Я пытаюсь поймать события из выпадающего меню начальной загрузки. Кажется, ничего не работает, хотя, очевидно, я делаю что-то не так.
Код, урезанный до проблемы ...
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1, minimum-scale=1">
<title>Demo</title>
<link href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.4.0/jquery.js" integrity="sha256-DYZMCC8HTC+QDr5QNaIcfR7VSPtcISykd+6eSmBW5qo=" crossorigin="anonymous"></script>
</head>
<body>
<div class="navbar">
<a class="nav-link dropdown-toggle" href="#" id="search_drop" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
Search
</a>
<div class="dropdown-menu" aria-labelledby="search_drop">
<h2 class="text-primary">Search</h2>
<form class="navbar-form navbar-right navbar-expand-xl" id="header-searchForm">
<input type="text" class="form-control" placeholder="enter terms" name="Search" aria aria-selected="true" id="search_str" required="true">
<button type="submit" class="btn btn-sm btn-primary">
Search
</button>
</form>
</div>
</div>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.bundle.min.js" integrity="sha384-xrRywqdh3PHs8keKZN+8zzc5TX0GRTLCcmivcbNJWm2rs5C8PRhcEn3czEjhAO9o" crossorigin="anonymous"></script>
<script type="text/javascript">
$('#search_drop').on('show.bs.dropdown', function() {
console.log("show");
}).on('shown.bs.dropdown', function() {
console.log("shown");
}).on('hide.bs.dropdown', function() {
console.log("hide");
}).on('hidden.bs.dropdown', function() {
console.log("hidden");
});
</script>
</body>
</html>
Ни одно из console.log утверждений не попало.