Question

Markup:
   <div class="modal-body">
      <p>One fine body…</p>
   </div>

Why isn’t this help?

$(".modal-body").val = data_per_folder[current_folder.folder_id].data_per_page[current_page].attachment_extraDetails[attachmentId].attachments_markup;

Answer 1

.val() is a method not a property you use it like this:

$(selector).val('new value');

Also .val() changes the attribute value. A div does not have this HTML attribute.

You want to change the innerHTML. Use .html() for that.

$(".modal-body").html('new value');