javascript - 添加新子元素时，父容器仅将子元素包裹到屏幕边缘(首选 IE 11 支持)

Question

我正在处理水平放置列表的 ToDo-List。每个列表顶部都有一个标题，列表垂直溢出。

我有一个带有 y 滚动条的容器，而标题固定在顶部。此外，我可以水平添加新列表。当向右 x 滚动时，整个页面将滚动，因此标题与列表保持对齐。

问题:当我向右滚动以查看溢出时，滚动条没有扩展到占新子元素的新宽度，而是向左移动。容器的最大宽度保持在屏幕宽度(例如 1920 像素)。新的列表元素保持隐藏状态。

请看这个 fiddle 用于可视化。如您所见，滚动条位于 content 5 后面，而 content 6 和 content 7 隐藏。

我已经尝试了各种 css 属性，例如 float 和清除等。固定宽度不适合我。

唯一有效的是使用 Javascript/JQuery 动态计算新宽度，但是在更宽的列表容器上，y 滚动条对用户是隐藏的。我希望滚动条始终可见。

.header-wrapper {
  display: flex;
  background: whitesmoke;
  text-align: center;
}

.lists-wrapper {
  display: flex;
  background: whitesmoke;
  text-align: center;
  overflow-y: scroll;
  overflow-x: hidden;
  height: 80%;
}

.header {
  min-width: 200px;
  border-bottom: 1px solid grey;
}

.list {
  min-width: 200px;
  border-right: 1px solid lightgrey;
  border-bottom: 3px solid orange;
  background: steelblue;
  color: white;
  height: 1000px;
}

.outer {
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  overflow-y: hidden;
  overflow-x: scroll;
  position: absolute;
}

<div class="outer">

  <div class="header-wrapper">

    <div class="header">
      <span>Title 1</span>
    </div>

    <div class="header">
      <span>Title 2</span>
    </div>

    <div class="header">
      <span>Title 3</span>
    </div>

    <div class="header">
      <span>Title 4</span>
    </div>

    <div class="header">
      <span>Title 5</span>
    </div>

    <div class="header">
      <span>Title 6</span>
    </div>

    <div class="header">
      <span>Title 7</span>
    </div>

  </div>
  <div class="lists-wrapper">

    <div class="list">
      content 1
    </div>

    <div class="list">
      content 2
    </div>

    <div class="list">
      content 3
    </div>

    <div class="list">
      content 4
    </div>

    <div class="list">
      content 5
    </div>

    <div class="list">
      content 6
    </div>

    <div class="list">
      content 7
    </div>

  </div>


</div>

Answer 1

您可以添加一个具有溢出内容宽度的额外包装器:

.header-wrapper {
  display: flex;
  background: whitesmoke;
  text-align: center;
}

.lists-wrapper {
  display: flex;
  background: whitesmoke;
  text-align: center;
  overflow-y: scroll;
  overflow-x: hidden;
  height: 80%;
  width: 100%;
}

.header {
  min-width: 200px;
  border-bottom: 1px solid grey;
}

.list {
  min-width: 200px;
  border-right: 1px solid lightgrey;
  border-bottom: 3px solid orange;
  background: steelblue;
  color: white;
  height: 1000px;
}

.outer {
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  overflow-y: hidden;
  overflow-x: scroll;
  position: absolute;
}

.intermediate {
  display: inline-block; /* to make its width be the width of the content; */
  height: 100%; /* to make the children percentage height still work */
  vertical-align: top; /* to mitigate the possible artifacts of inline positioning */
}

<div class="outer">

  <div class="intermediate">

  <div class="header-wrapper">

    <div class="header">
      <span>Title 1</span>
    </div>

    <div class="header">
      <span>Title 2</span>
    </div>

    <div class="header">
      <span>Title 3</span>
    </div>

    <div class="header">
      <span>Title 4</span>
    </div>

    <div class="header">
      <span>Title 5</span>
    </div>

    <div class="header">
      <span>Title 6</span>
    </div>

    <div class="header">
      <span>Title 7</span>
    </div>

  </div>
  <div class="lists-wrapper">

    <div class="list">
      content 1
    </div>

    <div class="list">
      content 2
    </div>

    <div class="list">
      content 3
    </div>

    <div class="list">
      content 4
    </div>

    <div class="list">
      content 5
    </div>

    <div class="list">
      content 6
    </div>

    <div class="list">
      content 7
    </div>

  </div>

</div>

</div>