How does GitHub achieve its seamless page navigation: AJAX or a CSS/JS trick?

Github's Seamless Page Navigation: AJAX or Not?

While exploring a project on GitHub, such as https://github.com/insoshi/insoshi, you may have noticed a smooth transition when clicking into folders. This behavior, where the folder slides open and the URL changes simultaneously, raises the question: is this achieved through AJAX or other techniques?

The Answer: AJAX at Play

Contrary to appearances, this effect is indeed based on AJAX. This type of sliding menu was originally employed in the iPod browsing interface. While there may have been attempts to create similar effects with CSS/JS, the approach used by GitHub relies on asynchronous JavaScript and XML.

To visualize the AJAX requests, you can use the Firebug tool in Firefox. By enabling network monitoring, you will observe requests being made to retrieve the directory listings.

Transition Effect: Sliding into Place

The transition effect observed during folder navigation is achieved through a JavaScript-based slide animation. This technique involves manipulating CSS properties such as opacity and display to create a smooth transition between the current and target pages.

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