Notify the user of errors when saving a notebook.

IPython/frontend/html/notebook/static/js/notebook.js

@@ -871,7 +871,8 b' var IPython = (function (IPython) {'
                 type : "PUT",
                 data : JSON.stringify(data),
                 headers : {'Content-Type': 'application/json'},
-                success : $.proxy(this.notebook_saved,this)
+                success : $.proxy(this.notebook_saved,this),
+                error : $.proxy(this.notebook_save_failed,this)
             };
             IPython.save_widget.status_saving();
             $.ajax("/notebooks/" + notebook_id, settings);
@@ -886,6 +887,14 b' var IPython = (function (IPython) {'
     }
 
 
+    Notebook.prototype.notebook_save_failed = function (xhr, status, error_msg) {
+        // Notify the user and reset the save button
+        // TODO: Handle different types of errors (timeout etc.)
+        alert('An unexpected error occured while saving the notebook.');
+        setTimeout($.proxy(IPython.save_widget.reset_status,IPython.save_widget),500);                                                                               
+    }
+
+
     Notebook.prototype.load_notebook = function (callback) {
         var that = this;
         var notebook_id = IPython.save_widget.get_notebook_id();

IPython/frontend/html/notebook/static/js/savewidget.js

@@ -115,6 +115,11 b' var IPython = (function (IPython) {'
     };
 
 
+    SaveWidget.prototype.reset_status = function () {
+        this.is_renaming();
+    };
+
+
     SaveWidget.prototype.status_save = function () {
         this.element.find('button#save_notebook').button('option', 'label', '<u>S</u>ave');
         this.element.find('button#save_notebook').button('enable');