First, we select all menu items with the querySelectorAll() method that returns a node list (rather than a single element like querySelector()). But I have one question: How can I get the same effect with third level menu, the tutorial is teaching me how to do this effect in the first and second level menu, but I need third level, I am working on this for several days but I can’t get it works. In this tutorial, We will implement collapsing responsive navigation bar using ASP.NET menu control and Twitter Bootstrap. Bootstrap 3 Second Level Menu Nav ⚠️ Looking for Bootstrap v4? Hello Friends, Today in this post, we’ll learn how to Create a Responsive Sidebar Menu with Submenu Using Bootstrap 4. recently I have shared a Glowing Circle Loading Animation Using HTML & CSS. but our today’s topic is Responsive Sidebar Menu with Submenu Using Bootstrap 4. Check also these menu templates . The only behaviour I almost always need to change is when the submenu should be displayed. Here's how to add this feature to your project: HTML. All the mentioned navbar examples consists of vertical and horizontal menus along with slideouts and dropdown. Lets start with the default view of ASP.NET Menu control as follows: