Google Maps API v3 - Add marker after initialize - javascript

My end-goal: Load only map markers within current map viewport and if map is moved, reload map markers within new viewport.
As far as I know, to do this I need the map corner coordinates which I can only load once the map is idle, that way I can pass these coords to my PHP file to query my database and output the XML for the map markers within the corners (I'm trying to reduce the stress on my DB by restricting the query to only the relevant map area). I'm having trouble adding a dummy marker post-initialize (see code below). It's simply not loading the marker, everything else works fine.
<script src="https://maps.googleapis.com/maps/api/js?v=3.exp"></script>
<script>
function initialize() {
var map = new google.maps.Map(document.getElementById("googleMap"), {
zoom: 12,
center: new google.maps.LatLng(40.779502, -73.967857)
});
google.maps.event.addListener(map, 'idle', function() {
/*bounds = map.getBounds();
ne = bounds.getNorthEast();
sw = bounds.getSouthWest();
window.top.showBounds();*/
TestMarker();
});
}
function addMarker(location) {
marker = new google.maps.Marker({
position: location,
map: map
});
}
// Testing the addMarker function
function TestMarker() {
CentralPark = new google.maps.LatLng(40.779502, -73.967857);
addMarker(CentralPark);
}
google.maps.event.addDomListener(window, 'load', initialize);
</script>

You don't need to wait for the idle event. The map bounds are available the first time the 'bounds_changed' event fires.
Wait for the bounds_changed event; whenever the bounds changes (including the first time), then update your markers on the map.
working fiddle
code snippet:
var map;
var bounds;
function initialize() {
map = new google.maps.Map(document.getElementById("googleMap"), {
zoom: 12,
center: new google.maps.LatLng(40.779502, -73.967857)
});
google.maps.event.addListener(map, 'bounds_changed', function() {
bounds = map.getBounds();
ne = bounds.getNorthEast();
sw = bounds.getSouthWest();
document.getElementById('mapBounds').innerHTML = bounds.toUrlValue(6);
TestMarker();
});
}
function addMarker(location) {
marker = new google.maps.Marker({
position: location,
map: map
});
}
// Testing the addMarker function
function TestMarker() {
CentralPark = new google.maps.LatLng(40.779502, -73.967857);
addMarker(CentralPark);
}
google.maps.event.addDomListener(window, 'load', initialize);
html,
body,
#googleMap {
height: 100%;
width: 100%;
margin: 0px;
padding: 0px
}
<script src="https://maps.googleapis.com/maps/api/js?key=AIzaSyCkUOdZ5y7hMm0yrcCQoCvLwzdM6M8s5qk"></script>
<div id="mapBounds"></div>
<div id="googleMap" style="border: 2px solid #3872ac;"></div>

Why don't you add another listener event inside your initialize function:
google.maps.event.addListener(map, 'dragend', function(){
var latlng = new google.maps.LatLng(35, -90);
var marker = new google.maps.Marker({
position: latlng
});
marker.setMap(map)
});

Google Maps Marker adding is very simple thing.I've created an example, for you.In this page there is some basic examples of google maps markers
http://www.w3docs.com/learn-javascript/google-maps-markers.html

Related

Implement google place search and save marker to database in google map

What I want to achieve:
I want to display a search box in google map. When a user search a location, result is displayed in map box. On the map, when a user RightClick, I want to store the marker in database.
Resource I tried to implement
storing marker to database:
https://www.sanwebe.com/2013/10/google-map-v3-editing-saving-marker-in-database
displaying search box in map
https://developers.google.com/maps/documentation/javascript/examples/places-searchbox
I tried to implement these two as one: here is my minimal code
var mapCenter = new google.maps.LatLng(27.7172, 85.3240);
var map;
google.maps.event.addDomListener(window, 'load', map_initialize);
function map_initialize() {
var map = new google.maps.Map(document.getElementById('map'), {
center: mapCenter,
zoom: 13,
mapTypeId: 'roadmap'
});
google.maps.event.addListener(map, 'rightclick', function(event) {
create_marker(event.latLng);
});
}
function create_marker(MapPos) {
var marker = new google.maps.Marker({
position: MapPos,
map: map
});
}
#map {
height: 200px;
}
<div id="map"></div>
<script src="https://maps.googleapis.com/maps/api/js"></script>
With this code when I right click on the map, nothing happens i.e. neither the marker shows nor any error.
The map variable needs to be accessible from your create_marker function, therefore you declared it outside of your other functions. But also inside the map_initialize function. Remove the var declaration from there and it will work.
I have edited your original question to include a MCVE which means that I removed 90% of your code to keep only what you were after: adding a marker on right click.
Please take that as a suggestion for how to write your next questions.
var mapCenter = new google.maps.LatLng(27.7172, 85.3240);
google.maps.event.addDomListener(window, 'load', map_initialize);
function map_initialize() {
map = new google.maps.Map(document.getElementById('map'), {
center: mapCenter,
zoom: 13,
mapTypeId: 'roadmap'
});
google.maps.event.addListener(map, 'rightclick', function(event) {
create_marker(event.latLng);
});
}
function create_marker(MapPos) {
var marker = new google.maps.Marker({
position: MapPos,
map: map
});
}
#map {
height: 200px;
}
<div id="map"></div>
<script src="https://maps.googleapis.com/maps/api/js"></script>

