Get all row with ticked checkbox during PreDraw event

I have a datatable with 2 rows:

Select Remark

*Checkbox *Textbox

*Checkbox *Textbox

I have created the event by using PreDraw from DataTable. What I want to achieve is to show alert() of Textbox's content of those selected row.

How can I do that?

What I have tried so far:

table
        .on('preDraw', function () {
            //startTime = new Date().getTime();
            $('#Table input[type="checkbox"]:checked').each(function () {
                checkedids.push("OK");
            });
            console.log(checkedids);
        })
        .on('draw.dt', function () {

        });

The result in console is empty