In this article we will use CSS to animate transparency changes and obtain fade-in and fade-out effects.
To implement animation of transparency changes in CSS, you need to use the transition attribute. Since the transition attribute is a new attribute in CSS3, it is necessary to add a prefix when running on some supported browsers.
Like Chrom, Safari is written as "-webkit-transition", FireFox is written as "-moz-transition", Internet Explorer is written as "-ms-transition", and Opera is written as "-o-transition" ; If it is a recent web browser (Internet Explorer 11, Microsoft Edge), use the "transition" attribute directly without prefixing it. (Related recommendations: CSS3 Online Manual)
Syntax:
transition: all [变化时间];
For [change time], specify the time of animation change
Example :
The following example is animated within 3 seconds.
transition: all 3s;
The code example is as follows:
Create the following HTML file.
fade.html
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title></title>
<link rel="stylesheet" href="fade.css" />
<meta charset="utf-8" />
<script type="text/javascript">
function FadeOutLinkClick() {
var frame = document.getElementById("FadeOutDivFrame");
frame.className = "FadeOutFrame fadeout";
}
function FadeInLinkClick() {
var frame = document.getElementById("FadeInDivFrame");
frame.className = "FadeInFrame fadein";
}
</script>
</head>
<body>
<div id="FadeOutDivFrame" class="FadeOutFrame">按钮。</div>
<a id="fadeout" href="javascript:void(0);" onclick="FadeOutLinkClick();">淡出</a>
<hr/>
<div id="FadeInDivFrame" class="FadeInFrame">框架。</div>
<a id="fadeout" href="javascript:void(0);" onclick="FadeInLinkClick();">淡入</a>
</body>
</html>fade.css
.FadeOutFrame {
width: 320px;
height: 180px;
background-color: #abffe8;
border: 1px solid #0067aa;
opacity: 1;
}
.FadeOutFrame.fadeout{
-webkit-transition: all 1.5s;
-moz-transition: all 1.5s;
-ms-transition: all 1.5s;
-o-transition: all 1.5s;
transition: all 1.5s;
opacity: 0;
}
.FadeInFrame {
width: 320px;
height: 180px;
background-color: #ffd3d3;
border: 1px solid #b50042;
opacity: 0;
}
.FadeInFrame.fadein{
-webkit-transition: all 1.5s;
-moz-transition: all 1.5s;
-ms-transition: all 1.5s;
-o-transition: all 1.5s;
transition: all 1.5s;
opacity: 1;
}Description: Change the category of the "FadeOutDivFrame" box from "FadeOutFrame" when clicking the "Fade Out" link The transition attribute and opacity: 0; are set for "FadeOutFrame fadeout" and "FadeOutFrame fadeout". Because the transition attribute and opacity: 0; have been set, it fades out to a transparent animation.
The effect is as follows:
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