The entire page acts as a drop target. Drag a file anywhere on this page
to trigger the upload. A visible overlay confirms the drop zone is active.
What you should see: the entire page is the drop target - drag a file anywhere in the window and it joins the queue.
Drop files to upload
AjaxUploader.create(el, {
uploadUrl: '/ajaxupload.axd/upload',
multiple: true,
autoUpload: true,
dropTarget: document.documentElement
});
// Overlay shows on dragenter, hides on dragleave/drop
document.addEventListener('dragenter', showOverlay);
document.addEventListener('drop', hideOverlay);