zcloud-ui/lib/directives/selectLoadmore.js

A Component Library for Vue.js.

'use strict';

exports.__esModule = true;
exports.default = {
  bind: function bind(el, binding) {
    // 获取element-ui定义好的scroll盒子
    var SELECTWRAP_DOM = el.querySelector('.el-select-dropdown .el-select-dropdown__wrap');
    SELECTWRAP_DOM.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;
        */
      var CONDITION = this.scrollHeight - this.scrollTop <= this.clientHeight + 200;
      if (CONDITION) {
        binding.value();
      }
    });
  }
  //   unbind (el) {
  //     const SELECTWRAP_DOM = el.querySelector('.el-select-dropdown .el-select-dropdown__wrap');
  //     SELECTWRAP_DOM.removeEventListener('scroll');
  //   }

};