js-tygh-file_uploader.js.diff

diff --git a/js/tygh/file_uploader.js b/js/tygh/file_uploader.js
index b14be17..d9947e5 100644
--- a/js/tygh/file_uploader.js
+++ b/js/tygh/file_uploader.js
@@ -36,7 +36,9 @@
             value: function () {
                 for (var i = 0; i < this.length; i++) {
                     if (this[i].image_type === 'M') {
-                        return this[i]; } }
+                        return this[i];
+                    }
+                }
 
                 return false;
             },
@@ -453,6 +455,7 @@
                 }
                 self.refreshPreview(addedFile);
                 self.registerCustomRemoveEvent(addedFile);
+                self.registerCustomAltUpdateEvent(addedFile);
                 self.expandAltTextarea(addedFile);
             });
         },
@@ -608,6 +611,15 @@
             });
         },
 
+        registerCustomAltUpdateEvent: function (file) {
+            var self = this;
+
+            $(file.previewElement).find('.file-uploader__file-description-input').on('keyup', function () {
+                file.dynamicData['alt-text-detailed'].value = $(this).val();
+                self.refreshPreview(file);
+            });
+        },
+
         refreshPreview: function (previewFile) {
             if ('dynamicData' in previewFile) {
                 var self = this;