Thank you! I realised it using array, which I transferred in JS, like that:
subcategoryArr = '['
    for row in rows:
        subcategoryArr += '[' + str(row.id) + ',' + str(row.ID_CATEGORY) + 
'],'
    subcategoryArr = subcategoryArr[0:-1]+']'
where row.id is ID of my subcategory.
And JS:
$(function() {
 for (var k = 0; k < $("#recipes_ID_SUBCATEGORY")[0].childNodes.length; k++) 
{
 $($("#recipes_ID_SUBCATEGORY")[0].childNodes[k]).css('display', 'none');
 }
 
 for (var i = 0; i < subcategory.length; i++) {
 if (subcategory[i][1]==$("#category").val()) { 
 for (var k = 0; k < $("#recipes_ID_SUBCATEGORY")[0].childNodes.length; k++) 
{
 if ($($("#recipes_ID_SUBCATEGORY")[0].childNodes[k]).val() == subcategory[i
][0]) {
 $($("#recipes_ID_SUBCATEGORY")[0].childNodes[k]).css('display', 'block');
 }
 }
 }
 }
 
 $("#category").on("change", function(){
 //hide all
 for (var k = 0; k < $("#recipes_ID_SUBCATEGORY")[0].childNodes.length; k++) 
{
 $($("#recipes_ID_SUBCATEGORY")[0].childNodes[k]).css('display', 'none');
 }
 
 for (var i = 0; i < subcategory.length; i++) {
 if (subcategory[i][1]==$("#category").val()) { 
 for (var k = 0; k < $("#recipes_ID_SUBCATEGORY")[0].childNodes.length; k++) 
{
 if ($($("#recipes_ID_SUBCATEGORY")[0].childNodes[k]).val() == subcategory[i
][0]) {
 $($("#recipes_ID_SUBCATEGORY")[0].childNodes[k]).css('display', 'block');
 }
 }
 }
 }
 });
});



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