我有默认情况下隐藏的内容。单击按钮时,我希望所选的内容显示其内容。即,如果在第二个菜单上单击“查找更多” div
,则显示该div的内容。
到目前为止的方法:
function showClass(a) {
var e = [];
var e = document.getElementsByClassName(a);
for (elem of e) {
if (!elem) return true;
if (elem.style.display == "none") {
elem.style.display = "block"
} else {
elem.style.display = "none"
}
}
return true;
}
.list {
display: none;
}
a {
cursor: pointer;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="list">
<ul>
<li>list 1</li>
<li>list 2</li>
<li>list 3</li>
</ul>
</div>
<div class="list">
<ul>
<li>list 4</li>
<li>list 5</li>
<li>list 6</li>
</ul>
</div>
<div class="list">
<ul>
<li>list 7</li>
<li>list 8</li>
<li>list 9</li>
</ul>
</div>
<a onclick="showClass('list');" class="loadMoreBtn">Find out more</a>
我要去哪里错了?
您有几个问题:
document.getElementsByClassName(a);
(注意document
)HTMLCollection
(由返回getElementsByClassName
),你应该使用.forEach
,for...of
或定期for
循环。for...in
建议不要使用这种方法来迭代集合,因为要对对象的属性进行迭代。因此,for..in
循环可以提供HTMLCollection的意外属性,例如length
在使用它进行迭代时(相反,您所需要的只是该节点)function showClass(a) {
// var e = []; <-- no need for this \/ redeclared below
var e = document.getElementsByClassName(a);
for (elem of e) {
if (!elem) return true;
if (elem.style.display == "none") {
elem.style.display = "block"
} else {
elem.style.display = "none"
}
}
return true;
}
.list {
display: none;
}
a {
cursor: pointer;
}
<div>
<ul class="list">
<p>sample text</p>
<li>list 1</li>
<li>list 2</li>
<li>list 3</li>
</ul>
</div>
<div>
<ul class="list">
<li>list 4</li>
<li>list 5</li>
<li>list 6</li>
</ul>
</div>
<div>
<ul class="list">
<p>sample text</p>
<li>list 7</li>
<li>list 8</li>
<li>list 9</li>
</ul>
</div>
<a onclick="showClass('list');" class="loadMoreBtn">Find out more</a>
要为每个项目/ div具有单独的按钮,可以为每个项目指定一个ID,然后通过将其作为参数传递来切换ID:
function showClass(id) {
var elem = document.getElementById(id);
var visible = getComputedStyle(elem).display == "block";
if (!visible) {
elem.style.display = "block"
} else {
elem.style.display = "none"
}
}
.list {
display: none;
}
a {
cursor: pointer;
}
<div>
<ul class="list" id="list-one">
<li>list 1</li>
<li>list 2</li>
<li>list 3</li>
</ul>
</div>
<div>
<ul class="list" id="list-two">
<li>list 4</li>
<li>list 5</li>
<li>list 6</li>
</ul>
</div>
<div>
<ul class="list" id="list-three">
<li>list 7</li>
<li>list 8</li>
<li>list 9</li>
</ul>
</div>
<a onclick="showClass('list-one');" class="loadMoreBtn">Find out more - Item 1</a>
<br />
<a onclick="showClass('list-two');" class="loadMoreBtn">Find out more - Item 2</a>
<br />
<a onclick="showClass('list-three');" class="loadMoreBtn">Find out more - Item 3</a>
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