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$(function () {
    $('.select2entity').css('width', '100%').select2({
        theme: "bootstrap",
        language: "pl",
        escapeMarkup: function (markup) {
            return markup;
        }
    }).on('select2:select', function (e) {
        var id = e.params.data.id;
        var option = $(e.target).children('[value=' + id + ']');
        option.detach();
        $(e.target).append(option).change();
    });
});