使用 CSS 在表格单元格内绘制箭头 [英] draw an arrow inside table cell using CSS

问题描述

我的一些表格单元格的内容非常多.我不想在用户悬停在单元格上之前显示所有这些，但我想在角落里放一个箭头来表示它可以悬停 - 就像在 excel 注释中一样.我怎样才能使用 CSS 做到这一点?

Some of my table cells have really large amounts of content. I don't want to display all of them until the user hovers on the cell, but I want to put a arrow in the corner to indicate it can be hovered - just like in the excel comment. How can I do this using CSS?

推荐答案

使用 CSS 形状和伪元素:

Using CSS Shapes and pseudo-elements:

HTML

<table>
    <tr><td class="comment">Foo</td></tr>
</table>

CSS

* { margin: 0; padding: 0;}
td { border: 1px solid black; }
.comment:after {
    content: "";
    position: relative;
    top: 0.5em;
    border-left: 0.5em solid transparent;
    border-top: 0.5em solid red;
}

演示

更新了修复包装的答案:

Updated answer to fix wrapping:

/* add relative positioning to the td */
td { border: 1px solid black; position: relative; }
/* and absolute positioning for the triangle */

.comment:after {
    content: "";
    position: absolute;
    /* left: calc(100% - 0.5em); */
    /* use right: 0; instead */
    right: 0;
    top: 0;
    border-left: 0.5em solid transparent;
    border-top: 0.5em solid red;
}

固定演示

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