getElemntbyid returns undefined value

Using of jQuery and other libs will not help if the element with this ID is not exists.

Using jQuery, you can check whether the element exist.

Code:

if($('#texttwo_'+rowid).length)
{
    // Do code
}

I always do that check when I'm using DataTables or some other JS plugins. I first check if that table exists, then if yes, I initialize DT to that table. It always works for me.

Edit:
By the way, the code above will only return 0 or 1 (true or false equivalents) so no need to do if($('#texttwo_'+rowid).length > 0)
Correct me if I'm wrong.