Using CSS for fade-in effect on page load

Can CSS Transitions be used to allow a text paragraph to fade-in on page load?

I really like how it looks on http://dotmailapp.com/ and would love to use a similar effect using CSS.

Note: The domain has since been purchased and no longer has the effect mentioned. An archived copy can be viewed on the Wayback Machine.

Illustration

Having this markup:

<div id="test">    
    <p>This is a test</p>
</div>

With the following CSS rule:

#test p {
    opacity: 0;
    margin-top: 25px;
    font-size: 21px;
    text-align: center;
    -webkit-transition: opacity 2s ease-in;
    -moz-transition: opacity 2s ease-in;
    -o-transition: opacity 2s ease-in;
    -ms-transition: opacity 2s ease-in;
    transition: opacity 2s ease-in;
}

How can the transition be triggered on load?

标签： css css3 opacity css-transitions

3条回答

无与为乐者.

2楼-- · 2018-12-31 09:29

Method 1:

If you are looking for a self-invoking transition then you should use CSS3 Animations, they aren't supported as well but this is exactly the kind of thing they were made for.

CSS

#test p {
    margin-top: 25px;
    font-size: 21px;
    text-align: center;

    -webkit-animation: fadein 2s; /* Safari, Chrome and Opera > 12.1 */
       -moz-animation: fadein 2s; /* Firefox < 16 */
        -ms-animation: fadein 2s; /* Internet Explorer */
         -o-animation: fadein 2s; /* Opera < 12.1 */
            animation: fadein 2s;
}

@keyframes fadein {
    from { opacity: 0; }
    to   { opacity: 1; }
}

/* Firefox < 16 */
@-moz-keyframes fadein {
    from { opacity: 0; }
    to   { opacity: 1; }
}

/* Safari, Chrome and Opera > 12.1 */
@-webkit-keyframes fadein {
    from { opacity: 0; }
    to   { opacity: 1; }
}

/* Internet Explorer */
@-ms-keyframes fadein {
    from { opacity: 0; }
    to   { opacity: 1; }
}

/* Opera < 12.1 */
@-o-keyframes fadein {
    from { opacity: 0; }
    to   { opacity: 1; }
}

Demo

http://jsfiddle.net/SO_AMK/VV2ek/

Browser Support

All modern browsers, IE 10+: http://caniuse.com/#feat=css-animation

Method 2:

Alternatively, you can use jQuery (or plain JS, see third code block) to change the class on load:

jQuery

$("#test p").addClass("load");

CSS

#test p {
    opacity: 0;
    font-size: 21px;
    margin-top: 25px;
    text-align: center;

    -webkit-transition: opacity 2s ease-in;
       -moz-transition: opacity 2s ease-in;
        -ms-transition: opacity 2s ease-in;
         -o-transition: opacity 2s ease-in;
            transition: opacity 2s ease-in;
}

#test p.load {
    opacity: 1;
}

Plain JS (not in demo)

document.getElementById("test").children[0].className += " load";

Demo

http://jsfiddle.net/SO_AMK/a9dnW/

Browser Support

All modern browsers, IE 10+: http://caniuse.com/#feat=css-transitions

Method 3:

Or, you can use the method that .Mail uses:

jQuery

$("#test p").delay(1000).animate({ opacity: 1 }, 700);

CSS

#test p {
    opacity: 0;
    font-size: 21px;
    margin-top: 25px;
    text-align: center;
}

Demo

http://jsfiddle.net/SO_AMK/a9dnW/3/

Browser Support

jQuery 1.x: All modern browsers, IE 6+: http://jquery.com/browser-support/
jQuery 2.x: All modern browsers, IE 9+: http://jquery.com/browser-support/

This method is the most cross-compatible as the target browser does not need to support CSS3 transitions or animations.

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初与友歌

3楼-- · 2018-12-31 09:39

In response to @A.M.K's question about how to do transitions without jQuery. A very simple example I threw together. If I had time to think this through some more, I might be able to eliminate the javascript altogether:

<style>
body {
    background-color: red;
    transition: background-color 2s ease-in;
}
</style>
<script>
window.onload = function() {
    document.body.style.backgroundColor = '#00f';
}
</script>
<body>
    <p>test</p>
</body>

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千与千寻千般痛.

4楼-- · 2018-12-31 09:51

You can use the onload="" HTML attribute and use JavaScript to adjust the opacity style of your element.

Leave your CSS as you proposed. Edit your HTML code to:

<body onload="document.getElementById(test).style.opacity='1'">
    <div id="test">
        <p>This is a test</p>
    </div>
</body>

This also works to fade-in the complete page when finished loading:

HTML:

<body onload="document.body.style.opacity='1'">
</body>

CSS:

body{ 
    opacity:0;
    transition: opacity 2s;
    -webkit-transition: opacity 2s; /* Safari */
}

Check the W3Schools website: transitions and an article for changing styles with javascript.

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