如何将工具提示水平放置在链接顶部 [英] How to center a tooltip horizontally on top of a link

问题描述

我想要一个工具提示框插入到a标签的顶部和中心。我有这个工作的小文本，但我似乎不能把它放在大文本的中心。

I'm trying to get a tooltip box to be inserted on top and centered of an a tag. I have this working for small Text, but I can't seem to get it to center on large text.

我知道它与定位的框和箭头，但我似乎找不到正确的组合，让箭头集中在框和中心在a标签上方的框中。

I understand it has to do with positioning the box and the arrow but I can't seem to find the right combination to get the arrow centered under the box and the box centered above the a tag.

我希望完成这只需要CSS。

I'm hoping to accomplish this with just CSS alone.

HTML：

<div> 
    <a class="tooltip" href="#" title="tooltip">
        <span>Text</span>    
    </a>

</div>
<div> <a class="tooltip" href="#" title="tooltip">
        <span>TextTextText</span>    
    </a>

</div>

CSS：

div {
    padding: 150px;
    display: inline-block;
    background-color: red;
}
.tooltip{
    display: inline;
    position: relative;
}
.tooltip:hover:after{
    background: #333;
    background: rgba(0,0,0,.8);
    border-radius: 5px;
    bottom: 26px;
    color: #fff;
    content: attr(title);
    padding: 10px;
    left: -50%;
    position: absolute;
    z-index: 98;
}
.tooltip:hover:before{
    border: solid;
    border-color: #333 transparent;
    border-width: 6px 6px 0 6px;
    bottom: 20px;
    content: "";
    left: 30%;
    position: absolute;
    z-index: 99;
}

这里是小提琴。

我真的很感激能得到任何帮助。

I really would appreciate any help I can get.

推荐答案

如果工具提示没有明确的宽度可以通过使用否定 translateX 如下：

If the tooltip doesn't have an explicit width, you could align that horizontally center, by using a negative translateX as follows:

.tooltip:hover:after {
    left: 50%;
    transform: translateX(-50%);
    /* other styles ... */
}

.tooltip:hover:before {
    left: 50%;
    transform: translateX(-50%);
    /* other styles ... */
}

JSFiddle演示 。

JSFiddle Demo.

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