CSS 动画进度条从下往上运行

Question

我有这个 CSS 动画，进度条从屏幕顶部运行到底部我想反转它以便它从屏幕底部运行到顶部。

.meter9 {
  position: absolute;
  left: 80%;
  top: 0%;
  width: 5%;
  height: 100%;
  overflow: hidden;
  background-color: transparent;
}

.meter9 span {
  display: block;
  height: 100%;
}

.progress9 {
  background-color: #d6185e;
  animation: progressBar1 3s ease-in-out;
  animation-fill-mode: forwards;
}

@keyframes progressBar1 {
  0% {
    height: 0;
  }
  100% {
    height: 100%;
  }
}

<div class="meter9">
  <span style="width:100%;"><span class="progress9"></span></span>
</div>

Answer 1

设置：

position: absolute;
bottom: 0;
width: 100%;

到 .meter9 跨度，所以它会在底部，然后会增长到顶部。

.meter9 { 
  top:0%;
  left: 80%;
  width: 5%;
  height: 100%;
  position: absolute;
   overflow: hidden;
   background-color: transparent;
}

.meter9 span {
  display: block;
  height: 100%;
  position: absolute;
  bottom: 0;
  width: 100%;
}

.progress9 {
  background-color: #d6185e;
  animation: progressBar1 3s ease-in-out;
  animation-fill-mode:forwards; 
}

@keyframes progressBar1 {
  0% { height: 0; }
  100% { height: 100%; }
}

<div class="meter9">
    <span style="width:100%;"><span class="progress9"></span></span>
</div>

Answer 2

我建议使用 display: flex; + align-items: flex-end; 然后将项目放置在容器的末尾。您还可以使用这种方法轻松创建多个 进度条 。请参阅下面的示例。

.meter {
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  display: flex; /*flexbox*/
  align-items: flex-end; /*bottom to top*/
}

.progress {
  flex: 1; /*grow*/
  animation: progressBar ease-in-out forwards;
}

.progress:nth-child(1) {
  background-color: #ff6b6b;
  animation-duration: 1s;
}

.progress:nth-child(2) {
  background-color: #51cf66;
  animation-duration: 2s;
}

.progress:nth-child(3) {
  background-color: #339af0;
  animation-duration: 3s;
}

@keyframes progressBar {
  0% {
    height: 0;
  }
  100% {
    height: 100%;
  }
}

<div class="meter">
  <span class="progress"></span>
  <span class="progress"></span>
  <span class="progress"></span>
</div>

CSS 动画进度条从下往上运行

CSS animation progress bar runs from bottom to top

html

css

keyframe

css-animations