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vue实现滚动请求接口数据

weednoah 2022-04-29 阅读 64

 直接贴代码:  

<template>
  <div style="margin: 200px;">
    <el-select v-model="qqqq"  v-el-select-loadmore="loadmore" placeholder="滚动加载接口数据">
      <el-option v-for="(dict,index) in selectUser" :key="index" :label="dict.name" :value="dict.id" />
    </el-select>
  </div>
</template>
<script>
  export default {
    directives: {
      'el-select-loadmore': {
        bind(el, binding) {
          // 获取element-ui定义好的scroll盒子
          const scrollDom = el.querySelector('.el-select-dropdown .el-select-dropdown__wrap');
          scrollDom.addEventListener('scroll', function() {
            /**
             * scrollHeight 获取元素内容高度(只读)
             * scrollTop 获取或者设置元素的偏移值,常用于, 计算滚动条的位置, 当一个元素的容器没有产生垂直方向的滚动条, 那它的scrollTop的值默认为0.
             * clientHeight 读取元素的可见高度(只读)
             * 如果元素滚动到底, 下面等式返回true, 没有则返回false:
             * ele.scrollHeight - ele.scrollTop === ele.clientHeight;
             */
            const condition = this.scrollHeight - this.scrollTop <= this.clientHeight;
            if (condition) {
              binding.value();
            }
          });
        }
      }
    },
    data() {
      return {
        qqqq: '',
        selectUser: [],
        currentPage: 0, //  分页参数 第几页
        pagesize: 10, //   分页参数 每页多少条数据
        data:[]
      }
    },
    methods: {

      mockData() {
        this.data = []
        for (let i = this.currentPage; i < this.currentPage*this.pagesize; i++) {
          this.data.push({
            name: `张${i}`,
            id: i
          })
        }
      },
      // 下拉懒加载自定义方法
      loadmore() {
        this.getListMedia()
      },
      //模拟接口数据
      getListMedia() {
        setTimeout(() => {
          this.currentPage ++
          this.data = []
          for (let i = this.currentPage; i < this.currentPage*this.pagesize; i++) {
            this.data.push({
              name: `张${i}`,
              id: i
            })
          }
         this.selectUser = [...this.selectUser, ...this.data]
         console.log(this.currentPage)
        }, 0)

      }
    },
    created() {
      this.getListMedia()

    }
  }
</script>

结果:

 

 

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