How to use the useMutation hook for handling form submissions with React-Query



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The useMutation hook in React-Query is used for handling mutations, such as form submissions, API calls that modify data on the server, etc. Here's how you can use useMutation for handling form submissions in a React component:

First, make sure you have React-Query installed in your project:

bash
npm install react-query

Then, you can use useMutation in your component:

javascript
import React, { useState } from 'react';
import { useMutation } from 'react-query';

const submitFormData = async (formData) => {
  // Replace this with your API call to submit the form data
  const response = await fetch('YOUR_API_ENDPOINT', {
    method: 'POST',
    headers: {
      'Content-Type': 'application/json',
    },
    body: JSON.stringify(formData),
  });

  if (!response.ok) {
    throw new Error('Failed to submit form data');
  }

  return response.json();
};

const MyFormComponent = () => {
  const [formData, setFormData] = useState({
    // Initialize your form data state
    name: '',
    email: '',
    // Add more fields as needed
  });

  const mutation = useMutation(submitFormData);

  const handleSubmit = async (event) => {
    event.preventDefault();
    try {
      // Call the mutation function with the form data
      await mutation.mutateAsync(formData);
      // Handle successful form submission
      console.log('Form submitted successfully');
    } catch (error) {
      // Handle form submission error
      console.error('Form submission error:', error);
    }
  };

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

  return (
    <form onSubmit={handleSubmit}>
      <input
        type="text"
        name="name"
        value={formData.name}
        onChange={handleChange}
        placeholder="Name"
      />
      <input
        type="email"
        name="email"
        value={formData.email}
        onChange={handleChange}
        placeholder="Email"
      />
      {/* Add more input fields here */}
      <button type="submit">Submit</button>
    </form>
  );
};

export default MyFormComponent;

In this example:

  • We define a submitFormData function that represents the API call to submit the form data. You need to replace 'YOUR_API_ENDPOINT' with your actual API endpoint.
  • We use the useMutation hook to create a mutation instance. The submitFormData function is passed as the mutation function.
  • In the component, we handle form submission in the handleSubmit function. We call mutation.mutateAsync(formData) to execute the mutation (i.e., submit the form data).
  • If the mutation is successful, the handleSubmit function logs a success message to the console. If there's an error, it logs an error message instead.
  • The handleChange function updates the form data as the user types in the input fields.

React-Query will handle the loading state, error state, and cache management for you, providing a clean and efficient way to handle form submissions in your React application.

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