Why is my Bootstrap 4 Dropdown Menu Not Working?-CSS Tutorial-php.cn

Why is my Bootstrap 4 Dropdown Menu Not Working?

Barbara Streisand

Release： 2024-11-18 01:10:01

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Why is my Bootstrap 4 Dropdown Menu Not Working?

Why is my Bootstrap 4 Dropdown Menu Not Working?

Problem:

You've implemented the official Bootstrap 4 example for dropdown menus, but they're not displaying when clicked.

Potential Solutions:

Ensure the following:

Include Required Files:
- Check that you've included jQuery, Popper.js, and Bootstrap.js in the correct order.
Check Console for Errors:
- Inspect the browser console for any errors or warnings.
Confirm Element IDs:
- Make sure the id attributes of the dropdown toggle (dropdown01) and the dropdown menu (aria-labelledby="dropdown01") match.

Specific Issues Resolution:

Missing Popper.js: It has been reported that the absence of Popper.js can cause this issue. Ensure that Popper.js is included and working properly.
Outdated Bootstrap Version: Verify that you're using the latest version of Bootstrap 4. Older versions may exhibit this behavior.

Working Example:

Below is a fully functional example of a Bootstrap 4 dropdown menu:

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">

  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta/css/bootstrap.min.css" integrity="sha384-/Y6pD6FV/Vv2HJnA6t+vslU6fwYXjCFtcEpHbNJ0lyAFsXTsjBbfaDjzALeQsN6M" crossorigin="anonymous">
</head>
<body>
  <nav class="navbar navbar-expand-lg navbar-light bg-light">
    <a class="navbar-brand" href="#">Navbar</a>
      <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>
    <div class="collapse navbar-collapse">

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