隐藏子菜单上的 CSS 计数器 [英] CSS counter on hidden submenu

问题描述

我正在尝试使用嵌套的

制作下拉菜单，每个
• 显示一个由 CSS 计数器生成的数字.

  I'm trying to make a dropdown menu using nested <ul>, every <li> displaying a number generated with CSS Counters.

  子菜单在未悬停时使用 display:none 隐藏.

  Sub-menus are hidden with display:none when not hovered.

  我的问题是当元素将 display 设置为 none 时，计数器不会增加.

  My problem is that counters are not incremented when an element has display set to none.

  您是否知道可以防止这种情况发生的 CSS 属性?

  Do you know a CSS property to prevent this?

  如果我将 display: none 替换为 visibility: hidden，它会起作用，但我不确定在我的菜单中使用它是否很好，是否有任何陷阱?

  If I replace display: none by visibility: hidden, it's working but I'm not sure if it's nice to use this for my menu, are there any traps?

  推荐答案

  您可以通过将 font-size 设置为 0px 来模仿 display: none(隐藏)行为这将使元素被 counter 属性计数.

  You can mimick the display: none (hidden) behavior by setting the font-size to 0px and this would make the element be counted by the counter property.

  .hidden{
      font-size: 0px;
  }
  

  演示

  或者，上述更复杂的版本(由 Hashem Qolami 在评论中提到)

  Or, a bit more complex version of the above (mentioned by Hashem Qolami in comments)

  .hidden{
      font: 0/0 a; 
      visibility: hidden;
  }
  

  演示 2

  注意: visibility: hidden 也可以，但它会在输出中留下相当于一行高度的空间.

  Note: visibility: hidden would also work but it would leave a space equivalent to the height of one line in the output.

  使用可见性属性的演示

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