Use AJAX

AJAX is a technique for creating fast and dynamic web pages. AJAX allows web pages to be updated asynchronously by exchanging small amounts of data with the server behind the scenes. This means that it is possible to update parts of a web page, without reloading the whole page.

Suppose you are assigned a task to develop a web application for stock exchange market. One of the client requirements is to show the updated stock exchange data of Pakistan, China, America, Australia and India. The data of Pakistan, China America, Australia and India should be updated after every 2 seconds, 4 seconds, 1 second, 6 seconds and 8 seconds respectively. Another requirement is to show summary of updated data of all given countries after every 8 seconds. If you as a developer are provided with the following two options to choose to implement the above requirements, which option would you prefer and why? Support your answer with solid arguments.

Option1: Use AJAX

Option 2: Reload whole page after each update

Give your opinion with solid reasons to support your answer.

Inline styling is mainly used these days for above the fold rendering on speed critical sites but used very sparingly. Most websites do not need this type of structure if coded correctly in the first place.

Avoid inline styling at all costs unless you have a justified use case as mentioned above or perhaps for dynamic styling with js for some special effects.

In general stylesheets should be external.