diff --git a/lib/editor/tinymce/lib.php b/lib/editor/tinymce/lib.php
index b0f3bf00a4e..4be37d416c4 100644
--- a/lib/editor/tinymce/lib.php
+++ b/lib/editor/tinymce/lib.php
@@ -167,7 +167,10 @@ class tinymce_texteditor extends texteditor {
                 $params['file_browser_callback'] = "M.editor_tinymce.filepicker";
             }
         }
-
+        //Add onblur event for client side text validation
+        if (!empty($options['required'])) {
+            $params['init_instance_callback'] = 'M.editor_tinymce.onblur_event';
+        }
         return $params;
     }
 }
diff --git a/lib/editor/tinymce/module.js b/lib/editor/tinymce/module.js
index 7db01985456..2754961545d 100644
--- a/lib/editor/tinymce/module.js
+++ b/lib/editor/tinymce/module.js
@@ -72,3 +72,19 @@ M.editor_tinymce.filepicker = function(target_id, url, type, win) {
     });
 };
 
+M.editor_tinymce.onblur_event = function(ed) {
+    //Attach event only after tinymce is intialized.
+    if (ed.onInit != undefined) {
+        var s = ed.settings;
+        //Save before event is attached, so that if this event is not generated then textarea should
+        //have loaded contents and submitting form should not throw error.
+        ed.save();
+
+        //Attach blur event for tinymce to save contents to textarea
+        var doc = s.content_editable ? ed.getBody() : (tinymce.isGecko ? ed.getDoc() : ed.getWin());
+        tinymce.dom.Event.add(doc, 'blur', function() {
+            //save contents to textarea before calling validation script.
+            ed.save();
+        });
+    };
+};
diff --git a/lib/form/editor.php b/lib/form/editor.php
index 6e1f12a2647..eeec855fc5c 100644
--- a/lib/form/editor.php
+++ b/lib/form/editor.php
@@ -86,6 +86,24 @@ class MoodleQuickForm_editor extends HTML_QuickForm_element {
         $this->_options['subdirs'] = $allow;
     }
 
+    /**
+     * Returns editor format
+     *
+     * @return int.
+     */
+    function getFormat() {
+        return $this->_values['format'];
+    }
+
+    /**
+     * Checks if editor used is tinymce and is required field
+     *
+     * @return true if required field.
+     */
+    function isRequired() {
+        return (isset($this->_options['required']) && $this->_options['required']);
+    }
+
     function setHelpButton($_helpbuttonargs, $function='_helpbutton') {
         if (!is_array($_helpbuttonargs)) {
             $_helpbuttonargs = array($_helpbuttonargs);
@@ -198,13 +216,23 @@ class MoodleQuickForm_editor extends HTML_QuickForm_element {
             $fpoptions['link'] = $link_options;
         }
 
+        //If editor is required and tinymce, then set required_tinymce option to initalize tinymce validation.
+        if (($editor instanceof tinymce_texteditor)  && !is_null($this->getAttribute('onchange'))) {
+            $this->_options['required'] = true;
+        }
+
     /// print text area - TODO: add on-the-fly switching, size configuration, etc.
         $editor->use_editor($id, $this->_options, $fpoptions);
 
         $rows = empty($this->_attributes['rows']) ? 15 : $this->_attributes['rows'];
         $cols = empty($this->_attributes['cols']) ? 80 : $this->_attributes['cols'];
 
-        $str .= '<div><textarea id="'.$id.'" name="'.$elname.'[text]" rows="'.$rows.'" cols="'.$cols.'">';
+        //Apply editor validation if required field
+        $editorrules = '';
+        if (!is_null($this->getAttribute('onblur')) && !is_null($this->getAttribute('onchange'))) {
+            $editorrules = 'onblur="'.htmlspecialchars($this->getAttribute('onblur')).'" onchange="'.htmlspecialchars($this->getAttribute('onchange')).'"';
+        }
+        $str .= '<div><textarea id="'.$id.'" name="'.$elname.'[text]" rows="'.$rows.'" cols="'.$cols.'"'.$editorrules.'>';
         $str .= s($text);
         $str .= '</textarea></div>';
 
diff --git a/lib/formslib.php b/lib/formslib.php
index 8e48aff88fe..5e85404842b 100644
--- a/lib/formslib.php
+++ b/lib/formslib.php
@@ -1690,8 +1690,16 @@ class MoodleQuickForm extends HTML_QuickForm_DHTMLRulesTableless {
                             }
                         }
                     }
+                    //for editor element, [text] is appended to the name.
+                    if ($element->getType() == 'editor') {
+                        $elementName .= '[text]';
+                        //Add format to rule as moodleform check which format is supported by browser
+                        //it is not set anywhere... So small hack to make sure we pass it down to quickform
+                        if (is_null($rule['format'])) {
+                            $rule['format'] = $element->getFormat();
+                        }
+                    }
                     // Fix for bug displaying errors for elements in a group
-                    //$test[$elementName][] = $registry->getValidationScript($element, $elementName, $rule);
                     $test[$elementName][0][] = $registry->getValidationScript($element, $elementName, $rule);
                     $test[$elementName][1]=$element;
                     //end of fix
@@ -2374,17 +2382,18 @@ class MoodleQuickForm_Rule_Required extends HTML_QuickForm_Rule {
     /**
      * This function returns Javascript code used to build client-side validation.
      * It checks if an element is not empty.
-     * Note, that QuickForm does not know how to work with editor text field and builds not correct
-     * JS code for validation. If client check is enabled for editor field it will not be validated
-     * on client side no matter what this function returns.
      *
-     * @param     mixed     $options    Not used yet
+     * @param int $format
      * @return array
      */
-    function getValidationScript($options = null) {
+    function getValidationScript($format = null) {
         global $CFG;
         if (!empty($CFG->strictformsrequired)) {
-            return array('', "{jsVar}.replace(/^\s+$/g, '') == ''");
+            if (!empty($format) && $format == FORMAT_HTML) {
+                return array('', "{jsVar}.replace(/(<[^img|hr|canvas]+>)|&nbsp;|\s+/ig, '') == ''");
+            } else {
+                return array('', "{jsVar}.replace(/^\s+$/g, '') == ''");
+            }
         } else {
             return array('', "{jsVar} == ''");
         }