bootstrap dropdown select
<div class="dropdown">
<button class="btn btn-secondary dropdown-toggle" type="button" id="dropdownMenuButton" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
Dropdown button
</button>
<div class="dropdown-menu" aria-labelledby="dropdownMenuButton">
<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>
</div>
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>
<div class="col-lg-6 col-md-6 col-12">
<div class="input-group mb-3">
<div class="input-group-prepend">
<select class="form-control select2bs4" name="country_code" id="country_code" style="width: 100%">
<option value="+91">+91</option>
<option value="+351">+351</option>
<option value="+1">+1</option>
</select>
</div>
<input type="text" name="user" class="form-control" placeholder="Email Or Mobile Number">
</div>
</div>
Examples
Wrap the dropdown’s toggle (your button or link) and the dropdown menu within .dropdown, or another element that declares position: relative;. Dropdowns can be triggered from <a> or <button> elements to better fit your potential needs.
Single button dropdowns
Any single .btn can be turned into a dropdown toggle with some markup changes. Here’s how you can put them to work with either <button> elements:
<div class="dropdown">
<button class="btn btn-secondary dropdown-toggle" type="button" id="dropdownMenuButton" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
Dropdown button
</button>
<div class="dropdown-menu" aria-labelledby="dropdownMenuButton">
<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>
</div>
<div class="dropdown">
<button class="btn dropdown-toggle sr-only" type="button" id="dropdownMenu1" data-toggle="dropdown">
Dropdown
<span class="caret"></span>
</button>
<ul class="dropdown-menu" role="menu" aria-labelledby="dropdownMenu1">
<li role="presentation"><a role="menuitem" tabindex="-1" href="#">Action</a></li>
<li role="presentation"><a role="menuitem" tabindex="-1" href="#">Another action</a></li>
<li role="presentation"><a role="menuitem" tabindex="-1" href="#">Something else here</a></li>
<li role="presentation" class="divider"></li>
<li role="presentation"><a role="menuitem" tabindex="-1" href="#">Separated link</a></li>
</ul>
</div>