What am trying to do is, load a google map on a page, then load up my markers one by on so the user is seeing as they become available. Am doing this on purpose because I want to show how much my site covers in a city. Now I have tried loading them before the page loads but that takes ages! (I have 600+ markers and growing)
I have the basic knowledge to display a map, load markers but this need a different approach which I need some help with. If any one could point me to a tutorial or some reference page to help me get started would be a huge help.
I am not sure what do you mean it takes ages. Who? Page to render? Map to render.
From a UI point of view ou should try a cluster markers id they are țoo close (there is a demo for v3 api)
You mean like the "too many markers" page from the documentation?
Load a few markers at a time with calls to setTimeout, for example:
//Global variable
var markersData = [];
markersData[0] = {
"lat": 45.0,
"lon": -91.0,
"name":"marker 0"
};
markersData[1] = {
"lat": 45.0,
"lon": -92.0,
"name":"marker 1"
};
//...etc
// Load 10 markers every 100 miliseconds
function load_10_markers(){
for (var n = 0 ; n < 10 ; n++) {
var markerData = markersData.shift();
if(markerData){
var marker = new google.maps.Marker({
position: new google.maps.LatLng(markerData.lat, markerData.lon),
title: markerData.name,
map: map
});
}
}
if(markersData.length){
window.setTimeout("load_10_markers()",100);
}
}
load_10_markers();
Related
So, i have a problem. I had google maps street view on my site, there was a building panorama (inside), now API shows only street view near this building. Why and how can i fix it?
Here is my code:
function initialize() {
var fenway = new google.maps.LatLng(52.4980685,13.2951895);
var panoramaOptions = {
zoom: 1,
panControl:false,
zoomControl:false,
mapTypeControl:false,
scaleControl:false,
rotateControl:false,
streetViewControl:false,
overviewMapControl:false,
disableDefaultUI: false,
addressControl: false,
addressControlOptions: {
position: google.maps.ControlPosition.BOTTOM,
hide: true
},
position: fenway,
pov: {
heading: 0,
pitch: 0
}
};
var panorama = new google.maps.StreetViewPanorama(document.getElementById('pano'), panoramaOptions);
google.maps.setStreetView(panorama);
}
google.maps.event.addDomListener(window, 'load', initialize);
This may be a kind of bug(feel free to report it).
I guess you are talking about the place "Shebell Institut".
Let me explain why it's a bug:
Currently
the ID for this panorama is (at least for me):ag1bfIf47xUAAAGuxVUjCQ
and the location of the panorama(reported by the StreetViewService): (52.498042,13.29517199999998)
The location in your code differs a little bit, but when I use the exact location it should show the desired panorama(because it's the nearest)...but it doesn't.
Also when I query the panorama via StreetViewService.getPanoramaByLocation another panorama (with another location) will be returned, although the documentation says:
If the radius is less than 50 meters, the nearest panorama will be returned.
...but when I use the exact location it shouldn't return a panorama with another location.
I don't have a solution, because regarding to the documentation panorama-ID's are only stable within sessions.
But this must not mean that the panorama-ID must change often(I don't know what forces the change of a panorama-ID, but I can't imagine that the ID will be changed randomly).
So let's give it a try and use the panorama-ID(optionally).
set the panorama-location(fenway in this case) to
(52.498042,13.29517199999998)
request the panoramaData based on the ID (ag1bfIf47xUAAAGuxVUjCQ)
when both locations (fenway and the location of the returned panorama) are equal you may assume that it's still the ID of the desired panorama and use this panorama
new google.maps.StreetViewService()
.getPanoramaById('ag1bfIf47xUAAAGuxVUjCQ',
function(data,status){
if(google.maps.StreetViewStatus.OK===status
&&
data.location.latLng.toUrlValue()==fenway.toUrlValue()
){
panorama.setPano(data.location.pano);
}
});
Demo: http://jsfiddle.net/doktormolle/uwqvr5ee/
When it's sometimes not the desired panorama you may send a notification to the site-admin so that he may update the pano-ID.
I know it's not perfect, but it's the only approach I can think of so far(apart from a custom panorama)
I have been making a script using a fusion table's layer in google maps.
