How to Pull Odometry Data from Robot using Rosbridge

edit

This is currently the piece of code in my rosbridge file that is to subscribe to /odom on my robot:

listener_Odom = new ROSLIB.Topic ({
    ros : ros,
    name : '/odom',
    messageType : 'nav_msgs/Odometry'
});

let odomPosition = {xPos : 0, yPos : 0};

listener_Odom.subscribe('/odom', function(message){
   console.log(`Received message on ${listener_Odom.name} : ${message.pose}`);

   let odomPosition = {
        xPos : message.pose.pose.position.x,
        yPos : message.pose.pose.position.y
    };
    updatePosition(odomPosition); //update position of tracker, ie. a canvas shape
});

The browser console does not even display my console.log message, neither do my xPos and yPos ever change after I launch the rosbridge websocket. Any observances on what I am doing wrong?

(The end goal is to make my JS canvas shape move in the same way as the robot being used.)