Bootstrap5 Navbar多级下拉框

人海中的海盗2024-07-26 10:31

实现目标：

1、访问Bootstrap5-navbar

2、修改dropdown为多级

复制代码 
<!DOCTYPE HTML>
<html lang="en-US">
<head>
	<meta charset="UTF-8">
	<title></title>
	  <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css">
	  <script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/js/bootstrap.min.js"></script>
	 
</head>
<body>
	
	<nav class="navbar navbar-expand-lg navbar-light bg-light">
  <div class="container-fluid">
    <a class="navbar-brand" href="#">Navbar</a>
    <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
      <span class="navbar-toggler-icon"></span>
    </button>
    <div class="collapse navbar-collapse" id="navbarSupportedContent">
      <ul class="navbar-nav me-auto mb-2 mb-lg-0">
        <li class="nav-item">
          <a class="nav-link active" aria-current="page" href="#">Home</a>
        </li>
        <li class="nav-item">
          <a class="nav-link" href="#">Link</a>
        </li>
       

	   <li class="nav-item dropdown">
          <a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-bs-toggle="dropdown" aria-expanded="false">
            Dropdown
          </a>
          <ul class="dropdown-menu" aria-labelledby="navbarDropdown">
            <li><a class="dropdown-item" href="#">Action</a></li>
            <li><a class="dropdown-item" href="#">Another action</a></li>
            <li><hr class="dropdown-divider"></li>
            <li><a class="dropdown-item" href="#">Something else here</a></li>
			
					  <li class="nav-item dropdown drop-down02">
						  <a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-bs-toggle="dropdown" aria-expanded="false">
							Dropdown
						  </a>
						  <ul class="dropdown-menu sub-menu02" aria-labelledby="navbarDropdown">
							<li><a class="dropdown-item" href="#">Action</a></li>
							<li><a class="dropdown-item" href="#">Another action</a></li>
							<li><hr class="dropdown-divider"></li>
							<li><a class="dropdown-item" href="#">Something else here</a></li>
							
									 <li class="nav-item dropdown drop-down02">
										  <a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-bs-toggle="dropdown" aria-expanded="false">
											Dropdown
										  </a>
										  <ul class="dropdown-menu sub-menu02" aria-labelledby="navbarDropdown">
											<li><a class="dropdown-item" href="#">Action</a></li>
											<li><a class="dropdown-item" href="#">Another action</a></li>
											<li><hr class="dropdown-divider"></li>
											<li><a class="dropdown-item" href="#">Something else here</a></li>
											
													 <li class="nav-item dropdown drop-down02">
														  <a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-bs-toggle="dropdown" aria-expanded="false">
															Dropdown
														  </a>
														  <ul class="dropdown-menu sub-menu02" aria-labelledby="navbarDropdown">
															<li><a class="dropdown-item" href="#">Action</a></li>
															<li><a class="dropdown-item" href="#">Another action</a></li>
															<li><hr class="dropdown-divider"></li>
															<li><a class="dropdown-item" href="#">Something else here</a></li>
														  </ul>
														</li>
										  </ul>
										</li>
						  </ul>
						</li>
          </ul>
        </li>
		
		
		
        <li class="nav-item">
          <a class="nav-link disabled" href="#" tabindex="-1" aria-disabled="true">Disabled</a>
        </li>
      </ul>
      <form class="d-flex">
        <input class="form-control me-2" type="search" placeholder="Search" aria-label="Search">
        <button class="btn btn-outline-success" type="submit">Search</button>
      </form>
    </div>
  </div>
</nav>

 
</body>
</html>

3、完成之后访问

这时如果你点击第二个dropdown，它是不会展开内容的，因为我们自定义了多级dropdown，而bootstrap5只定义了单个dropdown点击事件 ，此时就要解决问题。继续。。。

