How to make select2 work with jquery.validation plugin?

Question

I\'m trying to validate select2 field using jquey.validation plugin but nothing happens.

I want to make select required field.

I\'m using this custom validat

Answer 1

To validate 'select2' inputs you first must tell jquery validate to consider hidden elements:

$.validator.setDefaults({ 
ignore: [],
});

This is custom highlight / unhighlight that i use for pointing select2 and tagit errors with jquery validate:

$("#someform").validate({
        rules: {
            nazwa: {
                required: true
            },
            ilosc_w_opakowaniu: {
                required: "#czy_opakowanie_zbiorcze:checked"
            }
        },
        messages: {
            nazwa: "Musisz wypełnić pole [Nazwa]",
            ilosc_w_opakowaniu: "Musisz podać ilość produktu w opakowaniu zbiorczym",
        },

        highlight: function( element, errorClass, validClass ) {
            if ( element.type === "radio" ) {
                this.findByName( element.name ).addClass( errorClass ).removeClass( validClass );
            } else {
                $( element ).addClass( errorClass ).removeClass( validClass );
            }

            // select2
            if( $(element).hasClass('select2-hidden-accessible') ){
                dzik = $(element).next('span.select2');
                if(dzik)
                    dzik.addClass( errorClass ).removeClass( validClass );
            }

            // tagit
            dzik2 = $(element).parent().find('ul.tagit') 
            if( dzik2.length == 1 )
                dzik2.addClass( errorClass ).removeClass( validClass );

        },
        unhighlight: function( element, errorClass, validClass ) {
            if ( element.type === "radio" ) {
                this.findByName( element.name ).removeClass( errorClass ).addClass( validClass );
            } else {
                $( element ).removeClass( errorClass ).addClass( validClass );
            }

            // select2
            if( $(element).hasClass('select2-hidden-accessible') ){
                dzik = $(element).next('span.select2');
                if(dzik)
                    dzik.removeClass( errorClass ).addClass( validClass );
            }

            // tagit
            dzik2 = $(element).parent().find('ul.tagit') 
            if( dzik2.length == 1 )
                dzik2.removeClass( errorClass ).addClass( validClass );
        }
     });

And some CSS:

/** select2 error hightight **/
.select2.error .select2-selection--single{
    border-color:red !important;
    color:red !important;
}

/** tagit error highlight **/
.tagit.error{
   border-color:red !important;
   color:red !important;
}