Flexbox /由于嵌套元素而扩展的高度

分类：编程问答

如何解决Flexbox /由于嵌套元素而扩展的高度

我有一个嵌套的元素，该元素会增长，并且我正在尝试使用flexbox使其外部容器适应其高度。尝试使“橙色”元素垂直延伸，以在下面的笔中包含最里面的文本：https://codepen.io/cssbog/pen/KKzgxgd 

    <ol class="menu-item-list">
  <li id="menu-item-las-powr" class="menu-item control-slider active">
    <div class="label">Label</div>
    <div class="value">
      <div class="slider-view"> 
        <div class="slider-box">
          <div class="safe-slider">    
            <div class="slider-val-line-parent">
              <div class="slider-val-text">
                BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO
              </div>
            </div>
          </div>
        </div>
      </div>
    </div>
  </li>
</ol>

解决方法

更新
正如我在评论中已经说过的。您不能单独更改元素的高度，它们都处于父子关系中。

您应该考虑使用较少的标记，并可能使用其他方法来实现相同的目标。如果是关于样式的，则可以使.value与.slider-val-text一起增长，并使用独立的absolute元素覆盖.slider-val-text（您只需添加足够的填充和在顶部绘制此绿色框背景。

但是，您可以为.value容器设置固定高度。尝试height: 168px。这样做的问题是，它不会根据您在.slider-val-text中输入的文本而改变。

一旦DOM完成加载，您就可以使用JavaScript并根据.value的高度设置.slider-val-text容器的高度。

document.addEventListener("DOMContentLoaded",function() {
  const childHeight = document.querySelector('.slider-val-text').offsetHeight;
  const parent = document.querySelector('.value');
  let verticalPadding = parseInt(window.getComputedStyle(parent,null).getPropertyValue('padding-top'));
  verticalPadding += parseInt(window.getComputedStyle(parent,null).getPropertyValue('padding-bottom'));
  parent.style.height = childHeight + verticalPadding + 'px';
});
.menu-item-list {
  position: absolute;
  top: 2em;
  left: 1em;
  right: 40%;
}

.menu-item-list li {
  display: flex;
}

.menu-item-list .control-slider .value {
  box-sizing: border-box;
  /* ADDED */
  padding: 0 1em 0 0;
}

.menu-item-list .control-slider .slider-view {
  width: 100%;
  padding: 0;
  display: flex;
}

.menu-item-list .control-slider .slider-view .slider-val-line-parent {
  padding: 0;
  text-align: right;
  display: flex;
  flex-flow: column wrap;
  /*position: absolute; REMOVED */
  left: 0;
}

.menu-item-list .control-slider .slider-view .slider-val-line-parent .slider-val-text {
  flex: 1;
  /* width: calc(100% + 16px); REMOVED */
  /*right: 7px;
  position: relative;
  top: 36px; REMOVED */
  padding-top: 36px;
  padding-right: 0px;
  padding-left: 0px;
  font-size: 14px;
  justify-content: right;
}

.menu-item-list .control-slider .slider-box {
  height: 1.5em;
  padding: 0.1em 0.25em;
  width: 50%;
  position: relative;
  background-color: purple;
  opacity: 50%;
}

.menu-item-list .control-slider .slider-box .safe-slider {
  background-color: green;
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  position: relative;
}

.menu-item-list .control-slider .slider-box .safe-slider .slider-val-line-parent {
  border-style: dashed;
  border-color: black;
  display: flex;
}

.menu-item-list .menu-item {
  background-color: orange;
}

.menu-item-list .menu-item .label {
  width: 57%;
  background-color: yellow;
  opacity: 50%;
}

.menu-item-list .menu-item .value {
  width: 43%;
}

.menu-item-list .menu-item.active.control-slider {
  display: flex;
  flex-direction: column;
}

.menu-item-list .menu-item.active.control-slider .label {
  width: 100%;
  margin: 0;
}

.menu-item-list .menu-item.active.control-slider .value {
  width: 100%;
  padding: 1em 1em 1.5em;
}
<ol class="menu-item-list">
  <li id="menu-item-las-powr" class="menu-item control-slider active">
    <div class="label">Label</div>
    <div class="value">
      <div class="slider-view">
        <div class="slider-box">
          <div class="safe-slider">
            <div class="slider-val-line-parent">
              <div class="slider-val-text">
                BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO
                BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO
              </div>
            </div>
          </div>
        </div>
      </div>
    </div>
  </li>
</ol>

