From 534fc276499ee77ce93f13d4dc6c7ec48493680f Mon Sep 17 00:00:00 2001
From: Ruslan Kabalin <r.kabalin@lancaster.ac.uk>
Date: Tue, 14 Jan 2014 16:12:00 +0000
Subject: [PATCH] MDL-43693: assignment: Fix JS error on grading page.

---
 mod/assign/module.js | 60 +++++++++++++++++++++++---------------------
 1 file changed, 31 insertions(+), 29 deletions(-)

diff --git a/mod/assign/module.js b/mod/assign/module.js
index 29814649434..ba35ef0ddce 100644
--- a/mod/assign/module.js
+++ b/mod/assign/module.js
@@ -65,37 +65,39 @@ M.mod_assign.init_grading_table = function(Y) {
         }
 
         var batchform = Y.one('form.gradingbatchoperationsform');
-        batchform.on('submit', function(e) {
-            checkboxes = Y.all('td.c0 input');
-            var selectedusers = [];
-            checkboxes.each(function(node) {
-                if (node.get('checked')) {
-                    selectedusers[selectedusers.length] = node.get('value');
+        if (batchform) {
+            batchform.on('submit', function(e) {
+                checkboxes = Y.all('td.c0 input');
+                var selectedusers = [];
+                checkboxes.each(function(node) {
+                    if (node.get('checked')) {
+                        selectedusers[selectedusers.length] = node.get('value');
+                    }
+                });
+
+                operation = Y.one('#id_operation');
+                usersinput = Y.one('input.selectedusers');
+                usersinput.set('value', selectedusers.join(','));
+                if (selectedusers.length == 0) {
+                    alert(M.str.assign.nousersselected);
+                    e.preventDefault();
+                } else {
+                    action = operation.get('value');
+                    prefix = 'plugingradingbatchoperation_';
+                    if (action.indexOf(prefix) == 0) {
+                        pluginaction = action.substr(prefix.length);
+                        plugin = pluginaction.split('_')[0];
+                        action = pluginaction.substr(plugin.length + 1);
+                        confirmmessage = eval('M.str.assignfeedback_' + plugin + '.batchoperationconfirm' + action);
+                    } else {
+                        confirmmessage = eval('M.str.assign.batchoperationconfirm' + operation.get('value'));
+                    }
+                    if (!confirm(confirmmessage)) {
+                        e.preventDefault();
+                    }
                 }
             });
-
-            operation = Y.one('#id_operation');
-            usersinput = Y.one('input.selectedusers');
-            usersinput.set('value', selectedusers.join(','));
-            if (selectedusers.length == 0) {
-                alert(M.str.assign.nousersselected);
-                e.preventDefault();
-            } else {
-                action = operation.get('value');
-                prefix = 'plugingradingbatchoperation_';
-                if (action.indexOf(prefix) == 0) {
-                    pluginaction = action.substr(prefix.length);
-                    plugin = pluginaction.split('_')[0];
-                    action = pluginaction.substr(plugin.length + 1);
-                    confirmmessage = eval('M.str.assignfeedback_' + plugin + '.batchoperationconfirm' + action);
-                } else {
-                    confirmmessage = eval('M.str.assign.batchoperationconfirm' + operation.get('value'));
-                }
-                if (!confirm(confirmmessage)) {
-                    e.preventDefault();
-                }
-            }
-        });
+        }
 
         Y.use('node-menunav', function(Y) {
             var menus = Y.all('.gradingtable .actionmenu');