将聊天框修复到底部，或调整内容的高度

Question

没有JS，只有CSS，允许使用flexbox

JsFiddle：https://jsfiddle.net/ex9fmqxv/

.mdl-layout
 .mdl-layout__inner-container
   .mdl-layout__header
   .mdl-layout__drawer
   .mdl-grid
    .mdl-cell
      ul (list-msg adaptive height)
      div (chat box fixed to bottom)
   .mdl-grid (user list)

我正在尝试使用GMD反应对屏幕高度/宽度为100％的响应式网站进行测试。

我希望每次调整窗口大小时，它都可以重新计算内容的高度并适应像Slack.com这样的内容。

使用jQuery我知道如何计算高度来完成所有这些但不使用任何人有任何想法？

在图片中，您可以自动查看我想要的计算结果。

如果你有另一个解决方案，聊天栏仍然是页脚，中心内容是可滚动的，我感兴趣。

Answer 1

您可以使用flexbox和viewport units执行此操作。

视口单位的使用方式与百分比相同，50vh等于视口高度的50％。

这是用于演示目的的最小示例。

相对页眉和页脚

标题（13vh）+主（74vh）+页脚（13vh）= 100vh（100％视口高度）

body {
  margin: 0;
  display: flex;
  flex-direction: column;
}
main {
  flex-basis: 74vh;
  overflow-y: auto;
  background-color: rgba(162, 196, 162, 0.5);
}
header,
footer {
  flex-basis: 13vh;
  background-color: rgba(162, 192, 232, 0.5);
}

<header>
  Header
</header>
<main>
  <p>
    Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content.
  </p>
  <p>
    Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content.
  </p>
  <p>
    Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content.
  </p>
  <p>
    Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content.
  </p>
  <p>
    Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content.
  </p>
  <p>
    Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content.
  </p>
  <p>
    Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content.
  </p>
  <p>
    Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content.
  </p>
  <p>
    Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content.
  </p>
  <p>
    Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content.
  </p>
  <p>
    Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content.
  </p>
  <p>
    Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content.
  </p>
  <p>
    Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content.
  </p>
  <p>
    Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content.
  </p>
  <p>
    Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content.
  </p>
  <p>
    Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content.
  </p>
</main>
<footer>
  Footer
</footer>

固定页眉和页脚

使用calc()从完整视口高度中减去固定高度的总和，以便为变量高度元素设置。

body {
  margin: 0;
  display: flex;
  flex-direction: column;
}
main {
  flex-basis: calc(100vh - 200px);
  overflow-y: auto;
  background-color: rgba(162, 196, 162, 0.5);
}
header,
footer {
  flex-basis: 100px;
  background-color: rgba(162, 192, 232, 0.5);
}

<header>
  Header
</header>
<main>
  <p>
    Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content.
  </p>
  <p>
    Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content.
  </p>
  <p>
    Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content.
  </p>
  <p>
    Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content.
  </p>
  <p>
    Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content.
  </p>
  <p>
    Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content.
  </p>
  <p>
    Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content.
  </p>
  <p>
    Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content.
  </p>
  <p>
    Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content.
  </p>
  <p>
    Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content.
  </p>
  <p>
    Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content.
  </p>
  <p>
    Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content.
  </p>
  <p>
    Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content.
  </p>
  <p>
    Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content.
  </p>
  <p>
    Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content.
  </p>
  <p>
    Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content. Content.
  </p>
</main>
<footer>
  Footer
</footer>

Answer 2

我会说Flexbox方法对于这种情况来说是更好的选择。以下是一个例子：

＆＃13;

＆＃13;

*,*:after,*:before{
  box-sizing: border-box;
}

body{margin:0}

main{
  width: 100%;
  height: 200px;
  max-height: 200px;
  
  display: -webkit-flex;
  display: flex;
  -webkit-flex-flow: column nowrap;
  flex-flow: column nowrap;
}

section{
  width: 100%;
  overflow-y: scroll;
  background-color: red;
  flex: 1 auto;
  height: 100%;
}

.input{
  width: 100%;
  flex: 0 0 auto;
  background-color: green;
}

textarea{
  width: 100%;
  max-width: 100%;
}

＆＃13;

<main class="flex parent">
  <section class="red">
    <ul>
      <li>Chat bubble</li>
      <li>Chat bubble</li>
      <li>Chat bubble</li>
      <li>Chat bubble</li>
      <li>Chat bubble</li>
      <li>Chat bubble</li>
      <li>Chat bubble</li>
      <li>Chat bubble</li>
      <li>Chat bubble</li>
      <li>Chat bubble</li>
    </ul>
  </section>
  <div class="input green">
    <textarea>Try resiring me!</textarea>
  </div>
</main>

＆＃13;

＆＃13;

＆＃13;

警告你可以使用textarea resize来操作textarea部分，手动使用它是很奇怪的，因为向下鼠标移动会导致盒子向上增长。这可能是固定的，通过使用onchange事件添加/删除新的文本行时，无需调整大小和编辑文本框的高度。

然而，为了测试起见，我保持原样，因为它很好地演示了flexbox可以做什么。