CSS:在悬停时替换文本,但平滑过渡到新文本不起作用?

CSS: Replacing a text on hover, but smooth transition to the new text does not work?(CSS:在悬停时替换文本,但平滑过渡到新文本不起作用?)

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问题描述

场景:

如果用户将鼠标悬停在文本(例如 h1 标记)上,它应该会更改为新文本.新文本应该看起来很流畅.

If a user hovers over a text (e.g. an h1-tag), it should change to a new text. The new text should appear smoothly.

到目前为止我做了什么:

我能够用display:none"和content: 'This is the new text'"属性替换一个新文本.我的问题是新文本出现不流畅(它不会淡入/过渡).我也尝试过使用不透明度,但它不会替换我的旧文本(相反,它只是消失了,新文本出现在它旁边).

I was able to replace a text with a new one with the "display:none" and the "content: 'This is the new text' "-property. My problem is that the new text does not appear smoothly (it does not fade in/transitions). I've also tried to use opacity, but it doesn't replace my old text (instead it just disappears and the new text appears next to it).

这是一个 JSFiddle 和代码片段:

Here is a JSFiddle and code snippet:

.my_div {
  background-color: red;
}
.my_div:hover {
  background-color: green;
  transition: all 500ms ease-in-out;
}
.my_div:hover .title span {
  display: none;
}
.my_div:hover .title:after {
  content: "A wild text appears";
}

<div class="my_div">
  <h1 class="title"><span>This is the old text</span></h1>
</div>

推荐答案

这是一个非常简单的示例

Here is a really simple sample

(这个隐藏片段使用伪元素而不是可见的内部 div's)

(This hidden snippet use pseudo elements instead of the visible's inner div's)

div, div:after, div:before {
    height: 100px;
    width: 100px;
    position: absolute;
    font-size: 40px;
    color: black
}

div:after {
    content: "New";
    opacity: 0;
}
div:before {
    content: "Old";
    opacity: 1;
}

div:after, div:before {
    transition: opacity 0.5s linear;
}

.wrap:hover:before {
    opacity: 0;
}
.wrap:hover:after {
    opacity: 1;
}

<div class="wrap">
</div>

div {
    height: 100px;
    width: 100px;
    position: absolute;
    font-size: 40px;
    color: black
}

.new {
    opacity: 0;
}

.old, .new {
    transition: opacity 0.5s linear;
}

.wrap:hover .old {
    opacity: 0;
}
.wrap:hover .new {
    opacity: 1;
}

<div class="wrap">
<div class="new">New</div>
<div class="old">Old</div>
</div>

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