Свернутая Bootstrap панель навигации не открывается при нажатии

Question

То, что я пытаюсь сделать, это заставить сворачиваться панель навигации, когда она находится на меньшем экране, и расширять ее при нажатии кнопки. Но когда я нажимаю кнопку, ничего не происходит, и я понятия не имею, почему.

<nav class="navbar navbar-expand-lg navbar-light" style="background-color: #FFFFFF;">
  <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarToggleExternalContent" aria-controls="navbarToggleExternalContent" aria-expanded="false" aria-label="Toggle navigation">
    <span class="navbar-toggler-icon"></span>
  </button>
  <div class="collapse navbar-collapse justify-content-center" id="navbarNavDropdown">
    <a class="navbar-brand" href="index.html">
      <img src="images\logo1.png" width="200" height="80" class="d-inline-block align-top" alt="">
    </a>
    <ul class="navbar-nav">
      <li class="nav-item active">
        <a class="nav-link" href="index.html">Home <span class="sr-only">(current)</span></a>
      </li>
      <li class="navbar-nav dropdown">
        <a class="nav-link dropdown-toggle" type="button" id="dropdownMenuButton" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
          Behandelingen
        </a>
        <div class="dropdown-menu" aria-labelledby="navbarDropdownMenuLink">
          <a class="dropdown-item" href="sportmassage.html">Sportmassage</a>
          <a class="dropdown-item" href="massagetherapie.html">Massagetherapie</a>
          <a class="dropdown-item" href="ontspanningsmassage.html">Ontspanningsmassage</a>
        </div>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="tarieven.html">Tarieven</a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="contact.html">Contact</a>
      </li>
    </ul>
  </div>
</nav>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">
<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js" integrity="sha384-UO2eT0CpHqdSJQ6hJty5KVphtPhzWj9WO1clHTMGa3JDZwrnQq4sF86dIHNDz0W1" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" integrity="sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM" crossorigin="anonymous"></script>

Answer 1

data-target="#navbarToggleExternalContent" на вашей кнопке переключения неправильный. Он должен совпадать с идентификатором .navbar-collapse.

Подробнее о коллапсе Bootstrap 4 через атрибут data- здесь

Answer 2

Ваша проблема:

Атрибут data-target для <button class="navbar-toggler"> и id для <div class="navbar-collapse"> должны совпадать, чтобы эта функция работала (data-target, начинающийся с хэштега обратитесь к идентификатору).

---

Образец:

<button class="navbar-toggler" data-target="#collapseElement" aria-controls="collapseElement"></button>
<div class="collapse navbar-collapse" id="collapseElement">

---

Это минимальный рабочий пример, который выделяет только элементы, связанные с topi c :

<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">

<nav class="navbar navbar-expand-lg navbar-light">
  <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNavDropdown" aria-controls="navbarNavDropdown">
    <span class="navbar-toggler-icon"></span>
  </button>
  <div class="collapse navbar-collapse" id="navbarNavDropdown">
    Nagivation Elements Here
  </div>
</nav>

<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js" integrity="sha384-UO2eT0CpHqdSJQ6hJty5KVphtPhzWj9WO1clHTMGa3JDZwrnQq4sF86dIHNDz0W1" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" integrity="sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM" crossorigin="anonymous"></script>

---

Атрибут aria-controls также должен совпадать, хотя эта конкретная функция работает без него.

Здесь полный рабочий код:

<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">

<nav class="navbar navbar-expand-lg navbar-light" style="background-color: #FFFFFF;">

  <!-- This button is the navbar-toggler. This data-target refers to the id of the .navbar-collapse element -->
  <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNavDropdown" aria-controls="navbarNavDropdown" aria-expanded="false" aria-label="Toggle navigation">
    <span class="navbar-toggler-icon"></span>
  </button>
  
  <!-- This div is the collapsable element -->
  <div class="collapse navbar-collapse justify-content-center" id="navbarNavDropdown">
    <a class="navbar-brand" href="index.html">
      <img src="images\logo1.png" width="200" height="80" class="d-inline-block align-top" alt="">
    </a>
    <ul class="navbar-nav">
      <li class="nav-item active">
        <a class="nav-link" href="index.html">Home <span class="sr-only">(current)</span></a>
      </li>
      <li class="navbar-nav dropdown">
        <a class="nav-link dropdown-toggle" type="button" id="dropdownMenuButton" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
          Behandelingen
        </a>
        <div class="dropdown-menu" aria-labelledby="navbarDropdownMenuLink">
          <a class="dropdown-item" href="sportmassage.html">Sportmassage</a>
          <a class="dropdown-item" href="massagetherapie.html">Massagetherapie</a>
          <a class="dropdown-item" href="ontspanningsmassage.html">Ontspanningsmassage</a>
        </div>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="tarieven.html">Tarieven</a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="contact.html">Contact</a>
      </li>
    </ul>
  </div>
</nav>