How to change marker postion on Google Map API

I am using google map on my site and here is google map code:
<script src='https://maps.googleapis.com/maps/api/js?v=3.exp'></script>
<div style='overflow:hidden;height:440px;width:700px;'>
<div id='gmap_canvas' style='height:440px;width:700px;'></div>
<style>
#gmap_canvas img {
max-width: none!important;
background: none!important
}
</style>
</div>
<script type='text/javascript'>
function init_map() {
var myOptions = {
zoom: 10,
center: new google.maps.LatLng(51.5073509, -0.12775829999998223),
mapTypeId: google.maps.MapTypeId.ROADMAP
};
map = new google.maps.Map(document.getElementById('gmap_canvas'), myOptions);
marker = new google.maps.Marker({
map: map,
position: new google.maps.LatLng(51.5073509, -0.12775829999998223)
});
infowindow = new google.maps.InfoWindow({
content: '<strong>Title</strong><br>London, United Kingdom<br>'
});
google.maps.event.addListener(marker, 'click', function() {
infowindow.open(map, marker);
});
infowindow.open(map, marker);
}
google.maps.event.addDomListener(window, 'load', init_map);
</script>
and getting this map output:
Currently, I have a div which highlight in Red color and marker is displaying beside Red area so I want to move to the left side.
Now I want to move marker on left side and don't want to use center position because I am showing contents on red area on below example:
Any idea how to move the marker on the top left side?
Thanks.
You can easly shift the map assigning a new center .. (the new coord are for sample)
var newCenter = new google.maps.LatLng(50.5073509, 0.1200)
map.setCenter(newCenter);
You can change the the marker by javascript function
function changeMarkerPosition(marker) {
var latlng = new google.maps.LatLng(-24.397, 140.644);
marker.setPosition(latlng);
}
For more information See this link

Google Maps click event places marker but can't zoom on dlbclick event

I need people to be able to click on the map, place a marker, update the input fields, and still be able to dbl click to zoom in more even after the marker is set.
What I have now does everything besides allow a dblclick event to zoom.
var map;
var marker = null;
function initialize() {
var mapOptions = {
center: new google.maps.LatLng(39.639, -95.689),
zoom: 3
};
var map = new google.maps.Map(document.getElementById("map-canvas"),
mapOptions);
google.maps.event.addListener(map, 'click', function(event) {
$("#latcoord").val(event.latLng.lat());
$("#longcoord").val(event.latLng.lng());
if (marker) { marker.setMap(null); }
marker = new google.maps.Marker({ position: event.latLng, map: map});
});
}
google.maps.event.addDomListener(window, 'load', initialize);
Thanks!
set disableDoubleClickZoom to false
like this
map.set("disableDoubleClickZoom", false);

Markers not showing on google maps

I'm trying to show markers on my map. but it's not showing them.
this is the code I use:
var map;
var markers = new Array();
function initialize() {
var mapOptions = {
zoom: 12,
center: new google.maps.LatLng(27.9881, 86.9253),
};
var map = new google.maps.Map(document.getElementById('map-canvas'), mapOptions);
google.maps.event.addListener(map, 'click', addMarker);
}
function addMarker(event) {
markers.push(event.latLng);
marker = new google.maps.Marker({
position: event.latLng,
map: map
});
console.log(markers);
}
google.maps.event.addDomListener(window, 'load', initialize);
the console is logging on every click an new coordinate, so the function is called, and coordinates are passed. And I can't really see any problems in the marker code.
So can anyone see the problem?
map is a local variable, only visible inside initialize.
Use this instead of map when you set the map-property of the marker:
function addMarker(event) {
markers.push(event.latLng);
marker = new google.maps.Marker({
position: event.latLng,
map: this
});
}
Explanation:
the callback will be executed in the scope of the object that triggers the event. Here it is the Maps-instance(because the click-listener has been applied to the map ), this will refer to this object inside the callback.
markers.push(event.latLng);
Here you're pushing the latlng, not the marker.
markers is an array variable with global scope, whereas marker is a local variable.
In markers array you have to insert each inidividual marker and then process it.
function addMarker(event) {
var marker = new google.maps.Marker({
position: event.latLng,
map: map
});
markers.push(marker);
}

How do I show white pop up box on custom Google Map?

