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How Better Backend Integration Using AJAX

Category ECommerce Portal Interview Questions
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Added on 7/18/2016
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Question :

How Better Backend Integration Using AJAX


Using JavaScript, a visitor could interact with a page. But if he wanted to load another page or complete a new form, he?d have to wait for the server to respond with a new page or a new form.

While this worked okay, it wasn?t very smooth. It was frustrating, for example, to change shopping cart quantities for five items and remove a few others. Each change would take a few seconds to load. Shoppers would often become annoyed and leave.

Enter AJAX ? Asynchronous JavaScript and XML ? which was developed around 2005. AJAX allowed web applications to send data to and retrieve from a server asynchronously (in the background) without interfering with the display and behavior of the existing page. Instead of the user performing an action and then waiting for a new page to appear, she could perform an action and AJAX would communicate with the server in the background and then update the existing page automatically.

This opened up many interactions that are now common:

Updating an item in a cart and seeing the change right away;
Search suggestions and results that appear as you type;
New email messages appearing automatically in Gmail;
Ability to drag and drop elements of a web page;
Forms that notify you of problems as you fill them out.
AJAX enabled JavaScript to expand its capabilities, so interactions were more than just visual changes and hints. They affected how a store functions.

Now, because of AJAX, modern ecommerce applications are full of these dynamic, backend-supported interactions.
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