Google Map V3 not centering, displays only part of map

Question

I'm developing a jQTouch-based app for the iPhone and part of it uses the Google Maps API (V3). I want to be able to pass the geolocation coordinates to the map and have it center the location with a marker. What I'm getting now is the map at the proper zoom level but the desired center-point appears in the upper-righthand corner. It's also showing only about a third of the map area (the rest is gray) and it behaves somewhat erratically when you pan or zoom. Here's the code:

var coords = { latitude : "35.510630", longitude : "-79.255374" };
var latlng = new google.maps.LatLng(coords.latitude, coords.longitude);
var myOptions = {
    zoom: 12,
    center: latlng,
    mapTypeId: google.maps.MapTypeId.ROADMAP
};
var map = new google.maps.Map($("#map_canvas").get(0), myOptions);
var marker = new google.maps.Marker({
    position: latlng, 
    map: map, 
});     

BTW: It looks and behaves the same on other platforms/browsers as well.

Thoughts?

Thanks in advance,

Mark

---

Added Here's a link that'll show exactly what's happening: Screen shot of iPhone emulator

Answer 1

I'm guessing you're using AJAX to display the map, or have the map hidden at some point and then display it based on an action?

In this case Google doesn't know the size of the map container and it will draw only part of the map, usually off-centered.

To fix this, resize the map, then re-center on your lat/lng. Something like this:

google.maps.event.trigger(map, 'resize');

// Recenter the map now that it's been redrawn               
var reCenter = new google.maps.LatLng(yourLat, yourLng);
map.setCenter(reCenter);

Answer 2

The solution for getting the map renedered correctly is to execute your Maps-Code on pageAnimationEnd-Event of jQTouch.

Example within Page #div:

    <div id="map_canvas" style="width:100%; height:100%; min-height:400px; background:#ccc;"></div>
    <script type="text/javascript"> 

    $('#map').bind('pageAnimationEnd', function() {

        var mapOptions = {
            zoom: 13,
            disableDefaultUI: true,
            mapTypeId: google.maps.MapTypeId.ROADMAP
        };
        var map =  new google.maps.Map(document.getElementById('map_canvas'), mapOptions);

        if(navigator.geolocation) {
            navigator.geolocation.getCurrentPosition(function(position) {
                    var pos = new google.maps.LatLng(position.coords.latitude, position.coords.longitude)

                    var marker = new google.maps.Marker({
                        map: map,
                        draggable: false,
                        position: pos
                    });

                    map.setCenter(pos);
                }, function() {
                    console.log('Device Environment Capable of Geolocation but not Available - Geolocation failed');
                }
            );
        } else {
            console.log('Device Environment Not Capable of Geolocation - Geolocation failed');
        }
    });
    </script>

Though, i find myself having trouble to make the Map fullscreen-height. Any help in this case is appreciated. Note that im using DataZombies bars extension for fixed footer navigation.