CSS HTML 子列表项行连接到父项 [英] CSS HTML Sub List Items lines connected to parent
问题描述
我目前有一个动态生成的任务列表.每个任务都显示为一个列表项目,并且正在工作.我正在尝试添加子任务.我能够静态添加 2 个子任务,但无法添加更多子任务,因为连接到父任务的线是静态的.是否可以在此处动态添加子任务,并为每个添加的子项连接到父级?
I currently have a task list that is generated dynamically. Each task displays as a list item, and is working. I am trying to add sub tasks. I was able to add 2 sub tasks statically, but more cannot be added, as the lines connecting to the parent task are static. Is is possible to dynamically add sub tasks here, and have a line connect to the parent for each added sub item?
ul {
list-style: none;
}
ul.main::before {
content: "";
border: solid 2px black;
border-width: 0 0 0 2px;
position: absolute;
height: 160px;
margin-left: 10px;
z-index: -1;
}
.items::before {
display: inline-block;
content: "";
border: solid 2px black;
width: 25px;
height: 25px;
margin-right: 10px;
background: white;
}
.subitems1,
.subitems2 {
margin-left: 50px;
border: solid 2px white;
text-align: center;
width: 150px;
}
.subitems1::before {
position: absolute;
display: inline-block;
content: "";
border: solid 2px black;
border-width: 0px 0px 2px 2px;
border-radius: 0 25px;
width: 54px;
height: 25px;
margin-left: -110px;
margin-top: -10px;
}
.subitems2::before {
position: absolute;
display: inline-block;
content: "";
border: solid 2px black;
border-width: 0px 0px 2px 2px;
border-radius: 0 25px;
width: 63px;
height: 50px;
margin-left: -115px;
margin-top: -40px;
}
<ul class="main">
<li class="items">Task 1</li>
<li class="items">Task 2
<ul>
<li class="subitems1">Sub Task 1</li>
<li class="subitems2">Sub Task 2</li>
</ul>
</li>
<li class="items">Task 3</li>
</ul>
推荐答案
您可以使用 pseudo
元素来实现这种结构.
You can use pseudo
elements to achieve this structure.
我用 <span>
标签包裹了每个孩子,并在其上使用了 ::before
元素.
I have wrapped each child with <span>
tag and used ::before
element on that.
ul {
list-style: none;
}
ul.sub-menu {
position: relative;
padding: 0;
margin-left: 30px;
margin-top: 10px;
}
li.item span {
position: relative;
}
ul.sub-menu li.item span::before {
content: '';
height: 100%;
width: 10px;
border-bottom: 1px solid #000;
border-left: 1px solid #000;
position: absolute;
bottom: 10px;
left: -10px;
z-index: -1;
}
<ul class="main">
<li class="items">Task 1</li>
<li class="items">Task 2
<ul class="sub-menu">
<li class="item"><span>Sub Task 1</span></li>
<li class="item"><span>Sub Task 2</span>
<ul class="sub-menu">
<li class="item"><span>Sub Task 1</span></li>
<li class="item"><span>Sub Task 2</span></li>
</ul>
</li>
</ul>
</li>
<li class="items">Task 3</li>
</ul>
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