[英]CSS selector to select a child in the parent's hierarchy
Using css selectors I want to set the background of the button as red if it is the only button present in the hierarchy of .parent
class. 如果使用CSS选择器,则我想将按钮的背景设置为红色(如果它是
.parent
类层次结构中唯一的按钮)。
I tried the below selector but it fails if the sibling of the button is inside a div. 我尝试了下面的选择器,但是如果按钮的兄弟位于div内则失败。
<style>
.parent .test:only-of-type {
background: red;
}
</style>
Case1: no button should be marked red (selector fails in this case) 情况1:没有按钮应标记为红色 (在这种情况下选择器失败)
<div class="parent">
<div class="boat">
<button class="test">This is a paragraph.</button>
</div>
<button class="test">This is a paragraph.</button>
<button class="test">This is a paragraph.</button>
<div class="other">
<button class="test">This is a paragraph.</button>
</div>
</div>
</div>
Case2: button should be marked red 情况2:按钮应标记为红色
<div class="parent">
<div class="boat">
<button class="test">This is a paragraph.</button>
</div>
</div>
</div>
Case3: no button should be marked red (selector fails in this case) 情况3:不应将任何按钮标记为红色 (在这种情况下选择器将失败)
<div class="parent">
<div class="boat">
<button class="test">This is a paragraph.</button>
</div>
<div class="other">
<button class="test">This is a paragraph.</button>
</div>
</div>
</div>
To get the button red inside of the boat div you can use the selector: 要使Boat div内部的按钮变为红色,可以使用选择器:
.parent > .boat > .test {
}
You could use the :only-child
selector: 您可以使用
:only-child
选择器:
.parent > .boat:only-child > .test:only-child, .parent > .test:only-child { color: red; }
<div class="parent"> <div class="boat"> <button class="test">not red.</button> </div> <div class="other"> <button class="test">not red.</button> </div> </div> <div class="parent"> <div class="boat"> <button class="test">not red.</button> </div> <button class="test">not red.</button> <button class="test">not red.</button> <div class="other"> <button class="test">not red.</button> </div> </div> <div class="parent"> <div class="boat"> <button class="test">red.</button> </div> </div>
Update 更新
Selector explained: 选择器说明:
.parent
- start with your parent .parent
从您的父母开始 > .boat:only-child
greater than ( >
) means direct child so this means that .boat
has to be a direct child of .parent
and the only child (this is the :only-child
bit) > .boat:only-child
大于( >
)表示直接子代,因此这意味着.boat
必须是.boat
的直接.parent
且是唯一子代(这是:only-child
位) > .test:only-child
again this means that .test
has to be a direct child of .boat
and the only child > .test:only-child
再次是> .test:only-child
,这意味着.test
必须是.boat
的直接子代,并且是唯一子代 The second selector is optional - in case you just have a button without the boat div 第二个选择器是可选的-如果您只有一个按钮而没有Boat div
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