I am using geocoder and get the coordinates of a point that I need.
I put a script that changes the style of a polygon from the fusion table when you click on it, using the google.maps.event.addListener(layer, "click", function(e) {});
I would like to use the same function that I call in the case of a click on the layer, but this time with a click with the coordinates that I got.
I have tried google.maps.event.trigger(map, 'click', {latLng: new google.maps.LatLng(42.701487,26.772308)});
As well as the example here > Google Fusion Table Double Click (dblClick)
I have tried changing map with layer...
I am sorry if my question is quite stupid, but I have tried many options.
P.S. I have seen many post about getting the info from the table, but I do not need that. I want to change the style of the KML element in the selected row, so I do not see it happening by a query.
Here is the model of my script:
function initialize()
{
geocoder = new google.maps.Geocoder();
map = new google.maps.Map(document.getElementById("map_canvas"),myOptions);
layer = new google.maps.FusionTablesLayer({
suppressInfoWindows:true,
map : map,
query : {
select: 'Местоположение',
from: '12ZoroPjIfBR4J-XwM6Rex7LmfhzCDJc9_vyG5SM'
}
});
google.maps.event.addListener(layer, "click", function(e) {
SmeniStilRaionni(layer,e);
marker.setMap(null);
});
}
function SmeniStilRaionni(layer,e)
{
...
}
function showAddress(address)
{
geocoder.geocode( { 'address': address}, function(results, status) {
if (status == google.maps.GeocoderStatus.OK) {
var point = results[0].geometry.location;
//IMITATE THE CLICK
}
});
}
In response to geocodezip
This way you hide all the other elements... I do not wish that. It is like if I want to change the border of the selected element. And I do not wish for a new layer.
In the function that I use now I push the style of the options of the layer and then set the option. I use the e from google.maps.event.addListener(layer, "click", function(e)); by inserting e.row['Name'].value inside the where rule.
I would like to ask you if there is any info on the e variable in google.maps.event.addListener(layer, "click", function(e));
I found out how to get the results I wanted:
For my query after I get the point I use this:
var queryText ="SELECT 'Районен съд','Окръжен съд','Апелативен съд','Местоположение' FROM "+FusionTableID+" WHERE ST_INTERSECTS(\'Местоположение\', CIRCLE(LATLNG(" + point.toUrlValue(6) + "),0.5));";
queryText = encodeURIComponent(queryText);
document.getElementById("vij query").innerHTML = queryText;
var query = new google.visualization.Query('http://www.google.com/fusiontables/gvizdata?tq=' + queryText);
And then I get these results:
var rsyd = response.getDataTable().getValue(0,0);
var osyd = response.getDataTable().getValue(0,1);
var apsyd = response.getDataTable().getValue(0,2);
And then, I use the following:
where: "'Районен съд' = '"+rsyd+"'",
Which is the same as:
where: "'Районен съд' = '"+e.row['Районен съд'].value+"'",
in the click function.
This is a working solution for my problem.
But still, I cannot find a way to Imitate a Mouse click.
The issue is this: the data(row) for the layers will be requested via AJAX when you click on a layer.
In theory it's possible to select a geometry(polygon) by a given LatLng, the geometry-library has a method for this: google.maps.geometry.poly.containsLocation().
Unfortunately the FusionTableAPI does not support such queries(ST_CONTAINS), you cannot select a row by supplying a LatLng and selecting the rows where the geometry contains the LatLng.
So what you can do: create a copy of the table that contains the columns needed to select a row(Община...the distinct value, and Местоположение.... the geometry). This copy may be requested via AJAX, but when the FusionTable will not be modified anymore I would suggest to use a hardcoded copy.
What to do now when you want to simulate the click:
Iterate over all rows of the copy, use the mentioned containsLocation()-method to check if the geometry(Местоположение) contains the LatLng and when it does apply the query by using the value of the distinct column Община .
Of course it would take some time to check all the geometries, but the FusionTable is not very large, it should be a possible approach in your case.
