文本 slider 使用关键帧 animation

Question

I have a slider which contains 3 items, in which everything works good as I want

here is live demo working demo

Text slider with 3 items

HTML

    <span class="item-1">FAST.</span>
    <span class="item-2">SIMPLE.</span>
    <span class="item-3">PERSONAL.</span>

Css

body {
  font-family: 'Open Sans', 'sans-serif';
  color: #cecece;
  background: #222;
  overflow: hidden;
}

.item-1,
.item-2,
.item-3 {
  position: absolute;
  display: block;
  top: 2em;
  width: 60%;
  font-size: 2em;
  animation-duration: 20s;
  animation-timing-function: ease-in-out;
  animation-iteration-count: infinite;
}

.item-1 {
  animation-name: anim-1;
}

.item-2 {
  animation-name: anim-2;
}

.item-3 {
  animation-name: anim-3;
}

@keyframes anim-1 {
  0%,
  8.3% {
    top: -100%;
    opacity: 0;
  }
  8.3%,
  25% {
    top: 25%;
    opacity: 1;
  }
  33.33%,
  100% {
    top: 110%;
    opacity: 0;
  }
}

@keyframes anim-2 {
  0%,
  33.33% {
    top: -100%;
    opacity: 0;
  }
  41.63%,
 58.29%  {
    top: 25%;
    opacity: 1;
  }
  66.66%,
  100% {
    top: 110%;
    opacity: 0;
  }
}

@keyframes anim-3 {
  0%,
  66.66% {
    top: -100%;
    opacity: 0;
  }
  74.96%,
  91.62% {
    top: 25%;
    opacity: 1;
  }
  100% {
    top: 110%;
    opacity: 0;
  }
}

Now I want to two more items to the slider

HTML

        <span class="item-1">FAST.</span>
        <span class="item-2">SIMPLE.</span>
        <span class="item-3">PERSONAL.</span>
        <span class="item-4">SOCIAL.</span>             
        <span class="item-5">LOUD.</span>  

Css

body {
  font-family: 'Open Sans', 'sans-serif';
  color: #cecece;
  background: #222;
  overflow: hidden;
}

.item-1,
.item-2,
.item-3,
.item-4,
.item-5{
  position: absolute;
  display: block;
  top: 2em;
  width: 60%;
  font-size: 2em;
  animation-duration: 20s;
  animation-timing-function: ease-in-out;
  animation-iteration-count: infinite;
}

.item-1 {
  animation-name: anim-1;
}

.item-2 {
  animation-name: anim-2;
}

.item-3 {
  animation-name: anim-3;
}
.item-4{
    animation-name: anim-4;
}
.item-5{
    animation-name: anim-5;
}

@keyframes anim-1 {
  0%,
  6.3% {
    top: -100%;
    opacity: 0;
  }
  6.3%,
  25% {
    top: 25%;
    opacity: 1;
  }
  13.33%,
  100% {
    top: 110%;
    opacity: 0;
  }
}

@keyframes anim-2 {
  0%,
  23.33% {
    top: -100%;
    opacity: 0;
  }

  31.63%,
  48.29% {
    top: 25%;
    opacity: 1;
  }

  56.66%,
  100% {
    top: 110%;
    opacity: 0;
  }

}

@keyframes anim-3 {
  0%,
  56.66% {
    top: -100%;
    opacity: 0;
  }
  64.96%,
  71.62% {
    top: 25%;
    opacity: 1;
  }
  100% {
    top: 110%;
    opacity: 0;
  }
}

@keyframes anim-4 {
  0%,
  71.66% {
    top: -100%;
    opacity: 0;
  }
  84.96%,
  91.62% {
    top: 25%;
    opacity: 1;
  }
  100% {
    top: 110%;
    opacity: 0;
  }
}

@keyframes anim-5 {
  0%,
  84.96% {
    top: -100%;
    opacity: 0;
  }

  94.96%,
  91.62% {
    top: 25%;
    opacity: 1;
  }

  100% {
    top: 110%;
    opacity: 0;
  }
}

Here is demo with five items

not working demo

What do I need to change in my code?

Answer 1

The problem is due to messed up percentage on the five different animations.

Why not re-use the same animation, something like:

@keyframes anim {
  0%, 33.33% {
    top: -100%;
    opacity: 0;
  }
  33.33%, 50% {
    top: 25%;
    opacity: 1;
  }
  50%, 100% {
    top: 110%;
    opacity: 0;
  }
}

and then apply an animation-delay on each span , something like:

.item-1 { animation-delay: 0s }
.item-2 { animation-delay: 4s }
.item-3 { animation-delay: 8s }
.item-4{ animation-delay: 12s }
.item-5{ animation-delay: 16s }

Here is a working example.

Tip keep in mind that animating top value is not the best choice in terms of performance. Try always to animate transform and opacity values when possible.

Answer 2

 body { font-family: 'Open Sans', 'sans-serif'; color: #cecece; background: #222; overflow: hidden; }.item-1, .item-2, .item-3, .item-4, .item-5{ position: absolute; display: block; top: -100%; width: 60%; opacity: 0; font-size: 2em; animation-duration: 15s; animation-timing-function: ease-in-out; animation-iteration-count: infinite; animation-name: anim-all; }.item-1 { animation-delay: 0s }.item-2 { animation-delay: 3s }.item-3 { animation-delay: 6s }.item-4{ animation-delay: 9s }.item-5{ animation-delay: 12s } @keyframes anim-all { 0%, 33.33% { top: -100%; opacity: 0; } 33.33%, 50% { top: 25%; opacity: 1; } 50%, 100% { top: 110%; opacity: 0; } }

 <body> <span class="item-1">FAST.</span> <span class="item-2">SIMPLE.</span> <span class="item-3">PERSONAL.</span> <span class="item-4">SOCIAL.</span> <span class="item-5">LOUD.</span> </body>

 body { font-family: 'Open Sans', 'sans-serif'; color: #cecece; background: #222; overflow: hidden; }.item-1, .item-2, .item-3, .item-4, .item-5{ position: absolute; display: block; top: -100%; width: 60%; opacity: 0; font-size: 2em; animation-duration: 20s; animation-timing-function: ease-in-out; animation-iteration-count: infinite; animation-name: anim-all; }.item-1 { animation-delay: 0s }.item-2 { animation-delay: 4.25s }.item-3 { animation-delay: 8.50s }.item-4{ animation-delay: 12.75s }.item-5{ animation-delay: 17s } @keyframes anim-all { 0%, 33.33% { top: -100%; opacity: 0; } 33.33%, 50% { top: 25%; opacity: 1; } 50%, 100% { top: 110%; opacity: 0; } }

 <body> <span class="item-1">FAST.</span> <span class="item-2">SIMPLE.</span> <span class="item-3">PERSONAL.</span> <span class="item-4">SOCIAL.</span> <span class="item-5">LOUD.</span> </body>