如何修改CSS文本影片

我發現了一個出色的 CSS 影片，它在我正在處理的選單上看起來很棒。影片首先顯示一個 div 中的文本，幾秒鐘后顯示另一個 div 中的文本。再過幾秒鐘，兩個div中的文字就消失了。然后影片在重復。

我正在嘗試使用類創建兩個 div（以便可以使用 javascript 函式呼叫它們）。第一個 div 應該運行顯示兩個文本的影片部分。另一個 div 是兩個文本消失的影片。這兩個影片應該只運行一次。如何才能做到這一點？

代碼筆：https ://codepen.io/Atise/pen/YzQorxw

<div class="PrSidenav">
  <div class="animation_container">
    <div class="first_animation">First part of the menu</div>
    <div class="second_animation">
      <span>Second part of the menu</span>
    </div>
  </div>

  <div class="animation_container">
    <div class="first_animation">First part of the menu</div>
    <div class="second_animation">
      <span>Second part of the menu</span>
    </div>
  </div>

  <div class="animation_container">
    <div class="first_animation">First part of the menu</div>
    <div class="second_animation">
      <span>Second part of the menu</span>
    </div>
  </div>

  <div class="animation_container">
    <div class="first_animation">First part of the menu</div>
    <div class="second_animation">
      <span>Second part of the menu</span>
    </div>
  </div>

  <div class="animation_container">
    <div class="first_animation">First part of the menu</div>
    <div class="second_animation">
      <span>Second part of the menu</span>
    </div>
  </div>

  <div class="animation_container">
    <div class="first_animation">First part of the menu</div>
    <div class="second_animation">
      <span>Second part of the menu</span>
    </div>
  </div>
</div>

<style>

body {
  background: white;
  color: #555;
  font-family: "Roboto";
  font-weight: 300;
  font-size: 32px;
  padding-top: 40vh;
  height: 100vh;
  overflow: hidden;
}

.theSidenav {
  width: 20vw !important;
}

.animation_container {
  width: 14vw;
  display: grid;
  grid-template-columns: 16vw 10vw;
  grid-gap: 10px;
}

.first_animation {
  padding-right: 0;
  margin-right: 0;
}

.first_animation,
.second_animation {
  overflow: hidden;

  /* white-space:nowrap; */
}

.first_animation {
  animation: showup 7s forwards;
}

.second_animation {
  width: 0px;
  animation: reveal 7s forwards;
}

.second_animation span {
  margin-left: -355px;
  animation: slidein 7s forwards;
}

@keyframes showup {
  0% {
    opacity: 0;
  }
  20% {
    opacity: 1;
  }
  80% {
    opacity: 1;
  }
  100% {
    opacity: 1;
  }
}

@keyframes slidein {
  0% {
    margin-left: -800px;
  }
  20% {
    margin-left: -800px;
  }
  35% {
    margin-left: 0px;
  }
  100% {
    margin-left: 0px;
  }
}

@keyframes reveal {
  0% {
    opacity: 1;
    width: 0px;
  }
  20% {
    opacity: 1;
    width: 0px;
  }
  30% {
    width: 355px;
  }
  80% {
    opacity: 1;
  }
  100% {
    opacity: 1;
    width: 355px;
  }
}

p {
  font-size: 12px;
  color: #999;
  margin-top: 200px;
}
</style>

uj5u.com熱心網友回復：

將無限更改為 1，影片將只運行一次

uj5u.com熱心網友回復：

我自己解決了，經過一些反復試驗！

https://codepen.io/Atise/pen/YzQorxw

HTML

<div class="first_animation">First part of the menu</div> 
<div class="second_animation"> 
  <span>Second part of the menu</span>
</div>

CSS

@import url("https://fonts.googleapis.com/css?family=Roboto:300");

body {
  background: white;
  color: #555;
  font-family: "Roboto";
  font-weight: 300;
  font-size: 32px;
  padding-top: 40vh;
  height: 100vh;
  overflow: hidden;
}

.thePrSidenav {
  width: 20vw !important;
}

.animation_container {
  width: 14vw;
  display: grid;
  grid-template-columns: 16vw 10vw;
  grid-gap: 10px;
}

.first_animation {
  padding-right: 0;
  margin-right: 0;
}

.first_animation,
.second_animation {
  overflow: hidden;

  /* white-space:nowrap; */
}

.first_animation {
  animation: showup 7s forwards;
}

.second_animation {
  width: 0px;
  animation: reveal 7s forwards;
}

.second_animation span {
  margin-left: -355px;
  animation: slidein 7s forwards;
}

@keyframes showup {
  0% {
    opacity: 0;
  }
  20% {
    opacity: 1;
  }
  80% {
    opacity: 1;
  }
  100% {
    opacity: 1;
  }
}

@keyframes slidein {
  0% {
    margin-left: -800px;
  }
  20% {
    margin-left: -800px;
  }
  35% {
    margin-left: 0px;
  }
  100% {
    margin-left: 0px;
  }
}

@keyframes reveal {
  0% {
    opacity: 1;
    width: 0px;
  }
  20% {
    opacity: 1;
    width: 0px;
  }
  30% {
    width: 355px;
  }
  80% {
    opacity: 1;
  }
  100% {
    opacity: 1;
    width: 355px;
  }
}

p {
  font-size: 12px;
  color: #999;
  margin-top: 200px;
}

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