error handling for profile upload

css/style.css

@@ -60,7 +60,10 @@ div.elevation {
     line-height: 1.4em;
 }
 .hint {
-    color: orangered;
+    color: orange;
+}
+.error {
+    color: red;
 }
 
 .heading {

index.html

@@ -19,7 +19,6 @@
     <div id="map"></div>
 
     <div id="message" class="info hidden">
-        <span class="hint">Requires a local desktop installation of BRouter</span><br>
     </div>
     <div id="header" class="hidden">
         <div class="title"><span class="title-name">BRouter web</span>&nbsp;&nbsp;<sup class="version">alpha2</sup></div>

js/index.js

@@ -94,6 +94,21 @@
 
         router = L.bRouter(); //brouterCgi dummyRouter
 
+        function showError(err) {
+            var ele =L.DomUtil.get('message');
+            ele.innerText = err;
+            L.DomUtil.removeClass(ele, 'hidden');
+            L.DomUtil.addClass(ele, 'error');
+        }
+
+        function hideError() {
+            var ele =L.DomUtil.get('message');
+            if (!L.DomUtil.hasClass(ele, 'hidden')) {
+                L.DomUtil.addClass(ele, 'hidden');
+                ele.innerText = '';
+            }
+        }
+
         function updateRoute(evt) {
             router.setOptions(evt.options);
             routing.rerouteAllSegments(onUpdate);
@@ -114,12 +129,22 @@
         elevation = new BR.Elevation();
         profile = new BR.Profile();
         profile.on('update', function(evt) {
+            hideError();
             var profileId = routingOptions.getCustomProfile();
-            router.uploadProfile(profileId, evt.profileText, function(profile) {
+            router.uploadProfile(profileId, evt.profileText, function(err, profile) {
+                if (!err) {
                     routingOptions.setCustomProfile(profile);
+                } else {
+                    showError(err);
+                    if (profile) {
+                        routingOptions.setCustomProfile(profile, true);
+                        router.setOptions(routingOptions.getOptions());
+                    }
+                }
             });
         });
         profile.on('clear', function(evt) {
+            hideError();
             routingOptions.setCustomProfile(null);
         });
 

js/router/BRouter.js

@@ -103,19 +103,24 @@ L.BRouter = L.Class.extend({
 
         xhr.open('POST', url, true);
         xhr.onload = L.bind(this._handleProfileResponse, this, xhr, cb);
+        xhr.onerror = function(evt) {
+            var xhr = this;
+            cb('Upload error: ' + xhr.statusText);
+        };
 
         // send profile text only, as text/plain;charset=UTF-8
         xhr.send(profileText);
     },
 
     _handleProfileResponse: function(xhr, cb) {
-        var profile;
+        var response,
+            profile;
 
         if (xhr.status === 200 && xhr.responseText && xhr.responseText.length > 0) {
-            // e.g. profileid=1400498280259
-            profile = xhr.responseText.split('=')[1];
-
-            cb(profile);
+            response = JSON.parse(xhr.responseText);
+            cb(response.error, response.profileid);
+        } else {
+            cb('Profile error: no or empty response from server');
         }
     },