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动态加载时获取value和label的值

前言

1、使用ref的getCheckedNodes方法获取label的值，change事件只传递value值；
2、回显自动处理，无需手动干预，设置好接口即可。

---

html

<el-cascader ref="refCascader" v-model="form.addressList" clearable :props="props" @change="changeCascader"></el-cascader>

---

JavaScript
data

data() {
  return {
    form: {
      addressList: null
    },
    props: {
      // 设置为动态加载模式
      lazy: true,
      // 配置value字段
      value: 'id',
      // 配置label字段
      label: 'name',
      lazyLoad(node, resolve) {
        const { level, data: { id = '' } } = node;
        let mapList = (list) => list.map(item => {
          // 设置层级(表示到了第三级便不再显示展开图标，点击也不再有加载动画)
          item.leaf = level >= 2;

          return item;
        });

        getAddrTree({ parentId: id }).then(re => resolve(mapList(re.response)));
      }
    }
  }
}

---

methods

changeCascader(event) {
  // 不明智的数据存储方式
  // let nodes = this.$refs.refCascader.getCheckedNodes()[0];
  // let [provinces, city, county] = nodes.pathLabels || [];
  // let [provincesId, cityId, countyId] = event || [];

  // this.form.provincesId = provincesId || '';
  // this.form.cityId = cityId || '';
  // this.form.countyId = countyId || '';
  // this.form.provinces = provinces || '';
  // this.form.city = city || '';
  // this.form.county = county || '';
  
  // 通用的数据存储方式
  let nodes = this.$refs.refCascader.getCheckedNodes()[0];
  this.form.ids = event.toString();
  this.form.label = nodes.pathLabels.toString();
}