This is how I did it with Jquery - not sure if there is a better way.
$( document ).ready(function() {
$('#worksheetsgen > tbody > tr').each(function() {
var filename = $(this).find('td.column_worksheetattachment').text();
var foldername = $(this).find('td.column_id').text();
$(this).find('td.column_worksheetattachment').replaceWith ('<img style="width:100px;" src="/idtapps/web/client/app/assessments/1/form/download/worksheet/' +foldername + '/' + filename + '.">');
//end worksheetsgenlist loop
});
//end doc ready
});
WHERE THE FOLLOWING: - #worksheetsgen is the id of my datalist - td.column_worksheetattachment holds the image upload filename - td.column_id has the row id column