How can I create sidebar menu and clickable sub menu with html css bootstrap?

Question

This is a piece of my code for sidebar menu.I want to create dashboard and drop down menu in left of screen. when I go on flower don't show it's sub menu. (i want clickable)

  <div class="navbar-default navbar-right sidebar">
                <div class="sidebar-nav navbar-collapse">
                    <ul class="nav-fall">
                        <li class="charj"><a href="">flower<i class="fa fa-angle-right arrow" aria-hidden="true"></i></a>
                            <ul class="nav-second-level">
                                <li><a href="">name</a></li>
                                <li><a href="">price</a></li>
                            </ul>
                        </li>

                        <li><a href="">one</a></li>
                        <li><a href="">two</a></li>
                        <li><a href="">three</a></li>
                    </ul>

                </div>
            </div>

<!------css----->

.sidebar .fa.arrow:before {
content: "\f105";
}
.sidebar .nav-second-level {
  display: none;
}
.sidebar .nav-fall .charj a:hover .nav-second-level {
  display: block;
}

Answer 1

Below 2 examples. The first one uses hover, the second one uses a click event.

 .sidebar .fa.arrow:before { content: "\\f105"; margin-left: 3px; } .nav-second-level { display: none; } .sidebar .nav-fall li:hover .nav-second-level { display: block; } 

 <div class="navbar-default navbar-right sidebar"> <div class="sidebar-nav navbar-collapse"> <ul class="nav-fall"> <li class="charj"><a href="">flower<i class="fa fa-angle-right arrow" aria-hidden="true"></i></a> <ul class="nav-second-level"> <li><a href="">name</a></li> <li><a href="">price</a></li> </ul> </li> <li><a href="">one</a></li> <li><a href="">two</a></li> <li><a href="">three</a></li> </ul> </div> </div> 

 $(document).on("click", ".charj", function() { $(this).find("ul").show(); }) 

 .sidebar .fa.arrow:before { content: "\\f105"; margin-left: 3px; } .nav-second-level { display: none; } 

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <div class="navbar-default navbar-right sidebar"> <div class="sidebar-nav navbar-collapse"> <ul class="nav-fall"> <li class="charj"><a href="#">flower<i class="fa fa-angle-right arrow" aria-hidden="true"></i></a> <ul class="nav-second-level"> <li><a href="">name</a></li> <li><a href="">price</a></li> </ul> </li> <li><a href="">one</a></li> <li><a href="">two</a></li> <li><a href="">three</a></li> </ul> </div> </div>