Hi so I'm working a google maps element into an app I'm writing and am having trouble dropping a pin on the user's current location.
I can get the map to load a fusion table layer of pins, and center on the user's current location, but I'd like to be able to then drop a marker at the user's current location, and resize the map to fit all the markers. Is this possible? If not I can just set the zoom to an appropriate level.
This is the code I'm working with:
var geocoder = new google.maps.Geocoder();
function initialize() {
map = new google.maps.Map(document.getElementById('googft-mapCanvas'), {
center: new google.maps.LatLng([app:user-lat], [app:user-lon]),
zoom: 12,
mapTypeId: google.maps.MapTypeId.ROADMAP
});
layer = new google.maps.FusionTablesLayer({
map: map,
heatmap: { enabled: false },
query: {
select: "col2, col0",
from: "1pbba_dFcpWQKQDXQUt9RNXp16GqX5Jz-NraafEI",
where: ""
},
options: {
styleId: 3,
templateId: 3
}
});
}
google.maps.event.addDomListener(window, 'load', initialize);
I should also say that the [app:user-lat] and [app:user-lon] calls are application specific, taking data from the mobile device, and will work to insert the current user's location. This is the reason I'm not doing a call for the current position through google maps api, thanks in advance for anyone taking the time to help.
To place a marker at the user's position, add this after you define your map:
var marker = new google.maps.Marker({
position: new google.maps.LatLng([app:user-lat], [app:user-lon]),
map: map
});
If you want to move it as the user moves, that will be a little more complicated, keep a reference to it and use marker.setPosition.
function initialize() {
map = new google.maps.Map(document.getElementById('googft-mapCanvas'), {
center: new google.maps.LatLng([app:user-lat], [app:user-lon]),
zoom: 12,
mapTypeId: google.maps.MapTypeId.ROADMAP
});
var marker = new google.maps.Marker({
position: new google.maps.LatLng([app:user-lat], [app:user-lon]),
map: map
});
layer = new google.maps.FusionTablesLayer({
map: map,
heatmap: { enabled: false },
query: {
select: "col2, col0",
from: "1pbba_dFcpWQKQDXQUt9RNXp16GqX5Jz-NraafEI",
where: ""
},
options: {
styleId: 3,
templateId: 3
}
});
}
google.maps.event.addDomListener(window, 'load', initialize);
To center the map on the markers (or zoom the map to show them all, you will need to query the FusionTable for all the markers, construct a google.maps.LatLngBounds object from their locations, then use that as an argument to map.fitBounds.
Here are a couple of examples that do that (but with a different column layout (two column location) than your table. The concept can be adjusted for your column layout (query for the single column location, parse it to create a google.maps.LatLng and add it to the google.maps.LatLngBounds):
http://www.geocodezip.com/v3_FusionTablesLayer_centerOnMarkers.html
http://www.geocodezip.com/www_vciregionmap_comC.html
example that zooms and centers the map on the data in your table. Notes:
The GViz API that is used is limited to 500 rows, if you have more data that that you probably don't want to do this anyway.
The maps is centered on the data not the user.
Related
I am trying to make an AJAX map Google map, where the place markers update but not the map.
I have an ajax setup with a settimeout function, which returns new javascript. When the new javascript is loaded into my HTML, the changes do not reflect on my google map.
When I go into the firefox inspector and try and manipulate the javascript, (to try and change marker GPS coordinates), nothing happens to the map, and the points are still the same. Why does that not affect the map?
I have looked at several links to try and help me, but none of them explain the logic behind the javascript.
My PHP script returns javascript in plain text. But when these get
added to the HTML, The google map does not change and looks like it
needs to be re initialized before it recognizes new javascript?
Can someone explain how I should update the javascript, so the map re-centers on the newest marker and places the newest marker without refreshing the page / re initializing the map?
<div id="map"></div>
<script>
function initMap() {
var map = new google.maps.Map(document.getElementById('map'), {
zoom: 13,
center: {lat: -20.530637, lng: 46.450046}
});
// Create an array of alphabetical characters used to label the markers.
var labels = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
// Add some markers to the map.
// Note: The code uses the JavaScript Array.prototype.map() method to
// create an array of markers based on a given "locations" array.
