列数：自动 CSS 不扩展/缩放宽度答案

【问题标题】：column-count: auto css not expanding/scaling width列数：自动 CSS 不扩展/缩放宽度
【发布时间】：2021-02-01 06:08:02
【问题描述】：

我正在尝试在菜单悬停时创建多列子菜单。

为了实现这一点，我使用了 column-count: auto; ，列宽：150px；和列填充：自动；高度固定。

但拆分列的宽度没有扩大。在示例中，白色背景不根据自动列宽进行缩放。当我使用列数时：2；由于硬编码整数工作正常，但我不想使用硬编码整数，它是基于高度的多列。

这里是小提琴链接https://jsfiddle.net/1cga0jro/2/

为什么这不扩大宽度，任何帮助，任何建议？

HTML：

.nav {
  background: brown;
  /*@media only screen and (max-width: 1087px) {
    display: none;
  }*/
}

.nav ul.main_navigation {
  list-style: none;
  margin: 0;
  max-width: 1204px;
  position: relative;
}

.nav ul.main_navigation a {
  text-decoration: none;
}

.nav ul.main_navigation .sub_menu {
  list-style: none;
  padding: 0;
}

.nav ul.main_navigation .sub_menu li {
  font-size: 15px;
  font-weight: bold;
  line-height: 16px;
  letter-spacing: 0.3px;
  max-width: 213px;
}

.nav ul.main_navigation .sub_menu li .sub_menu {
  list-style: none;
  padding: 5px 0 18px;
}

.nav ul.main_navigation .sub_menu li .sub_menu a {
  font-size: 12px;
  line-height: 15px;
  font-weight: normal;
  color: #000;
  padding-bottom: 5px;
  display: block;
}

.nav ul.main_navigation>li {
  display: inline-block;
  font-size: 16px;
  font-weight: bold;
  line-height: normal;
  letter-spacing: 0.4px;
  padding: 30px 10px;
  margin: 0 5px;
}

.nav ul.main_navigation>li>a {
  color: #fff;
}

/*.nav ul.main_navigation>li>.main_sub_menu {
  display: none;
}*/

.nav ul.main_navigation>li:hover {
  background: #ededed;
}

.nav ul.main_navigation>li:hover>a {
  color: #000;
}

.nav ul.main_navigation>li:hover .main_sub_menu {
  display: block;
}

.nav ul.main_navigation>li>.main_sub_menu {
  position: absolute;
  top: 81px;
  list-style: none;
  max-width: 999px;
  padding: 0;
  background: #ededed;
  z-index: 9;
}

.nav ul.main_navigation>li>.main_sub_menu .grid {
  padding: 20px;
  display: -webkit-box;
  display: -webkit-flex;
  display: -ms-flexbox;
  display: flex;
  max-height: 250px;
}


.column-auto {
  -webkit-column-count: auto;
  -moz-column-count: auto;
  column-count: auto;
  -webkit-column-fill: auto;
  -moz-column-fill: auto;
  column-fill: auto;
  -webkit-column-width: 150px;
  -moz-column-width: 150px;
  column-width: 150px;

}

.nav ul.main_navigation>li>.main_sub_menu .grid .column:last-child {
  margin-right: 0;
}

.nav ul.main_navigation>li>.main_sub_menu .grid .col-1,
.nav ul.main_navigation>li>.main_sub_menu .grid .col-2,
.nav ul.main_navigation>li>.main_sub_menu .grid .col-3 {
  padding: 10px 10px 0;
  background: #fff;
  border-radius: 5px;
  margin-right: 10px;
}

.center {
  left: 50%;
  -webkit-transform: translateX(-50%);
  -ms-transform: translateX(-50%);
  transform: translateX(-50%);
}

<!DOCTYPE html>
<html>

  <head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>        
  </head>

  <body>

    <div class="nav">
      <ul class="main_navigation">
        <li><span href="">PRODUCT</span>
          <ul class="main_sub_menu sub_menu">
            <div class="grid">
              <div class="column col-1">
                <li><span>Mobile</span>
                  <ul class="sub_menu">
                    <li><a href="">Mobile 1</a></li>
                    <li><a href="">Mobile 2</a></li>
                    <li><a href="">Mobile 3</a></li>
                  </ul>
                </li>
              </div>

