What could be the reason that my Bootstrap dropdown menu is not appearing on my website

I am currently utilizing Angular in my project. I have incorporated bootstrap and jQuery via NPM install, and specified them as dependencies in angular.json.

The navbar on my site contains a dropdown menu. When I hover over the dropdown menu, it should display two dropdown items. However, for some reason they are not appearing. I'm having trouble pinpointing the issue...

/* The dropdown container */

.dropdown {
  float: left;
  overflow: hidden;
}


/* Dropdown button */

.dropdown-toggle {
  font-size: 16px;
  border: none;
  outline: none;
  color: white;
  padding: 14px 16px;
  background-color: inherit;
  font-family: inherit;
  /* Important for vertical align on mobile phones */
  margin: 0;
  /* Important for vertical align on mobile phones */
}


/* Dropdown content (hidden by default) */

.navbar .dropdown-content {
  display: none;
  position: absolute;
  background-color: #f9f9f9;
  min-width: 160px;
  box-shadow: 0px 8px 16px 0px rgba(0, 0, 0, 0.2);
  z-index: 1;
}


/* Links inside the dropdown */

.navbar .dropdown-content a {
  float: none;
  color: black;
  padding: 12px 16px;
  text-decoration: none;
  display: block;
  text-align: left;
}


/* Show the dropdown menu on hover */

.navbar .nav-item:hover .dropdown-menu {
  display: block;
}
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="eb8984849f989f998a9babdec5dac5d8">[email protected]</a>/dist/css/bootstrap.min.css" integrity="sha384-1BmE4kWBq78iYhFldvKuhfTAU6auU8tT94WrHftjDbrCEXSU1oBoqyl2QvZ6jIW3" crossorigin="anonymous">

<!-- Navbar -->
<nav class="navbar navbar-expand-sm bg-dark navbar-dark">
  <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#collapsibleNavbar">
    <span class="navbar-toggler-icon"></span>
  </button>
  <div class="collapse navbar-collapse" id="collapsibleNavbar">
    <ul class="nav navbar-nav">
      <li class="nav-item">
        <a class="nav-link" href="#">Home</a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="#">My Events</a>
      </li>
      <li class="nav-item dropdown">
        <a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
          Registrations
        </a>
        <div class="dropdown-menu" aria-labelledby="navbarDropdown">
          <a class="dropdown-item" href="#">Active</a>
          <div class="dropdown-divider"></div>
          <a class="dropdown-item" href="#">History</a>
        </div>
      </li>
      <li class="nav-item">
        <a class="nav-link disabled" href="#">Disabled</a>
      </li>
    </ul>
    <form class="form-inline my-2 my-lg-0">
      <input class="form-control mr-sm-2" type="search" placeholder="Search" aria-label="Search">
      <button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
    </form>
  </div>
</nav>

<script src="https://cdn.jsdelivr.net/npm/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="20424f4f54535452415060150e110e13">[email protected]</a>/dist/js/bootstrap.bundle.min.js" integrity="sha384-ka7Sk0Gln4gmtz2MlQnikT1wXgYsOg+OMhuP+IlRH9sENBO0LRn5q+8nbTov4+1p" crossorigin="anonymous"></script>

Answer №1

When it comes to your bootstrap syntax, there seems to be an issue with data-target not being correct due to attributes with data-bs-* for B5 as compared to B4's data-*. Simply replacing data-target with data-bs-target should solve the problem. Check out this JSFiddle link

Answer №2

It is recommended to eliminate the constraints imposed on the .dropdown element. The purpose of these rules is unclear, and it's advisable not to override essential library features. If specific alignment is needed, Bootstrap provides ample customization options.

/* The dropdown container */
.dropdown {
  /* float: left;
  overflow: hidden; */
}

/* Dropdown button */
.dropdown-toggle {
  font-size: 16px;
  border: none;
  outline: none;
  color: white;
  padding: 14px 16px;
  background-color: inherit;
  font-family: inherit;
  /* Important for vertical align on mobile phones */
  margin: 0;
  /* Important for vertical align on mobile phones */
}

/* Dropdown content (hidden by default) */
.navbar .dropdown-content {
  display: none;
  position: absolute;
  background-color: #f9f9f9;
  min-width: 160px;
  box-shadow: 0px 8px 16px 0px rgba(0, 0, 0, 0.2);
  z-index: 1;
}

/* Links inside the dropdown */
.navbar .dropdown-content a {
  float: none;
  color: black;
  padding: 12px 16px;
  text-decoration: none;
  display: block;
  text-align: left;
}


/* Show the dropdown menu on hover */
.navbar .nav-item:hover .dropdown-menu {
  display: block;
}
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="9cfef3f3e8efe8eefdecdca9b2adb2af">[email protected]</a>/dist/css/bootstrap.min.css" integrity="sha384-1BmE4kWBq78iYhFldvKuhfTAU6auU8tT94WrHftjDbrCEXSU1oBoqyl2QvZ6jIW3" crossorigin="anonymous">

<!-- Navbar -->
<nav class="navbar navbar-expand-sm bg-dark navbar-dark">
  <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#collapsibleNavbar">
    <span class="navbar-toggler-icon"></span>
  </button>
  <div class="collapse navbar-collapse" id="collapsibleNavbar">
    <ul class="nav navbar-nav">
      <li class="nav-item">
        <a class="nav-link" href="#">Home</a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="#">My Events</a>
      </li>
      <li class="nav-item dropdown">
        <a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
          Registrations
        </a>
        <div class="dropdown-menu" aria-labelledby="navbarDropdown">
          <a class="dropdown-item" href="#">Active</a>
          <div class="dropdown-divider"></div>
          <a class="dropdown-item" href="#">History</a>
        </div>
      </li>
      <li class="nav-item">
        <a class="nav-link disabled" href="#">Disabled</a>
      </li>
    </ul>
    <form class="form-inline my-2 my-lg-0">
      <input class="form-control mr-sm-2" type="search" placeholder="Search" aria-label="Search">
      <button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
    </form>
  </div>
</nav>

<script src="https://cdn.jsdelivr.net/npm/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="ceaca1a1babdbabcafbe8efbe0ffe0fd">[email protected]</a>/dist/js/bootstrap.bundle.min.js" integrity="sha384-ka7Sk0Gln4gmtz2MlQnikT1wXgYsOg+OMhuP+IlRH9sENBO0LRn5q+8nbTov4+1p" crossorigin="anonymous"></script>

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