html javascript折叠手风琴

时间：2017-05-25 23:35:56

标签： javascript html css

我在侧面导航窗口内有一个手风琴。如果我打开所有面板，如果我关闭侧面导航面板，它们将保持打开状态。当我的侧导航关闭时，我希望手风琴折叠。 我的代码已附上。

<!DOCTYPE html>
<html>
<head>
<style>
body {
    font-family: "Lato", sans-serif;
}

.sidenav {
    height: 100%;
    width: 0;
    position: fixed;
    z-index: 1;
    top: 0;
    left: 0;
    background-color: #111;
    overflow-x: hidden;
    transition: 0.5s;
    padding-top: 60px;
}

.sidenav a {
    padding: 8px 8px 8px 32px;
    text-decoration: none;
    font-size: 25px;
    color: #818181;
    display: block;
    transition: 0.3s;
}

.sidenav a:hover, .offcanvas a:focus{
    color: #f1f1f1;
}

.sidenav .closebtn {
    position: absolute;
    top: 0;
    right: 25px;
    font-size: 36px;
    margin-left: 50px;
}

#main {
    transition: margin-left .5s;
    padding: 16px;
}

@media screen and (max-height: 450px) {
  .sidenav {padding-top: 15px;}
  .sidenav a {font-size: 18px;}
}
button.accordion {
    background-color: #eee;
    color: #444;
    cursor: pointer;
    padding: 18px;
    width: 100%;
    border: none;
    text-align: left;
    outline: none;
    font-size: 15px;
    transition: 0.4s;
}

button.accordion.active, button.accordion:hover {
    background-color: #ddd;
}

button.accordion:after {
    content: '\002B';
    color: #777;
    font-weight: bold;
    float: right;
    margin-left: 5px;
}

button.accordion.active:after {
    content: "\2212";
}

div.panel {
    padding: 0 18px;
    background-color: white;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.2s ease-out;
}
</style>
</head>
<body>

<div id="mySidenav" class="sidenav">
  <a href="javascript:void(0)" class="closebtn" onclick="closeNav()">&times;</a>
  <button class="accordion">Section 1</button>
<div class="panel">
  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.</p>
</div>

<button class="accordion">Section 2</button>
<div class="panel">
  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.</p>
</div>

<button class="accordion">Section 3</button>
<div class="panel">
  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.</p>
</div>
</div>

<div id="main">
 
  <span style="font-size:30px;cursor:pointer" onclick="openNav()">&#9776; open</span>
</div>

<script>
function openNav() {
    document.getElementById("mySidenav").style.width = "250px";
    document.getElementById("main").style.marginLeft = "250px";
}

function closeNav() {
    document.getElementById("mySidenav").style.width = "0";
    document.getElementById("main").style.marginLeft= "0";
}

var acc = document.getElementsByClassName("accordion");
var i;

for (i = 0; i < acc.length; i++) {
  acc[i].onclick = function() {
    this.classList.toggle("active");
    var panel = this.nextElementSibling;
    if (panel.style.maxHeight){
      panel.style.maxHeight = null;
    } else {
      panel.style.maxHeight = panel.scrollHeight + "px";
    } 
  }
}
</script>
     
</body>
</html>

1 个答案:

答案 0 :(得分：0)

您可以创建一个打开/关闭面板的功能，然后在closeNav()中循环切换面板并关闭它们。

<!DOCTYPE html>
<html>

<head>
  <style>
    body {
      font-family: "Lato", sans-serif;
    }
    
    .sidenav {
      height: 100%;
      width: 0;
      position: fixed;
      z-index: 1;
      top: 0;
      left: 0;
      background-color: #111;
      overflow-x: hidden;
      transition: 0.5s;
      padding-top: 60px;
    }
    
    .sidenav a {
      padding: 8px 8px 8px 32px;
      text-decoration: none;
      font-size: 25px;
      color: #818181;
      display: block;
      transition: 0.3s;
    }
    
    .sidenav a:hover,
    .offcanvas a:focus {
      color: #f1f1f1;
    }
    
    .sidenav .closebtn {
      position: absolute;
      top: 0;
      right: 25px;
      font-size: 36px;
      margin-left: 50px;
    }
    
    #main {
      transition: margin-left .5s;
      padding: 16px;
    }
    
    @media screen and (max-height: 450px) {
      .sidenav {
        padding-top: 15px;
      }
      .sidenav a {
        font-size: 18px;
      }
    }
    
    button.accordion {
      background-color: #eee;
      color: #444;
      cursor: pointer;
      padding: 18px;
      width: 100%;
      border: none;
      text-align: left;
      outline: none;
      font-size: 15px;
      transition: 0.4s;
    }
    
    button.accordion.active,
    button.accordion:hover {
      background-color: #ddd;
    }
    
    button.accordion:after {
      content: '\002B';
      color: #777;
      font-weight: bold;
      float: right;
      margin-left: 5px;
    }
    
    button.accordion.active:after {
      content: "\2212";
    }
    
    div.panel {
      padding: 0 18px;
      background-color: white;
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.2s ease-out;
    }
  </style>
</head>

<body>

  <div id="mySidenav" class="sidenav">
    <a href="javascript:void(0)" class="closebtn" onclick="closeNav()">&times;</a>
    <button class="accordion">Section 1</button>
    <div class="panel">
      <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.</p>
    </div>

    <button class="accordion">Section 2</button>
    <div class="panel">
      <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.</p>
    </div>

    <button class="accordion">Section 3</button>
    <div class="panel">
      <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.</p>
    </div>
  </div>

  <div id="main">

    <span style="font-size:30px;cursor:pointer" onclick="openNav()">&#9776; open</span>
  </div>

  <script>
    
    var acc = document.getElementsByClassName("accordion");
    var i;
    
    function openNav() {
      document.getElementById("mySidenav").style.width = "250px";
      document.getElementById("main").style.marginLeft = "250px";
    }
    
    function closeNav() {
      document.getElementById("mySidenav").style.width = "0";
      document.getElementById("main").style.marginLeft = "0";
      for (i = 0; i < acc.length; i++) {
        closePanel(acc[i]);
      }
    }
    
    function openPanel(el) {
      el.classList.add("active");
      el.nextElementSibling.style.maxHeight = el.nextElementSibling.scrollHeight + "px";
    }
    
    function closePanel(el) {
      el.classList.remove("active");
      el.nextElementSibling.style.maxHeight = null;
    }
    
    for (i = 0; i < acc.length; i++) {
      acc[i].onclick = function() {
        if (this.classList.contains("active")) {
          closePanel(this);
        } else {
          openPanel(this);
        }
      };
    }
  </script>

</body>

</html>

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