vant(ZanUi)结合async-validator实现表单验证的方法

最近在开发一个移动端商城项目，用到了有赞的 vant，因为最近大都采用 element ui在做PC端的东西，对比来说，vant的完成度还是偏低了点，很多细节都虽然都实现了接口，但是想使用得自己去想办法，没办法拿来即用。昨天用到 Uploader 图片上传 如是，提供了file回调，却没有提供上传功能，我必须给他加2个函数实现axios提交才能用，还有今天用到表单验证这块，它的 Field组件虽然给了error-message的错误提示接口，但是没有内置表单验证功能。

element ui采用async-validator实现表单验证，我也基于这个组件进行扩展，async-validator不支持细粒化验证，于是先对它进行扩展

validator.js

import asyncValidator from 'async-validator'

class validator {
 /**
 * 构造
 * @param rules object async-validator rules
 * @param data 初始对象
 */
 constructor(rules, data) {
 this.setData(data);
 this.setRules(rules);
 }

 /**
 * 重新定义初始对象
 * 也可以直接修改实例的data
 * validator.data = newData
 * @param data
 */
 setData(data) {
 this.data = data;
 }

 /**
 * 设定规则
 * @param rules rules object async-validator rules
 * @param cover 是否替换旧规则
 */
 setRules(rules, {cover} = {}) {
 if (cover === undefined || cover) {
  this.validators = {};
 }
 for (let attr in rules) {
  const rule = {};
  rule[attr] = rules[attr];
  this.validators[attr] = new asyncValidator(rule);
 }
 }

 /**
 * 执行验证
 * @param callback(errors, fields)
 * @param data 可选 传空将验证构造data 传string或数组验证构造data的响应字段
 * 以上参数顺序可互转
 */
 validate(callback, data) {
 let cb,d;
 if (typeof callback === 'function' ){
  cb = callback;
  d = data;
 }else if (typeof data === 'function' ){
  cb = data;
  d = callback;
 }

 let _d = d;

 if (this.data) {
  if (!d) {
  _d = this.data;
  } else if (typeof d === 'string') {
  _d = {};
  _d[d] = this.data[d]
  } else if (Array.isArray(d)) {
  _d = {};
  d.forEach(attr => {
   _d[attr] = this.data[attr]
  })
  }
 }

 const err = [];

 if (_d) {
  for (let attr in _d) {
  if (this.validators[attr]) {
   const o = {};
   o[attr] = _d[attr];
   this.validators[attr].validate(o, (error) => {
   if (error) {
    err.push(error[0])
   }
   })
  }
  }
 }

 cb && cb(err.length > 0, err)

 }
}

export default function (rules, data) {
 return new validator(rules, data)
}

demo.vue

<template>
 <div>
 <van-cell-group>
  <van-field
   placeholder="名称/姓名"
   label="名称"
   v-model="data.name"
   :error-message="errorMsg.name"
  ></van-field>
  <van-field
   type="tel"
   placeholder="请输入手机号码"
   label="手机"
   v-model="data.mobile"
   :error-message="errorMsg.mobile"
   @click-icon="data.mobile = ''"
   icon="clear"
  ></van-field>
  <van-field
   center
   v-model="data.code"
   label="短信验证码"
   placeholder="请输入验证码"
   icon="clear"
   :error-message="errorMsg.code"
   @click-icon="data.code = ''"
  >
  <van-button
   slot="button"
   size="small"
   :disabled="countdown > 0"
   @click="sendMobileCode"
   type="primary">
   {{ countdown ? countdown + 's' : '发送'}}
  </van-button>
  </van-field>
 </van-cell-group>
 <div class="pad-all mar-top">
  <van-button
   block
   type="primary"
   @click="submit">
  立即注册
  </van-button>
  <van-button
   block
   class="mar-top"
   @click="reset">
  重置
  </van-button>
 </div>
 </div>
</template>
<script>
 import {Field, CellGroup, Cell, Button, Toast} from 'vant';
 import validator from './validator.js'

 export default {
 name: 'Demo',
 components: {
  [Field.name]: Field,
  [Button.name]: Button,
  [Cell.name]: Cell,
 },
 data() {
  return {
  countdown: 0,
  data: {
   name: '',
   mobile: '',
   code: '',
  },
  errorMsg: {
   name: '',
   mobile: '',
   code: '',
  },
  rules: {
   name: [
   {required: true, message: '请输入名称'}
   ],
   mobile: [
   {
    validator: (rule, value, callback) => {
    if (!value) {
     callback('请输入手机号码');
    } else if (/^[1][0-9]{10}$/.test(value)) {
     callback();
    } else {
     callback('请输入正确的手机号码');
    }
    }
   }
   ],
   code: [
   {required: true, message: '请输入验证码'}
   ]
  },
  }
 },
 methods: {
  sendMobileCode() {
  this.validate(errors => {
   if (!errors) {
   Toast('发送成功');
   this.countdown = 60;
   this.countdownSubtract();
   }
  }, 'mobile')
  },
  countdownSubtract() {
  if (this.countdown > 0) {
   setTimeout(() => {
   this.countdown -= 1;
   this.countdownSubtract()
   }, 1000)
  }
  },
  /**
  * 清除验证提示
  * @param attrs
  */
  resetField(attrs) {
  attrs = !attrs ? Object.keys(this.errorMsg) : ( Array.isArray(attrs) ? attrs : [attrs]);
  attrs.forEach(attr => {
   this.errorMsg[attr] = ''
  })
  },
  /**
  * 验证方法
  * @param callback
  * @param data
  */
  validate(callback, data) {
  this.validator.validate((errors, fields) => {
   this.resetField();
   if (errors) {
   fields.forEach(item => {
    this.errorMsg[item.field] = item.message
   })
   }
   callback && callback(errors, fields)
  }, data);
  },
  submit() {
  this.validate((errors, fields) => {

  })
  },
  reset() {
  this.data = {
   name: '',
   code: '',
   mobile: '',
  };
  this.validator.setData(this.data);
  this.resetField();
  },
 },
 created() {
  this.validator = validator(this.rules, this.data);
 },
 }
</script>

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