Placing a MapLabel on top of a Polygon in Google Maps V3

Question

I'm trying to place a MapLabel on top of a Polygon in Google Maps V3. I've tried to set the MapLabel zIndex to 2 and the Polygon zIndex to 1 without any luck. Isn't this possible since the Polygon doesn't really follow zIndex?

I've created a jsFiddle for you guys to check out: http://jsfiddle.net/7wLWe/1/

Solution: In maplabel.js change:

mapPane.appendChild(canvas);

to:

floatPane.appendChild(canvas);

The reason is because floatPane is above all map layers (pane 6)

http://code.google.com/apis/maps/documentation/javascript/reference.html#OverlayView

Solution 1

This is probably a late find.. but hope someone would find this useful.

If you don't want to use floatPane (John's Solution) as this will be always on top of everything, and want to give a custom zIndex.. Edit the maplabel.js. Add the following line just before the end of MapLabel.prototype.onAdd = function() {

if (canvas.parentNode != null) {
    canvas.parentNode.style.zIndex = style.zIndex;
}

Now you can pass zIndex while creating a maplabel:

var mapLabel = new MapLabel({
    text: "abc",
    position: center,
    map: map,
    fontSize: 8,
    align: 'left',
    zIndex: 15
});

Solution 2

If you don't want to touch maplabel.js, you can add this function to change the z-index of the parent of the labels (although if you have other canvas elements, you may need to alter the function):

//change the z-index of the canvas elements parents to move them above polygon layer
google.maps.event.addListenerOnce(map, 'idle', function(){
//var canvasElements = document.getElementsByTagName('canvas');//plain js to get the elements
var canvasElements = jQuery('canvas'); //jquery for easy cross-browser support
    for(var i=0; i<canvasElements.length; i++){
        canvasElements[i].parentNode.style.zIndex = 9999;
    }

});

Comments

[duncan]

You should post your solution as an answer, and accept it, to help others in the future

[hammurabi]

Change to markerLayer instead of floatPane if you use draggable or editable.

[Dom Vinyard]

I can't get this to work. The parentNode style index change is showing correctly in the inspector but the labels remain hidden.