Loading launch sites from sites.json, and ajax getting site data only when required

predict/index.php

@@ -50,6 +50,7 @@ function initialize() {
     }
 
     initMap(52, 0, 8);
+    populateLaunchSite();
     setupEventHandlers();
     // make launch card draggable
     $("#input_form").draggable({containment: '#map_canvas'});
@@ -134,15 +135,7 @@ No guarantee is given for the accuracy, precision or reliability of the data pro
 	<tr>
 		<td>Launch Site:</td>
 		<td>
-			<select id="site" name="launchsite" onchange="UpdateLaunchSite(this.selectedIndex)">
-				<option value="Churchill">Churchill</option>
-				<option value="EARS">EARS</option>
-				<option value="Glenrothes">Glenrothes</option>
-				<option value="Bujaraloz, Monegros">Bujaraloz, Monegros</option>
-				<option value="Adelaide Airport">Adelaide Airport</option>
-                                <option id="other" value="other"<?php
-                                if ($current_uuid !=0) echo " selected=\"selected\"";
-                                ?>>Other</option>
+			<select id="site" name="launchsite">
 			</select>
 		</td>
 	<tr>

predict/js/pred.js

@@ -75,6 +75,29 @@ function showMousePos(GLatLng) {
     
 }
 
+function populateLaunchSite() {
+    $.getJSON("sites.json", function(sites) {
+        $.each(sites, function(sitename, site) {
+            $("#site").append($('<option></option>').val(sitename).html(sitename));
+        });
+        $("#site").append($('<option></option>').val("Other").html("Other"));
+    });
+}
+
+function changeLaunchSite() {
+    var selectedName = $("#site").val();
+    $.getJSON("sites.json", function(sites) {
+        $.each(sites, function(sitename, site) {
+           if ( selectedName == sitename ) {
+                $("#lat").val(site.latitude);
+                $("#lon").val(site.longitude);
+                $("#initial_alt").val(site.altitude);
+           }
+        });
+        plotClick();
+    });
+}
+
 function throwError(data) {
     $("#error_message").html(data);
     $("#error_window").fadeIn();
@@ -530,6 +553,9 @@ function setupEventHandlers() {
     $("#delta_lon").change(function() {
         drawDeltaSquare(map);
     });
+    $("#site").change(function() {
+        changeLaunchSite();
+    });
     google.maps.event.addListener(map, 'mousemove', function(event) {
         showMousePos(event.latLng);
     });
@@ -576,8 +602,7 @@ function UpdateLaunchSite(id) {
 }
 
 function SetSiteOther() {
-        optOther = document.getElementById("other");
-        optOther.selected = true;
+    $("#site").val("Other");
 }
 
 rad = function(x) {return x*Math.PI/180;}

predict/sites.json

@@ -0,0 +1,27 @@
+{
+    "Churchill": {
+        "latitude"  :   52.2135,
+        "longitude" :   0.0964,
+        "altitude"  :   0,
+    },
+    "EARS": {
+        "latitude"  :   52.2511,
+        "longitude" :   -0.0927,
+        "altitude"  :   0.
+    },
+    "Glenrothes": {
+        "latitude"  :   56.13,
+        "longitude" :   -3.06,
+        "altitude"  :   0,
+    },
+    "Bujaraloz, Monegros": {
+        "latitude"  :   41.4958,
+        "longitude" :   -0.15797,
+        "altitude"  :   0,
+    },
+    "Adelaide": {
+        "altitude"  :   0,
+        "latitude"  :   -34.9499,
+        "longitude" :   138.5194,
+    }
+}