Center map to my location - google-maps

I have the following code:
map = new google.maps.Map(document.getElementById('map-canvas'), {
zoom: 13,
center: new google.maps.LatLng(53.529773,-113.509387),
mapTypeId: google.maps.MapTypeId.ROADMAP
});
How can I replace:
center: new google.maps.LatLng(53.529773,-113.509387)
with my current location, programatically

Your code looks correct, I suspect that your issue is that your device does not have location services enabled, if it does you may not have accept the security prompt when it runs the first time.
This following demo I modified from the google maps API reference
https://developers.google.com/maps/documentation/javascript/
HTML Demo
<div id="map"></div>
<!-- Replace the value of the key parameter with your own API key. -->
<script async defer
src="https://maps.googleapis.com/maps/api/js?key=AIzaSyCkUOdZ5y7hMm0yrcCQoCvLwzdM6M8s5qk&callback=initMap">
</script>
CSS
/* Always set the map height explicitly to define the size of the div
* element that contains the map. */
#map {
height: 100%;
}
/* Optional: Makes the sample page fill the window. */
html, body {
height: 100%;
margin: 0;
padding: 0;
}
JS
function initMap() {
// Pick a start point, I live in Australia, so just picked the middle of OZ
var myLatLng = {lat: -25.363, lng: 131.044};
var map = new google.maps.Map(document.getElementById('map'), {
zoom: 4,
center: myLatLng
});
// Mark it on the map, this is the original center
var marker = new google.maps.Marker({
position: myLatLng,
map: map,
title: 'Hello World!'
});
// If location services is enabled, the following should center the map on your location.
if (navigator.geolocation) {
navigator.geolocation.getCurrentPosition(function (position) {
var location = new google.maps.LatLng(position.coords.latitude, position.coords.longitude);
map.setCenter(location);
});
}
}

Related

How to check google map API is fully loaded or not using setimeout function?

First I checked without setTimeout function google map API is fully loaded or not using map idle function. it's working fine. but I tried using the setTimeout function in the google map loading page. the map is loaded successfully. but map idle function is not working on how to fix this issue.
Code.html
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no">
<meta charset="utf-8">
<title>Simple Markers</title>
<style>
/* Always set the map height explicitly to define the size of the div
* element that contains the map. */
#map {
height: 100%;
}
/* Optional: Makes the sample page fill the window. */
html, body {
height: 100%;
margin: 0;
padding: 0;
}
</style>
</head>
<body>
<div id="map"></div>
<script>
var map;
function initMap() {
var myLatLng = {lat: -25.363, lng: 131.044};
setTimeout(function(){
map = new google.maps.Map(document.getElementById('map'), {
zoom: 4,
center: myLatLng
});
},2000);
google.maps.event.addListenerOnce(map, 'idle', function(){
console.log('hi')
var marker = new google.maps.Marker({
position: myLatLng,
map: map,
title: 'Hello World!'
});
})
// var map = new google.maps.Map(document.getElementById('map'), {
// zoom: 4,
// center: myLatLng
// });
// var marker = new google.maps.Marker({
// position: myLatLng,
// map: map,
// title: 'Hello World!'
// });
}
</script>
<script async defer
src="https://maps.googleapis.com/maps/api/js?key=***********&callback=initMap">
</script>
</body>
</html>
How to achieve this scenario.
You can use the tilesloaded event of the Maps Javascript API Events. The tilesloaded is used to detect when the map has been fully loaded. A sample POC below using your current implementation.
var map;
function initMap() {
var myLatLng = {lat: -25.363, lng: 131.044};
map = new google.maps.Map(document.getElementById('map'), {
zoom: 4,
center: myLatLng
});
map.addListener('tilesloaded', function() {
console.log('map is loaded');
});
google.maps.event.addListenerOnce(map, 'idle', function(){
console.log('map is idle')
var marker = new google.maps.Marker({
position: myLatLng,
map: map,
title: 'Hello World!'
});
});
}
If this doesn't help you, you can also check the answer from this Stackoverflow question How can I check whether Google Maps is fully loaded?. It appears a lot of users were also experiencing this issue before.
Hope this information find you helpful and good luck on your applicaion!
Use titesloaded event to listen to complete map load.

