHttpRequest object. The term Ajax is a misnomer and in spite the use of JavaScript and XML in the name they are not required. Likewise the data request are not compulsorily asynchronous. Other famous examples of Ajax are Gmail, famous web mail service from Google and live chat support. Ajax is not an a technology in itself, just like LAMP and DHTML. Ajax work in a combination of HTML and CSS (cascading style sheets) for styling and marking up the content. The DOM is accessed with JavaScript to dynamically display and interact with the content presented.
By tradition Web applications customer and the server interacts in a process when customer access web application with server processing the request and sends data to the web browser. Next step is the customer click on the link and server again process the request to the web browser and all this customer is waiting and waiting. On the other hand Ajax works on the completely different side and doesn’t make customers waiting very long. First of all Ajax works within the Web browser using DOM and JavaScript to render web application and handle all the requests customer asks from the server. Since Ajax engine is handling all the requests, so a lot of data can is hold in the engine itself. While the interaction between customer and application happens asynchronously and separately.
Why Asynchronous
In standard web applications interaction between the customers and server happens to be synchronous. This explains that one has to happen after other or like in a line. For example:
customer clicks a link > request is sent to the server > server sends back result
On the other side Ajax the JavaScript is loaded and the page loads handles most of the fundamental tasks like data manipulation and validation. Display rendering is handled by Ajax engine. The Ajax engine compose display changes for the customers and at the same time the data is send backward and forward to the server. One thing to be noted here is that data transfer is not dependent on the actions of customer. Ajax is not a new technology it’s a new way of looking at an already firm and mature technology.