Here is a demo: http://jsfiddle.net/doktormolle/sSwj3/
The size of the stored data is approximately 500kb, you should store the data in an external script, so they may be cached.
You may notice that the highligthning of the selected layer will be much faster when triggered via the links, because there will no data be requested via AJAX. When the highlightning of the selected feature is the only thing you need you may ommit the observation of the layer-click completely and observe the map-click instead. Use the returned LatLng to retrieve the selected row from the data and set the style:
Demo: http://jsfiddle.net/doktormolle/swdX8/
I am working on integrating Google Maps into a web application and I have a question of possibility.
I am using ASP .Net 4.0 as the basis for the code, but i suspect i will have to use JavaScript to achieve most of this, which is. Basically I want to display a bunch of markers on a map from Lat Long locations i have stored in a database, then have the user be able to draw a box on the map with the mouse, then get back the lat long of the four corners of the box.
If anyone knows how i could do this this would be of great help to me!
Thanks
The complexity of the Google Maps API has kept me scared for years. Recently I stumbled upon a jQuery plugin called GMap3 that does a lot of the heavy lifting for you.
I would suggest that after initializing and all that, you print a Javascript block from your .NET code, with something like this:
var markersFromDatabase = [
[60.164967,24.94758],
[59.956495, 10.764599]
//etc. This array should be printed from your serverside code
];
var markersToBeAdded = [];
jQuery.each(markersFromDatabase, function(indexOfItem, valueOfItem){
markersToBeAdded.push({
lat:valueOfItem[0],
lng:valueOfItem[1],
options: {
draggable: false,
icon: "img/your_awesome_icon.png",
title: "This is an icon from my database!"
}
});
});
jQuery("#map_canvas").gmap3(
{ action: 'addMarkers',
markers: markersToBeAdded
}
);
Edit: I realize now that I only answered half of your question. I'm afraid I have no apparent answer to the selection box. I suspect that you can use addRectangle or, in a worst case scenario, addFixPanel that lets you add a transparent <div> over your map canvas (and then trigger mouse events for that).
Here is one way to do it with Google Maps API 3's overlay editable feature.
Google Maps Overlay Editable
If your question is "How to select multiple markers with a rectangle", you can do something like this:
var markers = []; // This array must be filled with your data
var rectangles = [];
var triggeredMarkers = [];
google.maps.event.addListener(drawingManager, 'rectanglecomplete', updateSelection);
function updateSelection(rectangle){
var lat_max = rectangle.getBounds().getNorthEast().lat();
var lat_min = rectangle.getBounds().getSouthWest().lat();
var lng_max = rectangle.getBounds().getNorthEast().lng();
var lng_min = rectangle.getBounds().getSouthWest().lng();
rectangles.push(rectangle);
for(var i=0;i<markers.length;i++){
if((lat_min < markers[i].getPosition().lat() ? (markers[i].getPosition().lat() < lat_max ? true:false):false)
&& (lng_min < markers[i].getPosition().lng() ? (markers[i].getPosition().lng() < lng_max ? true:false):false)){
triggeredMarkers.push(markers[i]);
}
}
}
The rectangles array is used to hold rectangles in order to be able to erase them later.
But if you just want a simple function that handle Polygons, there is this one that really can be helpful for you. It can be used like this:
var markers = [];
var polygones = [];
var triggeredMarkers = [];
google.maps.event.addListener(drawingManager, 'polygoncomplete', updateSelection);
function updateSelection(polygon){
polygones.push(polygon);
for(var i=0;i<markers.length;i++){
if(google.maps.geometry.poly.containsLocation(markers[i].getPosition(),polygon)){
triggeredMarkers.push(markers[i]);
}
}
}
For rectangles and circles there's this answer that can help you.
I am using markerCLusterer V3 on a db file from Filemaker to generate a (semi-live) map of current delivery locations, based off of addresses. Grabbing the lat/long from Google and populating those
fields is no problem. Generating the map via markerClusterer is no problem. I am even hosting the JS locally so that I can change the maxZoom variable to break the clusters apart above max zoom, so that I can see multiple markers. However, with the markers at exactly the same lat / long, I can only see the last one entered. I would like to integrate OverlappingMarkerSpiderfier into this JS so that after I zoom in past the maxZoom, the markers would "spider" apart to see the markers (as an example, multiple pieces of equipment being delivered to the same address). I can't find any info here on on the web of how to do this. It's either that simple and I'm missing it or it hasn't been done yet. Thanks in advance for any help!
