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react表单验证实现

2026-01-27 20:09:03React

React 表单验证的实现方法

使用受控组件实现基础验证

通过useState管理表单输入值，在提交时进行验证：

react表单验证实现

import { useState } from 'react';

function Form() {
  const [email, setEmail] = useState('');
  const [errors, setErrors] = useState({});

  const validate = () => {
    const newErrors = {};
    if (!email) newErrors.email = 'Email is required';
    else if (!/^[^\s@]+@[^\s@]+\.[^\s@]+$/.test(email)) 
      newErrors.email = 'Invalid email format';
    setErrors(newErrors);
    return Object.keys(newErrors).length === 0;
  };

  const handleSubmit = (e) => {
    e.preventDefault();
    if (validate()) {
      // 提交逻辑
    }
  };

  return (
    <form onSubmit={handleSubmit}>
      <input 
        type="email" 
        value={email}
        onChange={(e) => setEmail(e.target.value)}
      />
      {errors.email && <span>{errors.email}</span>}
      <button type="submit">Submit</button>
    </form>
  );
}

使用Formik和Yup进行高级验证

Formik处理表单状态，Yup提供声明式验证规则：

react表单验证实现

import { Formik, Form, Field } from 'formik';
import * as Yup from 'yup';

const validationSchema = Yup.object().shape({
  email: Yup.string()
    .email('Invalid email')
    .required('Required'),
  password: Yup.string()
    .min(8, 'Too short')
    .required('Required')
});

function FormikForm() {
  return (
    <Formik
      initialValues={{ email: '', password: '' }}
      validationSchema={validationSchema}
      onSubmit={(values) => {
        console.log(values);
      }}
    >
      {({ errors, touched }) => (
        <Form>
          <Field name="email" type="email" />
          {errors.email && touched.email && <div>{errors.email}</div>}

          <Field name="password" type="password" />
          {errors.password && touched.password && <div>{errors.password}</div>}

          <button type="submit">Submit</button>
        </Form>
      )}
    </Formik>
  );
}

实时验证实现

在输入变化时立即验证，提供即时反馈：

function LiveValidation() {
  const [formData, setFormData] = useState({
    username: '',
    password: ''
  });
  const [errors, setErrors] = useState({});

  const handleChange = (e) => {
    const { name, value } = e.target;
    setFormData(prev => ({ ...prev, [name]: value }));

    // 实时验证逻辑
    const newErrors = { ...errors };
    if (name === 'username') {
      if (value.length < 3) newErrors.username = 'Too short';
      else delete newErrors.username;
    }
    if (name === 'password') {
      if (value.length < 8) newErrors.password = 'Minimum 8 characters';
      else delete newErrors.password;
    }
    setErrors(newErrors);
  };

  return (
    <form>
      <input
        name="username"
        value={formData.username}
        onChange={handleChange}
      />
      {errors.username && <span>{errors.username}</span>}

      <input
        name="password"
        type="password"
        value={formData.password}
        onChange={handleChange}
      />
      {errors.password && <span>{errors.password}</span>}
    </form>
  );
}

自定义验证钩子

创建可复用的验证逻辑钩子：

function useFormValidation(initialState, validate) {
  const [values, setValues] = useState(initialState);
  const [errors, setErrors] = useState({});

  const handleChange = (e) => {
    const { name, value } = e.target;
    setValues({
      ...values,
      [name]: value
    });
    setErrors({
      ...errors,
      [name]: validate[name] ? validate[name](value) : null
    });
  };

  return {
    values,
    errors,
    handleChange
  };
}

// 使用示例
function CustomHookForm() {
  const validate = {
    email: (value) => {
      if (!value) return 'Email is required';
      if (!/^[^\s@]+@[^\s@]+\.[^\s@]+$/.test(value)) 
        return 'Invalid email format';
      return null;
    }
  };

  const { values, errors, handleChange } = useFormValidation(
    { email: '' },
    validate
  );

  return (
    <form>
      <input
        name="email"
        value={values.email}
        onChange={handleChange}
      />
      {errors.email && <span>{errors.email}</span>}
    </form>
  );
}