flexbox子级能否具有溢出滚动条? [英] Can flexbox children have overflow scrollbar(s)?

问题描述

我想使用 CSS3 flexbox模型创建跨设备布局，并找到 HugoGiraudel的一个不错的示例布局，用作起点.

I'd like to use the CSS3 flexbox model to create a cross-device layout and found a nice example layout by HugoGiraudel which I used as a starting point.

布局基本上是这样的:

这是HTML的结构:

<div class="wrapper">
  <header class="header">Header</header>
  <article class="main">
    ...
  </article>
  <aside class="aside aside-1">Aside 1</aside>
  <aside class="aside aside-2">Aside 2</aside>
  <footer class="footer">Footer</footer>
</div>

这是CSS最重要的部分:

Here the most important parts of the CSS:

.wrapper {
  display: flex;
  flex-flow: row wrap;
}
.wrapper > * {
  padding: 10px;
  flex: 1 100%;
}
.aside { flex: 1 auto; }
.main    { flex: 3 0px; }

我的问题是，当文章包含的内容超出屏幕显示的内容时，外部.wrapper旁边会出现一个垂直滚动条，并且页脚不再可见.

My problem is when the article contains more content than fits on the screen, a vertical scrollbar appears next to the outer .wrapper and the footer isn't visible any more.

我尝试将overflow: scroll和flex-flow: column wrap添加到文章的样式中，但是没有成功-滚动条是可见的，但是文章总是会完全包含其内容.

I tried to add overflow: scroll and flex-flow: column wrap to the article's styling, but without success - the scrollbars are visible but the article always grows to completely enclose its contents.

如果内容增加，如何保持页脚可见并滚动文章?

How can I keep the footer visible and the article scrolling if the contents grow?

推荐答案

您的文章内容扩展了整个版式的原因是它没有任何高度限制.像max-height这样的东西会限制它的增长，然后会出现一个垂直滚动条.

The reason your article content expands the whole layout is that it doesn't have any height limitation. Something like max-height would limit its growth, and then a vertical scrollbar could appear.

以下是您的代码，进行了一些调整:

Here's your code with a few adjustments:

HTML (为文章和助手添加了一个嵌套的flex容器)

HTML (added a nested flex container for article and asides)

<div class="wrapper">
  <header class="header">Header</header>
  <section class="inner-wrapper">
    <article class="main">
      <p>Pellentesque habitant morbi tristique senectus et netus et malesuada 
         fames ac turpis egestas...</p>
      <p>Pellentesque habitant morbi tristique senectus et netus et malesuada 
         fames ac turpis egestas...</p>
      <p>Pellentesque habitant morbi tristique senectus et netus et malesuada 
         fames ac turpis egestas...</p>
                            .
                            .
                            .
    </article>
    <aside class="aside aside-1">Aside 1</aside>
    <aside class="aside aside-2">Aside 2</aside>
  </section>
  <footer class="footer">Footer</footer>
</div>

CSS (仅用于按键调整)

html, body {
  height: 100%;
}

.wrapper {
  display: flex;  
  height: 100%;
  flex-direction: column;        /* switch main container from row direction */
}

.inner-wrapper {
  display: flex;                 /* nested flex container; row direction */
  flex: 0 0 50%;                 /* limit height of container; adjust as necessary */
  min-height: 0;                 /* addresses a scrolling bug in Firefox;
                                    http://stackoverflow.com/a/34982902/3597276 */
}

.header {
    flex: 1;                     /* header to occupy all available height */
}

.footer {
  flex: 1;                       /* footer to occupy all available height */
}

.main {
  overflow-y: scroll;            /* enable vertical scrollbar */
}

修订的Codepen

注意:

• 现在主伸缩容器(.wrapper)具有三个垂直堆叠的伸缩项.
• 每个项目的高度都可以单独设置.在上面的代码中，告诉页眉和页脚消耗所有可用空间(flex: 1).中间的flex项目(.inner-wrapper)被限制为50％，从而可以滚动.尝试使用25％和75％的替代示例.
• 中间的项目还可以用作flex容器，并对齐物品和水平放置的侧面.每个项目的宽度可以单独设置.上一点也适用于此.

• Now the main flex container (.wrapper) has three flex items stacked vertically.
• The height of each item can be set individually. In the code above, the header and footer are told to consume all available space (flex: 1). The middle flex item (.inner-wrapper) is confined to 50%, which enables scrolling. Try 25% and 75% for alternative examples.
• The middle item doubles as a flex container, and lines up the article and asides horizontally. The width of each item can be set individually. The previous point applies here, as well.

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