I'm using:
MarkerClustererPlus-2.0.14 and
OverlappingMarkerSpiderfier-version-??
At first only the clustering works, clicking on a cluster, zooms in but 2 or more markers on the exact same point still stay a cluster even when zoomed in to the maximum. Unfortunately no spiderfier showed up :-(.
But than a noticed the setMaxZoom() method on markerClusterPlus. When setting this too your appropriate zoom level (15 for me) spiderfier takes over beyond the zoom level. It looks like markerClusters says it ain't my business anymore from here on it's up to spiderfier :-).
Setting the max zoom will fix the problem:
minClusterZoom = 14;
markerCluster.setMaxZoom(minClusterZoom);
but for viewing purposes you may want to create a clusterclick listener to prevent it from zooming in really close on a cluster of points at the same location (clicking a cluster set the bounds of the map to cover the points in the cluster; if all points are at the same location it will zoom in all the way, which tends to look bad):
google.maps.event.addListener(markerCluster, 'clusterclick', function(cluster) {
map.fitBounds(cluster.getBounds()); // Fit the bounds of the cluster clicked on
if( map.getZoom() > minClusterZoom+1 ) // If zoomed in past 15 (first level without clustering), zoom out to 15
map.setZoom(minClusterZoom+1);
});
Integrating Spiderfier JS into markerClusterer
Download the oms.min.js file from here
Download the markerClusterer.js and the image folder from here
In order to make both work together you only need to add a maxZoom to the clusterMarker object
new MarkerClusterer(map, clusterMarker, {imagePath: 'images/m', maxZoom: 15});
(Zoomlevel 0 is the complete earth, and 20 is pretty close to the ground). This means that if you zoom into the map further as zoom level 15 (for example if you click on a cluster) then the clusters are not shown anymore. If you now click on markers that are on the exact same location (or close to each other) Spiderfier JS will trigger.
It follows now a minimal working example. I made some comments in the code so I think its self-explanatory, but here are some things to mention:
Replace YOUR_API_KEY with your api key
Make sure to load oms.min.js after you loaded the google maps api
Example:
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8" />
<script src="https://maps.googleapis.com/maps/apijs?key=YOUR_API_KEY">
</script>
<script src="oms.min.js"></script>
<script src="markerclusterer.js"></script>
<script>
window.onload = function() {
// cluster marker
var clusterMarker = [];
var map = new google.maps.Map(document.getElementById('map'), {
center: new google.maps.LatLng( 50, 3),
zoom: 6,
mapTypeId: 'terrain'
});
// Create infowindow
var infoWindow = new google.maps.InfoWindow();
// Create OverlappingMarkerSpiderfier instsance
var oms = new OverlappingMarkerSpiderfier(map,
{markersWontMove: true, markersWontHide: true});
// This is necessary to make the Spiderfy work
oms.addListener('click', function(marker) {
infoWindow.setContent(marker.desc);
infoWindow.open(map, marker);
});
// Some sample data
var sampleData = [{lat:50, lng:3}, {lat:50, lng:3}, {lat:50, lng:7}];
for (var i = 0; i < sampleData.length; i ++) {
var point = sampleData[i];
var location = new google.maps.LatLng(point.lat, point.lng);
// create marker at location
var marker = new google.maps.Marker({
position: location,
map: map
});
// text to appear in window
marker.desc = "Number "+i;
// needed to make Spiderfy work
oms.addMarker(marker);
// needed to cluster marker
clusterMarker.push(marker);
}
new MarkerClusterer(map, clusterMarker, {imagePath: 'images/m', maxZoom: 15});
}
</script>
</head>
<body><div id="map" style='width:400px;height:400px;'></div></body></html>
Recommendation
If you are starting from scratch, I would recommend to use the JS Libary Leaflet. Because this library provides you with the LeafletMarkerCluster plugin which is basically markercluster with Spiderfier integrated, and a lot of other cool stuff.
