有谁知道我如何在单击按钮时保持下拉菜单打开？

问题描述 投票：0回答：1

我正在学习 JS，所以我对它很陌生并且自学。当我单击下拉按钮时，我的按钮不会保持活动状态并打开半秒然后再次关闭。有人能指导我如何用 JS 保持打开状态吗？到目前为止，这是我的代码！将不胜感激的帮助！顺便说一句，我不知道一个项目，所以这就是为什么它在埃隆·马斯克身上，哈哈。

let menu_icons = document.querySelector('.menu-icons'),
nav = document.querySelector('nav');

menu_icons.addEventListener('click', () => {
    nav.classList.toggle('active');
});
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Poppins', sans-serif;
}

#fullscreen-video-container {
    position: absolute;
    top: 0;
    left: 0;
    scale: 100%;
    overflow: hidden;
    z-index: -10;
  }
  
  #fullscreen-video-container video {
    object-fit: cover;
    width: 100%;
    height: 100%;
  }

img {
    top: 5px;
    position: relative; 
    height: 200px;
    width: 200px;
    
  }
:root {
    --main-color: rgb(228, 145, 37);
}

html {
    font-size: 10px;
}

body {
   
    background-attachment: fixed;
    background-size: cover;
    background-repeat: no-repeat;
    min-height: 100vh;
    overflow-x: hidden;    
}

body::before {
    position: absolute;
    min-height: 100vh;
    content: '';
    width: 100%;
 
}

a {
    text-decoration: none;
}

ul {
    list-style: none;
}

header {
    width: 100%;
    position: absolute;
    top: 0;
    left: 0;
}

.container {
    width: 100%;
    margin: 0 auto;
}

.menu-icons {
    display: none;
    align-items: center;
    justify-content: center;
    color: #eee;
    font-size: 2rem;
    position: absolute;
    top: 50%;
    right: 2rem;
    transform: translateY(-50%);
    -webkit-transform: translateY(-50%);
    -moz-transform: translateY(-50%);
    -ms-transform: translateY(-50%);
    -o-transform: translateY(-50%);
    cursor: pointer;
    z-index: 1500;
    /* display: none; */
}

nav {
    width: 100%;
    border-radius: 1px solid rgba(255, 255, 255, 0.1);
    -webkit-border-radius: 1px solid rgba(255, 255, 255, 0.1);
    -moz-border-radius: 1px solid rgba(255, 255, 255, 0.1);
    -ms-border-radius: 1px solid rgba(255, 255, 255, 0.1);
    -o-border-radius: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    height: 60px;
   
    justify-content: center;
    gap: 2rem;
}


.nav-list {
    display: flex;
    align-items: center;
}

.nav-list li {
    line-height: 8rem;
    position: relative
}

.sub-menu li {
    line-height: 4rem;
}

.nav-list a {
    display: block;
    color: #eee;
    padding: 0 1.5rem;
    font-size: 1.4rem;
    text-transform: uppercase;
    transition: color 650ms;
    -webkit-transition: color 650ms;
    -moz-transition: color 650ms;
    -ms-transition: color 650ms;
    -o-transition: color 650ms;
    position: relative;
    width: 100%;
    align-items: center;
    top: 15px;
    margin-left: 50px;
    
}

.nav-list a:active {
    color: var(--main-color);
}

.btn {
    padding: 1.3rem;
    display: inline-block;
    border: 2px solid var(--main-color);
    border-radius: 0.5rem;
    -webkit-border-radius: 0.5rem;
    -moz-border-radius: 0.5rem;
    -ms-border-radius: 0.5rem;
    -o-border-radius: 0.5rem;
    transition: background-color 650ms;
    -webkit-transition: background-color 650ms;
    -moz-transition: background-color 650ms;
    -ms-transition: background-color 650ms;
    -o-transition: background-color 650ms;
}

.btn:active {
    color: var(--main-color);
}

.sub-menu {
    width: 20rem;
    display: block;
    position: absolute;
    border-top: 3px solid var(--main-color);
    background-color: #ff2222;
    z-index: 100;
    top: 16rem;
    transition: all 250ms ease;
    -webkit-transition: all 250ms ease;
    -moz-transition: all 250ms ease;
    -ms-transition: all 250ms ease;
    -o-transition: all 250ms ease;
    opacity: 0;
    visibility: hidden;
}

