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Amarachi Kanu
Amarachi Kanu

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AJAX Explained: Enhancing User Experience with Asynchronous javascript

Ajax stands for (Asynchronous JavaScript and XML). In web development, providing a responsive and engaging user experience is necessary. This is where the concept of asynchronous in JavaScript comes into play. Asynchronous operations enable developers to make websites behave like desktop applications. It allows developers to execute tasks without blocking the main thread, ensuring user interfaces remain responsive while different tasks are being carried out in the background.

Asynchronous means exchanging data to/from the server in the background without having to refresh the page.

Ajax is a technology for developing better, faster, and more interactive web applications with the use of html, css, javaScript and XML. Ajax uses XHTML for content, css for presentation, along with document object model and javaScript for dynamic content display.

Synchronous vs asynchronous

Let’s briefly differentiate between synchronous and asynchronous operations

Synchronous Operations

Synchronous is a blocking architecture, which means the execution of each operation is dependent on the completion of the one before it. Synchronous starts at the very top of the file and executes all the way down to the bottom of the file, each line in order until it gets to the bottom, then it stops. In synchronous, tasks are executed one after the other in a sequential manner.

Asynchronous operations

AJAX enables you to retrieve and send data to a server asynchronously in the background. Asynchronous starts at the top of the file and executes the code until it gets to the bottom. During that execution it’ll run into certain asynchronous functions or code where it’ll slip off and execute that asynchronous code separately from the rest of the code which is usually because it has to wait or do some operations that take a long period of time.
The significance of providing a smooth and responsive user experience in web applications
Providing a smooth and responsive user experience is crucial in various reasons;

  • When a web application is smooth and responsive, users are very likely to stay engaged, return, and also recommend your web application. Users are most likely going to abandon websites and applications that are slow and not responsive.
  • Responsive web design ensures that users can access and interact with your website easily and comfortably. By offering a better experience, you can reduce bounce rates and maintain your audience. -It can also help improve accessibility for individuals with disabilities. A faster, responsive website is more likely to rank higher in search results.

  • Having a responsive website makes it easier for users to find the information they are looking for and usually encourages them to stay on your site.

Conditions where asynchronous is essential

When you have several tasks that you want the applications to operate on, consider using asynchronous. It allows you to complete several tasks at once since it's not necessary for the application to wait to complete them individually. It allows applications to continue executing other tasks while waiting for the response of the API. in user interface, asynchronous communication is essential in preventing freezing or lagging. When fetching data from API, asynchronous is essential.

The user interface remains responsive by fetching API data asynchronously. Asynchronous creates a smoother user experience. If an API request takes so long, it can be cancelled or it can be handled smoothly, hindering the application from becoming inert indefinitely, because asynchronous permits for the implementation of time outs and error handling tactics.
In addition, asynchronous is also essential in handling user interactions. Asynchronous allows developers to apply problem resolution that tackle issues without causing the total application to crash or freeze. It’s also vital for controlling background processes such as data synchronisation without disrupting the user’s main interaction.

Asynchronous is vital for performing background tasks because it permits applications to sustain reactivity and supply a better general user experience. Asynchronous is a crucial technique for modern software development.


In summary, Ajax with its asynchronous proficiency, fundamentally changes user interactions on the web. By facilitating smooth data retrieval and updates without full page reload, it paves the way for swift and more dynamic web experiences. It’s impact on modern web development cannot be overstated, consistently enhancing user satisfaction and engagement.

Top comments (2)

nessiigreen profile image

Insightful read.

efpage profile image

Maybe you should mention that AJAX was introduced in 2005, XMLHttpRequest was already known in IE5.0 in 1999. So all this "changes" happened long ago. Using asynchronous data operation is a standard today, and there are many different options to do so. As XML is not very popular any more, most people will possibly use the fetch API or some high level tools like HTMX, that cover the complexity of plain Ajax in a more userfriendly package.