Question

我正在构建一个带有响应菜单的网站，该菜单当前具有4个菜单项，其中“关于”菜单项还有一个包含4个子菜单的子菜单。当我在手机上查看该菜单并单击“关于'子菜单显示，但是它将主菜单项向下推，无法访问它们，这意味着我无法向下滚动。

大多数代码来自一个Youtube视频，我的确对它有所了解，但是我添加了子菜单部分，但还没有弄清楚。感谢您的帮助。

HTML

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta http-equiv="X-UA-Compatible" content="ie=edge" />
    <title>navbar demo 4</title>
    <link rel="stylesheet" href="assets/css/main.css" />
</head>

<body>
    <header>
        <nav class="navbar">
            <div class="logo-brand">
                <div class="logo">
                    <img src="assets/img/physics.png" width="75" height="75" alt="physics" />
                </div>
                <div class="brand">
                    <a href="#">Science & Math with Dave</a>
                </div>
            </div>
            <ul>
                <li><a href="#">About</a>
                    <ul>
                        <li><a href="#">Bio</a></li>
                        <li><a href="#">Skills</a></li>
                        <li><a href="#">Education</a></li>
                        <li><a href="#">Resume</a></li>
                    </ul>
                </li>
                <li><a href="#">Blog</a></li>
                <li><a href="#">Projects</a></li>
                <li><a href="#">Contact</a></li>
            </ul>
            <button class="navbar-toggler">
                <span></span>
            </button>
        </nav>
    </header>

    <script type="text/javascript" src="assets/js/main.js"></script>
</body>

</html>

CSS

* {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
}

body {
  font-family: Calibri, Arial, sans-serif;
  background-color: rgb(235, 227, 227);
  color: #333;
}

header {
  width: 100%;
  height: 100vh;
  background: url(../img/TheRoad.jpg) no-repeat center center;
  background-color: black;
  background-size: cover;
  position: fixed;
  top: 0px;
  left: 0px;
}

.logo,
.brand {
  float: left;
  height: inherit;
  line-height: inherit;
  padding: 0 30px;
  font-size: 22px;
  font-weight: 400;
  letter-spacing: 4px;
}

.navbar {
  background-color: #ff5733;
  border-bottom: 1px solid rgba(255, 255, 255, 0.2);
  width: inherit;
  height: 80px;
  line-height: 80px;
  font-size: 18px;
  padding: 0 10px;
  position: fixed;
  top: 0;
  left: 0;
  opacity: 0.8;
}

.navbar a {
  text-decoration: none;
  color: cornsilk;
}

.navbar ul {
  float: right;
  list-style: none;
  height: inherit;
  line-height: inherit;
  padding: 0 5px;
}

.navbar ul li {
  display: inline-block;
}

.navbar ul li a {
  display: block;
  text-align: center;
  min-width: 30px;
  padding: 0 30px;
}

.navbar ul li a:hover {
  background-color: rgba(255, 255, 255, 0.15);
}

.navbar ul li ul li {
  display: none;
}

.navbar ul li:hover ul li {
  display: block;
  background-color: #ff5733;
}

.navbar .navbar-toggler {
  display: none;
}

@media (max-width: 768px) {
  /* Style for screens with 766 pixels or less - tablets and mobile devices */

  .navbar {
    padding: 0;
  }

  .logo {
    display: flex;
    justify-content: center;
    width: 100%;
  }

  .brand {
    background-color: #ff5733;
    display: flex;
    justify-content: center;
    font-size: 25px;
    font-weight: 400;
    letter-spacing: 2px;
    width: 100%;
  }

  .navbar ul {
    width: 100%;
    padding: 0;
    background-color: #4a7383;
    height: 100vh;
    max-height: 0;
    overflow: hidden;
    transition: all ease-in-out 0.5s;
  }

  .navbar ul.open {
    max-height: 100vh;
  }

  .navbar ul li {
    width: 100%;
  }

  .navbar ul li a {
    padding: 0;
  }

  .navbar ul li:hover ul li {
    background-color: #5b98b1;
  }

  .navbar ul li ul.open {
    display: block;
    height: 320px;
    max-height: 320px;
    transition: all ease-in-out 0.9s;
  }

  .navbar ul li ul li {
    display: block;
    background-color: #5b98b1;
  }

  .navbar .navbar-toggler {
    display: block;
    position: absolute;
    height: 40px;
    top: 20px;
    right: 20px;
    background-color: transparent;
    color: #fff;
    border: 3px solid #fff;
    border-radius: 10px;
    outline: none;
    padding: 0 5px;
    cursor: pointer;
  }

  .navbar .navbar-toggler span,
  .navbar .navbar-toggler span::before,
  .navbar .navbar-toggler span::after {
    display: block;
    content: '';
    background-color: #fff;
    height: 3px;
    width: 28px;
    border-radius: 5px;
    transition: all ease-in-out 0.8s;
  }

  .navbar .navbar-toggler span::before {
    transform: translateY(-8px);
  }

  .navbar .navbar-toggler span::after {
    transform: translateY(+5px);
  }

  .navbar .navbar-toggler.open-navbar-toggler span {
    /* transform: rotate(90deg); */
    background-color: transparent;
  }

  .navbar .navbar-toggler.open-navbar-toggler span::before {
    transform: translateY(0px) rotate(45deg);
  }

  .navbar .navbar-toggler.open-navbar-toggler span::after {
    transform: translateY(-3px) rotate(-45deg);
  }
}

JS

const navbarToggler = document.querySelector(".navbar-toggler");
const navbarMenu = document.querySelector(".navbar ul");
const navbarLinks = document.querySelectorAll(".navbar a");
const navbarSubMenu = document.querySelector(".navbar ul li ul")

navbarToggler.addEventListener("click", navbarTogglerClick);

function navbarTogglerClick(){
    navbarToggler.classList.toggle("open-navbar-toggler");

    if(navbarMenu.classList.contains("open")){
        navbarMenu.classList.remove("open");
        navbarSubMenu.classList.remove("open");
    }else{
        navbarMenu.classList.add("open");
    }
}

navbarLinks.forEach(elem => elem.addEventListener("click", navbarLinkClick));

function navbarLinkClick(e){
    if(navbarMenu.classList.contains("open")){
        if(e.target.text == "About"){
            navbarSubMenu.classList.toggle("open");
        }
        else{
            navbarToggler.click();
        }
    }
}

在移动设备上查看时，响应性导航栏的子菜单被部分隐藏

0 个答案: