AJAX Interview Question

There are many things that you can do ahead of time to prepare for the interviewing process, and move yourself a step above of the competition. Updating your resume and reviewing frequently asked interview questions can be very effective, and goes a long way in getting the most out of your interview.

How do I test my AJAX code?

There is a port of JUnit for client-side JavaScript called JsUnit

 

What exactly is the W3C DOM?

The W3C Document Object Model (DOM) is defined by the W3C as the following: The Document Object Model is a platform- and language-neutral interface...

 

When will HTML_AJAX have a stable release?

Once all the major features are complete and the API has been tested, the roadmap gives an idea of whats left to be done.

 

What parts of the HTML_AJAX API are stable?

We don't have a list right now, but most of the API is stable as of 0.3.0. There should be no major changes at this point, though there will be lots of new additions.

 

What Browsers does HTML_AJAX work with?

As of 0.3.0, all the examples that ship with HTML_AJAX have been verified to work with
* Firefox 1.0+
* Internet Explorer 5.5+ (5.0 should work but it hasn't been tested)
Most things work with
* Safari 2+
* Opera 8.5+

 

Is the server or the client in control?

It depends. With AJAX the answer is more in between. Control can be more centralized in a server-side component or as a mix of client-side and server-side controllers.

* Centralized server-side controller - When having a more centralized controller the key is to make sure the data in client-side page is in sync with that of the server. Some applications may keep all the state on the server and push all updates to client DOM via a simple JavaScript controller.
* Client and server-side controllers - This architecture would use JavaScript to do all presentation related control, event processing, page manipulation, and rendering of model data on the client. The server-side would be responsible for things such as business logic and pushing updated model data to the client. In this case the server would not have intimate knowledge of the presentation short of the initial page that would be sent to the client page request.

There are some use cases where an entire AJAX application can be written in a single page. Keep in mind if you choose this type of architecture that navigation and bookmarking should be considered.
Both methods are viable depending on what you are trying to accomplish. I tend to prefer spreading the control across the client and server.