Extract img URL from a drag-and-dropped image from another website

- https://stackoverflow.com/a/19268449

InvenTree/part/templates/part/part_base.html

@@ -106,10 +106,9 @@
 
         var transfer = event.originalEvent.dataTransfer;
 
-        var files = transfer.files;
+        if (isFileTransfer(transfer)) {
 
-        if (files.length > 0) {
+            var file = transfer.files[0];
-            var file = files[0];
     
             inventreeFileUpload(
                 "{% url 'part-image-upload' part.id %}",
@@ -124,6 +123,18 @@
                     }
                 }
             );
+        } else if (isOnlineTransfer(transfer)) {
+
+            getImageUrlFromTransfer(transfer);
+            /*
+            for (var i = 0; i < 12; i++) {
+                transfer.items[i].getAsString(function(text) {
+                    console.log('item ' + i + ' - ' + text);
+                });
+            }
+            */
+        } else {
+            console.log('Unknown transfer');
         }
 
     });

InvenTree/static/script/inventree/inventree.js

@@ -36,3 +36,27 @@ function inventreeDocReady() {
         modal.modal('show');
     });
 }
+
+function isFileTransfer(transfer) {
+    /* Determine if a transfer (e.g. drag-and-drop) is a file transfer 
+     */
+
+    return transfer.files.length > 0;
+}
+
+
+function isOnlineTransfer(transfer) {
+    /* Determine if a drag-and-drop transfer is from another website.
+     * e.g. dragged from another browser window
+     */
+
+    return transfer.items.length > 0;
+}
+
+
+function getImageUrlFromTransfer(transfer) {
+    /* Extract external image URL from a drag-and-dropped image
+     */
+
+    console.log(transfer.getData('text/html').match(/src\s*=\s*"(.+?)"/)[1]);
+}