如何自动折叠Bootstrap 4侧栏以显示较小的屏幕？

Question

This is my current code, I've managed to hide the sidebar with the collapse button, but I want it to only collapse for small devices, like the bootstrap navbar does.

 <link href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" rel="stylesheet"/> <div class="container"> <div class="container-fluid"> <div class="row"> <div class="col-md-3 px-1 bg-light" id="sidebar"> <div class="py-2 sticky-top flex-grow-1"> <div class="nav flex-sm-column"> <h2 class="text-center">PROFILE</h2> <button class="btn btn-primary" type="button" data-toggle="collapse" data-target=".collapse" aria-expanded="true" aria-controls="collapse">Toggle both elements</button> <div class="collapse navbar-collapse"> <a href="" class="nav-link">LINK</a> <a href="" class="nav-link">LINK</a> <a href="" class="nav-link">LINK</a> </div> </div> </div> </div> <div class="col-sm-9" id="main"> ***PAGE DATA </div> </div> </div> </div> 

Answer 1

You could use a media query to do this:

@media (max-width: 568px) {
  #sidebar {
    display: none;
  }
}

Answer 2

I think if you use this it will help solve your problem. You can learn more from here W3SCHOOLS

   @media only screen and (min-width: 320px) and (max-width: 768px) {
  .nav {
    width:100%;
  }
  .nav-link {
    width:100%;
    float:none;
  }
}

Answer 3

This is what you are looking for. What the others have written above will work but it is harder than just using bootstrap classed.

https://getbootstrap.com/docs/4.1/utilities/display/