From f189201ee04ce61f517167eb847c8262c2d5ea5c Mon Sep 17 00:00:00 2001
From: Danny Yoo <dyoo@cs.wpi.edu>
Date: Mon, 26 Sep 2011 15:11:38 -0400
Subject: [PATCH] trying to make the code more robust to things like
 watchPosition erroring out when enableHighAccuracy is set to true.

---
 web-world/js-impl.js | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/web-world/js-impl.js b/web-world/js-impl.js
index c74c353..738424f 100644
--- a/web-world/js-impl.js
+++ b/web-world/js-impl.js
@@ -949,6 +949,7 @@
     LocationEventSource.prototype = plt.baselib.heir(EventSource.prototype);
 
     LocationEventSource.prototype.onStart = function(fireEvent) {
+        var that = this;
         if (this.id === undefined) {
             var success = function(position) {
                 if (position.hasOwnProperty &&
@@ -961,6 +962,14 @@
                                               'longitude' : Number(position.coords.longitude) }));
                 }
             };
+            // If we fail while trying to watch the position
+            // using high accuracy, switch over to the coarse one.
+            var onFailSwitchoverToCoerse = function() {
+                navigator.geolocation.clearWatch(that.id);
+                that.id = navigator.geolocation.watchPosition(
+                    success,
+                    fail);
+            };
             var fail = function(err) {
                 // Quiet failure
             };
@@ -968,7 +977,7 @@
                 navigator.geolocation.getCurrentPosition(success, fail);
                 this.id = navigator.geolocation.watchPosition(
                     success,
-                    fail,
+                    onFailSwitchoverToCoerse,
                     { enableHighAccuracy : true }); 
             }
         }