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

Answer 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
});

Answer 2

Great to see that you're using the MapLabel utility library!

As you've found out, the MapLabel sits in a different map pane. zIndex is only respected within a certain pane.

Answer 3

I sketched up this CodePen example utilizing the gmaps-labels class. It is based on the fiddle in the Q above and adds the ose of a LabelOverlay class. The class requires a new google.maps.LatLng, dimensions (in LatLng units) of a box centered around the label's point (If the label would overflow this box, hide it, and some CSS. Heres a code stub, check out the demo in the CodePen.

var MIN_BOX_H = 0.0346, 
    MIN_BOX_W = 0.121,
    MAX_BOX_H = 0.001, 
    MAX_BOX_W = 0.03;



var overlay1 = new LabelOverlay({
    ll      : myLatlng,

    minBoxH     : MIN_BOX_H,
    minBoxW     : MIN_BOX_W,

    maxBoxH     : MAX_BOX_H,
    maxBoxW     : MAX_BOX_W,

   ...

   label        : "I want on top",
   map      : map
});

Answer 4

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;
    }

});

Answer 5

var maplabel = new MapLabel....  
$(maplabel.getPanes().mapPane).css('z-index', maplabel.zIndex);

jQuery made it pretty simple for me without changing maplabel.js I also found an alternate solution

$(maplabel.getPanes().mapPane).addClass('map-pane');

and then defining the z-index in a stylesheet