如何使用绝对页眉和页脚实现全高度滚动？

Question

我很好奇是否有人可以一起实现 100% 的这些要求，我只能实现 80%（#4 很痛苦）：

1. 标题始终位于页面顶部。
2. 页脚始终位于页面底部。
3. main 占据页面剩余的中间位置，无论是否溢出。
4. 当 main 溢出时，会有一个滚动条占据浏览器的 整个 高度（即页眉、正文和页脚旁边）。可选奖励：当 main 很小时，没有滚动条。
5. 只有主要体验会过度滚动。页眉和页脚不会出现过度滚动。

到目前为止我所做的最好的没有完整的滚动条高度：

<div className="flex flex-col h-full overflow-hidden">
  <header />
  <main className="flex-1 overflow-auto" /> 
  <footer />
</div>

我正在使用 Tailwind，但也可以随意使用纯 CSS。希望它不会像我一样粉碎你的灵魂。

Answer 1

你可以试试这个

html代码

<div class="container">
  <header>Header</header>
  <main>
    <div style="width: 300px;">Main Content</div>
  </main>
  <footer>Footer</footer>
</div>

和CSS

<style>
  html, body, #root {
    height: 100%;
    margin: 0;
  }
  
  .container {
    position: relative;
    height: 100%;
    display: flex;
    flex-direction: column;
  }

  header {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 60px;
    background-color: #333;
    color: white;
    text-align: center;
    line-height: 60px;
  }

  main {
    flex: 1;
    overflow-y: auto;
    padding-top: 60px;
    padding-bottom: 60px;
    display: flex;
    justify-content: center;
    align-items: center;
  }

  footer {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 60px;
    background-color: #333;
    color: white;
    text-align: center;
    line-height: 60px;
  }
</style>

Answer 2

你说基本 css 就可以了，所以在这里我给你另一种方法，做一些小的改变，比如不使用像你的 css 类这样的属性或将

position: absolute

更改为

position: fixed

。

* {margin: 0; padding: 0; box-sizing: border-box;}
div {position: relative; min-height: 100vh;}
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: lightblue;
    padding: 15px;
}
footer {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    background: lightgray;
    padding: 15px;
}
main {
    background: lightgreen;
    min-height: 100vh;
    padding: 63px 15px;
}

<div>
    <header>Header</header>
    <main>
        <h3>Main</h3>
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    </main>
    <footer>Footer</footer>
</div>