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javascript - CSS Grid - 突出显示单元格直到悬停的单元格

问题描述

在网格中，我想突出显示一组单元格 - 一个矩形 - 从左上角单元格开始到鼠标位置下方的单元格。

假设我们的网格最初看起来像这样：

.grid {
  display: grid;
  grid-template-columns: repeat(5, 50px);
  grid-template-rows: repeat(5, 50px);
  gap: 5px;
}

.grid-item {
  display: flex;
  justify-content: center;
  align-items: center;
  background: lightgray;
}
<div class="grid">
    <div class="grid-item">1</div>
    <div class="grid-item">2</div>
    <div class="grid-item">3</div>
    <div class="grid-item">4</div>
    <div class="grid-item">5</div>
    <div class="grid-item">6</div>
    <div class="grid-item">7</div>
    <div class="grid-item">8</div>
    <div class="grid-item">9</div>
    <div class="grid-item">10</div>
    <div class="grid-item">11</div>
    <div class="grid-item">12</div>
    <div class="grid-item">13</div>
    <div class="grid-item">14</div>
    <div class="grid-item">15</div>
    <div class="grid-item">16</div>
    <div class="grid-item">17</div>
    <div class="grid-item">18</div>
    <div class="grid-item">19</div>
    <div class="grid-item">20</div>
    <div class="grid-item">21</div>
    <div class="grid-item">22</div>
    <div class="grid-item">23</div>
    <div class="grid-item">24</div>
    <div class="grid-item">25</div>
</div>

现在用户将鼠标悬停在 18 号单元格上。现在网格应该如下所示：

.grid {
  display: grid;
  grid-template-columns: repeat(5, 50px);
  grid-template-rows: repeat(5, 50px);
  gap: 5px;
}

.grid-item {
  display: flex;
  justify-content: center;
  align-items: center;
  background: lightgray;
}

.grid-item-blue {
  background: lightblue;
}
<div class="grid">
    <div class="grid-item grid-item-blue">1</div>
    <div class="grid-item grid-item-blue">2</div>
    <div class="grid-item grid-item-blue">3</div>
    <div class="grid-item">4</div>
    <div class="grid-item">5</div>
    <div class="grid-item grid-item-blue">6</div>
    <div class="grid-item grid-item-blue">7</div>
    <div class="grid-item grid-item-blue">8</div>
    <div class="grid-item">9</div>
    <div class="grid-item">10</div>
    <div class="grid-item grid-item-blue">11</div>
    <div class="grid-item grid-item-blue">12</div>
    <div class="grid-item grid-item-blue">13</div>
    <div class="grid-item">14</div>
    <div class="grid-item">15</div>
    <div class="grid-item grid-item-blue">16</div>
    <div class="grid-item grid-item-blue">17</div>
    <div class="grid-item grid-item-blue">18</div>
    <div class="grid-item">19</div>
    <div class="grid-item">20</div>
    <div class="grid-item">21</div>
    <div class="grid-item">22</div>
    <div class="grid-item">23</div>
    <div class="grid-item">24</div>
    <div class="grid-item">25</div>
</div>

我更喜欢css解决方案。是否可以仅使用css？如果没有，您将如何在 JS 中执行此操作？

标签： javascriptcsscss-grid

解决方案

这是带有 flexbox 但过于复杂的纯 CSS 解决方案。

.grid {
  display: flex;
  flex-wrap: wrap;
  flex-flow: wrap-reverse;
  direction: rtl;
  width: calc(50px*5 + 5px*4);
}

.grid-item {
  width: 50px;
  height: 50px;
  display: flex;
  justify-content: center;
  align-items: center;
  background: lightgray;
  margin-bottom: 5px;
}

.grid-item:not(:nth-child(5n + 1)) {
  margin-right: 5px;
}

.grid-item:nth-child(5n - 4):hover,
.grid-item:nth-child(5n - 4):hover~.grid-item,
.grid-item:nth-child(5n - 3):hover,
.grid-item:nth-child(5n - 3):hover~.grid-item:not(:nth-child(5n + 1)),
.grid-item:nth-child(5n - 2):hover,
.grid-item:nth-child(5n - 2):hover~.grid-item:not(:nth-child(5n + 1)):not(:nth-child(5n + 2)),
.grid-item:nth-child(5n - 1):hover,
.grid-item:nth-child(5n - 1):hover~.grid-item:not(:nth-child(5n + 1)):not(:nth-child(5n + 2)):not(:nth-child(5n + 3)),
.grid-item:nth-child(5n):hover,
.grid-item:nth-child(5n):hover~.grid-item:not(:nth-child(5n + 1)):not(:nth-child(5n + 2)):not(:nth-child(5n + 3)):not(:nth-child(5n + 4))
{
  background: lightblue;
}
<div class="grid">
      <div class="grid-item">25</div>
      <div class="grid-item">24</div>
      <div class="grid-item">23</div>
      <div class="grid-item">22</div>
      <div class="grid-item">21</div>
      <div class="grid-item">20</div>
      <div class="grid-item">19</div>
      <div class="grid-item">18</div>
      <div class="grid-item">17</div>
      <div class="grid-item">16</div>
      <div class="grid-item">15</div>
      <div class="grid-item">14</div>
      <div class="grid-item">13</div>
      <div class="grid-item">12</div>
      <div class="grid-item">11</div>
      <div class="grid-item">10</div>
      <div class="grid-item">9</div>
      <div class="grid-item">8</div>
      <div class="grid-item">7</div>
      <div class="grid-item">6</div>
      <div class="grid-item">5</div>
      <div class="grid-item">4</div>
      <div class="grid-item">3</div>
      <div class="grid-item">2</div>
      <div class="grid-item">1</div>
    </div>

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