Bootstrap4 offcanvas example:10.10.19

html:
  <body>
    <nav class="navbar navbar-expand-lg fixed-top navbar-dark bg-dark">
      <button class="navbar-toggler ml-auto p-0 border-0" type="button" data-toggle="offcanvas"><span class="navbar-toggler-icon"></span></button>
      <div class="navbar-collapse offcanvas-collapse" id="navbarsExampleDefault">
        <ul class="navbar-nav mr-auto">
          <li class="nav-item active">
            <a class="nav-link" href="#">Dashboard <span class="sr-only">(current)</span></a>
          </li>
          <li class="nav-item">
            <a class="nav-link" href="#">Notifications</a>
          </li>
          <li class="nav-item">
            <a class="nav-link" href="#">Profile</a>
          </li>
          <li class="nav-item">
            <a class="nav-link" href="#">Switch account</a>
          </li>
          <li class="nav-item dropdown">
            <a class="nav-link dropdown-toggle" href="https://example.com" id="dropdown01" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Settings</a>
            <div class="dropdown-menu" aria-labelledby="dropdown01">
              <a class="dropdown-item" href="#">Action</a>
              <a class="dropdown-item" href="#">Another action</a>
              <a class="dropdown-item" href="#">Something else here</a>
            </div>
          </li>
        </ul>
      </div>
    </nav>

css:

html,                                                                                                                                                                                                                                                                                                                                                                  
body {
  overflow-x: hidden; /* Prevent scroll on narrow devices */
}

@media (max-width: 991.98px) {
  .offcanvas-collapse {
    position: fixed;
    top: 56px; /* Height of navbar */
    bottom: 0;
    left: 100%;
    right:0;
    width: 100%;
    padding-right: 1rem;
    padding-left: 1rem;
    overflow-y: auto;
    visibility: hidden;
    background-color: #343a40;
    transition-timing-function: ease-in-out;
    transition-duration: .3s;
    transition-property: left, visibility;
  }
  .offcanvas-collapse.open {
    left: 0;
    visibility: visible;
  }
}

.nav-scroller {
  position: relative;
  z-index: 2;
  height: 2.75rem;
  overflow-y: hidden;
}

.nav-scroller .nav {
  display: -ms-flexbox;
  display: flex;
  -ms-flex-wrap: nowrap;
  flex-wrap: nowrap;
  padding-bottom: 1rem;
  margin-top: -1px;
  overflow-x: auto;
  color: rgba(255, 255, 255, .75);
  text-align: center;
  white-space: nowrap;
  -webkit-overflow-scrolling: touch;
}

.nav-underline .nav-link {
  padding-top: .75rem;
  padding-bottom: .75rem;
  font-size: .875rem;
  color: #6c757d;
}

.nav-underline .nav-link:hover {
  color: #007bff;
}

.nav-underline .active {
  font-weight: 500;
  color: #343a40;
}

.text-white-50 { color: rgba(255, 255, 255, .5); }

.bg-purple { background-color: #6f42c1; }

.lh-100 { line-height: 1; }
.lh-125 { line-height: 1.25; }
.lh-150 { line-height: 1.5; }

javascript:

jQuery('[data-toggle="offcanvas"]').on('click', function () {
   console.log('xxxx');
  jQuery('.offcanvas-collapse').toggleClass('open');
  });

https://getbootstrap.com/docs/4.3/examples/offcanvas/

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Bootstrap4 offcanvas example:10.10.19

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