Index: branches/realtime_VDS/cptms/index.html
===================================================================
--- branches/realtime_VDS/cptms/index.html (revision 584)
+++ branches/realtime_VDS/cptms/index.html (revision 585)
@@ -149,4 +149,7 @@
var kCCTVfile = "data_layers/cctv_locations_D12.gjson"; // CCTV locations
var kHARfile = "data_layers/har_locations_D12.gjson"; // CMS locations
+ var lastFetchFile = "last_fetch_time.txt";
+ var fetchInterval = 15;
+ var liveImage = "images/live.svg"
var iconCMSactive = "images/icon_cms_active.png";
var iconCMSidle = "images/icon_cms_idle.png";
@@ -200,4 +203,5 @@
initVDSbutton();
initVDSicons();
+ checkLastFetch();
}
@@ -235,4 +239,6 @@
var harTimer = setInterval(loadAllharMessages, 10000);
+ var fetchTimer = setInterval(checkLastFetch, 10000);
+
// Listen for zoom changes and move the vds dots so as to keep a nice
// visual distance between them appropriate to the zoom factor
Index: branches/realtime_VDS/cptms/js/vdsLayer.js
===================================================================
--- branches/realtime_VDS/cptms/js/vdsLayer.js (revision 584)
+++ branches/realtime_VDS/cptms/js/vdsLayer.js (revision 585)
@@ -160,2 +160,66 @@
}
+//initialize live indicator icon
+function initLiveIcon(success) {
+ //create new img tags for live and not-live indicators
+ var live = document.createElement('img');
+ var notLive = document.createElement('img');
+ live.src ="images/live.svg";
+ live.width = 50 ;
+ live.height= 40 ;
+ notLive.src ="images/fetchError.jpg";
+ notLive.width = 50 ;
+ notLive.height= 50 ;
+ // if fetch is a success, display live img
+ if (success) {
+ console.log(live);
+ if (map.controls[google.maps.ControlPosition.TOP_RIGHT].getLength() > 0)
+ map.controls[google.maps.ControlPosition.TOP_RIGHT].pop();
+ map.controls[google.maps.ControlPosition.TOP_RIGHT].push(live);
+ }
+ // if error, display sad smiley image
+ else {
+ console.log(notLive);
+ if (map.controls[google.maps.ControlPosition.TOP_RIGHT].getLength() > 0)
+ map.controls[google.maps.ControlPosition.TOP_RIGHT].pop();
+ map.controls[google.maps.ControlPosition.TOP_RIGHT].push(notLive);
+ }
+}
+
+//reads first line on last fetch file and checks if its less than 15 minutes old
+function checkLastFetch()
+{
+ var rawFile = new XMLHttpRequest();
+ rawFile.open("GET", lastFetchFile, false);
+ rawFile.onreadystatechange = function ()
+ {
+ if(rawFile.readyState === 4)
+ {
+ if(rawFile.status === 200 || rawFile.status == 0)
+ {
+ var text = rawFile.responseText;
+ // get last fetch time from file
+ var lastFetch = new Date(text);
+ // get current date time
+ var now = new Date();
+ // calculate time difference
+ var msec = now - lastFetch;
+ var days = Math.floor(msec / 1000 / 60 / (60 * 24));
+ msec -= days * 1000 * 60 * 60 * 24
+ var hh = Math.floor(msec / 1000 / 60 / 60);
+ msec -= hh * 1000 * 60 * 60;
+ var mm = Math.floor(msec / 1000 / 60);
+ msec -= mm * 1000 * 60;
+ var ss = Math.floor(msec / 1000);
+ msec -= ss * 1000;
+ // display icon if less than 15
+ if (days === 0 && hh === 0 && mm < fetchInterval)
+ initLiveIcon(1)
+ else
+ initLiveIcon(0)
+ //console.log(days + " Days "+ hh + " Hours " + mm + " Minutes " + ss + " Seconds");
+ }
+ }
+ }
+ rawFile.send(null);
+}
Index: branches/realtime_VDS/cptms/images/live.svg
===================================================================
--- branches/realtime_VDS/cptms/images/live.svg (revision 585)
+++ branches/realtime_VDS/cptms/images/live.svg (revision 585)
@@ -0,0 +1,1 @@
+
Index: branches/realtime_VDS/cptms/images/sad.svg
===================================================================
--- branches/realtime_VDS/cptms/images/sad.svg (revision 585)
+++ branches/realtime_VDS/cptms/images/sad.svg (revision 585)
@@ -0,0 +1,13 @@
+
+
+
+
Index: branches/realtime_VDS/cptms/last_fetch_time.txt
===================================================================
--- branches/realtime_VDS/cptms/last_fetch_time.txt (revision 585)
+++ branches/realtime_VDS/cptms/last_fetch_time.txt (revision 585)
@@ -0,0 +1,1 @@
+03/08/2020 15:48:00