javascript - 图像在父行中垂直居中

Question

我正在尝试将图像在父流体容器内垂直居中。

Here is a fiddle that outlines the problem.

  <div class="container-fluid">
    <div class="row">
      <div class="col-md-2 col-sm-4 col-xs-4 col-xxs-4">
        <div class="">
          <a href="#"><img id="logo" class="img-responsive" src="https://encrypted-tbn3.gstatic.com/images?q=tbn:ANd9GcRnfIk3IX1dY-okcqPH5BX_L0XF2z31qwP-MD0nijTdAGc2alNc4Q" style="vertical-align: middle;" alt="logo here"/></a>
        </div>
      </div>
      <div class="col-md-10 col-sm-8 col-xs-8 col-xxs-8">
        <div class="row">
          <div class="col-md-12">
            <div class="">
              <nav class="navbar navbar-default" role="navigation">
                <div class="navbar-header">
                  <button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#example-navbar-collapse">
                    <span class="sr-only">Toggle navigation</span>
                    <span class="icon-bar"></span>
                    <span class="icon-bar"></span>
                    <span class="icon-bar"></span>
                  </button>
                </div>
                <div class="collapse navbar-collapse" id="example-navbar-collapse">
                  <ul class="nav navbar-nav navbar-right">
                    <li><a href="#" style="color: #1B75BB;">Search</a>
                    </li>
                    <li><a href="#" style="color: #1B75BB;">Archives</a>
                    </li>
                    <li><a href="#" style="color: #1B75BB;">About</a>
                    </li>
                  </ul>
                </div>
              </nav>
            </div>
          </div>
        </div>
          </div>
        </div>
      </div>

如您所见，图像水平居中，但垂直居中。做诸如设置边距之类的事情，即使是父容器的边距，似乎也不起作用。这感觉应该很容易解决，但我正在努力解决。

Answer 1

有两种方法可以使元素在其他元素中垂直居中，这两种方法都取决于父容器的样式。一种是设置行高与容器高度相同，另一种是使用表格单元格:

img {
  height: 25px;
  width: 25px:
}
.container {
  height: 50px;
  width: 50px;  
  text-align: center;
  border:1px solid;
}
.one {
  line-height: 50px; /* Same as container height */
}
.container.two {
  display:table-cell;
  vertical-align:middle;
}

<div class="container one">
  <a href="#">
    <img class="img-responsive" src="https://encrypted-tbn3.gstatic.com/images?q=tbn:ANd9GcRnfIk3IX1dY-okcqPH5BX_L0XF2z31qwP-MD0nijTdAGc2alNc4Q" style="vertical-align: middle;" alt="logo here" />
  </a>
</div>
<br />
<div class="container two">
  <a href="#">
    <img class="img-responsive" src="https://encrypted-tbn3.gstatic.com/images?q=tbn:ANd9GcRnfIk3IX1dY-okcqPH5BX_L0XF2z31qwP-MD0nijTdAGc2alNc4Q" style="vertical-align: middle;" alt="logo here" />
  </a>
</div>