为什么在具有范围样式的Vue组件中破坏了CSS关键帧动画?

Pie*_*her 5 javascript css css-animations vue.js vuejs2

我正在尝试在Vue中实现CSS类型指示器。没有Vue,它看起来像这样:

.typing-indicator {
  background-color: #E6E7ED;
  width: auto;
  border-radius: 50px;
  padding: 20px;
  display: table;
  margin: 0 auto;
  position: relative;
  -webkit-animation: 2s bulge infinite ease-out;
          animation: 2s bulge infinite ease-out;
}
.typing-indicator:before, .typing-indicator:after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: -2px;
  height: 20px;
  width: 20px;
  border-radius: 50%;
  background-color: #E6E7ED;
}
.typing-indicator:after {
  height: 10px;
  width: 10px;
  left: -10px;
  bottom: -10px;
}
.typing-indicator span {
  height: 15px;
  width: 15px;
  float: left;
  margin: 0 1px;
  background-color: #9E9EA1;
  display: block;
  border-radius: 50%;
  opacity: 0.4;
}
.typing-indicator span:nth-of-type(1) {
  -webkit-animation: 1s blink infinite 0.3333s;
          animation: 1s blink infinite 0.3333s;
}
.typing-indicator span:nth-of-type(2) {
  -webkit-animation: 1s blink infinite 0.6666s;
          animation: 1s blink infinite 0.6666s;
}
.typing-indicator span:nth-of-type(3) {
  -webkit-animation: 1s blink infinite 0.9999s;
          animation: 1s blink infinite 0.9999s;
}

@-webkit-keyframes blink {
  50% {
    opacity: 1;
  }
}

@keyframes blink {
  50% {
    opacity: 1;
  }
}
@-webkit-keyframes bulge {
  50% {
    -webkit-transform: scale(1.05);
            transform: scale(1.05);
  }
}
@keyframes bulge {
  50% {
    -webkit-transform: scale(1.05);
            transform: scale(1.05);
  }
}
html {
  display: table;
  height: 100%;
  width: 100%;
}

body {
  display: table-cell;
  vertical-align: middle;
}
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<div class="typing-indicator">
  <span></span>
  <span></span>
  <span></span>
</div>
Run Code Online (Sandbox Code Playgroud)

–来源:http//jsfiddle.net/Arlina/gtttgo93/

问题在于,将scoped属性添加到组件的样式定义(<style lang="scss" scoped>)时动画不起作用。我认为这可能与应该在全局范围内声明的关键帧有关。

具有元素的元素.typing-indicator位于具有范围样式的组件的模板中。

有谁知道在使关键帧动画正常工作时如何允许我的组件具有范围化样式?

Win*_*ing 6

问题

问题在于Vue的Webpack加载器(vue-loader)如何在将ID添加到作用域选择器和其他标识符时错误地解析动画名称。这很重要,因为vue-loader的CSS作用域使用添加到元素的唯一属性来复制CSS作用域的行为。虽然关键帧名称会附加ID,但在作用域样式中的动画规则中不会引用关键帧。

您的CSS:

@-webkit-keyframes blink {
  50% {
    opacity: 1;
  }
}

@keyframes blink {
  50% {
    opacity: 1;
  }
}
@-webkit-keyframes bulge {
  50% {
    -webkit-transform: scale(1.05);
            transform: scale(1.05);
  }
}
@keyframes bulge {
  50% {
    -webkit-transform: scale(1.05);
            transform: scale(1.05);
  }
}

.typing-indicator {
  ...
  -webkit-animation: 2s bulge infinite ease-out;
          animation: 2s bulge infinite ease-out;
}

.typing-indicator span:nth-of-type(1) {
  -webkit-animation: 1s blink infinite 0.3333s;
          animation: 1s blink infinite 0.3333s;
}
.typing-indicator span:nth-of-type(2) {
  -webkit-animation: 1s blink infinite 0.6666s;
          animation: 1s blink infinite 0.6666s;
}
.typing-indicator span:nth-of-type(3) {
  -webkit-animation: 1s blink infinite 0.9999s;
          animation: 1s blink infinite 0.9999s;
}
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应该转换为:

