I have am displaying 2000 markers on google maps. I notice the performance is a little slow. What I am not sure about... is it it slow because if the number of markers added to the map or visibility? How do I improve the performance? Can I just add them to the map and "hide" markers outside of bounds? Would that help or would it not because even though its not visible, its added to the map? The data to show the markers is in an list called var datapoints = [...].
My code to add markers is like this:
for (i = 0; i < markers.length; i++) {
var data = markers[i]
var myLatlng = new google.maps.LatLng(data.lat, data.lng);
var marker = new google.maps.Marker({
position: myLatlng,
map: map,
title: data.title
});
(function (marker, data) {
google.maps.event.addListener(marker, "click", function (e) {
infoWindow.setContent(data.description);
infoWindow.open(map, marker);
});
})(marker, data);
}
Any optimization recommendations appreciated!
You have a few options here. Google's docs suggest either limiting visible markers to the current viewport, clustering (distance or grid based), or fusion tables. I've implemented google maps with a customization of the MarkerClusterer module that works quite well for large amounts of markers on one map. Best of luck!
Related
I need to know about to get google map points location in Meteor JS.For example in my map showing 10 pointers based on location latitude and longitude.When ever click a marker then shows location based on that pointer in a new window(or popup).
I didn't get any idea about this.So please suggest me what to do for this?
Thanks in advance.
What you need here its an InfoWindow, wich have the content option.
So lets say you have this simple initialize function
initializeMap = function() {
//Common code to init the map.
//common code to create dynamic markers already give you an answer here
//https://stackoverflow.com/questions/28424854/how-can-i-create-multiple-markers-on-a-google-map
//now on the same function lets add this code
function createMarkers(){
for(var i = 0 ; i <latLong.length ; i++) {
//lati and long are declared as global variables.
lati = latLong[i].lat;
longi = latLong[i].long;
var marker = new google.maps.Marker({
position: new google.maps.LatLng(lati, longi),
map: map,
icon: 'http://Yourimagesourcehere'
});
//and this is how you call it.
myInfoWindow(marker2,map,lati,long);
}
//Function to created infoWindows.
function myInfoWindow(marker2,map,lati,long){
google.maps.event.addListener(marker2, 'mouseover', function() {
for(var i=0;i<markerArray.length;i++){
infoWindow.setContent( 'My lat is ' + lati + "my long is " + longi );
infoWindow.open(map, marker2);
}});
google.maps.event.addListener(marker2, 'mouseout', function() {
infoWindow.close();
}
}
}
So like you see based on the other question How can i create multiple markers on a google map, in this example we added the new function named myInfoWindow with 4 parameters, the marker,the map, and the 2 variables for the content (in this case late,long)
If you have doubts about how to init the map or how the code should look i have this DEMO and here is the Source Code, just add the infoWindow function inside the createMarkers function and it should work.
Tell me if Works.
I have the following function. geolocationService.getNearbyPeoples() is a service that
fetch data from db.
function nearbyPeoples(meLat, meLng, map){
geolocationService.getNearbyPeoples(meLat, meLng).then(function(response){
for (var i = 0; i < response.data.length; i++) {
var nearbyLatLng = new google.maps.LatLng(response.data[i].lat, response.data[i].lng);
var nearbyMarkers = new google.maps.Marker({
position: nearbyLatLng,
title: response.data[i].first_name
}).setMap(map);
};
});
}
then when dragend a center marker (meMarker) will call the function above to show nearby markers
google.maps.event.addListener(meMarker, 'dragend', function() {
nearbyPeoples(meMarker.position.lat(), meMarker.position.lng(), map);
});
then I want to remove the previous markers in dragstart. The reason is to prevent duplicated
markers if meMarker is dragend same location.
google.maps.event.addListener(meMarker, 'dragstart', function() {
});
But I have no idea how to remove or any better suggestions?
Instead of removing markers, why not keep a list (object) of markers as they are added and use it to avoid duplicating a marker? And/or use it to remove markers outside the bounds of the map view, if you must remove markers.
