es-form-table/packages/es-form-table/directive/directive.js

基于element-ui-form和table两大组件进一步改良的控件，目的是为了解放前端在表单这块的操作

import Vue from 'vue';

Vue.directive('loadmore', {
  bind(el, binding) {
    // 获取element-ui定义好的scroll盒子
    const SELECTWRAP_DOM = el.querySelector(
      '.el-select-dropdown .el-scrollbar__wrap'
    );
    SELECTWRAP_DOM.addEventListener('scroll', function() {
      const CONDITION = this.scrollHeight - this.scrollTop <= this.clientHeight;
      if (CONDITION) {
        binding.value();
      }
    });
  }
});