Mercurial > urweb

diff lib/js/urweb.js @ 726:6fc633d990e7

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onError
author Adam Chlipala <adamc@hcoop.net>
date Thu, 16 Apr 2009 12:36:01 -0400
parents a5d8b470d7ca
children 2197f0e24a9f
line wrap: on
line diff
--- a/lib/js/urweb.js	Thu Apr 16 12:07:21 2009 -0400
+++ b/lib/js/urweb.js	Thu Apr 16 12:36:01 2009 -0400
@@ -250,6 +250,18 @@
   whine("Pattern match failure");
 }
 
+var errorHandlers = null;
+
+function onError(f) {
+  errorHandlers = cons(f, errorHandlers);
+}
+
+function er(s) {
+  for (var ls = errorHandlers; ls; ls = ls.next)
+    ls.data(s)(null);
+  throw s;
+}
+
 
 // Remote calls