一次只能打开一个手风琴标签

Question

我的手风琴效果非常好,它在网站上看起来很棒并且可以正常工作.但是,我正在尝试为它添加更多JavaScript功能,以使其看起来更专业.

目前,手风琴允许您一次打开多个面板,即如果我打开一个标签,然后打开另一个标签,则两个标签将同时打开.关闭这些面板的唯一方法是重新点击标题.

我想要的是一些JavaScript代码,可以防止多个标签一次打开,所以如果我点击一个新面板,它应该首先关闭现有的打开面板.这是我的手风琴的HTML代码:

<div class="accordion"><b>Heading 1</b></div>
<div class="panel">
    <p class="text-light">Text 1</p>
</div>
<div class="accordion"><b>Heading 2</b></div>
<div class="panel">
    <p class="text-light">Text 2</p>
</div>

这是我在单独的JavaScript文件中的JavaScript代码,目前允许一次打开多个选项卡

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

for (i = 0; i < acc.length; i++) {
    acc[i].onclick = function() {
        this.classList.toggle("active");
        this.nextElementSibling.classList.toggle("show");
    }
}

不确定你是否需要所有的CSS,但是用于显示面板的CSS

div.panel.show {
    display: block !important;
}

希望有人可以提供帮助!提前致谢!

Answer 1

为此,您需要在每次单击时将手风琴的状态重置回其原始状态,然后在单击的元素上设置所需的类.为此,您可以提取功能,将类名设置为自己的函数,并根据需要调用它.试试这个:

var acc = document.getElementsByClassName("accordion");
var panel = document.getElementsByClassName('panel');

for (var i = 0; i < acc.length; i++) {
    acc[i].onclick = function() {
        var setClasses = !this.classList.contains('active');
        setClass(acc, 'active', 'remove');
        setClass(panel, 'show', 'remove');

        if (setClasses) {
            this.classList.toggle("active");
            this.nextElementSibling.classList.toggle("show");
        }
    }
}

function setClass(els, className, fnName) {
    for (var i = 0; i < els.length; i++) {
        els[i].classList[fnName](className);
    }
}

工作实例

Answer 2

在打开选定的选项卡之前关闭所有打开的选项卡。这将防止同时打开多个选项卡。

// Get all Accordion and Panel
let accHeading = document.querySelectorAll(".accordion");
let accPanel = document.querySelectorAll(".accordion-panel");

for (let i = 0; i < accHeading.length; i++) {
    // Execute whenever an accordion is clicked 
    accHeading[i].onclick = function() {
        if (this.nextElementSibling.style.maxHeight) {
           hidePanels();     // Hide All open Panels 
        } else {
           showPanel(this);  // Show the panel
        } 
    };
}

// Function to Show a Panel
function showPanel(elem) {
  hidePanels();
  elem.classList.add("active");
  elem.nextElementSibling.style.maxHeight = elem.nextElementSibling.scrollHeight + "px";
}

// Function to Hide all shown Panels
function hidePanels() {
  for (let i = 0; i < accPanel.length; i++) {
      accPanel[i].style.maxHeight = null;
      accHeading[i].classList.remove("active");
  }
}

* {box-sizing: border-box;}

/* Style the Headings that are used to open and close the accordion panel */
.accordion {
  background-color: #eee;
  color: #444;
  cursor: pointer;
  padding: 18px;
  margin: 0;
  font-weight: 300;
}

/* Change color of the heading and icon (on hover and click) */
.active, .accordion:hover, .accordion:hover::after {
  background-color: #007eff;
  color: white;
}

/* Add "plus" sign (+) after Accordion */
.accordion::after {
  content: '\002B';
  color: #777;
  font-weight: bold;
  float: right;
}

/* Add "minus" sign (-) after Accordion (when accordion is active) */
.active::after {
  content: "\2212";
  color: white;
}

/* Style the accordion panel */
.accordion-panel {
  padding: 0 18px;
  overflow: hidden;
  max-height: 0;
  transition: max-height 0.2s ease-out;
}

<div style="border: 1px solid lightgray;">
  <h2 class="accordion">Section 1</h2>
  <div class="accordion-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>

  <h2 class="accordion">Section 2</h2>
  <div class="accordion-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>

  <h2 class="accordion">Section 3</h2>
  <div class="accordion-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>

  <h2 class="accordion">Section 4</h2>
  <div class="accordion-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>