Merge pull request novnc#713 from kanaka/properdisconnections

Better error handling

app/styles/base.css

@@ -172,6 +172,43 @@ input[type=button]:active, select:active {
   pointer-events: auto;
 }
 
+/* ----------------------------------------
+ * Fallback error
+ * ----------------------------------------
+ */
+
+#noVNC_fallback_error {
+  position: fixed;
+  z-index: 3;
+  left: 50%;
+  transform: translate(-50%, -50px);
+  transition: 0.5s ease-in-out;
+
+  visibility: hidden;
+  opacity: 0;
+
+  top: 60px;
+  padding: 15px;
+  width: auto;
+
+  text-align: center;
+  font-weight: bold;
+  word-wrap: break-word;
+  color: #fff;
+
+  border-radius: 10px;
+  box-shadow: 6px 6px 0px rgba(0, 0, 0, 0.5);
+  background: rgba(200,55,55,0.8);
+}
+#noVNC_fallback_error.noVNC_open {
+  transform: translate(-50%, 0);
+  visibility: visible;
+  opacity: 1;
+}
+#noVNC_fallback_errormsg {
+  font-weight: normal;
+}
+
 /* ----------------------------------------
  * Control Bar
  * ----------------------------------------

app/ui.js

@@ -25,6 +25,21 @@ var UI;
 (function () {
     "use strict";
 
+    // Fallback for all uncought errors
+    window.addEventListener('error', function(msg, url, line) {
+        try {
+            document.getElementById('noVNC_fallback_error')
+                .classList.add("noVNC_open");
+            document.getElementById('noVNC_fallback_errormsg').innerHTML =
+                url + ' (' + line + ') <br><br>' + msg;
+        } catch (exc) {
+            document.write("noVNC encountered an error.");
+        }
+        // Don't return true since this would prevent the error
+        // from being printed to the browser console.
+        return false;
+    });
+
     /* [begin skip-as-module] */
     // Load supporting scripts
     WebUtil.load_scripts(