From e7fdb6e0f6ab265f3cd850d3663a91b531de8ba8 Mon Sep 17 00:00:00 2001
From: Adam Chlipala <adamc@hcoop.net>
Date: Sun, 15 Feb 2009 11:33:53 -0500
Subject: Detect AJAX call failures

---
 lib/js/urweb.js | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

(limited to 'lib/js/urweb.js')

diff --git a/lib/js/urweb.js b/lib/js/urweb.js
index 9dd4dbbe..bfca94a4 100644
--- a/lib/js/urweb.js
+++ b/lib/js/urweb.js
@@ -133,8 +133,19 @@ function rc(uri, k) {
   var xhr = getXHR();
 
   xhr.onreadystatechange = function() {
-    if (xhr.readyState == 4)
-      k(xhr.responseText);
+    if (xhr.readyState == 4) {
+      var isok = false;
+
+      try {
+        if (xhr.status == 200)
+          isok = true;
+      } catch (e) { }
+
+      if (isok)
+        k(xhr.responseText);
+      else
+        alert("Error querying remote server!");
+    }
   };
 
   xhr.open("GET", uri, true);
-- 
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