              <div class="column col-2 column-auto">

                <li><span>Mobile</span>
                  <ul class="sub_menu">
                    <li><a href="">Mobile 1</a></li>
                    <li><a href="">Mobile 2</a></li>
                    <li><a href="">Mobile 3</a></li>
                  </ul>
                </li>

                <li><span>Mobile</span>
                  <ul class="sub_menu">
                    <li><a href="">Mobile 1</a></li>
                    <li><a href="">Mobile 2</a></li>
                    <li><a href="">Mobile 3</a></li>
                  </ul>
                </li>

                <li><span>Mobile</span>
                  <ul class="sub_menu">
                    <li><a href="">Mobile 1</a></li>
                    <li><a href="">Mobile 2</a></li>
                    <li><a href="">Mobile 3</a></li>
                  </ul>
                </li>
              </div>

            </div>
          </ul>
        </li>
      </ul>
    </div>
  </body>

</html>

实际结果：

预期结果：

【问题讨论】：

你是div，就在ul之后，你不应该那样做。
@MaxiGui 我尝试将div 更改为ul 和li 但仍然存在问题....这是小提琴jsfiddle.net/1cga0jro/3

标签： html jquery css sass less

【解决方案1】：

因为包裹column-auto 的div 没有足够的宽度。所以它找不到自动创建列的宽度。

See the width of .sub_menu

我刚刚添加了这些行。这按预期工作。

.main_sub_menu,
.column-auto{
  width: 100%; /* or you can use static width */
}

.main_sub_menu {
  left: 0;
}

/* added start */
.main_sub_menu,
.column-auto{
  width: 100%;
}

.main_sub_menu {
  left: 0;
}
/* added end */

.nav {
  background: brown;
  /*@media only screen and (max-width: 1087px) {
    display: none;
  }*/
}

.nav ul.main_navigation {
  list-style: none;
  margin: 0;
  max-width: 1204px;
  position: relative;
}

.nav ul.main_navigation a {
  text-decoration: none;
}

.nav ul.main_navigation .sub_menu {
  list-style: none;
  padding: 0;
}

.nav ul.main_navigation .sub_menu li {
  font-size: 15px;
  font-weight: bold;
  line-height: 16px;
  letter-spacing: 0.3px;
  max-width: 213px;
}

.nav ul.main_navigation .sub_menu li .sub_menu {
  list-style: none;
  padding: 5px 0 18px;
}

.nav ul.main_navigation .sub_menu li .sub_menu a {
  font-size: 12px;
  line-height: 15px;
  font-weight: normal;
  color: #000;
  padding-bottom: 5px;
  display: block;
}

.nav ul.main_navigation>li {
  display: inline-block;
  font-size: 16px;
  font-weight: bold;
  line-height: normal;
  letter-spacing: 0.4px;
  padding: 30px 10px;
  margin: 0 5px;
}

.nav ul.main_navigation>li>a {
  color: #fff;
}


/*.nav ul.main_navigation>li>.main_sub_menu {
  display: none;
}*/

.nav ul.main_navigation>li:hover {
  background: #ededed;
}

.nav ul.main_navigation>li:hover>a {
  color: #000;
}

.nav ul.main_navigation>li:hover .main_sub_menu {
  display: block;
}

.nav ul.main_navigation>li>.main_sub_menu {
  position: absolute;
  top: 81px;
  list-style: none;
  max-width: 999px;
  padding: 0;
  background: #ededed;
  z-index: 9;
}

.nav ul.main_navigation>li>.main_sub_menu .grid {
  padding: 20px;
  display: -webkit-box;
  display: -webkit-flex;
  display: -ms-flexbox;
  display: flex;
  max-height: 250px;
}

.column-auto {
  -webkit-column-width: 150px;
  -moz-column-width: 150px;
  column-width: 150px;
}

.nav ul.main_navigation>li>.main_sub_menu .grid .column:last-child {
  margin-right: 0;
}

