Why do we need ajax

In simple terms, AJAX means the interac tion between client and server. AJAX enables us to partially update our web applications asynchronously. The changes are made immediately without requiring a page refresh. Ajax interactions can be used to validate form entries while the user enter s the data using server-side logic , to retrieve data from the server and to dynamically update data on a page. With the help of AJAX , we can create dynamic web pages which allow us to display the changes immediately without the request having to be sent to the se r ver again.

This will help in faster processing and loading of the interactive web pages. Net does not come with the Tabs controls. However, the Ajax Control Toolkit does. The Tab control can postback to the server just like server controls. Ajax should be used anywhere in a web application where small amounts of information could be saved or retrieved from the server without posting back the entire pages.

A good example of this is data validation on save actions. Another example would be to change the values in a drop down list-box based on other inputs, such as state and college list boxes. When the user selects a state, the college list box will repopulate with only colleges and universities in that state. Another great example is when the client needs to save or retrieve session values from the server, based on a user preference such as the height, width or position of an object.

Adjusting the width could make a callback to the server to set the session variable for the new width. Ecommerce websites are among those that can use AJAX calls to load cart contents, account information, and product recommendations without embedding that information direclty into the HTML of a page.

At Section we regularly use AJAX calls combined with Varnish Cache to allow for the caching of dynamic content without sharing personalized information between users. As a basic example you could configure a page counter that changed each time a page is reloaded by programming a snippet that is loaded after the main content:.

Because this is called following the rest of the page, you can cache the entire HTML document of the page without worrying that the dynamic content will be broken. AJAX calls are beneficial for several reasons. You can find more information on setting up your own AJAX calls here. Apply market research to generate audience insights. Measure content performance. Develop and improve products. List of Partners vendors. Share Flipboard Email. Jennifer Kyrnin. Updated February 18, Table of Contents Expand.

My Stupidest Ajax Application. Before Building, Ask Why. Ajax is for Action. Things That Are Good for Ajax. When You Get the 'Ajax Call'. Featured Video. Cite this Article Format. Kyrnin, Jennifer. How to Create a Rollover Image in Dreamweaver. Delivering Sites and Project Files to Clients.