how to use bootstrap dropdown code example

Example 1: create a dropdown in html bootstrap

<div class="dropdown">
  <button class="btn btn-secondary dropdown-toggle" type="button" id="dropdownMenu2" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
    Dropdown
  </button>
  <div class="dropdown-menu" aria-labelledby="dropdownMenu2">
    <button class="dropdown-item" type="button">Action</button>
    <button class="dropdown-item" type="button">Another action</button>
    <button class="dropdown-item" type="button">Something else here</button>
  </div>
</div>

Example 2: dropdown forms in bootstrap

<li class="dropdown">
         <a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown            

         <b class="caret"></b></a>
         <ul class="dropdown-menu">
           <li><a href="#"><form role="form">
<div class="form-group">
  <label for="sel1">Select list (select one):</label>
  <select class="form-control" id="sel1">
    <option>1</option>
    <option>2</option>
    <option>3</option>
    <option>4</option>
  </select>
  <br>
  <label for="sel2">Mutiple select list (hold shift to select more than one):</label>
  <select multiple class="form-control" id="sel2">
    <option>1</option>
    <option>2</option>
    <option>3</option>
    <option>4</option>
    <option>5</option>
  </select>
</div>

Example 3: dropdown bootstrap

Bootstrap Dropdown menu with seach button<div class="collapse navbar-collapse justify-content-between" id="navbarCollapse">
            <div class="navbar-nav">
                <div class="nav-item dropdown">
                    <a href="#" class="nav-link dropdown-toggle" data-toggle="dropdown">MANAGEMENT</a>
                    <div class="dropdown-menu">
                        <a href="#" class="dropdown-item">Man</a>
                        <a href="#" class="dropdown-item">Man</a>
                        <a href="#" class="dropdown-item">Man</a>
                    </div>
                </div>
            </div>
            
            <div class="collapse navbar-collapse justify-content-between" id="navbarCollapse">
            <div class="navbar-nav">
                <div class="nav-item dropdown">
                    <a href="#" class="nav-link dropdown-toggle" data-toggle="dropdown">PROJECT</a>
                    <div class="dropdown-menu">
                        <a href="#" class="dropdown-item">Pro</a>
                        <a href="#" class="dropdown-item">Pro</a>
                        <a href="#" class="dropdown-item">Pro</a>
                    </div>
                </div>
            </div>

            <div class="navbar-nav">
                <a href="#" class="nav-item nav-link">LOGIN/REGISTER</a>
            </div>
        </div>
    </nav>
</div>

Example 4: on click drop down bootstrao

<p>
  <a class="btn btn-primary" data-toggle="collapse" href="#collapseExample" role="button" aria-expanded="false" aria-controls="collapseExample">
    Link with href
  </a>
  <button class="btn btn-primary" type="button" data-toggle="collapse" data-target="#collapseExample" aria-expanded="false" aria-controls="collapseExample">
    Button with data-target
  </button>
</p>
<div class="collapse" id="collapseExample">
  <div class="card card-body">
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  </div>
</div>