.sub-menu::before {
    content: '';
    position: absolute;
    top: -2.5rem;
    left: 3rem;
    border: 1.2rem solid transparent;
    border-bottom: 1.2rem solid var(--main-color);
}

.sub-menu .sub-menu::before {
    top: .9rem;
    left: -2.5rem;
    border: 1.2rem solid transparent;
    border-right-color: var(--main-color);
}

.sub-menu .sub-menu {
    border-top: none;
    border-left: 3px solid var(--main-color);
    top: 0;
    left: 160%;
}


.nav-list li:active>.sub-menu {
    top: 8rem;
    opacity: 1;
    visibility: visible;
}

.sub-menu li:active>.sub-menu {
    top: 0;
    left: 100%;
}

li.move-right {
    margin: auto 0 auto auto;
    line-height: initial;
}

@media screen  and (max-width: 900px) {
    .nav-list {
        position: fixed;
        top: 0;
        height: 100vh;
        flex-direction: column;
        background-color: #191919;
        z-index: 1000;
        align-items: initial;
        display: none;
        overflow-y: scroll;
        width: 50%;
        right: 0;
    }

    .nav-list > li {
        line-height: 6rem;
    }

    .sub-menu {
        position: initial;
        border: 3px solid transparent;
        margin-left: 1rem;
        max-height: 0;
        background: rgba(0, 0, 0, 0.5);
        overflow: hidden;
        margin-right: 0.4rem;
        padding-right: 1rem;
    }

    .sub-menu .sub-menu {
        border: none;
        overflow: hidden;
        margin-right: 0.4rem;
    }

    .sub-menu::before {
        display: none;
    }

    .nav-list li:active > .sub-menu {
        opacity: 1;
        visibility: visible;
        max-height: initial;
    }

    li.move-right {
        margin: 0 auto 0 0;
        line-height: initial;
    }

    .menu-icons {
        display: block;
    }

    .fa-times {
        display: none;
    }

    nav.active .fa-times {
        display: block;
    }

    nav.active .fa-bars {
        display: none;
    }
    
    nav.active .nav-list {
        display: flex;
    }
}
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.14.0/css/all.min.css">
    <link rel="stylesheet" href="{{ url_for('static', filename='CSS/test.css') }}">
    <title>Document</title>
</head>
<body>
    <header>
        <div class="container">
            <nav>
                <div class="menu-icons">
                   <i class="fas fa-bars"></i>
                   <i class="fas fa-times"></i>
                </div>

                <a href="#" class="logo"><img class="logo" src="{{ url_for('static', filename='Images/logo2.png') }}"></a>

                <ul class="nav-list">
                    <li>
                        <a href="#">Home</a>
                    </li>

                    
                  <li>
                    <a href="#">ELON MUSK</a>
                </li>
                <li>
                  <a href="#">THROUGH TIME</a>
              </li>

                    <li>
                        <a href="#">ELON ODYSSEY <i class="fas fa-caret-down"></i></a>
                        <ul class="sub-menu">
                            <li>
                                <a href="#">SPACE X</a>
                            </li>

                            <li>
                              <a href="#">NEUROLINK</a>
                          </li>
                          <li>
                            <a href="#">TESLA</a>
                          </li>
                          
                        </ul>

                    </li>

                   
                    <li>
                        <a href="#">MORE
                            <i class="fas fa-caret-down"></i>
                        </a>
                        <ul class="sub-menu">
                            <li>
                                <a href="#">DOGE</a>
                            </li>
                            <li>
                              <a href="#">FORUMS</a>
                          </li>
                          <li>
                            <a href="#">BLOGS</a>
                          </li>
                        </ul>
                    </li>
                    
                    
  
                </ul>
                
            </nav>
        </div>
    </header>

    <div id="fullscreen-video-container">
      <video autoplay loop muted>
          <source src="{{ url_for('static', filename='/Videos/Background.mp4') }}">
      </video>
  </div>

