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<html>
<head>
<title>Find Census Tract Map</title>
<link rel="stylesheet" href="elements/leaflet/leaflet.css"/>
<script src="elements/leaflet/leaflet.js"></script>
</head>
<body>
<h1>Please select your location on the map</h1>
<table>
<tr>
<td valign=top>
<input type="button" value="Use below census track" onclick="changeMainDiv()">
<P>
Census Tract: <div id="mycensustract"></div>
<input type=hidden id="censustract" value="">
</td>
<td>
<div id="mapid" style="width: 600px; height: 600px;"></div>
</td>
</tr>
</table>
<script>
var mymap = L.map('mapid').setView(getLatLong('<%$loc%>'), 15);
var popup = L.popup();
var mainLayer = L.tileLayer('https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
maxZoom: 19,
attribution: '© <a href="http://www.openstreetmap.org/copyright">OpenStreetMap</a>'
}).addTo(mymap);
var markersLayer = new L.LayerGroup();
mymap.addLayer(markersLayer);
function onMapClick(e) {
markersLayer.clearLayers();
var marker = L.marker([e.latlng.lat, e.latlng.lng]);
marker.bindPopup("You selected (" + e.latlng.lat + " , " + e.latlng.lng + ")").openPopup();
markersLayer.addLayer(marker);
getCensusTract(e.latlng.lat, e.latlng.lng);
}
mymap.on('click', onMapClick);
function Get(yourUrl){
var Httpreq = new XMLHttpRequest(); // a new request
Httpreq.open("GET",yourUrl,false);
Httpreq.send();
return Httpreq.responseText;
}
function getLatLong(loc) {
var url = 'http://nominatim.openstreetmap.org/search?format=json&limit=1&q=' + loc;
var json_obj = JSON.parse(Get(url));
return [json_obj[0].lat, json_obj[0].lon];
}
function getCensusTract(lat, lon) {
var url = 'xmlhttp-censustract.html?lat=' + lat + '&lon=' + lon + '&census_year=<%$census_year%>';
var json_obj = JSON.parse(Get(url));
var tract = (json_obj.Block.FIPS.substr(0, 11) / 100).toFixed(2);
document.getElementById("mycensustract").innerHTML = tract;
}
function changeMainDiv(lat,lng) {
window.opener.document.getElementById("newcensustract").innerHTML = document.getElementById("mycensustract").innerHTML;
window.opener.document.getElementById("new_tract").value = document.getElementById("mycensustract").innerHTML;
window.opener.document.getElementById("setnewtractdiv").style.display = "block";
window.opener.document.getElementById("cancelsubmissiontop").style.display = "none";
window.opener.document.getElementById("cancelsubmissionbottom").style.display = "block";
window.close();
}
</script>
</body>
</html>
<%init>
local $SIG{__DIE__}; #disable Mason error trap
my $DEBUG = 0;
my $census_year = $cgi->param('census_year');
my $pre = $cgi->param('pre');
my $zip_code = $cgi->param('zip_code');
my $address = $cgi->param('address');
my $loc = $zip_code ? $zip_code : $address;
</%init>
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