// The map() method here has nothing to do with the Google Maps API.
var markers = locations.map(function(location, i) {
return new google.maps.Marker({
position: location,
label: labels[i % labels.length]
});
});
// Add a marker clusterer to manage the markers.
var markerCluster = new MarkerClusterer(map, markers,
{imagePath: 'https://developers.google.com/maps/documentation/javascript/examples/markerclusterer/m'});
}
var locations = [
new google.maps.LatLng("-21.530637,46.450046),
new google.maps.LatLng("-22.530637,46.450046),
]
</script>
<script src="https://developers.google.com/maps/documentation/javascript/examples/markerclusterer/markerclusterer.js">
</script>
<div class="result"></div>
<script type="text/javascript" src="http://code.jquery.com/jquery-latest.min.js"></script>
<script>
function refresh_div() {
jQuery.ajax({
url:'content.php',
type:'POST',
success:function(results) {
locations=results;
jQuery(".result").html(results);
}
});
}
t = setInterval(refresh_div,5000);
</script>
My "content.php" file. returns more google maps LatLng markers in plain text.
so PHP output is:
new google.maps.LatLng("-23.530637,46.450046"),
new google.maps.LatLng("-24.530637,46.450046"),
new google.maps.LatLng("-25.530637,46.450046"),
new google.maps.LatLng("-26.530637,46.450046")
I would like to summary the behavior of your ajax map:
Initialize map (probably with a set of predefined locations)
Repeatedly call content.php to retrieve new update of markers
Draw new markers to your map
The problem is that your code that handles ajax result doesn't do any map manipulation. In fact, it has to update the variable locations with new location set. Then create new markers with updated list of locations, then call MarkerCluster to apply them.
I created a fiddle to demonstrate it: https://jsfiddle.net/anhhnt/paffzadz/1/
What I did is extract the marker creating part from initMap, so that it can be called multiple times after locations is updated.
function updateMarker () {
// Create an array of alphabetical characters used to label the markers.
var labels = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
// Add some markers to the map.
// Note: The code uses the JavaScript Array.prototype.map() method to
// create an array of markers based on a given "locations" array.
// The map() method here has nothing to do with the Google Maps API.
var markers = locations.map(function(location, i) {
return new google.maps.Marker({
position: location,
label: labels[i % labels.length]
});
});
// Add a marker clusterer to manage the markers.
var markerCluster = new MarkerClusterer(map, markers,
{imagePath: 'https://developers.google.com/maps/documentation/javascript/examples/markerclusterer/m'});
};
function initMap() {
window.map = new google.maps.Map(document.getElementById('map'), {
zoom: 3,
center: {lat: -28.024, lng: 140.887}
});
updateMarker(map);
};
var locations = [
{lat: -31.563910, lng: 147.154312},
{lat: -33.718234, lng: 150.363181},
{lat: -33.727111, lng: 150.371124}
]
function refresh_div() {
jQuery.ajax({
url:'/echo/json/',
type:'POST',
data: {
json: JSON.stringify([
{lat: -42.735258, lng: 147.438000},
{lat: -43.999792, lng: 170.463352}
])
},
success:function(results) {
locations.concat(results);
updateMarker();
}
});
}
t = setInterval(refresh_div,5000);
Hope it helps.
Perhaps you have simple syntax error in your code - missing closing double quote:
new google.maps.LatLng("-23.530637,46.450046"),
...
..or better - remove first double quote:
new google.maps.LatLng(-23.530637,46.450046),
...
I have 3 layers on a Google Maps map. The first is a set of polygons. The second is a set of markers. The third is a heatmap.
I'm using the following script libraries
<script src="https://maps.googleapis.com/maps/api/js?v=3.exp&signed_in=true&libraries=visualization"></script>
<script src="https://www.google.com/jsapi?autoload={'modules':[{'name':'visualization','version':'1.1','packages':['intensitymap']}]}"></script>
I start with a Map object.
var MAP = new google.maps.Map(document.getElementById('map-canvas'),
{
zoom : 5,
center : new google.maps.LatLng(-25.610111, 134.354806),
mapTypeId : google.maps.MapTypeId.ROADMAP
});
followed by the polygons
var polygons = new google.maps.FusionTablesLayer({
query : {
select : 'Polygons',
from : 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx'
},
map : MAP,
suppressInfoWindows : true});
followed by the Markers, one of which is
var marker = new google.maps.Marker({
position: new google.maps.LatLng(-28.8, 152.5),
map: MAP,
icon: 'http://maps.google.com/mapfiles/ms/icons/red-dot.png',
title: "Tabulam"});
followed by the heatmap (abbreviated)
var heatmapLayer = new google.maps.visualization.HeatmapLayer();
var heatData = [
{location: new google.maps.LatLng(-30.3, 153.1), weight: 102}]
heatmapLayer.setData(heatData);
heatmapLayer.setOptions({opacity:1, radius:50});
heatmapLayer.setMap(MAP);
All that wrapped in a function and called with
google.maps.event.addDomListener(window, 'load', initialize);
The problem that I have is that the heatmap is obscured behind the polygons. How do I bring it forward? Alternatively, how do I push the polygons right to the back?
