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利用vue框架如何做列表循环滚动的展示

来源:恒创科技 编辑:恒创科技编辑部
2024-01-28 04:36:59
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利用vue框架如何做列表循环滚动的展示

功能介绍:

在PC端网页,包括大数据、官网、后台管理平台开发中,可能会用到这种列表循环滚动的展示。

大致需求:

1、列表可以使用数组循环遍历;
2、每隔几秒中列表数据向上滚动一定距离,展示下一条数据;
3、滚动到最后一条数据时重新显示第一条开始的数据(类似走马灯、banner图的循环效果);

整体思路:

1、使用两个定时器嵌套实现;
2、需要两个相同容器存放同样内容,实现无缝衔接效果;

效果展示:

完整代码:

<!DOCTYPE html>
<html>
 <head>
  <meta charset="utf-8">
  <title></title>
  <script src="https://unpkg.com/vue@2.6.14/dist/vue.min.js"></script>
  <style>
   /* 滚动表格最外层 */
   .tableoOut {
    margin: 100px auto;
     width: 500px;
     height: 400px;
    background: pink;
     overflow: hidden;
     display: flex;
     align-items: center;
     justify-content: center;
     flex-direction: column;
   }
   .tableBox {
     width: 100%;
    background: #000;
     overflow: hidden
   }
   .tableTit {
    background: #000;
     width: 100%;
     height: 40px;
     color: #858A84;
     text-align: center;
     display: flex;
     justify-content: center;
     align-items: center;
   }
   .tableInner {
     height: auto;
   }
   .box {
     width: 100%;
     height: 50px;
     display: flex;
     justify-content: center;
     align-items: center;
     color: #fff;
   }
   .box .time {
     color: #858A84;
   }
   .tableoOut .addr, .tableoOut .time, .tableoOut .name {
     box-sizing: border-box;
     padding: 0 5px;text-align: center;
     overflow: hidden;
    white-space: nowrap;
    text-overflow: ellipsis;
   }
   .tableoOut .addr {
     width: calc(100% - 200px);
     flex-shrink: 0;
   }
   .tableoOut .name, .tableoOut .time {
     width: 100px;
     flex-shrink: 0;
   }
  </style>
 </head>
 <body>
  <div id="app">
   <div class="tableoOut" ref="tableoOut">
    <div class="tableTit">
     <div class="name">姓名</div>
     <div class="addr">地址</div>
     <div class="time">入驻时间</div>
    </div>
    <div class="tableBox" ref="tableBox"
     :style="{height: tableHei}">
     <div class="tableInner" ref="tableInner">
      <div class="box" v-for="item in 7" :key="item">
       <div class="name">{{item}}</div>
       <div class="addr">山东省山东省山东省山东省山东省山东省山东省山东省
       山东省山东省山东省山东省山东省</div>
       <div class="time">2022-05-26</div>
      </div>
     </div>
     <div class="tableInner" v-if="size < 7">
      <div class="box" v-for="item in 7" :key="item">
       <div class="name">{{item}}</div>
       <div class="addr">山东省山东省山东省山东省山东省山东省山东省山东省
       山东省山东省山东省山东省山东省</div>
       <div class="time">2022-05-26</div>
      </div>
     </div>
    </div>
   </div>
  </div>
 </body>
 <script>
  new Vue({
   el: '#app',
   data: {
    tableHei: 'auto',
    timer: null,
    size: 0
   },
   mounted() {
    this.getTable();
   },
   methods: {
    getTable() {
     const outHei = this.$refs.tableoOut.clientHeight - 60;
     this.size = Math.floor(outHei / 50);
     this.tableHei = this.size * 50 + 'px';
     this.scrolls();
    },
    stepScroll() {
     const step = 50;
     let num = 0;
     const tableBox = this.$refs.tableBox;
     const stepTime = setInterval(function () {
      num += 2;
      if (num > step) {
       num = 0;
       clearInterval(stepTime);
      } else {
       tableBox.scrollTop += 2;
      }
     }, 20);
    },
    scrolls() {
     const that = this;
     const tableBox = this.$refs.tableBox;
     const tableInner = this.$refs.tableInner;
     clearInterval(this.timer);
     this.timer = setInterval(function () {
      if(tableBox.scrollTop === tableInner.scrollHeight) {
       tableBox.scrollTop = 0;
      }
      that.stepScroll();
     }, 2000);
    },
   }
  })
 </script>
</html>

setInterval踩坑:

发现这种方法实现的定时轮播,有一阵没访问页面,会出现卡停的情况,采用下面的解决方法:

<script>
 new Vue({
  el: '#app',
  data: {
   tableHei: 'auto',
   timer: null,
   size: 0,
   stopSign: true, // 判断定时器是否停止标识
   stepTime: null, // 改为全局定时器
  },
  mounted() {
   const that = this;
   // 增加浏览器激活状态判断。非激活状态为onblur
   window.onfocus = function(e) {
    const tableBox = that.$refs.tableBox;
    const sT = tableBox.scrollTop;
    console.log("激活状态!")
    if (!that.stopSign) {
     tableBox.scrollTop = Math.round(sT / 50) * 50;
     clearInterval(that.stepTime);
    }
   }
   this.getTable();
  },
  methods: {
   getTable() {
    const outHei = this.$refs.tableoOut.clientHeight - 60;
    this.size = Math.floor(outHei / 50);
    this.tableHei = this.size * 50 + 'px';
    this.scrolls();
   },
   stepScroll() {
    const that = this;
    const step = 50;
    let num = 0;
    const tableBox = this.$refs.tableBox;
    // 改为全局定时器,且在调用前先进行清空
    clearInterval(this.stepTime);
    this.stepTime = setInterval(function () {
     that.stopSign = false;
     num += 2;
     if (num > step) {
      num = 0;
      clearInterval(that.stepTime);
      that.stopSign = true;
     } else {
      tableBox.scrollTop += 2;
     }
    }, 1000 / 60);
   },
   scrolls() {
    const that = this;
    const tableBox = this.$refs.tableBox;
    const tableInner = this.$refs.tableInner;
    clearInterval(this.timer);
    this.timer = setInterval(function () {
     // 修改定时器结束判断条件
     if(tableBox.scrollTop >= tableInner.scrollHeight) {
      tableBox.scrollTop = 0;
     }
     that.stepScroll();
    }, 2000);
   },
  }
 })
</script>


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