[JavaScript知识库]Vue ＜transition-group＞ ＜table＞数据滚动显示过渡案例

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<!-- Vue <transition-group> <table>数据滚动显示过渡案例-->
<template>
  <div class="page">
    <!--
    Vue几乎支持所有原生js dom事件
    html dom事件列表：https://www.runoob.com/jsref/dom-obj-event.html
    -->
    <table @mouseover="onMouseOverTable" @mouseout="onMouseOutTable">
      <transition-group name="list-complete" tag="tbody">
        <tr
          v-for="(item,index) in items"
          v-bind:key="item.txt"
          class="list-complete-item"
          v-if="index < 3"
        >
          <!-- 当前只显示 3 条数据 -->
          <td>
            {{ item.txt }}
          </td>
          <td>
            {{ item.num }}
          </td>
        </tr>
      </transition-group>
    </table>

  </div>
</template>

<script>
  export default {
    name: 'HelloWorld',
    data() {
      return {
        items: [
          {txt: 'apple', num: 1},
          {txt: 'banana', num: 2},
          {txt: 'tomatoes', num: 3},
          {txt: 'strawberry', num: 4},
          {txt: 'orange', num: 5},
          {txt: 'grape', num: 6},
        ],
        scrollName: null
      }
    },
    computed: {},
    mounted(){
      this.setScrollAni();
    },
    methods: {
      exchange(){
        let self = this;
        let firstEle = this.items[0];
        this.items.splice(0, 1);
        self.items.splice(self.items.length, 0, firstEle);
      },
      setScrollAni(){
        let self = this;
        if(self.scrollName){
          clearInterval(self.scrollName)
        }
        self.scrollName = setInterval(function () {
          self.exchange();
        },1500)
      },
      onMouseOverTable(){
        let self = this;
        if(self.scrollName){
          clearInterval(self.scrollName)
        }
      },
      onMouseOutTable(){
        this.setScrollAni()
      }
    }
  }
</script>

<!-- Add "scoped" attribute to limit CSS to this component only -->
<style scoped lang="less">

  .list-complete-item {
    transition: all 1s;

    td {
      border-top: 1px solid #ddd;
      padding: 8px;
      width: 150px;
    }
  }
  .list-complete-leave-to
    /* .list-complete-leave-active for below version 2.  1.8 */ {
    opacity: 0;
    transform: translateY(-30px);
  }
  .list-complete-enter
    /* .list-complete-leave-active for below version 2.  1.8 */ {
    opacity: 0;
    transform: translateY(30px);
  }

  .list-complete-leave-active {
    position: absolute;
  }
</style>