CSS3 implements carousel animation code

Simple implementation of carousel animation

Today's front-end pays more and more attention to user interaction and experience. There are many animations and effects that are very common, such as the topic of this article: carousel animation. This has the same effect as a term often heard before - "marquee". Before CSS3 came out, animations were all implemented through JavaScript. Now we can completely use CSS3, the performance has been greatly improved, and the compatibility is also very good, especially on the mobile terminal.

CSS3 animation performance will be greatly improved, especially when there are many animations or timers on the page.

html structure:

    <h2>CSS实现</h2>
    <p class="wrapper-css">
        <p class="container-css marquee">
            <p>今天</p>
            <p>明天</p>
            <p>后天</p>
            <p>今天</p><!-- 辅助元素，为实现循环轮播 -->
        </p>
    </p>

As you can see, you still need to add a repeating auxiliary element at the end to achieve the looping effect.

CSS code:

    // 轮播动画
        @-webkit-keyframes marquee {
            0% {
                -webkit-transform: translate3d(0, 0, 0);
            }
            27% {
                -webkit-transform: translate3d(0, 0, 0);
            }
            33% {
                -webkit-transform: translate3d(0, -100%, 0);
            }
            60% {
                -webkit-transform: translate3d(0, -100%, 0);
            }
            67% {
                -webkit-transform: translate3d(0, -200%, 0);
            }
            94% {
                -webkit-transform: translate3d(0, -200%, 0);
            }
            100% {
                -webkit-transform: translate3d(0, -300%, 0);
            }
        }
        @keyframes marquee {
            0% {
                transform: translate3d(0, 0, 0);
            }
            /* 100/3 * (2s/2.5s) => 26.7% => 27% */
            27% {
                transform: translate3d(0, 0, 0);
            }
            /* 100/3 =>33.3 => 33% */
            33% {
                transform: translate3d(0, -100%, 0);
            }
            60% {
                transform: translate3d(0, -100%, 0);
            }
            67% {
                transform: translate3d(0, -200%, 0);
            }
            94% {
               transform: translate3d(0, -200%, 0);
            }
            100% {
                transform: translate3d(0, -300%, 0);
            }
        }
        .wrapper-css {
            width: 200px;
            height: 30px;
            margin: 10px;
            overflow: hidden;
        }

        .container-css {
            height: 30px;
            -webkit-animation: marquee 7.5s linear infinite;/* 2.5s(2s + 0.5s) * 3 => 7.5s */
            animation: marquee 7.5s linear infinite;
        }
        .container-css p {
            width: 100%;
            height: 30px;
            margin: 0;
            line-height: 30px;
            font-size: 18px;
        }

As above, we use CSS3 to define animation key frames, and combine it with transform displacement to achieve seamless carousel animation, and achieve carousel effects by moving containers , mainly need to calculate animation key frame points based on carousel elements

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