diff --git a/misc/tabledrag.js b/misc/tabledrag.js
index 3cc2701..5d423a5 100644
--- a/misc/tabledrag.js
+++ b/misc/tabledrag.js
@@ -782,7 +782,7 @@ Drupal.tableDrag.prototype.updateField = function (changedRow, group) {
             else {
               this.value = maxVal;
             }
-          });
+          }).trigger('change');
         }
         else {
           // Assume a numeric input field.
@@ -790,7 +790,7 @@ Drupal.tableDrag.prototype.updateField = function (changedRow, group) {
           $(targetClass, siblings).each(function () {
             this.value = weight;
             weight++;
-          });
+          }).trigger('change');
         }
         break;
     }