Remove non-KML item from KMZ archive displayed on Google Map

I am loading a KMZ on a Google Map using google.maps.KmlLayer. The KMZ contains a KML layer and some image files. I would like to display only the KML file on my map, but the image files are added as well.
Is there any way to remove non-KML elements (like a PNG file) from a KMZ archive displayed using google.maps.KmlLayer? I can't seem to find the PNGs as elements in the DOM, otherwise I'd just hide or remove them that way.
One possible solution might be to download the KMZ to the server, extract only the KML file, and add that to the map. But I'd like to try to keep this on the client-side if possible.
Here is an example of a KMZ archive that includes two PNG files (in this case, I'd only want to remove one of them, legend.png):
var map;
function initMap() {
map = new google.maps.Map(document.getElementById('map'), {
zoom: 2,
mapTypeId: google.maps.MapTypeId.TERRAIN,
center: {
lat: 41.876,
lng: -87.624
}
});
}
initMap();
var kmlUrl = 'https://www.weather.gov/source/crh/shapefiles/wwa.kmz';
var kmlOptions = {
suppressInfoWindows: true,
preserveViewport: false,
map: map
};
var kmlLayer = new google.maps.KmlLayer(kmlUrl, kmlOptions);
<script src="https://maps.googleapis.com/maps/api/js?sensor=false"></script>
<div id="map" style="min-width: 800px; min-height: 660px"></div>
Per the documentation there is a KmlOptions property that disables the display of ScreenOverlays:
screenOverlays
Type: boolean
Whether to render the screen overlays. Default true.
Setting it to true removes that legend.
var map;
function initMap() {
map = new google.maps.Map(document.getElementById('map'), {
zoom: 2,
mapTypeId: google.maps.MapTypeId.TERRAIN,
center: {
lat: 41.876,
lng: -87.624
}
});
}
initMap();
var kmlUrl = 'https://www.weather.gov/source/crh/shapefiles/wwa.kmz';
var kmlOptions = {
suppressInfoWindows: true,
preserveViewport: false,
map: map,
screenOverlays: false
};
var kmlLayer = new google.maps.KmlLayer(kmlUrl, kmlOptions);
html,
body,
#map {
height: 100%;
width: 100%;
padding: 0px;
margin: 0px;
}
<script src="https://maps.googleapis.com/maps/api/js?key=AIzaSyCkUOdZ5y7hMm0yrcCQoCvLwzdM6M8s5qk"></script>
<div id="map"></div>

How to Google Maps marker blink for time interval?

I am new at Google Maps technologies.I want to blink or bounce google maps marker for a time interval for example one minute.Is it possible to do it? Could you please show me a way to succeed it?
The google.maps.Marker class supports setAnimation(animation:Animation) method, which according to the docs:
Start an animation. Any ongoing animation will be cancelled. Currently
supported animations are: BOUNCE, DROP. Passing in null will cause any
animation to stop.
So you can just call
marker.setAnimation(google.maps.Animation.BOUNCE);
to start bouncing animation and
marker.setAnimation(null);
to stop it. Working example:
function initMap() {
var myLatLng = {lat: -25.363, lng: 131.044};
var map = new google.maps.Map(document.getElementById('map'), {
zoom: 4,
center: myLatLng
});
var marker = new google.maps.Marker({
position: myLatLng,
map: map,
title: 'Hello World!'
});
marker.setAnimation(google.maps.Animation.BOUNCE);
}
<script type="text/javascript" src="http://www.google.com/jsapi"></script>
<script type="text/javascript">
google.load("maps", "3",{other_params:"sensor=false"});
</script>
<body onload="initMap();" style="margin:0px; padding:0px;" >
<div id="map" style="height:400px; width:500px;"></div>
</body>
Blinking animation is not supported out of the box, but you can create it yourself, the example is already included in other answers.
may cause errors. (using googlemap without apikey)
var on = true;
var intervalSeconds = 0.5;
var myLatLng = {lat: -25.363, lng: 131.044};
var map = new google.maps.Map(document.getElementById('map'), {
zoom: 4,
center: myLatLng
});
var marker = new google.maps.Marker({
position: myLatLng,
map: map,
title: 'Hello World!'
});
setInterval(function() {
if(on) {
marker.setMap(null);
} else {
marker.setMap(map);
}
on = !on;
}, intervalSeconds * 1000);
#map {
width: 800px;
height: 600px;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script type="text/javascript" src="http://maps.google.com/maps/api/js?sensor=false"></script>
<div id="map"></div>
I suggest for blinking maps marker you can use .gif file since google maps marker does not support blinking animation.
Just change the source of your image to .gif file and it will work.
for example.
var mapIcon= "/assets/mapIcon.gif");
var marker = new google.maps.Marker({
position: latLng,
map: map,
icon: mapIcon,
optimized: false
});
[NOTE] Don't forget to add optimized: false because sometimes it will not work properly.

