How to retrieve values of a checked checkbox in datatables pagination using javascript?

I have been using datatables for my project and only I discovered recently that the javascript I used is only selecting the checkboxes in the current page. Values of checked checkbox in other pagination/page is not selected or retrieved. Is there a way I can recognize checked checkboxes in all page of a pagination? Please help. Here is my code.

$('#create-po').click(function(e){     
    e.preventDefault();

     $("input:checkbox:checked").each(function(i){
       valArray[i] = $(this).val();
     });

 });

This code recognizes checked checkboxes in a current page but not recognizes checked checkboxes in other page.