Merge pull request #24 from csc301-winter-2019/feat/8

Add live updates functionality

1 files changed, 36 insertions, 10 deletions

diff --git a/web/public/javascripts/map.js b/web/public/javascripts/map.js
index 190307d..4b8b8f3 100644
--- a/web/public/javascripts/map.js
+++ b/web/public/javascripts/map.js
@@ -3,6 +3,18 @@
 //     attribution: '&copy; <a href="http://osm.org/copyright">OpenStreetMap</a> contributors'
 // }).addTo(map);
 
+function plotPointsOnMap(points) {
+	L.geoJson(points, {
+		pointToLayer: function (feature, latlng) {
+			//return L.circleMarker(latlng);
+			return L.marker(latlng);
+		}
+	}).bindPopup(function (layer) {
+		// layer.feature.geometry gives you access to all the fields
+		return "<p>" + JSON.stringify(layer.feature.geometry) + "</p>";
+	}).addTo(map)
+}
+
 // different basemap
 L.tileLayer('https://stamen-tiles-{s}.a.ssl.fastly.net/toner-lite/{z}/{x}/{y}{r}.{ext}', {
 	attribution: 'Map tiles by <a href="http://stamen.com">Stamen Design</a>, <a href="http://creativecommons.org/licenses/by/3.0">CC BY 3.0</a> &mdash; Map data &copy; <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a> contributors',
@@ -11,13 +23,27 @@ L.tileLayer('https://stamen-tiles-{s}.a.ssl.fastly.net/toner-lite/{z}/{x}/{y}{r}
 	maxZoom: 18,
 	ext: 'png'
 }).addTo(map);
-
-L.geoJson(points, {
-	pointToLayer: function (feature, latlng) {
-		//return L.circleMarker(latlng);
-		return L.marker(latlng);
-	}
-}).bindPopup(function (layer) {
-	// layer.feature.geometry gives you access to all the fields
-	return "<p>" + JSON.stringify(layer.feature.geometry) + "</p>";
-}).addTo(map)
+plotPointsOnMap(points);
+if (window.EventSource) {
+	var source = new EventSource('/stream');
+  
+	source.addEventListener('message', function(e) {
+		var data = JSON.parse(e.data);
+		if (data.coordinates) {
+			points.push(data);
+			plotPointsOnMap(points);
+		}
+	}, false)
+  
+	source.addEventListener('open', function(e) {
+	  console.log("Connection was opened")
+	}, false)
+  
+	source.addEventListener('error', function(e) {
+	  if (e.readyState == EventSource.CLOSED) {
+		console.log("Connection was closed")
+	  }
+	}, false)
+} else {
+	console.log("sse not supported.");
+}