设置网格行时，CSS Grid不会包装子级

Question

CODEPEN

背景：

我正在尝试使用Grid CSS，并尝试转到当前已实现缩放的布局

预期布局

问题： 在桌面元素，头要宽8列，如果我不网格行添加到element-header与element比<div class="element">1</div>将在未来填补element-header。现在，如果我添加grid-rows了，element将不再包装。

当前布局（问题）

问题 如何修复网格以匹配上面的“预期布局”屏幕截图？即.element将包裹并启动第二网格行

码：

HTML：

<section class="section">
  <div class="container">
    <div class="samba-grid">
      <div class="element-header"><h1>I am a lot of header text that only goes 8 columsn wide</h1></div>
      <div class="element">1</div>
      <div class="element">2</div>
      <div class="element">3</div>
      <div class="element">4</div>     
    </div>
  </div>
</section>

CSS：

.section {
  width: 100%;
  display: block;
  background: red;
  box-sizing: border-box;
  padding: 40px 24px;

  @media screen and (min-width: 600px) and (max-width: 1139px) {
    background: orange;
    padding: 56px 48px;
  }

  @media screen and (min-width: 1140px) {
    padding: 64px 48px;
    background: green;
  }
}

.container {
  margin: 0 auto;
  background: rgba(244,244,244, .25);
  max-width: 599px;

  @media screen and (min-width: 600px) and (max-width: 1139px) {
    max-width: 1039px;
    background: rgba(244,244,244, .25);
  }

  @media screen and (min-width: 1140px) {
    max-width: 1032px;
    background: rgba(244,244,244, .25);
  }
}

.samba-grid {
  display: grid;
  background: inherit;
  width: 100%;
  grid-template-columns: repeat(4, 1fr);
  grid-template-rows: 'auto auto';
  grid-gap: 24px;

  @media screen and (min-width: 600px) and (max-width: 1139px) {
    grid-template-columns: repeat(6, 1fr);
    grid-gap: 48px;
  }

  @media screen and (min-width: 1140px) {
    grid-template-columns: repeat(12, 1fr);
    grid-gap: 48px;
  }
}

h1 {
  font-size: 52px;
}
.element-header {
  grid-row: 1;
  grid-column: span 8; // SET THIS TO "span 12" TO SEE EXPECTED BEHAVIOR
}

.element {
  display: grid; // important to do this.
  background: rgba(0,0,0,.3);
  grid-column: span 3;
  grid-row: 2; // REMOVE THIS TO SEE EXPECTED BEHAVIOR

  @media screen and (min-width: 600px) and (max-width: 1139px) {
    grid-column: span 3;
  }

  @media screen and (min-width: 1140px) {
    grid-column: span 4;
  }
}

Answer 1

您可以使文本占据整行，然后在内部减小其宽度，使其仅占据所需的宽度。这样你就会阻塞第一行，没有元素可以到达那里。

这是一个简化的示例：

.samba-grid {
  display: grid;
  background: inherit;
  width: 100%;
  grid-template-columns: repeat(12, 1fr);
  grid-gap: 24px;
  border:1px solid;
}

.element-header {
  grid-row: 1;
  grid-column: 1/-1;
}
.element-header > h1 {
  /*we take 8 colmuns (without gaps) + 7 gaps*/
  width:calc(8*(100% - 11*24px)/12 + 7*24px);
  background:red;
  margin:0;
}
.samba-grid > span {
  height:50px;
  grid-column: span 2;
  background:green;
}

<div class="samba-grid">
  <div class="element-header">
    <h1>I am a lot of header text that only goes 8 columsn wide</h1>
  </div>
  <span></span>
  <span></span>
  <span></span>
  <span></span>
  <span></span>
  <span></span>
  <span></span>
  <span></span>
</div>

为了使其更加动态且易于处理，您可以考虑 CSS 变量：

:root {
  --grid:12;
  --gap:24px;
}

.samba-grid {
  display: grid;
  background: inherit;
  width: 100%;
  grid-template-columns: repeat(var(--grid), 1fr);
  grid-gap: var(--gap);
  border:1px solid;
}

.element-header {
  grid-row: 1;
  grid-column: 1/-1;
  --grid-column:8; /*simply adjust this value to control the column*/
}
.element-header > h1 {
  width:calc(var(--grid-column)*(100% - (var(--grid) - 1)*var(--gap))/var(--grid) + calc(var(--grid-column) - 1)*var(--gap));
  background:red;
  margin:0;
}
.samba-grid > span {
  height:50px;
  grid-column: span 2;
  background:green;
}

<div class="samba-grid">
  <div class="element-header">
    <h1>I am a lot of header text that only goes 8 columsn wide</h1>
  </div>
  <span></span>
  <span></span>
  <span></span>
  <span></span>
  <span></span>
  <span></span>
  <span></span>
  <span></span>
</div>

另一个想法是考虑一个隐藏元素，该元素将占用第一行的剩余空间：

.samba-grid {
  display: grid;
  background: inherit;
  width: 100%;
  grid-template-columns: repeat(12, 1fr);
  grid-gap: 24px;
  border:1px solid;
}

.element-header {
  grid-row: 1;
  grid-column: span 8;
  background:red;
  order:-2;
}

.samba-grid:before {
 content:"";
 order:-1;
 grid-column: span 4;
 background:blue;
 height:2px;
}

.samba-grid > span {
  height:50px;
  grid-column: span 2;
  background:green;
}

<div class="samba-grid">
  <div class="element-header">
    <h1>I am a lot of header text that only goes 8 columsn wide</h1>
  </div>
  <span></span>
  <span></span>
  <span></span>
  <span></span>
  <span></span>
  <span></span>
  <span></span>
  <span></span>
</div>

作为旁注，设置grid-row: 2并不意味着从第二行开始，而是意味着位于产生问题的第二行内部。