What is the script used for MySQL Ajax tree?

I am giving you a script code which is in a Php language with Ajax and MySql Database.

Go to this link: https://www.w3schools.com/php/php_ajax_database.asp

 

The following example will demonstrate how a web page can fetch information from a database with AJAX.

 

1. The HTML Page: In html page there is a drop down list named 'User' and an event 'onChange'. In script tag there is a function showUser which retrieves the users details.

 

2. PHP File: The page on the server called by the JavaScript above is a PHP file called "getuser.php".

The source code in "getuser.php" runs a query against a MySQL database, and returns the result in an HTML table:

 

When the query is sent from the JavaScript to the PHP file, the following happens:

 

1. PHP opens a connection to a MySQL server

2. The correct person is found

3. An HTML table is created, filled with data, and sent back to the "txtHint" placeholder.