掌握 React useFormStatus：全球开发者综合指南

            import React from 'react';
import { useFormStatus } from 'react-dom'; // Or import from 'react-dom' if using React 18

function RegistrationForm() {
  const { pending, method, action } = useFormStatus();

  async function handleSubmit(event) {
    event.preventDefault();

    const formData = new FormData(event.currentTarget);

    try {
      const response = await fetch('/api/register', {
        method: 'POST',
        body: formData,
      });

      if (response.ok) {
        // Handle successful registration (e.g., show a success message)
        alert('Registration successful!');
      } else {
        // Handle registration failure (e.g., show an error message)
        alert('Registration failed.');
      }
    } catch (error) {
      // Handle network errors or other exceptions
      console.error('Error during registration:', error);
      alert('An error occurred during registration.');
    }
  }

  return (
    <form onSubmit={handleSubmit} action='/api/register' method='POST'>
      <div>
        <label htmlFor='name'>Name:</label>
        <input type='text' id='name' name='name' required />
      </div>
      <div>
        <label htmlFor='email'>Email:</label>
        <input type='email' id='email' name='email' required />
      </div>
      <button type='submit' disabled={pending}>
        {pending ? 'Registering...' : 'Register'}
      </button>
      {method && <p>Method used: {method}</p>}
      {action && <p>Action used: {action}</p>}
    </form>
  );
}

export default RegistrationForm;

            

              
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            import React from 'react';
import { useFormik } from 'formik';
import * as Yup from 'yup';
import { useFormStatus } from 'react-dom';

function RegistrationForm() {
  const { pending } = useFormStatus();

  const formik = useFormik({
    initialValues: {
      name: '',
      email: '',
      password: '',
    },
    validationSchema: Yup.object({
      name: Yup.string().required('Name is required'),
      email: Yup.string().email('Invalid email address').required('Email is required'),
      password: Yup.string().min(8, 'Password must be at least 8 characters').required('Password is required'),
    }),
    onSubmit: async (values, { setSubmitting }) => {
      try {
        // Simulate an API call
        await new Promise(resolve => setTimeout(resolve, 1000));
        alert('Registration successful!');
      } catch (error) {
        // Handle errors
        alert('Registration failed.');
      } finally {
        setSubmitting(false);
      }
    },
  });

  return (
    <form onSubmit={formik.handleSubmit} action='/api/register' method='POST'>
      <div>
        <label htmlFor='name'>Name:</label>
        <input type='text' id='name' name='name' onChange={formik.handleChange} onBlur={formik.handleBlur} value={formik.values.name} />
        {formik.touched.name && formik.errors.name ? <div>{formik.errors.name}</div> : null}
      </div>
      <div>
        <label htmlFor='email'>Email:</label>
        <input type='email' id='email' name='email' onChange={formik.handleChange} onBlur={formik.handleBlur} value={formik.values.email} />
        {formik.touched.email && formik.errors.email ? <div>{formik.errors.email}</div> : null}
      </div>
      <div>
        <label htmlFor='password'>Password:</label>
        <input type='password' id='password' name='password' onChange={formik.handleChange} onBlur={formik.handleBlur} value={formik.values.password} />
        {formik.touched.password && formik.errors.password ? <div>{formik.errors.password}</div> : null}
      </div>
      <button type='submit' disabled={formik.isSubmitting || pending}>
        {formik.isSubmitting || pending ? 'Registering...' : 'Register'}
      </button>
    </form>
  );
}

export default RegistrationForm;

            

              
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import React from 'react';
import { useFormStatus } from 'react-dom';

function FileUploadForm() {
  const { pending } = useFormStatus();

  async function handleSubmit(event) {
    event.preventDefault();

    const formData = new FormData(event.currentTarget);

    try {
      const response = await fetch('/api/upload', {
        method: 'POST',
        body: formData,
      });

      if (response.ok) {
        alert('File uploaded successfully!');
      } else {
        alert('File upload failed.');
      }
    } catch (error) {
      console.error('Upload error:', error);
      alert('An error occurred during file upload.');
    }
  }

  return (
    <form onSubmit={handleSubmit} action='/api/upload' method='POST'>
      <input type='file' name='file' />
      <button type='submit' disabled={pending}>
        {pending ? 'Uploading...' : 'Upload'}
      </button>
      {pending && <div>Uploading... <img src='/loading.gif' alt='Loading...' /></div>}
    </form>
  );
}

export default FileUploadForm;

            

              
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import React, { useState } from 'react';
import { useFormStatus } from 'react-dom';

function ContactForm() {
  const { pending } = useFormStatus();
  const [submissionResult, setSubmissionResult] = useState(null);

  async function handleSubmit(event) {
    event.preventDefault();
    setSubmissionResult(null);

    const formData = new FormData(event.currentTarget);

    try {
      const response = await fetch('/api/contact', {
        method: 'POST',
        body: formData,
      });

      if (response.ok) {
        setSubmissionResult({ success: true, message: 'Message sent successfully!' });
        event.target.reset(); // Reset the form on success
      } else {
        const errorData = await response.json(); // Assuming the API returns JSON error
        setSubmissionResult({ success: false, message: errorData.message || 'Failed to send message.' });
      }
    } catch (error) {
      console.error('Error sending message:', error);
      setSubmissionResult({ success: false, message: 'An unexpected error occurred.' });
    }
  }

  return (
    <form onSubmit={handleSubmit} action='/api/contact' method='POST'>
      <div>
        <label htmlFor='name'>Name:</label>
        <input type='text' id='name' name='name' required />
      </div>
      <div>
        <label htmlFor='email'>Email:</label>
        <input type='email' id='email' name='email' required />
      </div>
      <div>
        <label htmlFor='message'>Message:</label>
        <textarea id='message' name='message' required />
      </div>
      <button type='submit' disabled={pending}>
        {pending ? 'Sending...' : 'Send'}
      </button>
      {submissionResult && (
        <div className={submissionResult.success ? 'success' : 'error'}>
          {submissionResult.message}
        </div>
      )}
    </form>
  );
}

export default ContactForm;

            

              
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