Uploading files has been done since the ice age of web development. In fact uploading a file using Html4 and an iFrame is pretty easy and does not even require a page refresh and about 0 line of code on the front-end, obviously you won’t get a progress bar but does it really matter?

Honesty hour confession: file uploading within the web browser sucks. It just does. Like the ugly SELECT element, the file input is almost unstylable and looks different on different platforms. Add to those criticism the fact that we're all used to drag and drop operations, yet up until recently, you couldn't drag files into a browser to upload them, making file uploading within the browser unintuitive. With recent advancements in browser technology, the drag and drop method is not supported, but it doesn't look good without a bit of work. Luckily MooTools Core Developer Arian Stolwijk has created a set of classes to accommodate styling drag and drop file uploading within the browser. Let's have a look at how it works!

Because is very useful and powerful, it is considered as a standard approach to design modern web-applications.Using Ajax you can develop interactive solutions for lightboxes, form validation, search, tooltips, navigation and tables. Always keep in mind its drawback in terms of usability and accessibility. Extensive Ajax means that you can easily confuse your visitors giving them to much control and features.