Google maps API getProjection() not working in V3

According to the API ref, the map object should have a getProjection
method:
http://code.google.com/apis/maps/documentation/v3/reference.html#Map
While loading the map in this example
should alert the x,y point, but instead
throws the value as undefined. This is the below sample code called in onload.
function initialize() {
var mapOptions = {
zoom: 8,
center: new google.maps.LatLng(-34.397, 150.644),
mapTypeId: google.maps.MapTypeId.ROADMAP
};
map = new google.maps.Map(document.getElementById('map-canvas'), mapOptions);
alert("projection:" + map.getProjection());
}
It isn't available until the map is finished initializing. You have to wait on the "projection_changed" event before accessing it.
function initialize() {
var mapOptions = {
zoom: 8,
center: new google.maps.LatLng(-34.397, 150.644),
mapTypeId: google.maps.MapTypeId.ROADMAP
};
map = new google.maps.Map(document.getElementById('map-canvas'),
mapOptions);
google.maps.event.addListenerOnce(map,"projection_changed", function() {
alert("projection:"+map.getProjection());
});
}
proof of concept fiddle
code snippet:
function initialize() {
var mapOptions = {
zoom: 8,
center: new google.maps.LatLng(-34.397, 150.644),
mapTypeId: google.maps.MapTypeId.ROADMAP
};
map = new google.maps.Map(document.getElementById('map-canvas'),
mapOptions);
google.maps.event.addListenerOnce(map, "projection_changed", function() {
console.log("projection:" + map.getProjection());
document.getElementById('output').innerHTML = "map.getProjection()=" + JSON.stringify(map.getProjection(), null, ' ');
});
}
/* Always set the map height explicitly to define the size of the div
* element that contains the map. */
#map-canvas {
height: 80%;
}
/* Optional: Makes the sample page fill the window. */
html,
body {
height: 100%;
margin: 0;
padding: 0;
}
<!DOCTYPE html>
<html>
<head>
<title>Simple Map</title>
<script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script>
<!-- jsFiddle will insert css and js -->
</head>
<body>
<div id="output"></div>
<div id="map-canvas"></div>
<!-- Async script executes immediately and must be after any DOM elements used in callback. -->
<script src="https://maps.googleapis.com/maps/api/js?key=AIzaSyCkUOdZ5y7hMm0yrcCQoCvLwzdM6M8s5qk&callback=initialize&libraries=&v=weekly" async></script>
</body>
</html>

Google Map not showing up API V3 or showing up very slowly

I'm having a heck of a time trying to get a basic Google Map to show up. I've been on Stack Overflow for hours and haven't had any success so far. The closest I've gotten is the map loads 1/4 of a square, the top left quarter. But then if you try to drag, zoom, etc it just turns grey like the rest of the map. On a few occasions, with the same code, the map will load fully but only after a long time (not sure exactly how long, but > 5 minutes).
In my template I have
<div id="map" style="width: 500px; height: 400px;"></div>
And then in my backbone view
$.getScript('http://maps.google.com/maps/api/js?sensor=false&callback=gMapsCallback')
window.gMapsCallback = function(){
var myLatlng = new google.maps.LatLng(-34.397, 150.644);
var mapOptions = {
zoom: 8,
center: myLatlng,
mapTypeId: google.maps.MapTypeId.ROADMAP
};
var map = new google.maps.Map(document.getElementById("map"),
mapOptions);
}
Any ideas what might be happening? I am also open to any suggestions on a superior way to load a google map into a backbone view.
Ok, turns out there were a number of issues, including embedding a map in a Bootstrap tab, not including a callback, defining the div height and width, setting a small delay to load the map, and setting css attributes for the map. Oi. My final solution turned out to be:
In the template
<script src='http://maps.google.com/maps/api/js?sensor=false&callback=gMapsCallback'></script>
<div id="map" style="width: 500px; height: 400px;"></div>
In the stylesheet
#map img {
max-width: none;
}
#map label {
width: auto; display:inline;
}
In the Backbone View
setTimeout(function(){
var myLatlng = new google.maps.LatLng(53.1, -2.44);
var mapOptions = {
zoom: 8,
center: myLatlng,
mapTypeId: google.maps.MapTypeId.ROADMAP
};
var map = new google.maps.Map(document.getElementById("map"),
mapOptions);
// Create marker
var marker = new google.maps.Marker({
map: map,
position: new google.maps.LatLng(53.1, -2.44),
title: 'The armpit of Cheshire'
});
// Add circle overlay and bind to marker
var circle = new google.maps.Circle({
map: map,
radius: 10000, // metres
fillColor: '#AA0000'
});
circle.bindTo('center', marker, 'position');
google.maps.event.trigger(map, "resize");
map.setZoom( map.getZoom() );
}, 100);
Painful. Notice that when I call the gmaps script I had to include the callback even though I never use it. Without it, it didn't work fully. No clue why.