Google Maps Circle
Question
I am trying to load data from an API then display it using circles. I am able to create markers with the data points but not circles. I am following this example here from Google's documentation .
What I expect to happen is in the for loop , using center: new google.maps.LatLng(well.location.latitude, well.location.longitude) would suffice to create the center points. However, that doesn't seem to work. Everything else is the same as the example (will modify later).
I expected this to work because earlier in the example, I am able to use $.each to display markers using field.location.latitude, field.location.longitude which is essentially the same thing (or so I think).
Can I not make circles within the $.getJSON function like I can with markers? Is it happening "out of sync"? I'm still trying to learn how to process async events.
HTML:
<head>
<script src="http://maps.googleapis.com/maps/api/js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>
</head>
<body>
<div id="map"></div>
</body>
CSS:
#map {
border: 1px solid black;
margin: 0 auto;
width: 500px;
height: 300px;
}
JavaScript
var map;
var mapProp;
var url;
var marker;
var markers = [];
var infoWindow;
var wellCircle;
function initMap() {
mapProp = {
center: new google.maps.LatLng(39.0, -105.782067),
zoom: 6,
mapTypeId: google.maps.MapTypeId.TERRAIN
};
map = new google.maps.Map(document.getElementById("map"), mapProp);
infoWindow = new google.maps.InfoWindow({
content: "hello world"
});
};
function addMarker(lat, lng) {
marker = new google.maps.Marker({
position: new google.maps.LatLng(lat, lng),
map: map
});
markers.push(marker);
//console.log(markers);
};
$(document).ready(function() {
url = 'https://data.colorado.gov/resource/hfwh-wsgi.json?&$limit=500';
initMap();
$.getJSON(url, function(data) {
//console.log(data);
for (var i = 0; i < data.length; i++) {
//console.log(data[i].location.latitude + ", " + data[i].location.longitude);
};
$.each(data, function(i, field) {
addMarker(field.location.latitude, field.location.longitude);
});
for (var well in data) {
wellCircle = new google.maps.Circle({
strokeColor: '#FF0000',
strokeOpacity: 0.8,
strokeWeight: 2,
fillColor: '#FF0000',
fillOpacity: 0.35,
map: map,
center: new google.maps.LatLng(well.location.latitude,
well.location.longitude),
radius: 100000
});
};
});
});
2 answers
solution1
2 ACCPTED 2015-11-25 14:34:33
data is an array, either iterate through it, or use $.each (or .forEach).
for (var i=0; i < data.length; i++) {
var wellCircle = new google.maps.Circle({
strokeColor: '#FF0000',
strokeOpacity: 0.8,
strokeWeight: 2,
fillColor: '#FF0000',
fillOpacity: 0.35,
map: map,
center: new google.maps.LatLng(data[i].location.latitude, data[i].location.longitude),
radius: 10000
});
};
or (like you did with the markers):
$.each(data, function(i, well) {
var wellCircle = new google.maps.Circle({
strokeColor: '#FF0000',
strokeOpacity: 0.8,
strokeWeight: 2,
fillColor: '#FF0000',
fillOpacity: 0.35,
map: map,
center: new google.maps.LatLng(well.location.latitude, well.location.longitude),
radius: 10000
});
});
code snippet:
var map; var mapProp; function initMap() { mapProp = { center: new google.maps.LatLng(39.0, -105.782067), zoom: 6, mapTypeId: google.maps.MapTypeId.TERRAIN }; map = new google.maps.Map(document.getElementById("map"), mapProp); infoWindow = new google.maps.InfoWindow({ content: "hello world" }); }; $(document).ready(function() { url = 'https://data.colorado.gov/resource/hfwh-wsgi.json?&$limit=500'; initMap(); $.getJSON(url, function(data) { $.each(data, function(i, well) { var wellCircle = new google.maps.Circle({ strokeColor: '#FF0000', strokeOpacity: 0.8, strokeWeight: 2, fillColor: '#FF0000', fillOpacity: 0.35, map: map, center: new google.maps.LatLng(well.location.latitude, well.location.longitude), radius: 10000 }); }); }); });
body, html { margin: 0px; padding: 0px; width: 100%; height: 100%; } #map { border: 1px solid black; margin: 0 auto; width: 99%; height: 99%; }
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <script src="https://maps.googleapis.com/maps/api/js"></script> <div id="map"></div>
solution2
1 2015-11-25 14:26:35
Your code for the markers was correct, but there are some items of your data that do not have a location property, that's why your code is not fully working.
If you want to add Circles instead of markers, you can use your $.each loop and simply check the location block before adding a point.
Here is a working example: http://jsfiddle.net/xb7eh58p/ (sorry, didn't use yours because I had not seen your link)
In details, here is your code that I adjusted:
var map;
var mapProp;
var url;
var marker;
var markers = [];
var infoWindow;
var wellCircle;
function initMap() {
mapProp = {
center: new google.maps.LatLng(39.0, -105.782067),
zoom: 6,
mapTypeId: google.maps.MapTypeId.TERRAIN
};
map = new google.maps.Map(document.getElementById("map"), mapProp);
infoWindow = new google.maps.InfoWindow({
content: "hello world"
});
};
function addMarker(lat, lng) {
marker = new google.maps.Marker({
position: new google.maps.LatLng(lat, lng),
map: map
});
markers.push(marker);
};
$(document).ready(function() {
url = 'https://data.colorado.gov/resource/hfwh-wsgi.json?&$limit=500';
initMap();
$.getJSON(url, function(data) {
//console.log(data);
//for (var i = 0; i < data.length; i++) {
// console.log(data[i].location.latitude + ", " + data[i].location.longitude);
//};
$.each(data, function(i, field) {
if(field.location) {
wellCircle = new google.maps.Circle({
strokeColor: '#FF0000',
strokeOpacity: 0.8,
strokeWeight: 2,
fillColor: '#FF0000',
fillOpacity: 0.35,
map: map,
center: new google.maps.LatLng(field.location.latitude,
field.location.longitude),
radius: 100000
});
} else {
console.log("Missing location for this data item");
}
});
});
});
As you can see, you just need to ckeck if(field.location)
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