固定位置元素继承了flex项目的宽度 [英] Fixed position element inheriting width of flex item

问题描述

我正在构建一个UI，它需要在视口底部有一个固定的位置/粘性元素，宽度受主要内容区域的限制。主要内容区域可选择地侧面有（固定）具有固定宽度的左侧和/或右侧边栏，因此我使用Flexbox构建具有 flex-grow：1

I'm building out a UI that requires a fixed position/sticky element at the bottom of the viewport with a width constrained by a main content area. The main content area is optionally flanked by (sibling) left and/or right sidebars with fixed widths, so I'm using Flexbox to build the three column structure with flex-grow: 1 on the main content.

我从@Marc Audet接受的答案学习了设置 width：inherit 在固定元素上通常是如何解决这个问题，但它似乎只有当它的父级有一个指定的宽度，这不利于我考虑我需要主要内容区域以填充页面的剩余宽度。

I've learned from @Marc Audet's accepted answer at How can I make a fixed positioned div inherit width of parent? that setting width: inherit on the fixed element is typically how to solve this problem, but it only seems to work when there's a specified width on its parent, which doesn't help me considering I need the main content area to fill the remaining width of the page.

有没有人有任何想法来解决这个问题？请查看我的小提琴的代码/示例。

Does anyone have any ideas for getting around this? Check out my Fiddle for the code/example. Any help would be appreciated!

推荐答案

CSS

CSS

html {
  box-sizing: border-box;
  font: 400 16px/1.45 'Source Code Pro';
}

*,
*:before,
*:after {
  box-sizing: inherit;
  margin: 0;
  padding: 0;
  border: 0;
  outline: none;
  overflow-x: hidden;
}

body {
  background: #121;
  color: #FEF;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  width: 100vw;
  height: 100vh;
}

.container {
  display: flex;
  color: #fff;
  height: -moz-fit-content;
  height: -webkit-fit-content;
  height: fit-content;
  background: blue;
}

.left {
  background: blue;
  min-height: 100vh;
  min-width: 150px;
  flex-shrink: 0;
}

.middle {
  background: green;
  min-height: 100vh;
  overflow: hidden;
  width: calc(100vw - 400px);
  padding-bottom: 60px;
  flex-grow: 1;
  flex-shrink: 0;
}

.middle .fixed-footer {
  background: orange;
  position: fixed;
  bottom: 0;
  width: 100vw;
  width: inherit;
  padding: 16px 0;
  overflow-x: hidden;
}

.right {
  background: blue;
  min-height: 100vh;
  min-width: 250px;
  flex-shrink: 0;
}

@media screen and (min-width: 640px) {
  html {
    margin-left: calc(100vw - 100%);
    margin-right: 0;
    overflow-y: auto;
  }
}

添加星球大战ipsum内容以演示 .middle 的垂直灵活性以及 .fixed-footer 是固定的， .middle 的宽度。

Added Star Wars ipsum content to demonstrate .middle's vertical flexibility and how .fixed-footer is stationary and is .middle's width.

DEMO

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