I currently have an array of places for a custom map that I am working on. I have been trying but cannot figure out how to add the 'click' popup box over a marker. I want the white box to display the name and have an option so that a person can choose 'get directions to here'. Does anyone know how I can achieve this with more then one marker?
<!DOCTYPE html>
<head>
<style type="text/css">
html { height: 100% }
body { height: 100%; margin: 0px; padding: 0px }
#map_canvas { height: 50% }
</style>
<script type="text/javascript"
src="http://maps.google.com/maps/api/js?sensor=true">
</script>
<script type="text/javascript">
var map;
var marker
function initialize() {
var latlng = new google.maps.LatLng(42.098687,-75.917974);
var restaurants = new Array();
restaurants = [
new google.maps.LatLng(42.898687,-75.917974),
new google.maps.LatLng(42.698687,-73.917974),
new google.maps.LatLng(42.198687,-75.917974),
new google.maps.LatLng(41.098687,-75.917974)
];
var myOptions = {
zoom: 3,
center: latlng,
mapTypeId: google.maps.MapTypeId.ROADMAP
};
var map = new google.maps.Map(document.getElementById("map_canvas"),
myOptions);
var i = 0;
for ( i <0; i < restaurants.length;i++ ){
var marker = new google.maps.Marker({
position: restaurants[i],
map:map,
title:"Testing!"
});
popupDirections(marker);
}
}
function popupDirections(marker) {
var infowindow = new google.maps.InfoWindow(
{ content: "tests: "
});
google.maps.event.addListener(marker, 'click', function() {
infowindow.open(map,marker);
});
}
</script>
</head>
<body onload="initialize()">
<div id="map_canvas" style="width:50%; height:50%"></div>
</body>
</html>
The pop-up box that you are talking about is called the info window in google map language.
GEvent.addListener(marker, "click", function() {
marker.openInfoWindowHtml("your contents");
});
The above code binds a click event with your marker and opens an info window with the specified text. here marker is the marker object.
Hope it helps.
The way to do this is to create one global infowindow and then reuse it again and again, this way the infowindow is just moved to each marker, and the content of the info window can be changed using the setContent method. Read here and there is a Google Demo accessable from the api reference site. I had the same problem when I was making a map for my site,
The following code should work:
<script type="text/javascript">
var map;
var marker;
var infowindow; //Global infowindow created
function initialize() {
var latlng = new google.maps.LatLng(42.098687,-75.917974);
var restaurants = new Array();
restaurants = [
new google.maps.LatLng(42.898687,-75.917974),
new google.maps.LatLng(42.698687,-73.917974),
new google.maps.LatLng(42.198687,-75.917974),
new google.maps.LatLng(41.098687,-75.917974)
];
var myOptions = {
zoom: 3,
center: latlng,
mapTypeId: google.maps.MapTypeId.ROADMAP
};
map = new google.maps.Map(document.getElementById("map_canvas"),
myOptions);
infowindow = new google.maps.InfoWindow({ //infowindow options set
maxWidth: 355
});
var i = 0;
for ( i <0; i < restaurants.length;i++ ){
marker = new google.maps.Marker({
position: restaurants[i],
map:map,
title:"Testing!"
});
popupDirections(marker);
}
}
function popupDirections(marker) {
//this function created listener listens for click on a marker
google.maps.event.addListener(marker, 'click', function() {
infowindow.setContent("Tests: "); //sets the content of your global infowindow to string "Tests: "
infowindow.open(map,marker); //then opens the infowindow at the marker
});
}
</script>
If you want separate content for each marker (which I assume you will) you can pass some content into the popupDirections() function, modified with a string for the content "html":
function popupDirections(marker, html) {
//this function created listener listens for click on a marker
google.maps.event.addListener(marker, 'click', function() {
infowindow.setContent(html); //sets the content of your global infowindow to string "Tests: "
infowindow.open(map,marker); //then opens the infowindow at the marker
});
}

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