directions.js

geocode: function(origin, destination) {
        this._geocode(origin, L.bind(function(err, originResult) {
            if (err) {
                return this.fire('error', err);
            }
            this.fire('origin', {origin: originResult, invisible: true});

            this._geocode(destination, L.bind(function(err, destinationResult) {
                if (err) return this.fire('error', err);
                this.fire('destination', {destination: destinationResult, invisible: true});
            }, this));
        }, this));
        return this;
    },