使CSS伪元素：在与主元素相同的高度之前

Question

我一直在寻找并且未能自己找到解决方案。我正在尝试创建一个基本的可满足代码编辑器，对于行号，我选择在CSS伪元素中使用计数器设置的每一行使用段落。

.editor {
	display: inline-block;
    border: 1px black solid;
    font-family: "Consolas", "Monaco", "Courier New", monospace;
    counter-reset: line;
	
	width:90%;
	height:350px;
	overflow:scroll;
	padding-left:0;
	margin-left:0;
	z-index:1;
	
}
.editor p {
	display: block;
    counter-increment: line;
	background-color:#FFF;
	text-align:left;
	margin:0px;
	z-index:2;
	outline: none;
	
}
.editor p:before {
	display:inline-block;
    width:2em;
	height:100%;
    border-right: 1px black solid;
    padding-right: 1em;
    margin-right: 1em;
    content: counter(line);
	color:#FFF;
	background-color:#006;
	text-align:right;
	
	/*-webkit-user-select: none;
    user-select: none;*/
}

<div class="editor" contenteditable="true" spellcheck="false">
<p>Some paragraph</p>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Maecenas aliquet nunc non pulvinar luctus. Cras finibus turpis at arcu mollis, nec fermentum mi pretium. Aliquam suscipit lacus sapien, eu fringilla enim malesuada quis. Sed ut tincidunt erat. In posuere vulputate venenatis. Mauris quis porta magna. Phasellus pharetra in nisl et luctus. Etiam in ultrices risus. Morbi vel dapibus ex. Suspendisse gravida libero non malesuada congue. Pellentesque ut nunc diam.</p>
<p>&nbsp;</p>
<p>&nbsp;</p>
<p>&nbsp;</p>

</div> 

问题是，如果段落稍微长一点，文本的其余部分将在我的计数器伪元素下面。我想拉伸：在计数器之前与段落的高度相同。

我尝试在段落上使用position:relative，在p：xazxswpoi上使用伪序元素，如下所示：position:absolute; height:100%

这在我的情况下不起作用，因为我不希望p：before元素覆盖并覆盖段落，我只想要与现在相同的行为，只是希望How can the pseudo element detect the height of the non-pseudo element?元素在与主p:before相同的高度拉伸。

我也不希望线条伸展超过包装容器的宽度。我一直在尝试很多方法，但未能找到解决方案。

Answer 1

而不是p使用height为p和position:relative之前

absolute

在css中添加了新属性

Js Fiddle

编辑

这应该是第二个问题：D

在

.editor p {
    position:relative;
    padding-left:3.5em;
}

.editor p:before {
    position:absolute;
    top:0;
    bottom:0;
    left:0;
 }

中按enter不会创建Ie而在现代浏览器中它使用br创建br修复问题，以便:after标记不会保持为空

p

Js Fiddle

.editor {
  display: inline-block;
  border: 1px black solid;
  font-family: "Consolas", "Monaco", "Courier New", monospace;
  counter-reset: line;
  width: 90%;
  height: 350px;
  overflow: scroll;
  padding-left: 0;
  margin-left: 0;
  z-index: 1;
}
.editor p {
  display: block;
  counter-increment: line;
  background-color: #FFF;
  text-align: left;
  margin: 0px;
  z-index: 2;
  outline: none;
  position: relative;
  padding-left: 3.5em;
}
.editor p:before {
  display: inline-block;
  width: 2em;
  height: 100%;
  border-right: 1px black solid;
  padding-right: 1em;
  margin-right: 1em;
  content: counter(line);
  color: #FFF;
  background-color: #006;
  text-align: right;
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  /*-webkit-user-select: none;
    user-select: none;*/
}
.editor p:after {
  content: " "
}

Answer 2

由于您希望行号和行以类似于表格的方式显示，因此自然的方法是使它们成为表：将可编辑区域声明为表（在CSS意义上），使行成行，并使生成的行号表格单元格：

<div class="editor" contenteditable="true" spellcheck="false">
  <p>Some paragraph</p>
  <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Maecenas aliquet nunc non pulvinar luctus. Cras finibus turpis at arcu mollis, nec fermentum mi pretium. Aliquam suscipit lacus sapien, eu fringilla enim malesuada quis. Sed ut tincidunt erat.
    In posuere vulputate venenatis. Mauris quis porta magna. Phasellus pharetra in nisl et luctus. Etiam in ultrices risus. Morbi vel dapibus ex. Suspendisse gravida libero non malesuada congue. Pellentesque ut nunc diam.</p>
  <p>one</p>
  <p>two</p>
  <p>three</p>
</div>

.editor {
	display: tablek;
    border: 1px black solid;
    font-family: "Consolas", "Monaco", "Courier New", monospace;
    counter-reset: line;
	
	width:90%;
	height:350px;
	overflow:scroll;
	padding-left:0;
	margin-left:0;
	z-index:1;
	
}
.editor p {
	display: table-row;
    counter-increment: line;
	background-color:#FFF;
	text-align:left;
	margin:0px;
	z-index:2;
	outline: none;
	
}
.editor p:before {
	display: table-cell;
    width:2em;
	height:100%;
    border-right: 1px black solid;
    padding-right: 1em;
    margin-right: 1em;
    content: counter(line);
	color:#FFF;
	background-color:#006;
	text-align:right;
	
	/*-webkit-user-select: none;
    user-select: none;*/
}

Answer 3

<div class="editor" contenteditable="true" spellcheck="false">
<p>Some paragraph</p>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Maecenas aliquet nunc non pulvinar luctus. Cras finibus turpis at arcu mollis, nec fermentum mi pretium. Aliquam suscipit lacus sapien, eu fringilla enim malesuada quis. Sed ut tincidunt erat. In posuere vulputate venenatis. Mauris quis porta magna. Phasellus pharetra in nisl et luctus. Etiam in ultrices risus. Morbi vel dapibus ex. Suspendisse gravida libero non malesuada congue. Pellentesque ut nunc diam.</p>
<p>&nbsp;</p>
<p>&nbsp;</p>
<p>&nbsp;</p>
</div> 

http://jsfiddle.net/zppb29jw/2/

你觉得可以吗？

Answer 4

p {
    position:relative;
    left: 4em;
    ...

p:before {
    position:absolute;
    right:100%
    display:block;
    ...