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@badsyntax
Created April 12, 2012 09:45
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Google Maps V3 Labelled Marker
/*
* An example of how to use a Google Map overlay to display a label on top of marker.
* This is a slight re-work of http://www.tdmarketing.co.nz/blog/2011/03/09/create-marker-with-custom-labels-in-google-maps-api-v3/
* I suggest you rather view that blog post, this code is pasted here purely for my own personal reference.
*/
var
point = {
lat: 37.8478115,
long: 15.2934327
},
marker = {
icon: {
url: 'images/icon-map-pin.png',
size: { x: 24, y: 39 }
},
shadow: {
url: 'images/icon-map-ping-shadow.png',
size: { x: 38, y: 47 }
}
},
markerIcon = new google.maps.MarkerImage(
marker.icon.url,
new google.maps.Size(marker.icon.size.x, marker.icon.size.y),
new google.maps.Point(0, 0)
),
markerShadow = new google.maps.MarkerImage(
marker.shadow.url,
new google.maps.Size(marker.shadow.size.x, marker.shadow.size.y),
new google.maps.Point(0, 0),
new google.maps.Point(7, 40)
);
// Our Custom Marker
var Marker = function(options){
google.maps.Marker.apply(this, arguments);
if (options.label) {
this.MarkerLabel = new MarkerLabel({
map: this.map,
marker: this,
text: options.label
});
this.MarkerLabel.bindTo('position', this, 'position');
}
};
Marker.prototype = $.extend(new google.maps.Marker(), {
// If we're adding/removing the marker from the map, we need to do the same for the marker label overlay
setMap: function(){
google.maps.Marker.prototype.setMap.apply(this, arguments);
(this.MarkerLabel) && this.MarkerLabel.setMap.apply(this.MarkerLabel, arguments);
}
});
// Our custom marker label overlay
var MarkerLabel = function(options) {
var self = this;
this.setValues(options);
// Create the label container
this.div = document.createElement('div');
this.div.className = 'map-marker-label';
// Trigger the marker click handler if clicking on the label
google.maps.event.addDomListener(this.div, 'click', function(e){
(e.stopPropagation) && e.stopPropagation();
google.maps.event.trigger(self.marker, 'click');
});
};
MarkerLabel.prototype = $.extend(new google.maps.OverlayView(), {
onAdd: function() {
this.getPanes().overlayImage.appendChild(this.div);
// Ensures the label is redrawn if the text or position is changed.
var self = this;
this.listeners = [
google.maps.event.addListener(this, 'position_changed', function() { self.draw(); }),
google.maps.event.addListener(this, 'text_changed', function() { self.draw(); }),
google.maps.event.addListener(this, 'zindex_changed', function() { self.draw(); })
];
},
onRemove: function() {
this.div.parentNode.removeChild(this.div);
// Label is removed from the map, stop updating its position/text
for (var i = 0, l = this.listeners.length; i < l; ++i) {
google.maps.event.removeListener(this.listeners[i]);
}
},
draw: function() {
var
text = String(this.get('text')),
markerSize = marker.icon.size,
position = this.getProjection().fromLatLngToDivPixel(this.get('position'));
this.div.innerHTML = text;
this.div.style.left = (position.x - (markerSize.x / 2)) - (text.length * 3) + 'px';
this.div.style.top = (position.y - markerSize.y) + 'px';
}
});
// Create the custom marker
var MyMarker = new Marker({
map: gMapInstance,
position: new google.maps.LatLng(point.lat, point.long),
icon: markerIcon,
shadow: markerShadow,
label: 'Label text'
});
@davidyell
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I belive you can simplify line 90 with
for (var i = 0; i < this.listeners.length; i++)

Also I think that $.extend() is a jQuery function, so external dependancy.

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