Example of changing view through attach/detach

gistfile1.js

_changeView: function (newView, options) {
    console.log("app::_changeView");
    options = options || {};
    options.renderFirst = (typeof options.renderFirst !== "undefined") ? options.renderFirst : true;

    if (this._currentView !== null && this._currentView === newView) {
        console.log("app::_changeView - no change needed");
        return;
    }

    if (this._currentView !== null) {
        this._currentView.$el.detach();
    }

    this._currentView = newView;
    if (options.renderFirst) {
        this._currentView.render();
    }

    this._containerNode.append(this._currentView.$el);
}

gistfile2.js

handleContent: function (page) {
    console.log("app::handleContent - page: " + page);
    var view = this._views[page],
        ViewCtr;

    if (typeof view === "undefined") {
        ViewCtr = this.contentViewConstructors[page];
        view = this._views[page] = new ViewCtr ();
    }
    this._changeView(view);
}