jQuery - how to show message if > 1 checkbox selected?

Question

Depending on the number n of cars a user has in his records, there will be n checkboxes to select from.

In my view these checkboxes are ren

Answer 1

How to show message if > 1 checkbox selected?

You could check the length property of the :checked checkboxes.

if ($('.checkbox:checked').length > 1) { 
   // Show message.
};

jsFiddle.

Also, you could select those checkboxes with :checkbox selector.