One of the most common tasks when displaying data through an HTML table is to allow the user to manipulate data within the table. Displaying data on a grid can involve many different operations (retrieving, sorting, live editing, search). Using AJAX to dynamically fill the table requires even more work since the application (in this case, javascript code) has to convert JSON/XML/TEXT data to an HTML element. Each of these tasks can involve more or less time in order to be completed, and of course, tested.

read on