[Answered ]-Django ajax display nothing in for loop

After some discussion, your question is now clear. You must use jQuery change event for your select tag.

Change your script to:

$('.inp select.item').change(function() {
    let elm = $(this);

    $.ajax({
        url:'/ajax/price_validate/',
        data:{
            // elm.attr("name"): elm.val()
            // OR keep it simple
            "item_id": elm.val()
        },
        success:function(data){
            if (data.price){
                elm.closest("div.inp").find("input.price").val(data.price);
            }
            else{
                alert('price doesn't provided')
            }
        }
    })
})

views.py:

@login_required
def check_price(request):
    query = request.GET
    data = {
        'price': Item.objects.get(id=query.get("item_id")).price,
    }
   return JsonResponse(data)