Limit Number of Checkboxes Checked

Question

I have a form with several checkboxes. I have three categories of checkboxes in the form. I need to limit to a max of three checkboxes per category.

I used

Answer 1

just add a class to all the related check boxes, and just use the class selector when checking the checkboxes for a category. eg:

HTML

Cat 1




Cat 2



...

JS

jQuery(function(){
   var max = 3;

   var cat1_checkboxes = jQuery('input.cat1[type="checkbox"]');
   var cat2_checkboxes = jQuery('input.cat2[type="checkbox"]');
   var cat3_checkboxes = jQuery('input.cat3[type="checkbox"]');


   cat1_checkboxes.change(function(){
      var current = cat1_checkboxes.filter(':checked').length;
       checkboxes.filter(':not(:checked)').prop('disabled', current >= max);
   });

   cat2_checkboxes.change(function(){
      var current = cat2_checkboxes.filter(':checked').length;
       checkboxes.filter(':not(:checked)').prop('disabled', current >= max);
   });

   cat3_checkboxes.change(function(){
      var current = cat3_checkboxes.filter(':checked').length;
       checkboxes.filter(':not(:checked)').prop('disabled', current >= max);
   });

});