      
    <script src="{{ url_for('static', filename='js/test.js') }}"></script>
</body>
</html>

javascript html css button
1个回答
0
投票

你已经很接近了。您需要将 

.nav-list li:active > .sub-menu
更改为 
.nav-list li.active > .sub-menu
并添加一些 js 以在单击菜单项时切换活动类：

let menu_lis = document.querySelectorAll('.nav-list li');
for (let menu_li of menu_lis) {
  menu_li.addEventListener('click', () => {
    menu_li.classList.toggle('active');
  });
  
}

这是一个工作示例片段。

let menu_icons = document.querySelector('.menu-icons');
let nav = document.querySelector('nav');

menu_icons.addEventListener('click', () => {
    nav.classList.toggle('active');
});

let menu_lis = document.querySelectorAll('.nav-list li');
for (let menu_li of menu_lis) {
  menu_li.addEventListener('click', () => {
    menu_li.classList.toggle('active');
  });
  
}
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Poppins', sans-serif;
}

#fullscreen-video-container {
    position: absolute;
    top: 0;
    left: 0;
    scale: 100%;
    overflow: hidden;
    z-index: -10;
  }
  
  #fullscreen-video-container video {
    object-fit: cover;
    width: 100%;
    height: 100%;
  }

img {
    top: 5px;
    position: relative; 
    height: 200px;
    width: 200px;
    
  }
:root {
    --main-color: rgb(228, 145, 37);
}

html {
    font-size: 10px;
}

body {
   
    background-attachment: fixed;
    background-size: cover;
    background-repeat: no-repeat;
    min-height: 100vh;
    overflow-x: hidden;    
}

body::before {
    position: absolute;
    min-height: 100vh;
    content: '';
    width: 100%;
 
}

a {
    text-decoration: none;
}

ul {
    list-style: none;
}

header {
    width: 100%;
    position: absolute;
    top: 0;
    left: 0;
}

.container {
    width: 100%;
    margin: 0 auto;
}

.menu-icons {
    display: none;
    align-items: center;
    justify-content: center;
    color: #eee;
    font-size: 2rem;
    position: absolute;
    top: 50%;
    right: 2rem;
    transform: translateY(-50%);
    -webkit-transform: translateY(-50%);
    -moz-transform: translateY(-50%);
    -ms-transform: translateY(-50%);
    -o-transform: translateY(-50%);
    cursor: pointer;
    z-index: 1500;
    /* display: none; */
}

nav {
    width: 100%;
    border-radius: 1px solid rgba(255, 255, 255, 0.1);
    -webkit-border-radius: 1px solid rgba(255, 255, 255, 0.1);
    -moz-border-radius: 1px solid rgba(255, 255, 255, 0.1);
    -ms-border-radius: 1px solid rgba(255, 255, 255, 0.1);
    -o-border-radius: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    height: 60px;
   
    justify-content: center;
    gap: 2rem;
}


.nav-list {
    display: flex;
    align-items: center;
}

.nav-list li {
    line-height: 8rem;
    position: relative
}

.sub-menu li {
    line-height: 4rem;
}

.nav-list a {
    display: block;
    color: #eee;
    padding: 0 1.5rem;
    font-size: 1.4rem;
    text-transform: uppercase;
    transition: color 650ms;
    -webkit-transition: color 650ms;
    -moz-transition: color 650ms;
    -ms-transition: color 650ms;
    -o-transition: color 650ms;
    position: relative;
    width: 100%;
    align-items: center;
    top: 15px;
    margin-left: 50px;
    
}

.nav-list a:active {
    color: var(--main-color);
}

.btn {
    padding: 1.3rem;
    display: inline-block;
    border: 2px solid var(--main-color);
    border-radius: 0.5rem;
    -webkit-border-radius: 0.5rem;
    -moz-border-radius: 0.5rem;
    -ms-border-radius: 0.5rem;
    -o-border-radius: 0.5rem;
    transition: background-color 650ms;
    -webkit-transition: background-color 650ms;
    -moz-transition: background-color 650ms;
    -ms-transition: background-color 650ms;
    -o-transition: background-color 650ms;
}

.btn:active {
    color: var(--main-color);
}

.sub-menu {
    width: 20rem;
    display: block;
    position: absolute;
    border-top: 3px solid var(--main-color);
    background-color: #ff2222;
    z-index: 100;
    top: 16rem;
    transition: all 250ms ease;
    -webkit-transition: all 250ms ease;
    -moz-transition: all 250ms ease;
    -ms-transition: all 250ms ease;
    -o-transition: all 250ms ease;
    opacity: 0;
    visibility: hidden;
}

