This video shows how you can check class on the single and multiple elements using JavaScript.
0:10 - Create file
0:22 - Create CSS classes
0:52 - Create HTML elements
1:45 - Create JavaScript function
2:44 - Run the project
3:21 - Create another file
3:44 - Create HTML elements
4:33 - Create JavaScript functions
7:05 - Run the project
Read tutorial and download code - https://makitweb.com/check-username-availability-in-postgresql-with-ajax-php/
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