Google Maps Display:None Problem
I ran into this same problem today and eventually found this at the official Google Maps Javascript API V3 Reference:
Developers should trigger this event on the map when the div changes size:
google.maps.event.trigger(map, 'resize')
.
As display:none
is equivalent to leaving the <div>
with size 0, changing it to display:block
becomes in fact a change of size, making therefore necessary to trigger the map resize event.
Worked like a charm for me.
UPDATE 2018-05-22
With a new renderer release in version 3.32 of Maps JavaScript API the resize event is no longer a part of Map
class.
The documentation states
When the map is resized, the map center is fixed
The full-screen control now preserves center.
There is no longer any need to trigger the resize event manually.
source: https://developers.google.com/maps/documentation/javascript/new-renderer
google.maps.event.trigger(map, "resize");
doesn't have any effect starting from version 3.32
This problems also happens with the jquery tabs, instead of applying "display:none", you can try hidding the map in this way:
Add the following styles when you are trying to hide the map, instead of using display:none
position: absolute;
left: -100%;
You can also add transitions like: transition: left 1s ease;
You can try with google event listener triggering it after you display the map:
<script type="text/javascript">
var map; //I placed here the map variable so other functions can see it.
var latlng = new google.maps.LatLng(-27.999673,153.42855);
// in order to center again the map...
function initialize() {
var myOptions = {
zoom: 15,
center: latlng,
mapTypeId: google.maps.MapTypeId.ROADMAP,
mapTypeControl: true,
mapTypeControlOptions: {
style: google.maps.MapTypeControlStyle.DROPDOWN_MENU
}
};
map = new google.maps.Map(document.getElementById("map_canvas"),myOptions);
var contentString = 'blah';
var infowindow = new google.maps.InfoWindow({
content: contentString
});
var marker = new google.maps.Marker({
position: latlng,
map: map
});
google.maps.event.addListener(marker, 'click', function() {
infowindow.open(map,marker);
});
}
google.maps.event.addDomListener(window, 'load', initialize);
</script>
<script type="text/javascript">
function toggleDiv1(viewmap){
if(document.getElementById(viewmap).style.display == 'block'){
document.getElementById(viewmap).style.display = 'none';
}else{
document.getElementById(viewmap).style.display = 'block';
//here is where your map is being displayed again, try here
// to trigger the resize event.
google.maps.event.trigger(map, 'resize');
map.setCenter(latlng);
}
}
function toggleDiv2(hidemap){
if(document.getElementById(hidemap).style.display == 'none'){
document.getElementById(hidemap).style.display = 'block';
}else{
document.getElementById(hidemap).style.display = 'none';
}
}
</script>
The problem with size of the map is that it needs to know the size of the div that it is rendering to. At the moment you are initializing a map on document load when your div is hidden so the map cannot calculate its size correctly - to solve this problem you simply need to initialize it first time you show the div (not onload).
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 TRANSITIONAL//EN">
<html>
<head>
<title></title>
<style type="text/css">
#viewmap {
position:relative;
width:944px;
float:left;
display:none;
}
#hidemap {
position:relative;
width:944px;
float:left;
display:block;
}
#map_canvas {
position:relative;
float:left;
width:944px;
height:300px;
}
</style>
<script type="text/javascript"
src="http://maps.google.com/maps/api/js?v=3.2&sensor=false">
</script>
<script type="text/javascript">
//your global map object
var map = null;
function initialize() {
var latlng = new google.maps.LatLng(-27.999673,153.42855);
var myOptions = {
zoom: 15,
center: latlng,
mapTypeId: google.maps.MapTypeId.ROADMAP,
mapTypeControl: true,
mapTypeControlOptions: {
style: google.maps.MapTypeControlStyle.DROPDOWN_MENU
}
};
map = new google.maps.Map(document.getElementById("map_canvas"),myOptions);
var contentString = 'blah';
var infowindow = new google.maps.InfoWindow({
content: contentString
});
var marker = new google.maps.Marker({
position: latlng,
map: map
});
google.maps.event.addListener(marker, 'click', function() {
infowindow.open(map,marker);
});
}
function toggleDiv1(viewmap){
if(document.getElementById(viewmap).style.display == 'block'){
document.getElementById(viewmap).style.display = 'none';
}else{
document.getElementById(viewmap).style.display = 'block';
//check if map object exists (it is created by you initialize function), if not initialize it
if (!map) {
initialize();
}
}
}
function toggleDiv2(hidemap){
if(document.getElementById(hidemap).style.display == 'none'){
document.getElementById(hidemap).style.display = 'block';
}else{
document.getElementById(hidemap).style.display = 'none';
}
}
</script>
</head>
<body>
<div id="viewmap">
<a href="#" onmousedown="toggleDiv1('viewmap'); toggleDiv2('hidemap');">Hide map</a>
<div id="map_canvas"></div>
</div>
<div id="hidemap">
<a href="#" onmousedown="toggleDiv1('viewmap'); toggleDiv2('hidemap');">View map</a>
</div>
</body>
</html>