Advantage:
Cluster look really nice
Leaflet really easy to use and looks pretty
You do not need to customize the code, because Spiderfier and markerCluster already integrated
Some fancy other stuff: Like showing the border on hover of a region where marker are spread.
You can freely choose your map-tiles-provider and are no longer restricted to google maps (possible providers here)
Downsites:
You may need to invest 30min to learn and use the Leaflet API instead of the Google API
If you want to use Google Map Tiles, then you need to use this plugin, because you are only allowed to use the Google Tiles when using the Google API. This plugin is a wrapper for the Google API.
Here is an example code:
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8" />
<link rel="stylesheet" href="http://cdn.leafletjs.com/leaflet-0.7/leaflet.css" />
<script src="http://cdn.leafletjs.com/leaflet-0.7/leaflet.js"></script>
<link rel="stylesheet" href="leaflet/dist/MarkerCluster.css" />
<link rel="stylesheet" href="leaflet/dist/MarkerCluster.Default.css" />
<script src="leaflet/dist/leaflet.markercluster-src.js"></script>
<script>
$(document).ready(function(){
var tiles = L.tileLayer(***);//Depending on your tile provider
var map = new L.Map('map', {center: latlng, zoom: 1, layers: [tiles]});
var markers = new L.MarkerClusterGroup({
removeOutsideVisibleBounds: true,
spiderfyDistanceMultiplier: 2,
maxClusterRadius: 20
});
var markersList = [];
var sampleData = [{lat:50, lng:3}, {lat:50, lng:3}, {lat:50, lng:7}];
for (var i = 0; i < sampleData.length; i ++) {
var point = sampleData[i];
var location = new L.LatLng(point.lat, point.lng);
// create marker at location
var m = new L.Marker(location);
m.bindPopup("Number" +i); //Text to appear in window
markersList.push(m);
markers.addLayer(m);
}
var bounds = markers.getBounds();
map.fitBounds(bounds)
map.addLayer(markers);
}
</head>
<body><div id="map" style='width:400px;height:400px;'></div></body></html>
I came across this post because I was looking for the exact same thing, but lucky for me I have made it work!
I honestly didn't do anything special, I followed the integration guide for MarkerClusterer, and then followed the integration guide for OverlappingMarkerSpiderfier and they work flawlessly together.
When I click/zoom in on a cluster of properties that are all at the same address, initially it just shows the "top" marker, but when I click it, they Spiderfy just like you'd want them too!
What specific result are you getting when you try to use the two scripts together?
var markerClusterer = new MarkerClusterer(map, myMarkers, {
maxZoom: 15,
zoomOnClick: false
});
//zoom 0 corresponds to a map of the Earth fully zoomed out, 20 is closeup
//markerCluster goes away after zoom
//turn off zoom on click or spiderfy won't work
I've happily implemented v2 of Google maps to my site without a hitch, I also successfully perform a drive directions using GDirections.load().
What I need to do is stop the popup of the mini map when you select a particular step in the routing directions. So when the user clicks on say "step 3", instead of the default popup showing a mini map, I'd like to add a custom icon to that position.
Hope it makes sense
Thanks in advance guys.
You need to add a handler on the GDirections object for the addoverlay event:
GEvent.addListener(gdir, "addoverlay", onGDirectionsAddOverlay);
When your onGDirectionsAddOverlay handler is called you can iterate through the new markers and replace them with copies that open your custom info window:
for (var i = 0; i <= gdir.getNumRoutes(); i++)
{
var originalMarker = gdir.getMarker(i);
latLngs[i] = originalMarker.getLatLng();
icons[i] = originalMarker.getIcon();
newMarkers[i] = new GMarker(latLngs[i], { icon: icons[i], draggable: true, title: 'Kan flyttes' });
map.addOverlay(newMarkers[i]);
// add stuff to your newMarkers[i] click event...
// ..
// Now we can remove the original marker safely
map.removeOverlay(originalMarker);
}