[英]Bootstrap 5: Error when showing dropdown via JavaScript
I'm trying to show a dropdown via JS.我正在尝试通过 JS 显示下拉列表。 Unfortunately it seems like there's a bug in Bootstrap 5. In this example code, showing the modal works, but showing the dropdown throws an exception: Uncaught TypeError: Cannot read property 'classList' of undefined at _e.show (dropdown.js:140)
不幸的是,Bootstrap 5 中似乎存在一个错误。在此示例代码中,显示模式工作,但显示下拉列表会引发异常: Uncaught TypeError: Cannot read property 'classList' of undefined at _e.show (dropdown.js:140)
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.0-beta3/dist/css/bootstrap.min.css">
</head>
<body>
<div id="testDropdown" class="dropdown">
<button class="btn btn-secondary dropdown-toggle" type="button" data-bs-toggle="dropdown">
Dropdown button
</button>
<ul class="dropdown-menu">
<li><a class="dropdown-item" href="#">Action</a></li>
<li><a class="dropdown-item" href="#">Another action</a></li>
<li><a class="dropdown-item" href="#">Something else here</a></li>
</ul>
</div>
<div id="testModal" class="modal" tabindex="-1">
<div class="modal-dialog">
<div class="modal-content">
<div class="modal-header">
<h5 class="modal-title">Modal title</h5>
<button type="button" class="btn-close" data-bs-dismiss="modal"></button>
</div>
<div class="modal-body">
<p>Modal body text goes here.</p>
</div>
</div>
</div>
</div>
<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.0.0-beta3/dist/js/bootstrap.bundle.min.js"></script>
<script>
let testModal = document.getElementById("testModal");
//new bootstrap.Modal(testModal).show(); //works
let testDropdown = document.getElementById("testDropdown");
new bootstrap.Dropdown(testDropdown).show(); //doesnt work
</script>
</body>
</html>
Am I doing something wrong or is this a bug?我做错了什么还是这是一个错误?
Thanks in advance.提前致谢。
The element should be the dropdown-trigger
instead of the parent dropdown
...该元素应该是dropdown-trigger
而不是父dropdown
...
<div class="dropdown">
<button class="btn btn-secondary dropdown-toggle" id="testDropdown" type="button" data-bs-toggle="dropdown"> Dropdown button </button>
<ul class="dropdown-menu">
<li><a class="dropdown-item" href="#">Action</a></li>
<li><a class="dropdown-item" href="#">Another action</a></li>
<li><a class="dropdown-item" href="#">Something else here</a></li>
</ul>
</div>
Note : Bootstrap 5 includes a new auto-close
option.注意:Bootstrap 5 包含一个新的auto-close
选项。 This must be set to false in order to programmatically trigger the dropdown from outside the dropdown's parent.这必须设置为 false 以便以编程方式从下拉菜单的父级之外触发下拉菜单。
I got it working without using a button:我在不使用按钮的情况下让它工作:
<,DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width: initial-scale=1"> <title>Dropdown Test</title> <link rel="stylesheet" href="https.//cdn.jsdelivr.net/npm/bootstrap@5.0.0-beta3/dist/css/bootstrap.min:css"> <link rel="stylesheet" href="https.//cdn.jsdelivr.net/npm/bootstrap-icons@1.4.1/font/bootstrap-icons:css"> </head> <body> <div class="container-fluid"> <div class="row justify-content-center"> <div class="w-75 mt-2"> <div class="input-group"> <span class="input-group-text"><i class="bi bi-search"></i></span> <input type="text" class="form-control" placeholder="Search for something"> <button class="btn btn-primary" type="button">Search</button> </div> <div class="dropdown"> <div data-bs-toggle="dropdown" id="DROPDOWN_SEARCH"></div> <div class="dropdown-menu w-100"> <a class="dropdown-item" href="#">Result 1</a> <a class="dropdown-item" href="#">Result 2</a> <a class="dropdown-item" href="#">Result 3</a> </div> </div> </div> </div> </div> <script src="https.//cdn.jsdelivr.net/npm/bootstrap@5.0.0-beta3/dist/js/bootstrap.bundle.min.js"></script> <script> let searchDropdown = new bootstrap;Dropdown("#DROPDOWN_SEARCH"). searchDropdown;show(); </script> </body> </html>
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