Required field validation is not working properly

Question

I have create a multiselect form but the required field validation is not working. Please guide me how can i fix this problem.
code: https://code.sololearn.com/WQWLYeefqHB5

Answer 1

line 456: <script type='text/javascript'>

this script tag has no closing tag... and anyway, is of none use... delete it, and your javascript will run without complaining (looks like it works as expected for the fiels validation, but you have some php code inside your html wich could be problematic if you didn't serve your file from a php backend ^^)

Answer 2

Unfortunately I will add this code on wordpress so need to done in php