.nav ul.main_navigation>li>.main_sub_menu .grid .col-1,
.nav ul.main_navigation>li>.main_sub_menu .grid .col-2,
.nav ul.main_navigation>li>.main_sub_menu .grid .col-3 {
  padding: 10px 10px 0;
  background: #fff;
  border-radius: 5px;
  margin-right: 10px;
}

.center {
  left: 50%;
  -webkit-transform: translateX(-50%);
  -ms-transform: translateX(-50%);
  transform: translateX(-50%);
}

<!DOCTYPE html>
<html>

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
</head>

<body>

  <div class="nav">
    <ul class="main_navigation">
      <li><span href="">PRODUCT</span>
        <ul class="main_sub_menu sub_menu">
          <div class="grid">
            <div class="column col-1">
              <li><span>Mobile</span>
                <ul class="sub_menu">
                  <li><a href="">Mobile 1</a></li>
                  <li><a href="">Mobile 2</a></li>
                  <li><a href="">Mobile 3</a></li>
                </ul>
              </li>
            </div>

            <div class="column col-2 column-auto">

              <li><span>Mobile</span>
                <ul class="sub_menu">
                  <li><a href="">Mobile 1</a></li>
                  <li><a href="">Mobile 2</a></li>
                  <li><a href="">Mobile 3</a></li>
                </ul>
              </li>

              <li><span>Mobile</span>
                <ul class="sub_menu">
                  <li><a href="">Mobile 1</a></li>
                  <li><a href="">Mobile 2</a></li>
                  <li><a href="">Mobile 3</a></li>
                </ul>
              </li>

              <li><span>Mobile</span>
                <ul class="sub_menu">
                  <li><a href="">Mobile 1</a></li>
                  <li><a href="">Mobile 2</a></li>
                  <li><a href="">Mobile 3</a></li>
                </ul>
              </li>
            </div>

          </div>
        </ul>
      </li>
    </ul>
  </div>
</body>

</html>

【讨论】：

在移动垂直视图上不起作用...codepen.io/Maxigui/pen/eYzgXNY
@MaxiGui 因为您使用的是max-height: 250px。看看这个i.stack.imgur.com/v6Wqu.png
在上面的 codepen 中，我只是复制了你的代码，所以我没有使用任何东西。我只是指出在移动垂直上它不起作用的事实。（我不是问这个问题的人）

【解决方案2】：

我不确定您是否可以像现在这样实现目标，我为您提供以下解决方案。我在你的 CSS 底部添加了一些 CSS，并在 .grid 中评论/添加了一些。我还删除了column-auto 类。这个想法是使用 flexbox。

演示：

.nav {
  background: brown;
  /*@media only screen and (max-width: 1087px) {
    display: none;
  }*/
}

.nav ul.main_navigation {
  list-style: none;
  margin: 0;
  max-width: 1204px;
  position: relative;
}

.nav ul.main_navigation a {
  text-decoration: none;
}

.nav ul.main_navigation .sub_menu {
  list-style: none;
  padding: 0;
}

.nav ul.main_navigation .sub_menu li {
  font-size: 15px;
  font-weight: bold;
  line-height: 16px;
  letter-spacing: 0.3px;
  max-width: 213px;
}

.nav ul.main_navigation .sub_menu li .sub_menu {
  list-style: none;
  padding: 5px 0 18px;
}

.nav ul.main_navigation .sub_menu li .sub_menu a {
  font-size: 12px;
  line-height: 15px;
  font-weight: normal;
  color: #000;
  padding-bottom: 5px;
  display: block;
}

.nav ul.main_navigation>li {
  display: inline-block;
  font-size: 16px;
  font-weight: bold;
  line-height: normal;
  letter-spacing: 0.4px;
  padding: 30px 10px;
  margin: 0 5px;
}

.nav ul.main_navigation>li>a {
  color: #fff;
}

/*.nav ul.main_navigation>li>.main_sub_menu {
  display: none;
}*/

.nav ul.main_navigation>li:hover {
  background: #ededed;
}

.nav ul.main_navigation>li:hover>a {
  color: #000;
}

.nav ul.main_navigation>li:hover .main_sub_menu {
  display: block;
}

.nav ul.main_navigation>li>.main_sub_menu {
  position: absolute;
  top: 81px;
  list-style: none;
  max-width: 999px;
  padding: 0;
  background: #ededed;
  z-index: 9;
}

