如何创建多层手风琴菜单?
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我正在尝试使用纯javascript创建多层或嵌套的手风琴菜单。整个功能正常运行,只需要解决一个问题:当我单击菜单的一个元素时,整个功能都会做出反应。
这不适用于当前项目。在完成基础课程之后,我只是想扩展我的知识。
我知道解决此问题的简便方法是将函数复制三遍,然后专门针对数组中的每个节点(即使是正确的单词?)。但是,我认为那是做事的错误方式。如您所见,我试图为多个变量创建一个循环。我认为这可能是我的问题,因为这似乎是将所有这些联系在一起的东西。
var accordion = document.getElementsByClassName("accordion");
var dropdown = document.getElementsByClassName("dropdown");
var accordionArrow = document.getElementsByClassName("accordionArrow");
var dropdownArrow = document.getElementsByClassName("dropdownArrow");
var content = document.getElementsByClassName("content");
function accordionFunction()
for (j = 0, k = 0, l = 0, m = 0; j < dropdown.length, k < accordionArrow.length, l < dropdownArrow.length, m < content.length; j++, k++, l++, m++)
if (dropdown[j].style.maxHeight)
dropdown[j].style.maxHeight = null;
accordionArrow[k].style.transform = null;
content[m].style.maxHeight = null;
dropdownArrow[l].style.transform = null;
else
dropdown[j].style.maxHeight = dropdown[j].scrollHeight + "px";
accordionArrow[k].style.transform = "rotate(-135deg)";
;
for (var i = 0; i < accordion.length; i++)
accordion[i].addEventListener("click", accordionFunction);
;
function accordionSubmenu()
for (l = 0, m = 0; l < dropdown.length, m < content.length; l++, m++)
if (content[m].style.maxHeight)
content[m].style.maxHeight = null;
dropdownArrow[l].style.transform = null;
else
content[m].style.maxHeight = content[m].scrollHeight + "px";
dropdownArrow[l].style.transform = "rotate(-135deg)";
;
for (j = 0; j < dropdown.length; j++)
dropdown[j].addEventListener("click", accordionSubmenu)
;
body
margin: auto;
width: 600px;
div
margin: auto;
.accordion
background-color: lightblue;
color: white;
padding: 3%;
cursor: pointer;
width: 300px;
height: 50px;
.accordion .accordionArrow
border: solid white;
border-width: 0 3px 3px 0;
display: inline-block;
padding: 3px;
transform: rotate(45deg);
.dropdown
color: lightblue;
padding-left: 3%;
cursor: pointer;
width: 300px;
max-height: 0;
overflow: hidden;
transition-duration: 0.2s;
.dropdown .dropdownArrow
border: solid lightblue;
border-width: 0 3px 3px 0;
display: inline-block;
padding: 3px;
transform: rotate(45deg);
.content
font-weight: bold;
transition: all 0.2s ease;
padding-left: 5%;
max-height: 0;
overflow: hidden;
<div>
<h2 class="accordion">Main 1<i class="accordionArrow"></i></h2>
<h3 class="dropdown">Submenu 1<i class="dropdownArrow"></i></h3>
<p class="content">Hello there. We are exposed.</p>
</div>
<div>
<h2 class="accordion">Main 2<i class="accordionArrow"></i></h2>
<h3 class="dropdown">Submenu 1<i class="dropdownArrow"></i></h3>
<p class="content">Hello there. We are exposed again!</p>
</div>
<div>
<h2 class="accordion">Main 3<i class="accordionArrow"></i></h2>
<h3 class="dropdown">Submenu 1<i class="dropdownArrow"></i></h3>
<p class="content">Hello there. We are exposed thrice!</p>
</div>
答案
通过巧妙地使用this
关键字(触发事件处理程序的元素)和nextElementSibling
属性,您可以更优雅地实现这一目标。
我创建了一个使最大高度为0的元素的类。因此,现在我可以通过添加或删除此类来隐藏和显示元素。
在手风琴函数中,我在单击元素之后切换该类的元素,并删除所有其他元素的类。
在手风琴子菜单中,我只是在nextElementSibling
上切换班级。
我个人将使用不同的html结构,通过使用更多级别的元素可以更轻松地切换类,因此您只需要1个函数即可获得x个子菜单。也许对您来说是一个不错的新挑战。
document.querySelectorAll('.accordion').forEach((accordion) => accordion.addEventListener('click', function()
//Get All possible hidden elements and loop over it.
document.querySelectorAll('.dropdown, .content').forEach((collapsible) =>
//If current element is the same is the next sibling element of the event target toggle the class. Otherwise add it.
if(collapsible === this.nextElementSibling)
collapsible.classList.toggle('maxHeightZero');
else
collapsible.classList.add('maxHeightZero');
);
));
document.querySelectorAll('.dropdown').forEach((dropdown) => dropdown.addEventListener('click', function()
//toggle the nextElementSibling
this.nextElementSibling.classList.toggle('maxHeightZero');
));
body
margin: auto;
width: 600px;
div
margin: auto;
.accordion
background-color: lightblue;
color: white;
padding: 3%;
cursor: pointer;
width: 300px;
height: 50px;
.accordion .accordionArrow
border: solid white;
border-width: 0 3px 3px 0;
display: inline-block;
padding: 3px;
transform: rotate(45deg);
.dropdown
color: lightblue;
padding-left: 3%;
cursor: pointer;
width: 300px;
overflow: hidden;
transition-duration: 0.2s;
.dropdown .dropdownArrow
border: solid lightblue;
border-width: 0 3px 3px 0;
display: inline-block;
padding: 3px;
transform: rotate(45deg);
.content
font-weight: bold;
transition: all 0.2s ease;
padding-left: 5%;
overflow: hidden;
.maxHeightZero
max-height: 0;
<div>
<h2 class="accordion">Main 1<i class="accordionArrow"></i></h2>
<h3 class="dropdown maxHeightZero">Submenu 1<i class="dropdownArrow"></i></h3>
<p class="content maxHeightZero">Hello there. We are exposed.</p>
</div>
<div>
<h2 class="accordion">Main 2<i class="accordionArrow"></i></h2>
<h3 class="dropdown maxHeightZero">Submenu 1<i class="dropdownArrow"></i></h3>
<p class="content maxHeightZero">Hello there. We are exposed again!</p>
</div>
<div>
<h2 class="accordion">Main 3<i class="accordionArrow"></i></h2>
<h3 class="dropdown maxHeightZero">Submenu 1<i class="dropdownArrow"></i></h3>
<p class="content maxHeightZero">Hello there. We are exposed thrice!</p>
</div>
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