Question

这就是我现在拥有的：

* {
  box-sizing: border-box;
}

.container {
  width:  300px;
  border: 1px solid #000;
}

.mainrow, .subrows div {
  width:   100%;
  padding: 10px
}

.mainrow {
  background: #CCC;
}

.subrows div {
  background: #DDD;
}

.subrows {
  overflow: auto;
}

<div class="container">
  <div class="mainrow">First row</div>
  <div class="subrows">
    <div>Sub row 1</div>
    <div>Sub row 2</div>
    <div>Sub row 3</div>
    <div>Sub row 4</div>
    <div>Sub row 5</div>
    <div>Sub row 6</div>
    <div>Sub row 7</div>
    <div>Sub row 8</div>
    <div>Sub row 9</div>
    <div>Sub row 10</div>
  </div>
</div>

我要防止.ops扩展.container。

我尝试了this post中描述的修复程序：

* {
  box-sizing: border-box;
}

.container {
  width:       300px;
  padding-top: 100px;
  border:      1px solid #000;
}

.mainrow, .subrows div {
  width:   100%;
  padding: 10px
}

.mainrow {
  background: #CCC;
}

.subrows {
  position:   absolute;
  width:      100%;
  max-height: 100px;
  top:        0;
  left:       0;
  overflow:   auto;
}

.subrows div {
  background: #DDD;
}

<div class="container">
  <div class="mainrow">First row</div>
  <div class="subrows">
    <div>Sub row 1</div>
    <div>Sub row 2</div>
    <div>Sub row 3</div>
    <div>Sub row 4</div>
    <div>Sub row 5</div>
    <div>Sub row 6</div>
    <div>Sub row 7</div>
    <div>Sub row 8</div>
    <div>Sub row 9</div>
    <div>Sub row 10</div>
  </div>
</div>

但是显然这是行不通的。 .subrows出现在.mainrow上方，并且布局变形。应该怎么办？

Answer 1

给出容器的相对位置并将top：100％添加到子行

* {
  box-sizing: border-box;
}

.container {
  width:       300px;
  border:      1px solid #000;
  position:relative;
}

.mainrow, .subrows div {
  width:   100%;
  padding: 10px
}

.mainrow {
  background: #CCC;
}

.subrows {
  position:   absolute;
  width:      100%;
  max-height: 100px;
  top:        100%;
  margin-top: 1px;      /* for container border to show */
  left:       0;
  overflow:   auto;
}

.subrows div {
  background: #DDD;
}

<div class="container">
  <div class="mainrow">First row</div>
  <div class="subrows">
    <div>Sub row 1</div>
    <div>Sub row 2</div>
    <div>Sub row 3</div>
    <div>Sub row 4</div>
    <div>Sub row 5</div>
    <div>Sub row 6</div>
    <div>Sub row 7</div>
    <div>Sub row 8</div>
    <div>Sub row 9</div>
    <div>Sub row 10</div>
  </div>
</div>

从容器的边界可以看到，它尚未扩展为适合子行（为什么要这么做，我不知道，因为主行下方的任何内容现在都将被子行覆盖）

Answer 2

* {
  box-sizing: border-box;
}

.container {
  width:       300px;
  border:      1px solid #000;
}

.mainrow, .subrows div {
  width:   100%;
  padding: 10px
}

.mainrow {
  background: #CCC;
}

.subrows {
  position:   relative;
  width:      100%;
  height: 100px;
  top:        0;
  left:       0;
  overflow:   auto;
}

.subrows div {
  background: #DDD;
}

<div class="container">
  <div class="mainrow">First row</div>
  <div class="subrows">
    <div>Sub row 1</div>
    <div>Sub row 2</div>
    <div>Sub row 3</div>
    <div>Sub row 4</div>
    <div>Sub row 5</div>
    <div>Sub row 6</div>
    <div>Sub row 7</div>
    <div>Sub row 8</div>
    <div>Sub row 9</div>
    <div>Sub row 10</div>
  </div>
</div>

防止特定的子元素扩展其父元素

2 个答案: