If max number of student exceeded in the class

If max number of student exceeded in the class


I have a Form named as add_class
1. school_name   (lookup field) from Form school_master 
2. program_name  (single line field)
3. max_student   (number field) 
4. start_date        (date field)
5. end_date         (date field)

And in my website there is Form named as Registration. Which have many different fields including
school_name, program_name, start_date and end_date .

what i need is when the max_student value exceeded for that particular program_name in that school_name then nobody can submit more entry in Registration Form in website , instead if anybody fill and submit Registration Form then it shows alert or popup to them that class is full can not add more.

And also if the start_date is zoho.currentDate  then no one able to fill the Registration Form , shows alert or popup again as same.

Note:- In one particular school_name there will be many program_name And for every program_name the value of max_student is different .

How can i achieve this ?  Thanks in advance for your help !!

    Zoho Pagesense Resources

        Zoho SalesIQ Resources

              Zoho TeamInbox Resources

                Zoho DataPrep Resources

                    Zoho CRM Plus Resources

                      Zoho Books Resources

                        Zoho Subscriptions Resources

                          Zoho Desk Resources

                            Zoho Projects Resources

                              Zoho Sprints Resources

                                Qntrl Resources

                                  Zoho Creator Resources

                                    Zoho WorkDrive Resources

                                        Zoho Campaigns Resources

                                          Zoho CRM Resources

                                                      Design. Discuss. Deliver.

                                                      Create visually engaging stories with Zoho Show.

                                                      Get Started Now