原文:
Flexbox and Truncated Text
译文:Flexbox 遇上换行文本
当你遇到这样的情况:在一个 flex 子元素中有一个单行文本,你不想让文本自动换行,用省略号断行(或者隐藏其余的部分)。但意想不到的是,布局截断了并强制整个 flex 父元素变宽。利用 flexbox 可以让布局变得更容易!
有一种标准的解决方案,只需要使用 non-flexbox 属性值就可以完成。
我们想要的效果是这样的
这个动画展示了一个变窄后的子元素。
你会遇到的问题是这样的
这个动画展示了没换行的文本阻止了变窄。
子元素的问题
让人不解的是如果文本直接在 flex 子元素内,就会很好:HTML 代码:
<divclass="flex-parent"> <divclass="flex-child">Textto truncatehere. </div> <divclass="flex-child">Otherstuff. </div></div>
CSS 代码:
/* 文本直接在子元素中,在这里换行 */.flex-child white-space: nowrap; overflow: hidden; text-overflow: ellipsis;}
当遇到子元素,就会出问题:
HTML 代码:
<divclass="flex-parent"> <divclass="flex-child"><h2 id="Textto-truncatehere">Textto truncatehere.</h2> </div> <divclass="flex-child">Otherstuff. </div></div>
CSS 代码:
/* 标题文本的时候,可以截断文本 */.flex-child > h2 { white-space: nowrap; overflow: hidden; text-overflow: ellipsis;}
解决方案:在 flex 子元素上设置 min-width: 0
或者把 min-width 改成其他具体数值。不这样的话包含其他文本元素的 flex 子元素就不会让这些文本元素的”隐含宽度”变窄了。
当我第一次碰到这样的情况的时候,我在 AJ Foster 那边找到了解决方法,他写道:
根据一项 规范草案 ,上面文本不应该当 flex 容器减小时,完全折叠。因为子标题已经有了 100% 的宽度, min-width: auto 会计算 flexbox 会使得容器比我想的要大。
我发现 Chrome、Opera 和 Firefox 都有这个特性。而 Safari 会收缩、截断,即使没有设置 min-width (可能是违背了规范)。
Demo
Codepen 上的 Demo 地址: http://codepen.io/chriscoyier/pen/zqedEr
- 生效的:文本框直接在 flex 子元素中;
- 无效的:文本框在 h2 内的 flex 子元素中;
- 生效的:文本框在 h2 ,但 flex 子元素设置了 min-width 。

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