example using underscore binding on events to keep class scope

eventClick.js

// When using underscore this passes the class scope into the event handler (callback function)
// rather than having the click event scope in the handler (callback function)
Navigation.prototype._addClickEvent = function () {
    var handler = _(this._handleEventClick).bind(this);
    this.$nav_items.on('click', handler);
};

// Here this refers to Navigation.prototype rather than the event which gets passed in
Navigation.prototype._handleEventClick = function (evt) {
    evt.preventDefault();

    this.$currentTarget = $(evt.currentTarget);
    this.selected_nav = this.$currentTarget.data('section');
    this.selected_nav_slug = this.$currentTarget.data('slug');
};