Sample code showing how to create a contact listener in box2d.js

ContactListenerSample.js

//sample code showing how to create a contact listener with
//kripken's Javascript port of Box2D.js
//https://github.com/kripken/box2d.js/

var gravity = new Box2D.b2Vec2(0.0, 10.0);
var world = new Box2D.b2World(gravity);

var contactListener = new Box2D.JSContactListener();

contactListener.BeginContact = function(contact)
{
	contact = Box2D.wrapPointer(contact, Box2D.b2Contact);
	//[contact logic here]
}

contactListener.EndContact = function(contact)
{
	contact = Box2D.wrapPointer(contact, Box2D.b2Contact);
	//[contact logic here]
}

contactListener.PreSolve = function(contact, oldManifold)
{
	contact = Box2D.wrapPointer(contact, Box2D.b2Contact);
	oldManifold = Box2D.wrapPointer(oldManifold, Box2D.b2Manifold);
	//[contact logic here]
}

contactListener.PostSolve = function(contact, impulse)
{
	contact = Box2D.wrapPointer(contact, Box2D.b2Contact);
	impulse = Box2D.wrapPointer(impulse, Box2D.b2ContactImpulse);
	//[contact logic here]
}

world.SetContactListener(contactListener);

Thanks, this helps. I think the reason I wasn't able to get ahold of the "JSContactListener" was because it wasn't apart of the "b2" namespace.