Fix issue http://dartbug.com/2342 by checking document.readyState

frog/gen.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /**
  * Top level generator object for writing code and keeping track of
  * dependencies.
  *
  * Should have two compilation models, but only one implemented so far.
  *
@@ skipping 104 matching lines @@
     writeTypes(main.declaringType.library);
 
     // Write out any inherited concrete members.
     // TODO(jmesserly): this won't need to come last once we are sorting types
     // correctly.
     if (_mixins != null) writer.write(_mixins.text);
 
     writeDynamicDispatchMetadata();
 
     writeGlobals();
-    writer.writeln("if (typeof window != 'undefined' && window.addEventListener) {");
+    writer.writeln("if (typeof window != 'undefined' && typeof document != 'undefined' &&");
+    writer.writeln("    window.addEventListener && document.readyState == 'loading') {");
     writer.writeln("  window.addEventListener('DOMContentLoaded', function(e) {");
     writer.writeln("    ${mainCall.code};");
     writer.writeln("  });");
     writer.writeln("} else {");
     writer.writeln("  ${mainCall.code};");
     writer.writeln("}");
   }
 
   void markLibrariesUsed(List<Library> libs) =>
     getAllTypes(libs).forEach(markTypeUsed);
@@ skipping 2391 matching lines @@
     return true;
   }
 
 }
 
 class ReturnKind {
   static final int IGNORE = 1;
   static final int POST = 2;
   static final int PRE = 3;
 }