<form autocomplete="off" @submit.prevent="ActualizarPrecioTarifa()">
    <div class="modal fade" tabindex="-1" role="dialog" aria-hidden="true" id="modal_tarifas">
        <div class="modal-dialog" role="document">
            <div class="modal-content">
                <div class="modal-header">
                    <h5 class="modal-title">Lista de tarifas</h5>
                    <button type="button" class="close" data-dismiss="modal" aria-label="Close">
                        <span aria-hidden="true">&times;</span>
                    </button>
                </div>
                <div class="modal-body">
                    <div class="form-group">
                        <label for="tarifas">Tarifas</label>
                        <select id="tarifas" class="form-control" v-model="tarifa">
                            <option :value="0" disabled>SELECCIONE UN ELEMENTO</option>
                            <option v-for="row in lista_tarifas" :value="row.tar_id">{{ row.tar_nombre }}</option>
                        </select>
                    </div>
                </div>
                <div class="modal-footer">
                    <button type="button" class="btn btn-sm btn-secondary" data-dismiss="modal">Cerrar</button>
                    <button type="submit" class="btn btn-sm btn-primary">Actualizar precios</button>
                </div>
            </div>
        </div>
    </div>
</form>