.nav ul.main_navigation>li>.main_sub_menu .grid {
/*  padding: 20px;*/      /*** COMMENTED***/
  display: -webkit-box;
  display: -webkit-flex;
  display: -ms-flexbox;
  display: flex;
  max-height: 250px;
  max-width: unset; /** ADDED **/
}


.column-auto {
  -webkit-column-count: auto;
  -moz-column-count: auto;
  column-count: auto;
  -webkit-column-fill: auto;
  -moz-column-fill: auto;
  column-fill: auto;
  -webkit-column-width: 150px;
  -moz-column-width: 150px;
  column-width: 150px;

}

.nav ul.main_navigation>li>.main_sub_menu .grid .column:last-child {
  margin-right: 0;
}

.nav ul.main_navigation>li>.main_sub_menu .grid .col-1,
.nav ul.main_navigation>li>.main_sub_menu .grid .col-2,
.nav ul.main_navigation>li>.main_sub_menu .grid .col-3 {
  padding: 10px 10px 0;
  background: #fff;
  border-radius: 5px;
  /*margin-right: 10px;*/
}




.center {
  left: 50%;
  -webkit-transform: translateX(-50%);
  -ms-transform: translateX(-50%);
  transform: translateX(-50%);
}

/***************** CSS ADDED *****************/
.col-1, .col-2{
  border: 20px solid #ededed;
}
li .col-1{
  border-right: none;
}
.col-2{
  display: flex;
  flex-wrap: wrap;
  flex-direction: column;
  max-height: 100%;
  min-width: -webkit-fill-available;
  min-width: -moz-available;
}

.col-2 li{
  display:block;
  margin-left: 5px;
  margin-right: 5px;
}

<!DOCTYPE html>
<html>

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
  <link href="menu.css" rel="stylesheet">
</head>

<body>

<div class="nav">
  <ul class="main_navigation">
    <li><span href="">PRODUCT</span>
      <ul class="main_sub_menu sub_menu">
        <li class="grid">
          <ul class="column col-1">
            <li><span>Mobile</span>
              <ul class="sub_menu">
                <li><a href="">Mobile 1</a></li>
                <li><a href="">Mobile 2</a></li>
                <li><a href="">Mobile 3</a></li>
              </ul>
            </li>
          </ul>

          <ul class="column col-2">

            <li><span>Mobile</span>
              <ul class="sub_menu">
                <li><a href="">Mobile 1</a></li>
                <li><a href="">Mobile 2</a></li>
                <li><a href="">Mobile 3</a></li>
              </ul>
            </li>

            <li><span>Mobile</span>
              <ul class="sub_menu">
                <li><a href="">Mobile 1</a></li>
                <li><a href="">Mobile 2</a></li>
                <li><a href="">Mobile 3</a></li>
              </ul>
            </li>

            <li><span>Mobile</span>
              <ul class="sub_menu">
                <li><a href="">Mobile 1</a></li>
                <li><a href="">Mobile 2</a></li>
                <li><a href="">Mobile 3</a></li>
              </ul>
            </li>
          </ul>

        </li>
      </ul>
    </li>
    <li><span href="">ITEMS</span>
      

    </li>
  </ul>
</div>
</body>

</html>

【讨论】：

之前我尝试过这个解决方案，但 flex-direction: column; 在 Firefox 上无法正常工作。一旦列中断，它就不会像column-count: auto;那样扩展宽度
@Kango 它在 mozilla 上崩溃了，因为，您需要设置 min-width: -moz-available; 现在再试一次。它也可以在 Safari 上正常运行

【解决方案3】：

您可以使用显示网格来实现所需的布局。

.column-auto {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-column-gap: 20px;
}

这将为您提供所需的布局。

这是一个工作示例。 https://jsfiddle.net/42r5wax6/

【讨论】：