Google Maps API 3

CHAPTER 9 ■ DEALING WITH MASSIVE NUMBERS OF MARKERS
The options object is an object literal that you just pass along when creating a new MarkerManager
object. So if you want to set the maxZoom to 15, the borderPadding to 0, and the trackMarkers to true, you
do it like this:
var mgr = new MarkerManager(map, {
'maxZoom': 15,
'borderPadding': 0,
'trackMarkers': true
});
In this example, I changed all the properties, but you don’t have to do that. You can just define those
that you want to change. For example, if I only want to change the trackMarkers property to true, I write
it like this:
var mgr = new MarkerManager(map, {
'trackMarkers': true
});
Further Resources
We’ve been looking at some of the features of MarkerManager library, but there’s even more to it. The
library features a number of methods that you can use to show and hide markers, clear markers, and
other useful things. For a full description of all the methods available, check out the reference
documentation at the file repository at http://google-maps-utility-libraryv3.googlecode.com/svn/tags/markermanager/1.0/docs/reference.html.
Summary
In this chapter, you learned about different ways of dealing with a lot of markers. The best solution is
often to not show all markers at the same time. You can do this by adding filtering, searching or
clustering capabilities. Sometimes even not using markers at all is a solution. If none of these
approaches is a viable solution to the problem, then at least you can resort to using the utility library
MarkerManager, which will increase the overall performance of the map by only adding those
markers that are currently within the viewport.
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