I'm using the Google Maps API v3 to generate some minimaps. I have one custom marker in a small map with controls hidden. This works great. Now, I'd like to add a link so that clicking this marker will open the full Google Maps with this location selected. Seems obvious.
I'm creating a marker like this.
var pin = new google.maps.LatLng(myLat,myLong);
var marker = new google.maps.Marker({
position: pin,
map: map,
title:"Hello World"
});
This seems like it should be obvious, what am I missing? Do I need to construct my link and assign it myself?
This should work (not tested):
var pin = new google.maps.LatLng(myLat,myLong);
var marker = new google.maps.Marker({
position: pin,
map: map,
title:"Hello World"
});
google.maps.addListener(marker, "click", function() {
window.location = "https://maps.google.com/maps?ll="+pin.toUrlValue;
});
Working example (built on an existing example, not from the above code)
Ended up finding the answer thusly:
google.maps.event.addListener(marker, 'click', function() {
window.open("https://maps.google.com/maps?ll="+pin.toUrlValue(),'_blank');
});
My Google maps API map zooms put to show all the markers added after a google places search. On a mobile map this can take a bit to load and as this app for cyclists I prefer to only show the results within the viewport. Most research I read indicates it is not possible to only return results within the view port. Is it possible for me to just keep the map bounds from changing after the markers are added? It would be great if it would just show me the markers added to the current bounds unless there is only one marker returned, then it should zoom to that marker. So searching for something general like pizza will show many pizza places in the current viewport without panning or zooming. Searching for a specific address will zoom to that marker even if it is outside the viewport.
var input = document.getElementById('target');
var searchBox = new google.maps.places.SearchBox(input);
var bounds = map.getBounds();
searchBox.setBounds(bounds);
var markers = [];
service = new google.maps.places.PlacesService(map);
google.maps.event.addListener(searchBox, 'places_changed', function() {
var places = searchBox.getPlaces();
// alert("getPlaces returns "+places.length+" places");
for (var i = 0; i < gmarkers.length; i++) {
gmarkers[i].setMap(null);
}
gmarkers = [];
var bounds = new google.maps.LatLngBounds();
for (var i = 0, place; place = places[i]; i++) {
var place = places[i];
createMarker(place);
bounds.extend(place.geometry.location);
}
map.fitBounds(bounds);
// if (markers.length == 1) map.setZoom(17);
});
google.maps.event.addListener(map, 'bounds_changed', function() {
var bounds = map.getBounds();
searchBox.setBounds(bounds);
});
ib = new InfoBox({});
The answer to your question:
it possible for me to just keep the map bounds from changing after the markers are added?
is yes. And as you say, involves removing the map.fitBounds.
To get the map to center and zoom on a single address, either use the geocoder for that (implement it separately) or check the number of results, if it is one, center the map on the result and if there is a suggested viewport in the result, use that to center and zoom the map [with map.fitBounds(place.geometry.viewport) I think].
Does any one have a clue how to add an info windows to the cluster markers, containing the merged markers info window content?
This is an of the default marker clusterer behaviour:
http://www.psop.fr/MAP_Population_Google.php
thanks
You should listen to the clusterclick event on the markercluster. The object that is passed into the event contains an array of markers that are in the cluster and the position of the cluster.
google.maps.event.addListener(markerCluster, 'clusterclick', function(cluster) {
markers = cluster.getMarkers();
info = "";
$.each(markers, function(x, marker) {
if(me.infowindows[marker.__gm_id]){
info = info + "<br/>" + me.infowindows[marker.__gm_id].content;
}
});
.....
something like that works, you get the markers associated with the clusterclick. and then loop through the infowindows, i'm not sure how yours is set up. but the above code should make sense.
you also need to disable the zoom on click as the clusters get re-drawn for each zoom.
var contentString = 'This is an example';
var infowindow = new google.maps.InfoWindow({
content: contentString
});
google.maps.event.addListener(marker, 'click', function() {
infowindow.open(map,marker);
});