Ul li 用":before"制成的项目符号 - 如何缩进第 2 行文本

Question

我有一个多达四个子级别的列表。子弹是用:制成的。我在使第二行文本与第一行文本对齐时遇到了一些麻烦。

我试过这样设置填充和文本缩进:

ul {
  padding-left: 1em;
  text-indent: -1em;
}

-但它不起作用。设置list-style-position: outside似乎也不起作用。

JSFIDDLE这里

任何想法?

Answer 1

最好使用position: absolute而不是float来对齐子弹。

.menu {
  width: 250px;
}
ul.nav>li>a {
  position: relative;
}
/* First level */
ul.nav>li>a:before {
  position: absolute;
  font-family: 'Glyphicons Halflings';
  font-size: 7px;
  color: #901a1e;
  content: "e080";
  border: 1px solid #d7d7d7;
  left: 0;
  top: 13px;
}
/* Sub levels */
ul.nav>li ul li>a {
  display: inline-block;
  vertical-align: top;
  padding-left: 10px;
  position: relative;
}
ul.nav>li ul li>a:before {
  position: absolute;
  font-size: 9px;
  color: #901a1e;
  content: "25A0";
  left: 0;
  top: 3px;
}
ul li {
  list-style-type: none;
}

<link href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.7/css/bootstrap.css" rel="stylesheet"/>
<div class="menu">
  <ul class="nav">
    <li><a href="#">Home</a></li>
    <li><a href="#">Sub menu here</a>
      <ul>
        <li><a href="#">Link 2.1 - one more very, very, very, long text</a></li>
        <li class="active"><a href="#">Link 2.2 - active</a></li>
        <li><a href="#">Link 2.3</a></li>
      </ul>
    </li>
    <li><a href="#">Separated link</a>
    </li>
    <li><a href="#">Separated link</a>
      <ul>
        <li><a href="#">Link 2.1</a>
          <ul>
            <li><a href="#">Link 3.1</a></li>
            <li><a href="#">Link 3.2</a></li>
            <li><a href="#">Link 3.3</a>
              <ul>
                <li><a href="#">Link 4.1 - one more very, very, very, long text</a></li>
                <li><a href="#">Link 4.2</a></li>
                <li><a href="#">Link 4.3</a></li>
              </ul>
            </li>
          </ul>
        </li>
      </ul>
    </li>
    <li><a href="#">One more very, very, very, long separated link</a></li>
    <li><a href="#">One more separated link</a></li>
  </ul>
</div>

Answer 2

在:before和a元素上使用相同的line-height

参见代码片段:

.menu {
    width: 250px;
}
/* First level */
ul.nav>li>a:before {
    float: left;
    margin: 3px 6px 4px 0;
    font-family: 'Glyphicons Halflings';
    font-size: 7px;
    color: #901a1e;
    content: "e080";
    border: 1px solid #d7d7d7;
   
}
/* Sub levels */
ul.nav>li ul li>a:before {
    float: left;
    margin-right: 6px;
    font-size: 9px;
    color: #901a1e;
    content: "25A0";
    line-height:16px;
}
ul li {
    list-style-type: none;
}
ul li a {
  line-height:16px;
}

<div class="menu">
    <ul class="nav">
        <li><a href="#">Home</a></li>
        <li><a href="#">Sub menu here</a>
            <ul>
                <li><a href="#">Link 2.1 - one more very, very, very, long text</a></li>
                <li class="active"><a href="#">Link 2.2 - active</a></li>
                <li><a href="#">Link 2.3</a></li>
            </ul>
        </li>
        <li><a href="#">Separated link</a>
        </li>
        <li><a href="#">Separated link</a>
            <ul>
                <li><a href="#">Link 2.1</a>
                    <ul>
                        <li><a href="#">Link 3.1</a></li>
                        <li><a href="#">Link 3.2</a></li>
                        <li><a href="#">Link 3.3</a>
                            <ul>
                                <li><a href="#">Link 4.1 - one more very, very, very, long text</a></li>
                                <li><a href="#">Link 4.2</a></li>
                                <li><a href="#">Link 4.3</a></li>
                            </ul>
                        </li>
                    </ul>
                </li>
            </ul>
        </li>
        <li><a href="#">One more very, very, very, long separated link</a></li>
        <li><a href="#">One more separated link</a></li>
    </ul>
</div>

Answer 3

下面的代码应该可以工作:

.menu {
    width: 250px;
}
ul{
  list-style:none;
}
/* Setting the position of <a> and a:before*/
ul.nav li a{
  position:relative; /* Setting this to relative so that we position a:before absolute to <a> */
  padding-left:10px; /* We are moving the text to right by 10px */
  display:block;
}
ul.nav li a:before{
 position:absolute; /* This is the main css rule which gets our desired result */
 left:-5px; /* setting the left position */
 top:4px;   /* setting the top position */
}
/* Setting Styles of <li> */
ul.nav>li>a:before {
   
    font-family: 'Glyphicons Halflings';
    font-size: 7px;
    color: #901a1e;
    content: "e080";
    border: 1px solid #d7d7d7;
}
ul.nav>li ul li>a:before {
    font-size: 9px;
    color: #901a1e;
    content: "25A0";
}

<div class="menu">
    <ul class="nav">
        <li><a href="#">Home</a></li>
        <li><a href="#">Sub menu here</a>
            <ul>
                <li><a href="#">Link 2.1 - one more very, very, very, long text</a></li>
                <li class="active"><a href="#">Link 2.2 - active</a></li>
                <li><a href="#">Link 2.3</a></li>
            </ul>
        </li>
        <li><a href="#">Separated link</a>
        </li>
        <li><a href="#">Separated link</a>
            <ul>
                <li><a href="#">Link 2.1</a>
                    <ul>
                        <li><a href="#">Link 3.1</a></li>
                        <li><a href="#">Link 3.2</a></li>
                        <li><a href="#">Link 3.3</a>
                            <ul>
                                <li><a href="#">Link 4.1 - one more very, very, very, long text</a></li>
                                <li><a href="#">Link 4.2</a></li>
                                <li><a href="#">Link 4.3</a></li>
                            </ul>
                        </li>
                    </ul>
                </li>
            </ul>
        </li>
        <li><a href="#">One more very, very, very, long separated link</a></li>
        <li><a href="#">One more separated link</a></li>
    </ul>
</div>