Question

我使用bootswatch为css构建一个网站。几天前一切正常，然后我注意到我的菜单突然从导航栏中消失了。我已经检查了不同的来源和不同的明智问题，但他们与此无关。我在我的电脑上使用它。这是下面的代码。

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<!DOCTYPE html>
<html>
<head>
	<title>Mega Data Base</title>
  <link rel="stylesheet" href="https://bootswatch.com/4/cosmo/bootstrap.min.css">

</head>
<body>

    <nav class="navbar navbar-default">
      <div class="container">
				<div class="navbar-header">
          <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false">
	          <span class="sr-only">Toggle navigation</span>
	          <span class="icon-bar"></span>
	          <span class="icon-bar"></span>
	          <span class="icon-bar"></span>
					</button>
          <a class="navbar-brand" href="#">MegaDB</a>
        </div>


        <div class="navbar-collapse collapse" id="navbarSupportedContent">        
         <?php if(isset($_SESSION['is_logged_in'])) : ?>
        <ul class="nav navbar-nav">
          <li>
            <a href="<?php echo ROOT_URL; ?>">Home</a>
          </li>
          <li>
            <a href="<?php echo ROOT_URL; ?>lecturehalls/">Lecture Halls</a>
          </li>
          <li class="nav-item">
            <a href="<?php echo ROOT_URL; ?>teachers/">Teachers</a>
          </li>
        </ul>
        <?php else: ?>
          <ul class="nav navbar-nav">
          <li class="nav-item">
            <a class="nav-link" href="<?php echo ROOT_URL; ?>">Home</a>
          </li>
           </ul>
        <?php endif; ?>

        <ul class="nav navbar-nav navbar-right">
          <?php if(isset($_SESSION['is_logged_in'])) : ?>
          <li><a href="<?php echo ROOT_URL; ?>">Welcome <?php echo $_SESSION['user_data']['university_name']; ?></a></li>
          <li><a href="<?php echo ROOT_URL; ?>users/logout">Log Out</a></li>

          <?php else: ?>
          <li><a href="<?php echo ROOT_URL; ?>users/login">Login </a></li>
        <?php endif; ?>
        </ul>
      </div>
      </div>
    </nav>

    <div class="container">
        <?php Messages::display(); ?>
        <?php require($view);  ?>
    </div>



</body>
</html>

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请提供任何解决方案，了解我需要做些什么才能让它出现。提前致谢

Answer 1

您只需添加 jquery.min.js ＆amp;的 bootstrap.min.js

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<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet"/> <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script> <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script> <body> <nav class="navbar navbar-default"> <div class="container"> <div class="navbar-header"> <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false"> <span class="sr-only">Toggle navigation</span> <span class="icon-bar"></span> <span class="icon-bar"></span> <span class="icon-bar"></span> </button> <a class="navbar-brand" href="#">MegaDB</a> </div> <div class="navbar-collapse collapse" id="navbarSupportedContent"> <?php if(isset($_SESSION['is_logged_in'])) : ?> <ul class="nav navbar-nav"> <li> <a href="<?php echo ROOT_URL; ?>">Home</a> </li> <li> <a href="<?php echo ROOT_URL; ?>lecturehalls/">Lecture Halls</a> </li> <li class="nav-item"> <a href="<?php echo ROOT_URL; ?>teachers/">Teachers</a> </li> </ul> <?php else: ?> <ul class="nav navbar-nav"> <li class="nav-item"> <a class="nav-link" href="<?php echo ROOT_URL; ?>">Home</a> </li> </ul> <?php endif; ?> <ul class="nav navbar-nav navbar-right"> <?php if(isset($_SESSION['is_logged_in'])) : ?> <li><a href="<?php echo ROOT_URL; ?>">Welcome <?php echo $_SESSION['user_data']['university_name']; ?></a></li> <li><a href="<?php echo ROOT_URL; ?>users/logout">Log Out</a></li> <?php else: ?> <li><a href="<?php echo ROOT_URL; ?>users/login">Login </a></li> <?php endif; ?> </ul> </div> </div> </nav> <div class="container"> <?php Messages::display(); ?> <?php require($view); ?> </div> </body>
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Answer 2

将这些脚本添加到head.Because Bootstrap取决于Jquery和Bootstrap Js。你只是加载Bootstrep css

    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>

Bootstrap导航栏无效，菜单隐藏

2 个答案: