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

Try (if your markup matches the one in the fiddle)

jQuery(function(){
    var max = 3;
    var checkboxes = jQuery('input[type="checkbox"]');

    checkboxes.click(function(){
        var $this = $(this);
        var set = $this.add($this.prevUntil('label')).add($this.nextUntil(':not(:checkbox)'));
        var current = set.filter(':checked').length;
        return current <= max;
    });
});

Demo: Fiddle

Update:
Since you have a name for the checkboxes

jQuery(function(){
    var max = 3;
    var checkboxes = jQuery('input[type="checkbox"]');

    checkboxes.click(function(){
        var $this = $(this);
        var set = checkboxes.filter('[name="'+ this.name +'"]')
        var current = set.filter(':checked').length;
        return current <= max;
    });
});

Demo: Fiddle