From 33edba2c9adf4848c1e5953e640bd3c1d7c60c12 Mon Sep 17 00:00:00 2001
From: Matthias BUSSONNIER <bussonniermatthias@gmail.com>
Date: Fri, 27 Jul 2012 23:42:38 +0200
Subject: [PATCH] warn on error when user display javascript

---
 .../frontend/html/notebook/static/js/outputarea.js | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/IPython/frontend/html/notebook/static/js/outputarea.js b/IPython/frontend/html/notebook/static/js/outputarea.js
index dcd2123a6..9618a6e14 100644
--- a/IPython/frontend/html/notebook/static/js/outputarea.js
+++ b/IPython/frontend/html/notebook/static/js/outputarea.js
@@ -360,7 +360,19 @@ var IPython = (function (IPython) {
         container.hide();
         // If the Javascript appends content to `element` that should be drawn, then
         // it must also call `container.show()`.
-        eval(js);
+        try {
+            eval(js);
+        } catch(err) {
+            console.log('Error in Javascript!');
+            console.log(err);
+            container.show();
+            element.append($('<div/>')
+                .html("Error in Javascript !<br/>"+
+                    err.toString()+
+                    '<br/>See your browser Javascript console for more details.')
+                .addClass('js-error')
+                );
+        }
     }