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diff lib/js/urweb.js @ 800:e92cfac1608f

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Proper lifting of MonoEnv stored expressions; avoidance of onchange clobbering
author Adam Chlipala <adamc@hcoop.net>
date Thu, 14 May 2009 13:18:31 -0400
parents 83875a9eb9b8
children c1f8963ebb18
line wrap: on
line diff
--- a/lib/js/urweb.js	Thu May 14 11:04:56 2009 -0400
+++ b/lib/js/urweb.js	Thu May 14 13:18:31 2009 -0400
@@ -301,11 +301,19 @@
   return x;
 }
 
+function addOnChange(x, f) {
+  var old = x.onchange;
+  x.onchange = function() { old(); f (); };
+}
+
 
 // Basic string operations
 
 function eh(x) {
-  return x.split("&").join("&amp;").split("<").join("&lt;").split(">").join("&gt;");
+  if (x == null)
+    return "NULL";
+  else
+    return x.split("&").join("&amp;").split("<").join("&lt;").split(">").join("&gt;");
 }
 
 function ts(x) { return x.toString() }