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html - 高度为 100% 的 Div 溢出到其父级下方的 flexbox 行

问题描述

我在 flexbox 数组中有一系列元素。每个元素都包含一个“卡片”，其高度各不相同。当我试图让卡片占据它们所在的 flexbox 子元素的剩余空间时，它们会溢出到下面行中的元素中。如果我指定所有 flex-children 的高度都是 100%，那么它们的高度实际上会缩小到它们内部卡片的大小。

#flex_parent {
  margin: 1em;
  display: flex;
  flex-wrap: wrap;
}

.flex-child {
  box-sizing: border-box;
  margin-bottom: 1em;
  width: 50%;
}

.full-height {
  height: 100%;
  background: #99F !important;
}

.child-description {
  height: 100%;
}


/* cosmetic */

body {
  background: black;
  color: white;
}

h4 {
  color: red;
}

.flex-child {
  border: 1px dotted red;
}

.child-card {
  background: #FFA;
  color: #000;
}
<body>
  <div id="flex_parent">
    <div class="flex-child">
      <h4>Title title title</h4>
      <div class="child-card">
        <div class="child-description">
          <p>123 123</p>
        </div>
      </div>
    </div>
    <div class="flex-child">
      <h4>Title title title</h4>
      <div class="child-card">
        <div class="child-description">
          <p>123 123<br>123 123</p>
        </div>
      </div>
    </div>
    <div class="flex-child">
      <h4>Title title title</h4>
      <div class="child-card full-height">
        <div class="child-description">
          <p>123 123<br>123 123</p>
        </div>
      </div>
    </div>
    <div class="flex-child">
      <h4>Title title title</h4>
      <div class="child-card full-height">
        <div class="child-description">
          <p>123 123<br>123 123<br>123 123<br>123 123<br>123 123</p>
        </div>
      </div>
    </div>
    <div class="flex-child">
      <h4>Title title title</h4>
      <div class="child-card full-height">
        <div class="child-description">
          <p>123 123<br>123 123<br>123 123<br>123 123<br>123 123</p>
        </div>
      </div>
    </div>
    <div class="flex-child">
      <h4>Title title title</h4>
      <div class="child-card full-height">
        <div class="child-description">
          <p>123 123</p>
        </div>
      </div>
    </div>
    <div class="flex-child">
      <h4>Title title title</h4>
      <div class="child-card">
        <div class="child-description">
          <p>123 123<br>123 123</p>
        </div>
      </div>
    </div>
    <div class="flex-child">
      <h4>Title title title</h4>
      <div class="child-card">
        <div class="child-description">
          <p>123 123<br>123 123<br>123 123<br>123 123<br>123 123</p>
        </div>
      </div>
    </div>
    <div class="flex-child">
      <h4>Title title title</h4>
      <div class="child-card">
        <div class="child-description">
          <p>123 123<br>123 123<br>123 123<br>123 123<br>123 123</p>
        </div>
      </div>
    </div>
    <div class="flex-child">
      <h4>Title title title</h4>
      <div class="child-card">
        <div class="child-description">
          <p>123 123</p>
        </div>
      </div>
    </div>
  </div>
</body>

蓝色的卡片是 100% 的高度。它们实际上是其父级的 100% 的高度，但这意味着它们溢出。

我如何让他们只扩展到他们父母的底部？

标签： htmlcssflexbox

解决方案

使用flexfor.flex-child然后添加flex-grow: 1;到子类。

添加 flex-grow: 1;whenflex-direction: column;将强制元素占据容器的剩余高度。

#flex_parent {
  margin: 1em;
  display: flex;
  flex-wrap: wrap;
}

.flex-child {
  box-sizing: border-box;
  width: 50%;
  display: flex;
  flex-direction: column;
}

.child-description {
  height: 100%;
}


/* cosmetic */

body {
  background: black;
  color: white;
}

h4 {
  color: red;
}

.flex-child {
  border: 1px dotted red;
}

.child-card {
  background: #FFA;
  color: #000;
  flex-grow: 1;
}

.full-height {
  background: #99F !important;
}
<div id="flex_parent">
  <div class="flex-child">
    <h4>Title title title</h4>
    <div class="child-card">
      <div class="child-description">
        <p>123 123</p>
      </div>
    </div>
  </div>
  <div class="flex-child">
    <h4>Title title title</h4>
    <div class="child-card">
      <div class="child-description">
        <p>123 123<br>123 123</p>
      </div>
    </div>
  </div>
  <div class="flex-child">
    <h4>Title title title</h4>
    <div class="child-card full-height">
      <div class="child-description">
        <p>123 123<br>123 123</p>
      </div>
    </div>
  </div>
  <div class="flex-child">
    <h4>Title title title</h4>
    <div class="child-card full-height">
      <div class="child-description">
        <p>123 123<br>123 123<br>123 123<br>123 123<br>123 123</p>
      </div>
    </div>
  </div>
  <div class="flex-child">
    <h4>Title title title</h4>
    <div class="child-card full-height">
      <div class="child-description">
        <p>123 123<br>123 123<br>123 123<br>123 123<br>123 123</p>
      </div>
    </div>
  </div>
  <div class="flex-child">
    <h4>Title title title</h4>
    <div class="child-card full-height">
      <div class="child-description">
        <p>123 123</p>
      </div>
    </div>
  </div>
  <div class="flex-child">
    <h4>Title title title</h4>
    <div class="child-card">
      <div class="child-description">
        <p>123 123<br>123 123</p>
      </div>
    </div>
  </div>
  <div class="flex-child">
    <h4>Title title title</h4>
    <div class="child-card">
      <div class="child-description">
        <p>123 123<br>123 123<br>123 123<br>123 123<br>123 123</p>
      </div>
    </div>
  </div>
  <div class="flex-child">
    <h4>Title title title</h4>
    <div class="child-card">
      <div class="child-description">
        <p>123 123<br>123 123<br>123 123<br>123 123<br>123 123</p>
      </div>
    </div>
  </div>
  <div class="flex-child">
    <h4>Title title title</h4>
    <div class="child-card">
      <div class="child-description">
        <p>123 123</p>
      </div>
    </div>
  </div>
</div>

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