如何仅通过鼠标悬停显示菜单？

Question

我正在尝试自定义 horizon 仪表板 (openstack)。在仪表板中有一个 Nov-accordians 菜单（请参见下图），我想隐藏它并仅在鼠标悬停在 菜单区域 上时显示它。这里nav_accordion是cssclass。 请告诉我应该在以下 css 文件中添加什么代码才能达到上述效果。

我只想在将鼠标悬停在上面时显示以下菜单。此菜单位于 top-left。

将鼠标悬停在 菜单区域 菜单上时应该会出现。

以下代码来自 github openstack(icehouse)
accordians_nav.css

@accordionBorderColor: #e5e5e5;
.outline(@outline) {
  outline: @outline;
  -moz-outline-style: @outline;
}

.nav_accordion {
  //N: hide the nav accordion menu
  display:none;
  background-color: #f9f9f9;
  color: #6e6e6e;
  margin: 0px 0px;

  dt, dd {
    padding: 10px 0 10px 0;
    line-height: 18px;

    h4 {
      border: 1px solid #BBBBBB;
      border-right: 0;
      border-bottom: 0;
      background-color: #f0f0f0;
      background-repeat: no-repeat;
      background-position: 96% center;
      background-image: url(/static/dashboard/img/right_droparrow.png);

      padding: 10px 0 10px 0;
      line-height: 16px;
      margin-top: 0;

      color: #6e6e6e;
      font-weight: bold;
      text-rendering: optimizelegibility;
      max-width: 193px;
      padding-right: 16px;
      cursor: pointer;

      div {
        color: #6e6e6e;
        font-size: 14px;
        margin: 0 0 0 14px;
        display: block;
        font-weight: bold;
        .outline(none);
        overflow: hidden;
        text-overflow: ellipsis;
        max-width: 177px;
      }
    }

    h4.active {
      border-bottom: 1px solid #BBBBBB;
      background-image: url(/static/dashboard/img/drop_arrow.png);
    }
// N: This will change in the look of list
    a {
      color: #6e6e6e;
      font-size: 16px;
      margin: 0 0 0 14px;
      padding: 0;
      display: block;
      font-weight: bold;
      .outline(none);
      text-decoration: none;
    }
  // TH
    ul {
      list-style: none outside none;
      margin: 10px 0 0;
      width: 222px;
    }

    // This is list for showing dashboard and panel
    li {
      a {
        width: 185px;
        padding: 10px;
        display: block;
        line-height: 18px;
        margin-left: 20px;
        font-weight: normal;
        font-size: 13px;
      }

      a.active {
        background: #fff;// this will change the color of active panel
        border-top: 2px solid @accordionBorderColor;
        border-left: 4px solid #d93c27;// this will change the color of left side of active panel
        border-bottom: 2px solid @accordionBorderColor;
        margin-left: 18px;// It will shift the panel rightside, so please check all the panel are aligned or not
        .border-radius(5px 0 0 5px);// this will round the corner of panel
        //for more info http://css3pie.com/demos/border-radius/
      }

      a:last-child {
        margin-bottom: 8px;
      }
    }

  }

  dd {
    padding: 0;
    font-size: 12px;
  }

  dt {
    border-top: 1px solid #BBBBBB;
    background-color: @accordionBorderColor;
    background-repeat: no-repeat;
    background-position: 96% center;
    background-image: url(/static/dashboard/img/right_droparrow.png);
    padding-right: 16px;
    max-width: 217px;
    cursor: pointer;

    div {
      color: #6e6e6e;
      font-size: 14px;
      margin: 0 0 0 14px;
      padding: 0;
      font-weight: bold;
      .outline(none);
      overflow: hidden;
      text-overflow: ellipsis;
      max-width: 201px;
    }
  }

  dt.active {
    background-image: url(/static/dashboard/img/drop_arrow.png);
  }

  dt:first-child {
    border-top: 0;
  }

  dt a {
    text-decoration: none;
  }
}

_accordion_nav.html

{% load horizon i18n %}
{% load url from future %}

<div>
  <dl class="nav_accordion">
  {% for dashboard, panel_info in components %}
    {% if user|has_permissions:dashboard %}
      {% if dashboard.supports_tenants and request.user.authorized_tenants or not dashboard.supports_tenants %}
        <dt {% if current.slug == dashboard.slug %}class="active"{% endif %}>
          <div>{{ dashboard.name }}</div>
        </dt>
        {% if current.slug == dashboard.slug %}
        <dd>
        {% else %}
        <dd style="display:none;">
        {% endif %}
        {% for heading, panels in panel_info.iteritems %}
          {% with panels|has_permissions_on_list:user as filtered_panels %}
          {% if filtered_panels %}
            {% if heading %}
            <div><h4><div>{{ heading }}</div></h4>
            {% endif %}
            <ul>
            {% for panel in filtered_panels %}
              <li><a href="{{ panel.get_absolute_url }}" {% if current.slug == dashboard.slug and current_panel == panel.slug %}class="active"{% endif %} >{{ panel.name }}</a></li>
            {% endfor %}
            </ul>
            {% if heading %}
              </div>
            {% endif %}
          {% endif %}
          {% endwith %}
        {% endfor %}
        </dd>
      {% endif %}
    {% endif %}
  {% endfor %}
  </dl>
</div>

Answer 1

所以，您得到的代码缺少实际的操作，这似乎是在 Javascript 中编码的。

你应该使用这个：

.logo:hover .nav_accordion {
    display: block;
}

.logo 选择器应替换为实际徽标 class。

Answer 2

既然你说你希望菜单在你悬停它曾经所在的区域时显示，你应该试试这个。

 .nav_accordion {
    opacity: 0;
 }

 .nav_accordion:hover {
   opacity: 1;
 }

请务必删除您的 display: hidden;，因为悬停不会应用于隐藏元素。

示例：https://jsfiddle.net/qx7c3p72/（将鼠标移动到结果的左上角window）

如何仅通过鼠标悬停显示菜单？

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