<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js" integrity="sha384-UO2eT0CpHqdSJQ6hJty5KVphtPhzWj9WO1clHTMGa3JDZwrnQq4sF86dIHNDz0W1" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" integrity="sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM" crossorigin="anonymous"></script>

На практике обязательно всегда добавляйте свои ссылки на таблицы стилей вверху страницы.

Answer 3

пожалуйста, убедитесь, что ваш идентификатор

data-target = "# navbarToggleExternalContent"

и

id = "navbarToggleExternalContent">

должен быть таким же

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
  
</head>
<body>
<nav class="navbar navbar-expand-lg navbar-light" style="background-color: #FFFFFF;">
  <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarToggleExternalContent" aria-controls="navbarToggleExternalContent" aria-expanded="false" aria-label="Toggle navigation">
    <span class="navbar-toggler-icon"></span>
  </button>
  <div class="collapse navbar-collapse justify-content-center" id="navbarToggleExternalContent">
    <a class="navbar-brand" href="index.html">
      <img src="images\logo1.png" width="200" height="80" class="d-inline-block align-top" alt="">
    </a>
    <ul class="navbar-nav">
      <li class="nav-item active">
        <a class="nav-link" href="index.html">Home <span class="sr-only">(current)</span></a>
      </li>
      <li class="navbar-nav dropdown">
        <a class="nav-link dropdown-toggle" type="button" id="dropdownMenuButton" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
          Behandelingen
        </a>
        <div class="dropdown-menu" aria-labelledby="navbarDropdownMenuLink">
          <a class="dropdown-item" href="sportmassage.html">Sportmassage</a>
          <a class="dropdown-item" href="massagetherapie.html">Massagetherapie</a>
          <a class="dropdown-item" href="ontspanningsmassage.html">Ontspanningsmassage</a>
        </div>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="tarieven.html">Tarieven</a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="contact.html">Contact</a>
      </li>
    </ul>
  </div>
</nav>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">
<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js" integrity="sha384-UO2eT0CpHqdSJQ6hJty5KVphtPhzWj9WO1clHTMGa3JDZwrnQq4sF86dIHNDz0W1" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" integrity="sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM" crossorigin="anonymous"></script>
</body>
</html>

Answer 4

Переключить data-target="#navbarNavDropdown" изменилось, затем работа. Надеюсь, это поможет вам.

<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">
<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js" integrity="sha384-UO2eT0CpHqdSJQ6hJty5KVphtPhzWj9WO1clHTMGa3JDZwrnQq4sF86dIHNDz0W1" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" integrity="sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM" crossorigin="anonymous"></script>
<nav class="navbar navbar-expand-lg navbar-light" style="background-color: #FFFFFF;">
  <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNavDropdown" aria-controls="navbarToggleExternalContent" aria-expanded="false" aria-label="Toggle navigation">
    <span class="navbar-toggler-icon"></span>
  </button>
  <div class="collapse navbar-collapse justify-content-center" id="navbarNavDropdown">
    <a class="navbar-brand" href="index.html">
      <img src="images\logo1.png" width="200" height="80" class="d-inline-block align-top" alt="">
    </a>
    <ul class="navbar-nav">
      <li class="nav-item active">
        <a class="nav-link" href="index.html">Home <span class="sr-only">(current)</span></a>
      </li>
      <li class="navbar-nav dropdown">
        <a class="nav-link dropdown-toggle" type="button" id="dropdownMenuButton" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
          Behandelingen
        </a>
        <div class="dropdown-menu" aria-labelledby="navbarDropdownMenuLink">
          <a class="dropdown-item" href="sportmassage.html">Sportmassage</a>
          <a class="dropdown-item" href="massagetherapie.html">Massagetherapie</a>
          <a class="dropdown-item" href="ontspanningsmassage.html">Ontspanningsmassage</a>
        </div>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="tarieven.html">Tarieven</a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="contact.html">Contact</a>
      </li>
    </ul>
  </div>
</nav>