AJAX MYSQL Database Example | 100% Practical

AJAX MYSQL Database Example | 100% Practical
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The showCustomer() function does the following:
Description-
Check if a customer is selected
Create an XMLHttpRequest object
Create the function to be executed when the server response is ready
Send the request off to a file on the server
Notice that a parameter (q) is added to the URL (with the content of the dropdown list)
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