小程序表单校验uni-forms的正确使用方式以及避坑指南

 <uni-forms ref="form" :modelValue="ruleForm" validate-trigger="bind">
   <uni-forms-item label="账号" name="account">
     <input v-model.trim="ruleForm.account" 
     @blur="binddata('account', $event.detail.value)" 
     placeholder="请输入您的登录账号" />
   </uni-forms-item>
 </uni-forms>

<template>
  <uni-forms ref="form" :modelValue="ruleForm" validate-trigger="bind">
    ......
  </uni-forms>
</template>

<script>
export default {
  data() {
    return {
      // 校验规则
      rules: {
        email: {
          rules: [
            {
              validateFunction: this.checkEmail,
            },
          ],
        },
      },
    };
  },
  onReady() {
    // 需要在onReady中设置规则
    this.$refs.form.setRules(this.rules);
  },
  methods: {
    /**
     * 表单验证邮箱
     */
    checkEmail(rule, value, allData, callback) {
      if (value !== "" && !verifyEmail(value)) {
        return callback("邮箱不正确");
      }
      callback();
    },
  },
};
</script>

export default {
  data() {
    return {
      // 校验规则
      rules: {
        account: {
          rules: [
            {
              required: true,
              errorMessage: '请输入您的账号',
            },
            {
              validateFunction: this.checkAccount,
            },
          ],
        },
      },
    };
  },
  methods: {
    // 表单验证账号
    checkAccount(rule, value) {
      return new Promise((resolve, reject) => {
        // 先进行规则校验
        if (value === '' || !verifyAccount(value)) {
          return reject(new Error('只能输入4-30位英文、数字、下划线'))
        }

        // 再进行异步校验，checkUser为本系统api异步方法，结合你系统使用你自己的方法
        apiCheckAccount({ account: value })
          .then((data) => {
            if (data.exist) {
              return reject(new Error('账号已存在'))
            }
            resolve()
          })
          .catch((err) => {
            return reject(new Error(err.message))
          })
      })
    },
  },

<template>
  <view class="register">
    <view class="title">最实用表单校验</view>
    <uni-forms ref="form" :modelValue="ruleForm" validate-trigger="bind" label-width="40">
      <uni-forms-item label="账号" name="account">
        <input v-model.trim="ruleForm.account" @blur="binddata('account', $event.detail.value)" placeholder="请输入您的登录账号" />
      </uni-forms-item>
      <uni-forms-item label="姓名" name="name">
        <input v-model.trim="ruleForm.name" @blur="binddata('name', $event.detail.value)" placeholder="请输入您的姓名" />
      </uni-forms-item>
      <uni-forms-item class="form-item-center">
        <button type="primary" @click="submit()">注册</button>
      </uni-forms-item>
    </uni-forms>
  </view>
</template>

<script>
import { apiCheckAccount } from '@/api'
import { verifyAccount, verifyName } from '@/utils'

export default {
  data() {
    return {
      // 表单数据
      ruleForm: {
        account: '', // 账号
        name: '', // 姓名
      },

      rules: {},
    }
  },
  onReady() {
    this.setRules()
    // 需要在onReady中设置规则
    this.$refs.form.setRules(this.rules)
  },
  methods: {
    // 提交表单
    submit() {
      this.$refs.form
        .validate()
        .then(() => {
          uni.showToast({
            title: '注册成功！',
            duration: 2000,
            icon: 'success',
          })
        })
        .catch((err) => {
          console.log('表单校验失败：', err)
        })
    },

    // 设置校验规则
    setRules() {
      this.rules = {
        account: {
          rules: [
            {
              required: true,
              errorMessage: '请输入您的账号',
            },
            {
              validateFunction: this.checkAccount,
            },
          ],
        },
        name: {
          rules: [
            {
              required: true,
              errorMessage: '请输入您的姓名',
            },
            {
              validateFunction: this.checkName,
            },
          ],
        },
      }
    },

    // 验证账号
    checkAccount(rule, value) {
      return new Promise((resolve, reject) => {
        // 先进行规则校验
        if (value === '' || !verifyAccount(value)) {
          return reject(new Error('只能输入4-30位英文、数字、下划线'))
        }

        // 再进行异步校验，checkUser为本系统api异步方法，结合你系统使用你自己的方法
        apiCheckAccount({ account: value })
          .then((data) => {
            if (data.exist) {
              return reject(new Error('账号已存在'))
            }
            resolve()
          })
          .catch((err) => {
            return reject(new Error(err.message))
          })
      })
    },

    // 验证姓名
    checkName(rule, value, allData, callback) {
      if (!verifyName(value)) {
        return callback('只能输入1-30位中英文和数字')
      }
      callback()
    },
  },
}
</script>