html += '<input type="text" name="product_barcode" id="product_barcode"  placeholder="barcode" class="form-control" />';
        html += '</div>';
    '''

$(document).on('change','#product_barcode',function(){
     var barcode = document.getElementById('product_barcode').value;

           $.ajax({
                                url:"barcode_action.php",
                method:"POST",
                data:{barcode:barcode},
                dataType:"json",
                success:function(data)
                {

   var data1=(JSON.stringify(data.product_name));
   var data2=(JSON.stringify(data.price));
   data1=data1.split('"').join('');
   data2=data2.split('"').join('');
    $('#product_info input[name="product_name[]"]').val(data1);
    $('#product_info  input[name="price[]"]').val(data2);

                }
                    })  ;
});