I am mapping 20k records from Google Fusion table using standard circle. I would like to group them using MarkerClusters. Because there is filtering and search occuring, I am not sure where to place the var markerCluster = new MarkerClusterer(map, markers); code.
Here is the map.
Code snippet where markers are created:
//*New Fusion Tables Requirement* API key. found at https://code.google.com/apis/console/
//*Important* this key is for demonstration purposes. please register your own.
googleApiKey: "AIzaSyDj8qostHt2L3aetpO_LuipyS6YvfeZOFA",
//name of the location column in your Fusion Table.
//NOTE: if your location column name has spaces in it, surround it with single quotes
//example: locationColumn: "'my location'",
locationColumn: "geo_coordinates",
map_centroid: new google.maps.LatLng(40.7127,-74.0059), //center that your map defaults to
locationScope: "new york city", //geographical area appended to all address searches
recordName: "result", //for showing number of results
recordNamePlural: "results",
searchRadius: 805, //in meters ~ 1/2 mile
defaultZoom: 13, //zoom level when map is loaded (bigger is more zoomed in)
addrMarkerImage: 'images/blue_pin.png',
currentPinpoint: null,
initialize: function() {
$( "#result_count" ).html("");
geocoder = new google.maps.Geocoder();
var myOptions = {
zoom: MapsLib.defaultZoom,
center: MapsLib.map_centroid,
mapTypeId: google.maps.MapTypeId.TERRAIN,
};
map = new google.maps.Map($("#map_canvas")[0],myOptions);
map.setTilt(45);
map.setOptions({ styles : styles });
// maintains map centerpoint for responsive design
google.maps.event.addDomListener(map, 'idle', function() {
MapsLib.calculateCenter();
});
google.maps.event.addDomListener(window, 'resize', function() {
map.setCenter(MapsLib.map_centroid);
});
MapsLib.searchrecords = null;
I'm using for a while following javascript code to load google map as DIV background.
// When the window has finished loading create our google map below
google.maps.event.addDomListener(window, 'load', init);
function init() {
// Basic options for a simple Google Map
// For more options see: https://developers.google.com/maps/documentation/javascript/reference#MapOptions
var mapOptions = {
// How zoomed in you want the map to start at (always required)
zoom: 15,
// The latitude and longitude to center the map (always required)
center: new google.maps.LatLng(54.549047, 18.443433), // New York
// How you would like to style the map.
// This is where you would paste any style found on Snazzy Maps.
styles: [ { featureType:"all", elementType:"all", stylers:[ { invert_lightness:true }, { saturation:10 }, { lightness:30 }, { gamma:0.5 }, { hue:"#1C705B" } ] } ]
};
// Get the HTML DOM element that will contain your map
// We are using a div with id="map" seen below in the <body>
var mapElement = document.getElementById('map');
// Create the Google Map using out element and options defined above
var map = new google.maps.Map(mapElement, mapOptions);
}
works perfectly. But when I've tried to load there a marker which will point to my location, it crashes. Any ideas what will be the proper placement of such? I assume this is the proper code (which doesn't work..):
var myLatlng = new google.maps.LatLng(54.549047, 18.443433);
var marker = new google.maps.Marker({
position: myLatlng,
map: map,
title: 'Hello World!'
});
thanks for the help!
I have a problem with google maps. When i firstly embeeded iframe to my page on ipad i saw buttons like streetview under the map. When i switched maps to be generated from system data, and rendering using javascript api buttons are gone?
Is there a way to show them again, is it just an options that needs to be added to map or buttons only work when using iframe?
var map;
var service;
var infowindow;
function initializeMap() {
var slocation = new google.maps.LatLng(x,y);
map = new google.maps.Map(document.getElementById('map'), {
mapTypeId: google.maps.MapTypeId.ROADMAP,
center: slocation,
zoom: 15
});
var infowindow = new google.maps.InfoWindow({
content: 'example content'
});
var marker = new google.maps.Marker({
position: slocation,
map: map,
title: ' example title'
});
infowindow.open(map, marker);
}
the buttons that i want to achive are http://imageshack.us/photo/my-images/43/buttonsuv.png/
In your code, add this option streetViewControl: true
map = new google.maps.Map(document.getElementById('map'), {
mapTypeId: google.maps.MapTypeId.ROADMAP,
center: slocation,
zoom: 15,
streetViewControl: true
});
Have a look at this, it summarises all of the street view options.
UPDATE
After the question update, I realise you want your custom image on the street view icon.
That's not possible.
One workaround is to define a custom control on the map, and link events to it with the streetview events.
I've never done it, however you might want to have a look at this