问题

In my website I want to have a header that fades in and out, then in with different text, then out, then back to normal (looped). Here's how I would like it to work:

h1 {
    font-size: 600%;
    animation-name: head;
    animation-duration: 4s;
    animation-iteration-count: infinite;
}
@keyframes head {
0% {font-size:600%; opacity:1;}
25% {font-size:570%; opacity:0;}
50% {font-size:600%; opacity:1;}
65% {font-size:570%; opacity:0;}
80% {font-size:600%; opacity:1; innerHtml="Changed Text"}
90% {font-size:570%; opacity:0;}
100% {font-size:600%;opacity:1; innerHtml="Original Text"}
}

However, I haven't found any way to change the text within a CSS3 animation. Is this possible?

回答1:

There's two ways you could do this. One is to have the content managed by a pseudo element. This means that the displayed content would be applied inside CSS; like this:

CSS

h1:before{
    content: 'Original Text';
    font-size: 600%;
    animation-name: head;
    animation-duration: 4s;
    animation-iteration-count: infinite;
}

@keyframes head {
    0% {font-size:600%; opacity:1;}
    25% {font-size:570%; opacity:0;}
    50% {font-size:600%; opacity:1;}
    65% {font-size:570%; opacity:0;}
    80% {font-size:600%; opacity:1; content: "Changed Text"}
    90% {font-size:570%; opacity:0;}
    100% {font-size:600%;opacity:1; content: "Original Text"}
}

The other way you could do this is by having two elements in the HTML and toggling between them. You'd need two animations to be working together to do this or you might be able to just offset one animation, like this:

HTML

<header>
    <h1 class="headtext" id="text1">Original Text</h1>
    <h1 class="headtext" id="text2">Changed Text</h1>
</header>

CSS

.headtext{
    font-size: 600%;
    animation-name: head;
    animation-duration: 4s;
    animation-iteration-count: infinite;
}

#text2{
    animation-delay: 2s;
}

@keyframes head {
    0% {font-size:600%; opacity:1;}
    50% {font-size:0; opacity:0;}
    100% {font-size:600%;opacity:1;}
}

I've reduced the font-size to 0 to give room for the other text to come in. This may be a different effect than you might want though.

回答2:

Hour ago, been stuck with same question but my decision is this. Just pasted a part of my own code. Check it out, guys!

body {
	margin: 0;
	font-family: sans-serif;
}

#wrapper {
	background-color: #051E3E;
	height: 100vh;
	color: white;
	display: flex;
	justify-content: center;
	align-items: center;
}

#hi {
	animation: pulse 5s;
}

@keyframes pulse {
	0% {
	color: #051E3E;
	}
	10% {
		color: #051E3E;
	}
	30% {
		color: white;
	}
	50% {
		color: #051E3E;
	}
	60% {
		color: #051E3E;
	}
	80% {
		color: white;
	}
	100% {
		color: #051E3E;
	}
}

#hi:after {
	content: "";
	animation: spin 5s linear;
}

@keyframes spin {
  0% { content:"Hi"; }
  100% { content:"How do you like it?"; }
}

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
	<link rel="stylesheet" type="text/css" href="style.css">
</head>
<body>
	
	<div id="wrapper">
		<p id="hi"></p>
	</div>
	
</body>
</html>

回答3:

So I came across this question looking to find a solution, I had a caveat where I couldn't change the text with content: ''; So I came up with the below:

@keyframes fade-out-fade-in {
  0% {
    opacity: 1;
  }

  10% {
    opacity: 1;
  }

  20% {
    opacity: 1;
  }

  30% {
    opacity: 1;
  }

  40% {
    opacity: 1;
  }

  50% {
    opacity: 0;
  }

  60% {
    opacity: 0;
  }

  70% {
    opacity: 0;
  }

  80% {
    opacity: 0;
  }

  90% {
    opacity: 0;
  }

  100% {
    opacity: 1;
  }
}

@keyframes fade-in-fade-out {
  0% {
    opacity: 0;
  }
  10% {
    opacity: 0;
  }
  20% {
    opacity: 0;
  }
  30% {
    opacity: 0;
  }
  40% {
    opacity: 0;
  }
  50% {
    opacity: 1;
  }
  60% {
    opacity: 1;
  }
  70% {
    opacity: 1;
  }
  80% {
    opacity: 1;
  }
  90% {
    opacity: 1;
  }
  100% {
    opacity: 0;
  }
}

Then used:

animation: fade-in-fade-out 20s linear infinite both;

and for second text

animation: fade-out-fade-in 20s linear infinite both;

where needed.

Hope this helps someone in the future.

来源：https://stackoverflow.com/questions/42236440/change-text-with-a-css3-animation

标签

html

css

css3

css-animations

Change text with a CSS3 animation?

问题

回答1:

CSS

HTML

CSS

回答2:

回答3: