Start work on saving graph controls

assets/js/site.js

@@ -460,9 +460,13 @@ $(document).ready(function() {
             delete hiddenGraphData[serverIp];
         }
 
+        // Redraw the graph
         historyPlot.setData(convertGraphData(displayedGraphData));
         historyPlot.setupGrid();
 
         historyPlot.draw();
+
+        // Update our localStorage
+        saveGraphControls();
     });
 });

assets/js/util.js

@@ -2,6 +2,24 @@ var MISSING_FAVICON_BASE64 = "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAEAA
 
 var tooltip = $('#tooltip');
 
+function saveGraphControls(displayedServers) {
+	if (typeof(localStorage) !== undefined) {
+		var json = JSON.stringify(displayedServers);
+
+		localStorage.setItem('displayedServers', json);
+	}
+}
+
+function loadGraphControls() {
+	if (typeof(localStorage) !== undefined) {
+		var item = localStorage.getItem('displayedServers');
+
+		if (item) {
+			return JSON.parse(item);
+		}
+	}
+}
+
 function getTimestamp(ms, timeOnly) {
     var date = new Date(0);