javascript - 单击时如何使用js隐藏可折叠元素

Question

我在我的项目中使用了 w3school 可折叠示例。我是 java 脚本的新手。我的项目工作正常，但是当我单击一个部分时，其他部分没有关闭。如果我单击一个，它将如何关闭，其他可折叠窗口将被关闭。我需要修改此功能，但我不能使用另一个引导示例，因为我有一些限制。我还需要在左侧添加一个图像，当它被点击时它会被改变。

var coll = document.getElementsByClassName("collapsible");
var i;

for (i = 0; i < coll.length; i++) {
  coll[i].addEventListener("click", function() {
    this.classList.toggle("active");
    var content = this.nextElementSibling;
    if (content.style.maxHeight){
      content.style.maxHeight = null;
    } else {
      content.style.maxHeight = content.scrollHeight + "px";
    } 
  });
}

.collapsible {
  background-color: #777;
  color: white;
  cursor: pointer;
  padding: 18px;
  width: 100%;
  border: none;
  text-align: left;
  outline: none;
  font-size: 15px;
}

.active, .collapsible:hover {
  background-color: #555;
}

.collapsible:after {
  content: '\002B';
  color: white;
  font-weight: bold;
  float: right;
  margin-left: 5px;
}

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

.content {
  padding: 0 18px;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.2s ease-out;
  background-color: #f1f1f1;
}

<button class="collapsible">Open Section 2</button>
<div class="content">
  <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="collapsible">Open Section 3</button>
<div class="content">
  <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>

标签： javascript

Answer 1

使用它应该可以完成工作。

var coll = document.getElementsByClassName("collapsible");

for (var i = 0; i < coll.length; i++) {
  coll[i].addEventListener("click", function() {
    // before opening the accordion, you close everything
    for (var j = 0; j < coll.length; j++) {
      coll[j].classList.remove("active");
      coll[j].nextElementSibling.style.maxHeight = null;
    }
    this.classList.toggle("active");
    var content = this.nextElementSibling;
    if (content.style.maxHeight) {
      content.style.maxHeight = null;
    } else {
      content.style.maxHeight = content.scrollHeight + "px";
    } 
  });
}