CSS last-child selector: select last-element of sp

2018-12-31 06:04发布

站内问答 / HTML/CSS
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<div class="commentList">
   <article class="comment " id="com21"></article>
   <article class="comment " id="com20"></article>
   <article class="comment " id="com19"></article>
   <div class="something"> hello </div>
</div>

I want to select #com19 ?

.comment {
    width:470px;
    border-bottom:1px dotted #f0f0f0;
    margin-bottom:10px;
}

.comment:last-child {
    border-bottom:none;
    margin-bottom:0;
}

That does not work as long as I do have another div.something as actual last child in the commentList. Is it possible to use the last-child selector in this case to select the last appearance of article.comment?

jsFiddle

5条回答
临风纵饮
2楼-- · 2018-12-31 06:04

Something that I think should be commented here that worked for me:

Use :last-child multiple times in the places needed so that it always gets the last of the last.

Take this for example:

.page.one .page-container .comment:last-child {
  color: red;
}
.page.two .page-container:last-child .comment:last-child {
  color: blue;
}
<p> When you use .comment:last-child </p>
<p> you only get the last comment in both parents </p>

<div class="page one">
  <div class="page-container">
    <p class="comment"> Something </p>
    <p class="comment"> Something </p>
  </div>

  <div class="page-container">
    <p class="comment"> Something </p>
    <p class="comment"> Something </p>
  </div>
</div>

<p> When you use .page-container:last-child .comment:last-child </p>
<p> you get the last page-container's, last comment </p>

<div class="page two">
  <div class="page-container">
    <p class="comment"> Something </p>
    <p class="comment"> Something </p>
  </div>

  <div class="page-container">
    <p class="comment"> Something </p>
    <p class="comment"> Something </p>
  </div>
</div>

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后来的你喜欢了谁
3楼-- · 2018-12-31 06:08

What about this solution?

div.commentList > article.comment:not(:last-child):last-of-type
{
    color:red; /*or whatever...*/
}
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人间绝色
4楼-- · 2018-12-31 06:16

I guess that the most correct answer is: Use :nth-child (or, in this specific case, its counterpart :nth-last-child). Most only know this selector by its first argument to grab a range of items based on a calculation with n, but it can also take a second argument "of [any CSS selector]".

Your scenario could be solved with this selector: .commentList .comment:nth-last-child(1 of .comment)

But being technically correct doesn't mean you can use it, though, because this selector is as of now only implemented in Safari.

For further reading:

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看风景的人
5楼-- · 2018-12-31 06:18

If you are floating the elements you can reverse the order

i.e. float: right; instead of float: left;

And then use this method to select the first-child of a class.

/* 1: Apply style to ALL instances */
#header .some-class {
  padding-right: 0;
}
/* 2: Remove style from ALL instances except FIRST instance */
#header .some-class~.some-class {
  padding-right: 20px;
}

This is actually applying the class to the LAST instance only because it's now in reversed order.

Here is a working example for you:

<!doctype html>
<head><title>CSS Test</title>
<style type="text/css">
.some-class { margin: 0; padding: 0 20px; list-style-type: square; }
.lfloat { float: left; display: block; }
.rfloat { float: right; display: block; }
/* apply style to last instance only */
#header .some-class {
  border: 1px solid red;
  padding-right: 0;
}
#header .some-class~.some-class {
  border: 0;
  padding-right: 20px;
}
</style>
</head>
<body>
<div id="header">
  <img src="some_image" title="Logo" class="lfloat no-border"/>
  <ul class="some-class rfloat">
    <li>List 1-1</li>
    <li>List 1-2</li>
    <li>List 1-3</li>
  </ul>
  <ul class="some-class rfloat">
    <li>List 2-1</li>
    <li>List 2-2</li>
    <li>List 2-3</li>
  </ul>
  <ul class="some-class rfloat">
    <li>List 3-1</li>
    <li>List 3-2</li>
    <li>List 3-3</li>
  </ul>
  <img src="some_other_img" title="Icon" class="rfloat no-border"/>
</div>
</body>
</html>
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余生无你
6楼-- · 2018-12-31 06:27

:last-child only works when the element in question is the last child of the container, not the last of a specific type of element. For that, you want :last-of-type

http://jsfiddle.net/C23g6/3/

As per @BoltClock's comment, this is only checking for the last article element, not the last element with the class of .comment.

html

<div class="commentList">
    <article class="comment " id="com21"></article>

    <article class="comment " id="com20"></article>

    <article class="comment " id="com19"></article>

    <div class="something"> hello </div>
</div>

css

body {
    background: black;
}

.comment {
    width:470px;
    border-bottom:1px dotted #f0f0f0;
    margin-bottom:10px;
}

.comment:last-of-type {
    border-bottom:none;
    margin-bottom:0;
}
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