.sub-menu::before {
    content: '';
    position: absolute;
    top: -2.5rem;
    left: 3rem;
    border: 1.2rem solid transparent;
    border-bottom: 1.2rem solid var(--main-color);
}

.sub-menu .sub-menu::before {
    top: .9rem;
    left: -2.5rem;
    border: 1.2rem solid transparent;
    border-right-color: var(--main-color);
}

.sub-menu .sub-menu {
    border-top: none;
    border-left: 3px solid var(--main-color);
    top: 0;
    left: 160%;
}


.nav-list li:active>.sub-menu {
    top: 8rem;
    opacity: 1;
    visibility: visible;
}

.sub-menu li:active>.sub-menu {
    top: 0;
    left: 100%;
}

li.move-right {
    margin: auto 0 auto auto;
    line-height: initial;
}

@media screen  and (max-width: 900px) {
    .nav-list {
        position: fixed;
        top: 0;
        height: 100vh;
        flex-direction: column;
        background-color: #191919;
        z-index: 1000;
        align-items: initial;
        display: none;
        overflow-y: scroll;
        width: 50%;
        right: 0;
    }

    .nav-list > li {
        line-height: 6rem;
    }

    .sub-menu {
        position: initial;
        border: 3px solid transparent;
        margin-left: 1rem;
        max-height: 0;
        background: rgba(0, 0, 0, 0.5);
        overflow: hidden;
        margin-right: 0.4rem;
        padding-right: 1rem;
    }

    .sub-menu .sub-menu {
        border: none;
        overflow: hidden;
        margin-right: 0.4rem;
    }

    .sub-menu::before {
        display: none;
    }

    .nav-list li.active > .sub-menu {
        opacity: 1;
        visibility: visible;
        max-height: initial;
    }

    li.move-right {
        margin: 0 auto 0 0;
        line-height: initial;
    }

    .menu-icons {
        display: block;
    }

    .fa-times {
        display: none;
    }

    nav.active .fa-times {
        display: block;
    }

    nav.active .fa-bars {
        display: none;
    }
    
    nav.active .nav-list {
        display: flex;
    }
}
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.14.0/css/all.min.css">
    <link rel="stylesheet" href="{{ url_for('static', filename='CSS/test.css') }}">
    <title>Document</title>
</head>
<body>
    <header>
        <div class="container">
            <nav>
                <div class="menu-icons">
                   <i class="fas fa-bars"></i>
                   <i class="fas fa-times"></i>
                </div>

                <a href="#" class="logo"><img class="logo" src="{{ url_for('static', filename='Images/logo2.png') }}"></a>

                <ul class="nav-list">
                    <li>
                        <a href="#">Home</a>
                    </li>

                    
                  <li>
                    <a href="#">ELON MUSK</a>
                </li>
                <li>
                  <a href="#">THROUGH TIME</a>
              </li>

                    <li>
                        <a href="#">ELON ODYSSEY <i class="fas fa-caret-down"></i></a>
                        <ul class="sub-menu">
                            <li>
                                <a href="#">SPACE X</a>
                            </li>

                            <li>
                              <a href="#">NEUROLINK</a>
                          </li>
                          <li>
                            <a href="#">TESLA</a>
                          </li>
                          
                        </ul>

                    </li>

                   
                    <li>
                        <a href="#">MORE
                            <i class="fas fa-caret-down"></i>
                        </a>
                        <ul class="sub-menu">
                            <li>
                                <a href="#">DOGE</a>
                            </li>
                            <li>
                              <a href="#">FORUMS</a>
                          </li>
                          <li>
                            <a href="#">BLOGS</a>
                          </li>
                        </ul>
                    </li>
                    
                    
  
                </ul>
                
            </nav>
        </div>
    </header>

    <div id="fullscreen-video-container">
      <video autoplay loop muted>
          <source src="{{ url_for('static', filename='/Videos/Background.mp4') }}">
      </video>
  </div>

      
    <script src="{{ url_for('static', filename='js/test.js') }}"></script>
</body>
</html>

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