Changing the width of a dropdown menu to match the width of its parent in Bootstrap 4

I am currently working on a dropdown feature using Bootstrap 4. To achieve the desired layout, I have placed the dropdown-toggle button and dropdown-menu within a div element with the class "container". My goal is for both the dropdown toggle and dropdown menu to span the full width of their parent element. Here's the code snippet I have written so far:

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css">

<body>
  <div class="container">
    <button class="dropdown-toggle btn-block" data-toggle="dropdown">
      Dropdown
    </button>
    <div class="dropdown-menu">
      <a href="" class="dropdown-item">One</a>
      <a href="" class="dropdown-item">Two</a>
      <a href="" class="dropdown-item">Three</a>
      <a href="" class="dropdown-item">Four</a>
    </div>
</div>
    <script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script>
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script>

</body>

While the dropdown-toggle button successfully stretches to the full width of its parent div, I encountered an issue when clicking on it - the dropdown-menu does not expand to match the parent's width. I aim for the dropdown-menu to have the same width as its parent container. I have attempted using the width:inherit; property, but it did not produce the desired outcome.

htmlcssbootstrap-4

Answer №1

To achieve a full-width dropdown menu in Bootstrap 4, you can simply utilize the display="static" dropdown option, along with the w-100 and position-static classes within the dropdown structure.

<div class="container">
    <button class="dropdown-toggle btn-block" data-toggle="dropdown" data-display="static">
        Dropdown
    </button>
    <div class="dropdown-menu position-static w-100">
        <a href="" class="dropdown-item">One</a>
        <a href="" class="dropdown-item">Two</a>
        <a href="" class="dropdown-item">Three</a>
        <a href="" class="dropdown-item">Four</a>
    </div>
</div>

Visit this link for a live example.

Additionally, check out this thread on Stack Overflow: How to make a Bootstrap 4 full width dropdown in Navbar?

Answer №2

When the dropdown-menu has the property position:absolute, setting width:100%; will cause it to expand to the full width of the page instead of the container. To ensure that the dropdown-menu stretches to the width of its parent element, the parent element needs a relative positioning. To resolve this issue, start by adding the attribute class="position-relative" to the parent element of the dropdown-menu. Then, include w-100 in the class attribute of the dropdown-menu div.

<div class="container position-relative">
<button class="dropdown-toggle btn-block" data-toggle="dropdown">
  dropdown
</button>
<div class="dropdown-menu w-100">
  <a href="" class="dropdown-item">one</a>
  <a href="" class="dropdown-item">two</a>
  <a href="" class="dropdown-item">three</a>
  <a href="" class="dropdown-item">four</a>
</div>

Answer №3

To ensure the dropdown menu expands to the full width, simply include min-width: 100% in the styling for the dropdown-menu class.

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