Safeguard against IE6/7 event access exceptions.

codemirror · Jun 21, 2011 · 962ed7a · 962ed7a
1 parent e03eb0b
commit 962ed7a
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/lib/codemirror.js b/lib/codemirror.js
@@ -1131,7 +1131,9 @@ var CodeMirror = (function() {
     function paddingLeft() {return lineSpace.offsetLeft;}
 
     function posFromMouse(e, liberal) {
-      var offW = eltOffset(scroller, true), x = e.e.clientX, y = e.e.clientY;
+      var offW = eltOffset(scroller, true), x, y;
+      // Fails unpredictably on IE[67] when mouse is dragged around quickly.
+      try { x = e.e.clientX; y = e.e.clientY; } catch (e) { return null; }
       // This is a mess of a heuristic to try and determine whether a
       // scroll-bar was clicked or not, and to return null if one was
       // (and !liberal).