<script>
$( document ).ready(function() {
var place='';
var priceSrtelka = {
/*2метра*/ '2': [{"mat1":10400},{"mat2":14600},{"mat3":10800}],
/*4метра*/ '4': [{"mat1":17800},{"mat2":21850},{"mat3":16200}],
/*6метров*/ '6': [{"mat1":24300},{"mat2":29740},{"mat3":22450}],
/*8метров*/ '8': [{"mat1":33200},{"mat2":42350},{"mat3":33890}]
};
$(".tn-atom__form").on('change', 'select[name="length_strelka"]', function() {
place = $(this).val(); //place= $(this)[0].selectedIndex;
if(place==''){place='2'};
$('input[name="material_strelka"]:eq(0)').attr('data-calc-value', priceSrtelka[place][0]['mat1']);
$('input[name="material_strelka"]:eq(1)').attr('data-calc-value', priceSrtelka[place][1]['mat2']);
$('input[name="material_strelka"]:eq(2)').attr('data-calc-value', priceSrtelka[place][2]['mat3']);
$('input[name="material_strelka"]').change();
});
});
</script>