您不能在absolute上下文中使用static定位，并且期望它们改变static元素的大小。它们位于独立的层上。如果您想知道：Static元素是默认元素，即，如果您未指定位置，则为position: static。

位置属性对于理解至关重要。我建议您阅读此mdn article here。

我已使用此converter tool here将您的SASS代码转换为CSS，以提供摘要。

请让我知道您是否打算这样做。

.menu-item-list {
  position: absolute;
  top: 2em;
  left: 1em;
  right: 40%;
}

.menu-item-list li {
  display: flex;
}

.menu-item-list .control-slider .value {
  padding: 0 1em 0 0;
  box-sizing: border-box;
}

.menu-item-list .control-slider .slider-view {
  width: 100%;
  padding: 0;
  display: flex;
}

.menu-item-list .control-slider .slider-view .slider-val-line-parent {
  padding: 0;
  text-align: right;
  display: flex;
  flex-flow: column wrap;
  left: 0;
}

.menu-item-list .control-slider .slider-view .slider-val-line-parent .slider-val-text {
  flex: 1;
  padding-right: 0px;
  padding-left: 0px;
  font-size: 14px;
  justify-content: right;
}

.menu-item-list .control-slider .slider-box {
  padding: 0.1em 0.25em;
  width: 50%;
  background-color: purple;
  opacity: 50%;
}

.menu-item-list .control-slider .slider-box .safe-slider {
  background-color: green;
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  position: relative;
}

.menu-item-list .control-slider .slider-box .safe-slider .slider-val-line-parent {
  border-style: dashed;
  border-color: black;
  display: flex;
}

.menu-item-list .menu-item {
  background-color: orange;
}

.menu-item-list .menu-item .label {
  width: 57%;
  background-color: yellow;
  opacity: 50%;
}

.menu-item-list .menu-item .value {
  width: 43%;
}

.menu-item-list .menu-item.active.control-slider {
  display: flex;
  flex-direction: column;
}

.menu-item-list .menu-item.active.control-slider .label {
  width: 100%;
  margin: 0;
}

.menu-item-list .menu-item.active.control-slider .value {
  width: 100%;
  padding: 1em 1em 1.5em;
}
<ol class="menu-item-list">
  <li id="menu-item-las-powr" class="menu-item control-slider active">
    <div class="label">Label</div>
    <div class="value">
      <div class="slider-view">
        <div class="slider-box">
          <div class="safe-slider">
            <div class="slider-val-line-parent">
              <div class="slider-val-text">
                BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO
                BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO BOO
              </div>
            </div>
          </div>
        </div>
      </div>
    </div>
  </li>
</ol>

这是SASS代码。我已经用(ADDED)或(REMOVED)标记了修改的行，其他注释已经在那里。

.menu-item-list {
  position: absolute;
  top: 2em;
  left: 1em;
  right: 40%;

  li {
    display: flex;
  }

  .control-slider {
    .value {
      padding: 0 1em 0 0;
      box-sizing: border-box; // (ADDED)
    }

    .slider-view {
      width: 100%;
      padding: 0;
      display: flex;

      .slider-val-line-parent {
        padding: 0;
        // height: 100%;
        text-align: right;
        // display: none;
        display: flex;
        flex-flow: column wrap;
        // position: absolute; (REMOVED)
        left: 0;

        .slider-val-text {
          flex: 1;
          //width: calc(100% + 16px); (REMOVED)
          //right: 7px; (REMOVED)
          //position: relative; (REMOVED)
          //top: 36px; (REMOVED)
          padding-right: 0px;
          padding-left: 0px;
          font-size: 14px;
          justify-content: right;
          // height: auto;
        }
      }
    }

    .slider-box {
      //height: 1.5em; (REMOVED)
      padding: 0.1em 0.25em;
      width: 50%;
      //position: relative; (REMOVED)
      background-color: purple;
      opacity: 50%;

      .safe-slider {
        background-color: green;
        margin: 0;
        padding: 0;
        width: 100%;
        height: 100%; // without this,slider fill disappears
        position: relative;

        .slider-val-line-parent {
          border-style: dashed;
          border-color: black;
          // display: inline-block;
          display: flex;
        }
      }
    }
  }

  .menu-item {
    background-color: orange;
    // height: auto;
    .label {
      width: 57%;
      background-color: yellow;
      opacity: 50%;
    }
    .value {
      width: 43%;
    }
  }

  .menu-item.active.control-slider {
    // display: list-item;
    display: flex;
    flex-direction: column;

    .label {
      width: 100%;
      margin: 0;
    }

    .value {
      width: 100%;
      padding: 1em 1em 1.5em;
    }
  }
}

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