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        悬停一个元素,然后更改另一个元素(不使用 Javascript)

        时间:2023-11-29

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                  本文介绍了悬停一个元素,然后更改另一个元素(不使用 Javascript)的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着跟版网的小编来一起学习吧!

                  问题描述

                  我有一个嵌套的 CSS 菜单,我无法显示子菜单.

                  I have a nested CSS menu that I can't get the submenus to come up.

                  我从 一个列表分开获取代码.该站点上的示例运行良好,但由于我的页面上有 2 个 CSS 导航菜单,我必须将我的 HTML 元素放在不同的 CSS 类中.

                  I took the code from A list apart. The example on that site works perfectly fine, but since I have 2 CSS navigational menus on my page, I have to put my HTML elements in different CSS classes.

                  这是我的代码:

                  <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" 
                  
                  "http://www.w3.org/TR/html4/strict.dtd">
                  <html>
                  <head>
                    <style type="text/css">
                      ul#lvl1 {
                          margin:0;
                          padding:0;
                          list-style:none;
                          width:150px; /* Width of Menu Items */
                          border-bottom:1px solid #ccc;
                      }
                      li.lvl1 {position:relative}
                      ul.lvl2 {
                          position: absolute;
                          left: 149px; /* Set 1px less than menu width */
                          top: 0;
                          display: none;
                      }
                      /* Styles for Menu Items */
                      li.lvl1 > a {
                        display: block;
                          text-decoration: none;
                          color: #777;
                          background: #fff; /* IE6 Bug */
                          padding: 5px;
                          border: 1px solid #ccc;
                          border-bottom: 0;
                      }
                      /* Fix IE. Hide from IE Mac */
                      *  html.lvl1 > ul > li {float:left;height:1%}
                      *  html.lvl1 > ul > li > a {height:1%}
                      /* End */
                      li.lvl2 > a:hover { color: #E2144A; background: #f9f9f9; } /* Hover Styles */
                      li.lvl2 > a { padding: 2px 5px; } /* Sub Menu Styles */
                      a.lvl1:hover ul.lvl2 {display: block} /* The magic */
                    </style>
                  </head>
                  <body>
                    <ul id="lvl1">
                      <li class="lvl1">
                        <a class="lvl1" href="#">item1</a>
                        <ul class="lvl2">
                          <li class="lvl2">
                            <a class="lvl2" href="#">subitem1</a>
                          </li>
                        </ul>
                      </li>
                      <li class="lvl1">
                        <a class="lvl1" href="#">item2</a>
                        <ul class="lvl2">
                          <li class="lvl2">
                            <a class="lvl2" href="#">subitem2</a>
                          </li>
                        </ul>
                      </li>
                    </ul>
                  </body>
                  </html>
                  

                  现在,当我将鼠标悬停在 1 级的a"上时,2 级的ul"不会出现.有人可以阐明一下吗?我可能遗漏了一些明显的东西.谢谢!

                  Now when I hover over the "a" on level 1, the "ul" on level 2 won't come up. Can someone please shed some light? I may be missing something obvious. Thanks!

                  推荐答案

                  你必须改变你的 CSS 选择器来定位 lvl2 <ul>,因为它不再嵌套(它是一个兄弟,所以使用 +).

                  You must change your CSS selector to target the lvl2 <ul>, since it is not nested anymore (it's a sibling, so use +).

                  a.lvl1:hover + ul.lvl2 {display: block} /* The magic */
                  

                  你应该阅读这个css 选择器列表.

                  或者您可以将鼠标悬停在 lvl1 <li> 上,而不是锚点

                  Or you could move the hover on the lvl1 <li>, instead of the anchor

                  li.lvl1:hover ul.lvl2 {display: block} /* The magic */
                  

                  这篇关于悬停一个元素,然后更改另一个元素(不使用 Javascript)的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持跟版网!

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