gistfile1.txt

$(document).ready(function() {
	$("select[id*='id_products-']").css("width", "145px");
	
	function getSizeSelectField()
    {
		product_type = $("#id_product_type").val();
		fields = $("select[id*='-size']").serializeArray();
		$("select[id*='-size']").load('{% url shop.views.getSelectField %}' + '?type=size&object_id=' + product_type,
			function() {
				$.each(fields, function(i, field) {
					name = "#id_" + field.name
					$(name).val(field.value);
					if ($(name).val() == null)
					{
						$(name).val("")
					}
      			});
			})
    }

    $("#id_product_type").change(getSizeSelectField);
})