4、处理多级dropdown点击事件

这里我提供一个js脚本文件，引入脚本文件就能实现。

bootstrap5-dropdown.js

复制代码 
(function($bs) {
		const CLASS_NAME = 'has-child-dropdown-show';
			$bs.Dropdown.prototype.toggle = function(_orginal) {
				return function() {
					document.querySelectorAll('.' + CLASS_NAME).forEach(function(e) {
						e.classList.remove(CLASS_NAME);
					});
					let dd = this._element.closest('.dropdown').parentNode.closest('.dropdown');
					for (; dd && dd !== document; dd = dd.parentNode.closest('.dropdown')) {
						dd.classList.add(CLASS_NAME);
					}
					return _orginal.call(this);
				}
			}($bs.Dropdown.prototype.toggle);

			document.querySelectorAll('.dropdown').forEach(function(dd) {
				dd.addEventListener('hide.bs.dropdown', function(e) {
					if (this.classList.contains(CLASS_NAME)) {
						this.classList.remove(CLASS_NAME);
						e.preventDefault();
					}
					if(e.clickEvent && e.clickEvent.composedPath().some(el=>el.classList && el.classList.contains('dropdown-toggle'))){
						e.preventDefault();
					}
					e.stopPropagation(); // do not need pop in multi level mode
				});
			});

			// for hover
			function getDropdown(element) {
				return $bs.Dropdown.getInstance(element) || new $bs.Dropdown(element);
			}

			document.querySelectorAll('.dropdown-hover, .dropdown-hover-all .dropdown').forEach(function(dd) {
				dd.addEventListener('mouseenter', function(e) {
					let toggle = e.target.querySelector(':scope>[data-bs-toggle="dropdown"]');
					if (!toggle.classList.contains('show')) {
						getDropdown(toggle).toggle();
					}
				});
				dd.addEventListener('mouseleave', function(e) {
					let toggle = e.target.querySelector(':scope>[data-bs-toggle="dropdown"]');
					if (toggle.classList.contains('show')) {
						getDropdown(toggle).toggle();
					}
				});
			});
		})(bootstrap);

5、访问看看

看看显示有点丑，美化一下

6、美化dropdown

自定义样式

分别找到dropdown修改关键内容：

复制代码 
  <li class="nav-item dropdown drop-down02">
						 
 <ul class="dropdown-menu sub-menu02" aria-labelledby="navbarDropdown">

自定义样式文件：style.css

复制代码 
.drop-down02{
	position:relative;
}
.drop-down02 .sub-menu02
{
	position: absolute !important;
	left: 100%;
	top: 0;
}

.drop-down02 .dropdown-toggle{
	padding:.25rem 1.1rem !important;
}

@media screen and (max-width :767px)
{
	.drop-down02 .sub-menu02
	{
		position:static !important;
	}
}

7、完整代码

index.html

复制代码 
<!DOCTYPE HTML>
<html lang="en-US">
<head>
	<meta charset="UTF-8">
	<title></title>
	  <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css">
	  <script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/js/bootstrap.min.js"></script>
	  <link rel="stylesheet" href="/static/css/style.css" /> 
</head>
<body>
	
	<nav class="navbar navbar-expand-lg navbar-light bg-light">
  <div class="container-fluid">
    <a class="navbar-brand" href="#">Navbar</a>
    <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
      <span class="navbar-toggler-icon"></span>
    </button>
    <div class="collapse navbar-collapse" id="navbarSupportedContent">
      <ul class="navbar-nav me-auto mb-2 mb-lg-0">
        <li class="nav-item">
          <a class="nav-link active" aria-current="page" href="#">Home</a>
        </li>
        <li class="nav-item">
          <a class="nav-link" href="#">Link</a>
        </li>
       

	   <li class="nav-item dropdown">
          <a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-bs-toggle="dropdown" aria-expanded="false">
            Dropdown
          </a>
          <ul class="dropdown-menu" aria-labelledby="navbarDropdown">
            <li><a class="dropdown-item" href="#">Action</a></li>
            <li><a class="dropdown-item" href="#">Another action</a></li>
            <li><hr class="dropdown-divider"></li>
            <li><a class="dropdown-item" href="#">Something else here</a></li>
			
					  <li class="nav-item dropdown drop-down02">
						  <a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-bs-toggle="dropdown" aria-expanded="false">
							Dropdown
						  </a>
						  <ul class="dropdown-menu sub-menu02" aria-labelledby="navbarDropdown">
							<li><a class="dropdown-item" href="#">Action</a></li>
							<li><a class="dropdown-item" href="#">Another action</a></li>
							<li><hr class="dropdown-divider"></li>
							<li><a class="dropdown-item" href="#">Something else here</a></li>
							
