element-ui+vue-treeselect下拉框的校验过程

		 <FormItem label="选择父级分类：" prop="classify">
	          <treeselect
	            style="width:250px"
	            v-model="formItem.classify"
	            :normalizer="normalizer"
	            :options="options"
	            @input="changeValue"
	            noOptionsText="暂无数据"
	            placeholder="请选择分类"
	          />
        </FormItem>
		<script>
		data(){
			return{
				// 表单验证规则
				 ruleValidate: {
				        classify: [
				          {
				            required: true,
				            type: "string",
				            message: "请选择分类",
				            trigger: "input" /*看这里*/
				          }
				        ]
			 		}
			}
		}
		
		// 方法
		methods:{
			changeValue() {
	     		 this.$refs["Form"].validateField("classify");
	   		 },
		}
		
		</script>

<template slot-scope="scope">
 <treeselect 
    v-model="scope.row.departId" 
    @select="departTreeSelected"
    :disable-branch-nodes="false" 
    :show-count="false" 
    :multiple="false" 
    :options="departs"  
    placeholder="请选择"/>
  </treeselect>
 </template>

methods: {
	 //选中树形部门选项
    departTreeSelected(node,instanceId){
      let url = '/datas/staff/busiselect?departCode=' +  node.code;
      let _this = this;
      this.$http.get(url).then(res => {
        if(res.data.code==0){
          var datas = res.data.data;
          for(let item in datas) {
            //出差申请人数组
            _this.staffArr.push({
             value: item,
             label: datas[item].match(/(\S*)-/)[1] //截取'-'前面内容作为人员姓名
            })
            //职级数组
            _this.rankArr.push({
              value: item,
              rank: datas[item].match(/-(\S*)/)[1] //截取'-'后面内容作为职级id
            })
          }
        }
      })
      .catch(err => {
        return err;
      });
    },
}