Several websites including Facebook have implemented this mechanism of password recovery. Just before the user opts in to recover a forgotten password, the system shows a snapshot of the profile details based on the user's provided username or email id. This mechanism creates a fantastic user experience and also enhances the UI appearance. I have implemented this with the help of PHP script.
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From any HTML (or XHTML, PHP) page, query the database without reloading the current page or navigating away. Using AJAX call from JQuery and PHP at the backend, create a streamlined system that takes in a user's input and instantly validates it with entries in the database. If found to be duplicate, instantly shows error while the user is still typing. Thus, creating a very interactive interface design and friendly for the end-users.
This script collects user entered string, calculates and instantly updates results to show how many characters were entered. Further, it also calculates the number of alphabets, numbers and spaces. Each time a key is pressed, the process iterates. So, updating is real time.
This code helps you send emails with the help of JQuery POST method and AJAX calls.
This piece of code directs you how to change instantly the image that is being currently displayed to some other predefined image of your choice. This predefined image can be in the form of a URI or can be fetched from database using the JQuery GET or POST methods. Ultimately the code uses the image path to replace the existing displaying image with a new one.