									 <li class="nav-item dropdown drop-down02">
										  <a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-bs-toggle="dropdown" aria-expanded="false">
											Dropdown
										  </a>
										  <ul class="dropdown-menu sub-menu02" aria-labelledby="navbarDropdown">
											<li><a class="dropdown-item" href="#">Action</a></li>
											<li><a class="dropdown-item" href="#">Another action</a></li>
											<li><hr class="dropdown-divider"></li>
											<li><a class="dropdown-item" href="#">Something else here</a></li>
											
													 <li class="nav-item dropdown drop-down02">
														  <a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-bs-toggle="dropdown" aria-expanded="false">
															Dropdown
														  </a>
														  <ul class="dropdown-menu sub-menu02" aria-labelledby="navbarDropdown">
															<li><a class="dropdown-item" href="#">Action</a></li>
															<li><a class="dropdown-item" href="#">Another action</a></li>
															<li><hr class="dropdown-divider"></li>
															<li><a class="dropdown-item" href="#">Something else here</a></li>
														  </ul>
														</li>
										  </ul>
										</li>
						  </ul>
						</li>
          </ul>
        </li>
		
		
		
        <li class="nav-item">
          <a class="nav-link disabled" href="#" tabindex="-1" aria-disabled="true">Disabled</a>
        </li>
      </ul>
      <form class="d-flex">
        <input class="form-control me-2" type="search" placeholder="Search" aria-label="Search">
        <button class="btn btn-outline-success" type="submit">Search</button>
      </form>
    </div>
  </div>
</nav>

<!-- 这里 引入 bootstrap5-dropdown.js  -->
<script src="/static/js/bootstrap5-dropdown.js"></script> 
</body>
</html>

style.css

复制代码 
.drop-down02{
	position:relative;
}
.drop-down02 .sub-menu02
{
	position: absolute !important;
	left: 100%;
	top: 0;
}

.drop-down02 .dropdown-toggle{
	padding:.25rem 1.1rem !important;
}

@media screen and (max-width :767px)
{
	.drop-down02 .sub-menu02
	{
		position:static !important;
	}
}

bootstrap5-dropdown.js

复制代码 
(function($bs) {
		const CLASS_NAME = 'has-child-dropdown-show';
			$bs.Dropdown.prototype.toggle = function(_orginal) {
				return function() {
					document.querySelectorAll('.' + CLASS_NAME).forEach(function(e) {
						e.classList.remove(CLASS_NAME);
					});
					let dd = this._element.closest('.dropdown').parentNode.closest('.dropdown');
					for (; dd && dd !== document; dd = dd.parentNode.closest('.dropdown')) {
						dd.classList.add(CLASS_NAME);
					}
					return _orginal.call(this);
				}
			}($bs.Dropdown.prototype.toggle);

			document.querySelectorAll('.dropdown').forEach(function(dd) {
				dd.addEventListener('hide.bs.dropdown', function(e) {
					if (this.classList.contains(CLASS_NAME)) {
						this.classList.remove(CLASS_NAME);
						e.preventDefault();
					}
					if(e.clickEvent && e.clickEvent.composedPath().some(el=>el.classList && el.classList.contains('dropdown-toggle'))){
						e.preventDefault();
					}
					e.stopPropagation(); // do not need pop in multi level mode
				});
			});

			// for hover
			function getDropdown(element) {
				return $bs.Dropdown.getInstance(element) || new $bs.Dropdown(element);
			}

			document.querySelectorAll('.dropdown-hover, .dropdown-hover-all .dropdown').forEach(function(dd) {
				dd.addEventListener('mouseenter', function(e) {
					let toggle = e.target.querySelector(':scope>[data-bs-toggle="dropdown"]');
					if (!toggle.classList.contains('show')) {
						getDropdown(toggle).toggle();
					}
				});
				dd.addEventListener('mouseleave', function(e) {
					let toggle = e.target.querySelector(':scope>[data-bs-toggle="dropdown"]');
					if (toggle.classList.contains('show')) {
						getDropdown(toggle).toggle();
					}
				});
			});
		})(bootstrap);

8、最终访问页面

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