jQuery Validation at least one checkbox is selected

Answer 1

Try with this

$("#YourbuttonId").click(function(){
    if($('input[type=checkbox]:checked').length == 0)
    {
        alert('Please select atleast one checkbox');
    }
});

By Plugin

HTML

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Script

rules:{
     "spamm[]": { 
      required: true, 
      minlength: 1 
      }
   }