diff --git a/mod/assign/gradingoptionsform.php b/mod/assign/gradingoptionsform.php
index d9abe0fb35a..64201361530 100644
--- a/mod/assign/gradingoptionsform.php
+++ b/mod/assign/gradingoptionsform.php
@@ -48,13 +48,15 @@ class mod_assign_grading_options_form extends moodleform {
         $mform->addElement('header', 'general', get_string('gradingoptions', 'assign'));
         // visible elements
         $options = array(-1=>'All',10=>'10', 20=>'20', 50=>'50', 100=>'100');
-        $mform->addElement('select', 'perpage', get_string('assignmentsperpage', 'assign'), $options, array('class'=>'ignoredirty'));
-        $options = array(''=>get_string('filternone', 'assign'), ASSIGN_FILTER_SUBMITTED=>get_string('filtersubmitted', 'assign'), ASSIGN_FILTER_REQUIRE_GRADING=>get_string('filterrequiregrading', 'assign'));
-        $mform->addElement('select', 'filter', get_string('filter', 'assign'), $options, array('class'=>'ignoredirty'));
+        $mform->addElement('select', 'perpage', get_string('assignmentsperpage', 'assign'), $options);
+        $options = array('' => get_string('filternone', 'assign'),
+                         ASSIGN_FILTER_SUBMITTED => get_string('filtersubmitted', 'assign'),
+                         ASSIGN_FILTER_REQUIRE_GRADING => get_string('filterrequiregrading', 'assign'));
+        $mform->addElement('select', 'filter', get_string('filter', 'assign'), $options);
 
         // quickgrading
         if ($instance['showquickgrading']) {
-            $mform->addElement('checkbox', 'quickgrading', get_string('quickgrading', 'assign'), '', array('class'=>'ignoredirty'));
+            $mform->addElement('checkbox', 'quickgrading', get_string('quickgrading', 'assign'), '');
             $mform->addHelpButton('quickgrading', 'quickgrading', 'assign');
             $mform->setDefault('quickgrading', $instance['quickgrading']);
         }
diff --git a/mod/assign/gradingtable.php b/mod/assign/gradingtable.php
index ad00b800ea4..9e1c9ce7b1e 100644
--- a/mod/assign/gradingtable.php
+++ b/mod/assign/gradingtable.php
@@ -119,7 +119,7 @@ class assign_grading_table extends table_sql implements renderable {
 
         // Select
         $columns[] = 'select';
-        $headers[] = get_string('select') . '<div class="selectall"><input type="checkbox" class="ignoredirty" name="selectall" title="' . get_string('selectall') . '"/></div>';
+        $headers[] = get_string('select') . '<div class="selectall"><input type="checkbox" name="selectall" title="' . get_string('selectall') . '"/></div>';
 
         // Edit links
         if (!$this->is_downloading()) {
@@ -303,7 +303,7 @@ class assign_grading_table extends table_sql implements renderable {
      * @return string
      */
     function col_select(stdClass $row) {
-        return '<input type="checkbox" name="selectedusers" value="' . $row->userid . '" class="ignoredirty"/>';
+        return '<input type="checkbox" name="selectedusers" value="' . $row->userid . '"/>';
     }
 
     /**
diff --git a/mod/assign/module.js b/mod/assign/module.js
index 5786e1e79b4..d01c9b30318 100644
--- a/mod/assign/module.js
+++ b/mod/assign/module.js
@@ -110,27 +110,8 @@ M.mod_assign.init_grading_table = function(Y) {
     });
 };
 
-M.mod_assign.check_dirty_quickgrading_form = function(e) {
-    if (!M.core_formchangechecker.get_form_dirty_state()) {
-        // the form is not dirty, so don't display any message
-        return;
-    }
-
-    // This is the error message that we'll show to browsers which support it
-    var warningmessage = 'There are unsaved quickgrading changes. Do you really wanto to leave this page?';
-
-    // Most browsers are happy with the returnValue being set on the event
-    // But some browsers do not consistently pass the event
-    if (e) {
-        e.returnValue = warningmessage;
-    }
-
-    // But some require it to be returned instead
-    return warningmessage;
-}
 M.mod_assign.init_grading_options = function(Y) {
     Y.use('node', function(Y) {
-
         var paginationelement = Y.one('#id_perpage');
         paginationelement.on('change', function(e) {
             Y.one('form.gradingoptionsform').submit();
@@ -145,28 +126,5 @@ M.mod_assign.init_grading_options = function(Y) {
                 Y.one('form.gradingoptionsform').submit();
             });
         }
-
     });
-
-
-};
-// override the default dirty form behaviour to ignore any input with the class "ignoredirty"
-M.mod_assign.set_form_changed = M.core_formchangechecker.set_form_changed;
-M.core_formchangechecker.set_form_changed = function(e) {
-    var target = e.currentTarget;
-    if (!target.hasClass('ignoredirty')) {
-        M.mod_assign.set_form_changed(e);
-    }
-}
-
-M.mod_assign.get_form_dirty_state = M.core_formchangechecker.get_form_dirty_state;
-M.core_formchangechecker.get_form_dirty_state = function() {
-    var state = M.core_formchangechecker.stateinformation;
-    if (state.focused_element) {
-        if (state.focused_element.element.hasClass('ignoredirty')) {
-            state.focused_element.initial_value = state.focused_element.element.get('value')
-        }
-    }
-    return M.mod_assign.get_form_dirty_state();
-}
-
+};
\ No newline at end of file