@-webkit-keyframes blink-data-v-xxxxxxxx {
  50% {
    opacity: 1;
  }
}

@keyframes blink-data-v-xxxxxxxx {
  50% {
    opacity: 1;
  }
}
@-webkit-keyframes bulge-data-v-xxxxxxxx {
  50% {
    -webkit-transform: scale(1.05);
            transform: scale(1.05);
  }
}
@keyframes bulge-data-v-xxxxxxxx {
  50% {
    -webkit-transform: scale(1.05);
            transform: scale(1.05);
  }
}

.typing-indicator {
  ...
  -webkit-animation: 2s bulge-data-v-xxxxxxxx infinite ease-out;
          animation: 2s bulge-data-v-xxxxxxxx infinite ease-out;
}

.typing-indicator span:nth-of-type(1) {
  -webkit-animation: 1s blink-data-v-xxxxxxxx infinite 0.3333s;
          animation: 1s blink-data-v-xxxxxxxx infinite 0.3333s;
}
.typing-indicator span:nth-of-type(2) {
  -webkit-animation: 1s blink-data-v-xxxxxxxx infinite 0.6666s;
          animation: 1s blink-data-v-xxxxxxxx infinite 0.6666s;
}
.typing-indicator span:nth-of-type(3) {
  -webkit-animation: 1s blink-data-v-xxxxxxxx infinite 0.9999s;
          animation: 1s blink-data-v-xxxxxxxx infinite 0.9999s;
}
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但是,它只能转换为:

@-webkit-keyframes blink-data-v-xxxxxxxx {
  50% {
    opacity: 1;
  }
}

@keyframes blink-data-v-xxxxxxxx {
  50% {
    opacity: 1;
  }
}
@-webkit-keyframes bulge-data-v-xxxxxxxx {
  50% {
    -webkit-transform: scale(1.05);
            transform: scale(1.05);
  }
}
@keyframes bulge-data-v-xxxxxxxx {
  50% {
    -webkit-transform: scale(1.05);
            transform: scale(1.05);
  }
}

.typing-indicator {
  ...
  -webkit-animation: 2s bulge infinite ease-out;
          animation: 2s bulge infinite ease-out;
}

.typing-indicator span:nth-of-type(1) {
  -webkit-animation: 1s blink infinite 0.3333s;
          animation: 1s blink infinite 0.3333s;
}
.typing-indicator span:nth-of-type(2) {
  -webkit-animation: 1s blink infinite 0.6666s;
          animation: 1s blink infinite 0.6666s;
}
.typing-indicator span:nth-of-type(3) {
  -webkit-animation: 1s blink infinite 0.9999s;
          animation: 1s blink infinite 0.9999s;
}
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需要注意的是:在实际的转换中,动画规则中对关键帧名称的引用-data-v-xxxxxxxx最后缺少。这是错误。

当前(从47c3317开始),速记动画规则声明中的动画名称是通过从将动画规则除以任何空白字符[1]中获取第一个值来标识的。但是,animation属性的形式定义指出,动画名称可以出现在规则定义内的任何位置。

<single-animation> = <time> || <single-timing-function> || <time> || <single-animation-iteration-count> || <single-animation-direction> || <single-animation-fill-mode> || <single-animation-play-state> || [ none | <keyframes-name> ]

animation形式语法[2]

因此,虽然动画声明有效,但vue-loader无法解析它。

解决方法

当前的解决方法是将动画名称移动到动画规则声明的开头。您的关键帧声明不需要更改,它们保留在作用域样式表中。您的动画声明现在应如下所示:

.typing-indicator {
  ...
  -webkit-animation: bulge 2s infinite ease-out;
          animation: bulge 2s infinite ease-out;
}
.typing-indicator span:nth-of-type(1) {
  -webkit-animation: blink 1s infinite 0.3333s;
          animation: blink 1s infinite 0.3333s;
}
.typing-indicator span:nth-of-type(2) {
  -webkit-animation: blink 1s infinite 0.6666s;
          animation: blink 1s infinite 0.6666s;
}
.typing-indicator span:nth-of-type(3) {
  -webkit-animation: blink 1s infinite 0.9999s;
          animation: blink 1s infinite 0.9999s;
}
Run Code Online (Sandbox Code Playgroud)

参考文献