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javascript - ClassList 在 IE9 中不起作用。需要替代功能

转载 作者:行者123 更新时间:2023-11-30 15:55:42 25 4
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我无法运行“W3Schools Accordion with symbols” ' 在 IE9 中。 ClassList 在 IE9 中不起作用。它给出以下错误

SCRIPT5007: Unable to get value of the property 'toggle': object is null or undefined 

I am not a coder. I need alternative function, so that I dont need to recreate my 1000 lines static HTML page.

Here is full code that I need to run in IE9

<!DOCTYPE html>
<html>
<head>
<style>
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: '\02795';
font-size: 13px;
color: #777;
float: right;
margin-left: 5px;
}

button.accordion.active:after {
content: "\2796";
}

div.panel {
padding: 0 18px;
background-color: white;
max-height: 0;
overflow: hidden;
transition: 0.6s ease-in-out;
opacity: 0;
}

div.panel.show {
opacity: 1;
max-height: 500px;
}
</style>
</head>
<body>

<h2>Accordion with symbols</h2>
<p>In this example we have added a "plus" sign to each button. When the user clicks on the button, the "plus" sign is replaced with a "minus" sign.</p>
<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 id="foo" 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>

<script>
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");
}
}
</script>

</body>
</html>

最佳答案

当您使用 jQuery 标记问题时,您可以使用 toggleClass(),如下所示:

$(".accordion").click(function(){
$(this).toggleClass("active").next().toggleClass("show");
});

$(function() {
$(".accordion").click(function() {
$(this).toggleClass("active").next().toggleClass("show");
});
});
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: '\02795';
font-size: 13px;
color: #777;
float: right;
margin-left: 5px;
}
button.accordion.active:after {
content: "\2796";
}
div.panel {
padding: 0 18px;
background-color: white;
max-height: 0;
overflow: hidden;
transition: 0.6s ease-in-out;
opacity: 0;
}
div.panel.show {
opacity: 1;
max-height: 500px;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<h2>Accordion with symbols</h2>
<p>In this example we have added a "plus" sign to each button. When the user clicks on the button, the "plus" sign is replaced with a "minus" sign.</p>
<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 id="foo" 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>

关于javascript - ClassList 在 IE9 中不起作用。需要替代功能,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/38589719/

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