如何实现多行文本加载动画? [英] How can I achieve a text loading animation over multiple lines?

问题描述

我正在尝试仅使用 CSS 来实现文本加载动画.我所拥有的是黑色文本，那么当页面加载时，文本将在几秒钟内开始用红色填充.

I'm trying to implement a text loading animation using only CSS. what I have is a text with black color, then when the page loads the text will fill start filling with a red color over several seconds.

我面临的问题是，加载文本的动画工作正常，但是当文本结束并以新行开头时，动画文本仍将继续在同一行上.

The issue I'm facing is that the text loading animation is working fine, but when the text ends and begins with a new line the animation text still continues on the same line.

我该如何解决?

body {
  background: #3498db;
  font-family: sans-serif;
}

h1 {
  position: relative;
  color: rgba(0, 0, 0, .3);
  font-size: 5em;
  white-space: wrap;
}

h1:before {
  content: attr(data-text);
  position: absolute;
  overflow: hidden;
  max-width: 100%;
  white-space: nowrap;
  word-break: break-all;
  color: #fff;
  animation: loading 8s linear;
}

@keyframes loading {
  0% {
    max-width: 0;
  }
}

<h1 data-text="Suspendisse mollis dolor vitae porta egestas. Nunc nec congue odio.">Suspendisse mollis dolor vitae porta egestas. Nunc nec congue odio.</h1>

推荐答案

一个想法是考虑对 inline 元素应用 background-clip:text 进行渐变着色.

An idea is to consider gradient coloration with background-clip: text applied to an inline element.

body {
  background: #3498db;
  font-family: sans-serif;
}

h1 {
  font-size: 5em;
}

h1 span {
  background:
    linear-gradient(#fff,#fff) left no-repeat
    rgba(0, 0, 0, .3);
  background-size:0% 100%;
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  animation:loading 5s forwards linear;
}

@keyframes loading {
  to {
    background-size:100% 100%;
  }
}

<h1><span>Suspendisse mollis dolor vitae porta egestas. Nunc nec congue odio.</span></h1>

为了更好地理解它的工作原理，下面是一个基本示例，您可以在其中查看内联元素在背景色下的行为以及它与块级元素的区别:

To better understand how it works, here is a basic example where you can see how inline element behave with background coloration and how its different from block level element:

.color {
  font-size: 1.5em;
  line-height: 1.5em;
  border: 2px solid;
  background: linear-gradient(red, red) left no-repeat;
  background-size: 0% 100%;
  animation: change 5s linear forwards;
}

@keyframes change {
  100% {
    background-size: 100% 100%
  }
}

<span class="color">
 lorem ipsume lorem ipsume lorem ipsume lorem ipsume lorem ipsume lorem ipsume lorem ipsume lorem ipsume lorem ipsume 
</span>
<div class="color">
  lorem ipsume lorem ipsume lorem ipsume lorem ipsume lorem ipsume lorem ipsume lorem ipsume lorem ipsume lorem ipsume
</div>

我只是使用 background-clip:text 来应用相同的逻辑来为文本而非背景着色:

I simply apply the same logic using background-clip:text to color the text instead of the background:

.color {
  font-size: 1.5em;
  line-height: 1.5em;
  border: 2px solid;
  background: linear-gradient(red, red) left no-repeat;
  background-size: 0% 100%;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  color: transparent;
  animation: change 5s linear forwards;
}

@keyframes change {
  100% {
    background-size: 100% 100%
  }
}

<span class="color">
 lorem ipsume lorem ipsume lorem ipsume lorem ipsume lorem ipsume lorem ipsume lorem ipsume lorem ipsume lorem ipsume 
</span>
<div class="color">
  lorem ipsume lorem ipsume lorem ipsume lorem ipsume lorem ipsume lorem ipsume lorem ipsume lorem ipsume lorem ipsume
</div>

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