[英]Creating a toggle button for expanding and collapsing an Accordion
我從W3Schools示例中為我正在處理的FAQ頁面創建了修改后的手風琴。 我是Java語言的新手,我需要一些幫助。 我想建立一個在展開所有面板和關閉所有面板之間切換的按鈕。 我可以從另一個人寫的創建“關閉所有面板”按鈕的博客文章中獲得一些幫助,但是現在我想構建一個函數,該功能可以在“全部關閉”和“全部打開”之間切換。 我還希望將所有這些都內聯,以便可以將這一頁代碼嵌入另一頁。 我已經附加了到目前為止創建的代碼。
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link href="https://fonts.googleapis.com/icon?family=Material+Icons" rel="stylesheet">
<style>
.accordion {
background-color: none;
cursor: pointer;
padding: 30px;
width: 100%;
border: #DADCE0;
border-style: solid;
border-width: 1px 0px 0px 0px;
text-align: left;
outline: none;
font-family: Google Sans, sans-serif;
font-weight: medium;
font-size: 18px;
line-height: 30px;
transition: 0.4s;
color: #1A73E8;
}
.accordion:hover {
color: #174EA6;
}
.active {
color: #174EA6;
border-top-color: #DADCE0;
border-bottom-color: #174EA6;
border-style: solid;
border-width: 1px 0px 2px 0px;
}
.accordion:after {
font-family: 'Material Icons';
content: "keyboard_arrow_down"; /*Google keyboard arrow down*/
font-weight: bold;
font-size: 24px;
float: right;
margin-left: 5px;
}
.active:after {
font-family: 'Material Icons';
content: "keyboard_arrow_up"; /*Google keyboard arrow up*/
font-weight: bold;
font-size: 24px;
float: right;
margin-left: 5px;
}
.panel {
padding: 0px 18px;
background-color: white;
max-height: 0;
overflow: hidden;
transition: max-height 0.4s ease-out;
}
.closeall {
float: right;
margin: 1% 2% 0 0;
cursor: pointer;
}
body {
font-family: Roboto Light, sans-serif;
line-height: 26px;
font-size: 16px;
color: #202124;
}
a {
color: #4285f4;
}
</style>
</head>
<body>
<button class="closeall" onclick="collapseall()">Close all</button>
<button class="accordion">Can I host my own events?</button>
<div class="panel">
<p>Of course you can!</p>
</div>
<button class="accordion">Are the events for students?</button>
<div class="panel">
<p>Yes, please see here.</p>
</div>
<button class="accordion">Are the events for teachers?</button>
<div class="panel">
<p>Yes, please see here.</p>
</div>
<button class="accordion">Are the events for teachers 2?</button>
<div class="panel">
<p>Yes, please see here 2.</p>
</div>
<script>
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";
}
}
}
function collapseall() { //problematic part
var x = document.getElementsByClassName("panel");
var b;
for (b = 0; b < x.length; b++) {
x[b].style.maxHeight = null;
x[b].previousElementSibling.classList.remove('active');
}
}
</script>
</body>
</html>
function collapseall() {
var x = document.getElementsByClassName("accordion");
var y = 0;
var b;
for (b = 0; b < x.length; b++) {
if(x[b].classList.contains('active'))y++;
}
if(x.length==y||y==0){
for (b = 0; b < x.length; b++) {
x[b].dispatchEvent(new Event('click'));
}
}else{
for (b = 0; b < x.length; b++) {
if(x[b].classList.contains('active'))
x[b].dispatchEvent(new Event('click'));
}
}
}
好消息是您正在接近一個適當的解決方案, 我在這里為您實施了該解決方案。 實現該目標的捷徑可能看起來像
// Single reference to all panels
// Getting them each time is heavy for the browser
var x = document.getElementsByClassName("panel");
// Indicator if we should open or close all panels
var isToggledOff = true;
然后,您需要兩個非常相似的功能來打開或折疊所有面板
function collapseAll() {
for (var b = 0; b < x.length; b++) {
x[b].style.maxHeight = null;
x[b].previousElementSibling.classList.remove('active');
}
}
function expandAll() {
for (var b = 0; b < x.length; b++) {
x[b].style.maxHeight = "58px";
x[b].previousElementSibling.classList.add('active');
}
}
最后但並非最不重要的一點是,您需要邏輯來決定我們是否要打開或關閉所有面板以及將來如何處理它們
function toggle() {
if (isToggledOff) this.expandAll();
else this.collapseAll();
isToggledOff = !isToggledOff
}
您可能需要考慮的其他事項
替代方式
var x = Array.from(document.getElementsByClassName("panel"));
var isToggledOff = true;
function toggle() {
x.forEach(el => el
.previousElementSibling
.classList
[isToggledOff ? "add" : "remove"]('active')
)
isToggledOff = !isToggledOff
}
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