How to reload or re-attach javascritp file to current web page after ajax request

I created a custom jquery file in a front accounting software to arrange items/products on invoice in ascending order, after adding the first product line being arranged in ascending order, my custom code just got release or detached itself from the invoice page, so the rest of the product lines would not be arranged in ascending order. so i need help on how to make my custom code persistent to the entire life of the page.