added url param to specify intial zoom vehicle

Author: rossengeorgiev

js/app.js

@@ -20,7 +20,8 @@ var embed = {
     vlist: true,
     graph: true,
     graph_exapnded: false,
-    latestonly: is_mobile
+    latestonly: is_mobile,
+    focus: ""
 }
 var params = window.location.search.substring(1).split('&');
 
@@ -36,6 +37,7 @@ for(var idx in params) {
         case "filter": vfilter = line[1]; break;
         case "nyan": nyan_mode = true; break;
         case "latestonly": embed.latestonly = (parseInt(line[1]) == 1) ? true : false; break;
+        case "focus": embed.focus = line[1]; break;
     }
 }
 

js/tracker.js

@@ -1915,7 +1915,12 @@ function update(response) {
 function zoom_on_payload() {
     // find a the first balloon
     var i = -1, ii = vehicles.length;
-    while(++i < ii) if(vehicles[i].vehicle_type == "balloon") break;
+
+    if(embed.focus != "" && vehicle_names.indexOf(embed.focus) > -1) {
+        i = vehicle_names.indexOf(embed.focus);
+    } else {
+        while(++i < ii) if(vehicles[i].vehicle_type == "balloon") break;
+    }
 
     if(i == ii) return;
     else if(vehicles[i].num_positions > 1) {