1. Checks if a username is available or not (in the database). 2. If the username is available, the program will output “[your_username] is available!” 3. Then if it is not available, “Username already taken” will be printed. 4. This code also has a simple validation that states whether the inputted username is too short or is empty.
All those tasks will be performed via AJAX, so it is without page refresh. You can expand its validation though.
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