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Using UIY LIbrary can make adding this kind of functionality far easier than it would be if needed to write it from scratch. The UIY LIbrary was also tested in different browsers and operating systems, so the customers could be confident that the basic code will work. It is very important to test this kind of functionality thoroughly .Not only for cross-browser compatibility, but also to ensure that users don’t find the functionality difficult to use on confusing.
Okey, anyhow you probably thinking : “But what about users without JAva script?”
The good thing about Javascript writing in a modern way that usually we start out with regular markup. We do’t write the list into page with Javascript,we created a regular HTML list and then use JavaScript to manipulate it. This means that,at the very least ,any user without JavaScript can read the content of the list.As we are writing the image drag handles with JavaScript ,they won’t see those and end up with a confusing situation of seeing something that says ‘drag’ but doesn’t work. In the context of your application you than need to make the decision as to whether the odering is a core part of the functionality and needs to be provided in another way, or if it can simply not to be there for users without JavaScript. For users without JavaScript, you would need to first create the list along with text fields to set the order by entering a number, then remove them in JavaScript before adding drag and drop. This means that you may feel you’r creating functionality twice, however it is important to ensure your application is usable by all. For more info go to http://addactio.com/articles/1150