When allowing a user to register a username, you can use AJAX with MooTools to let them check the availability of the username being submitted.
There a many examples of egregious usages of Ajax out there but every once in a while you find a great usage of Ajax. One great usage is the username availability checker. Why make the user submit their form if you can just use Ajax to let them know if it’s available right away? Here’s how you can implement a username available checker using MooTools 1.2.
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