To perform email validation using React Hook Form and an API, you can utilize the useForm hook from React Hook Form and integrate it with an email validation API. The API will be responsible for validating the email address and returning the validation result to your React app. Here's a step-by-step guide on how to achieve this:

  1. Set up React Hook Form: First, make sure you have React Hook Form installed in your project.

    bash
    npm install react-hook-form

    Then, create a form component and set up the form using the useForm hook.

javascript
// EmailForm.js import React from 'react'; import { useForm } from 'react-hook-form'; const EmailForm = () => { const { register, handleSubmit, errors } = useForm(); const onSubmit = (data) => { // Handle form submission here }; return ( <form onSubmit={handleSubmit(onSubmit)}> <input type="email" name="email" placeholder="Enter your email" ref={register({ required: 'Email is required', pattern: { value: /^[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,4}$/i, message: 'Invalid email address', }, })} /> {errors.email && <p>{errors.email.message}</p>} <button type="submit">Submit</button> </form> ); }; export default EmailForm;
  1. Implement the Email Validation API: Set up an email validation API on your server or use a third-party email validation service. This API should accept an email address as input and return a response indicating whether the email is valid or not.

  2. Integrate the API with React Hook Form: In the onSubmit function of your form, call the email validation API with the email address entered by the user. Update the form state accordingly based on the API response.

javascript
// EmailForm.js import React, { useState } from 'react'; import { useForm } from 'react-hook-form'; const EmailForm = () => { const { register, handleSubmit, errors } = useForm(); const [isValidEmail, setIsValidEmail] = useState(null); const onSubmit = async (data) => { // Call the email validation API with the email address try { const response = await fetch('/api/validate-email', { method: 'POST', headers: { 'Content-Type': 'application/json', }, body: JSON.stringify({ email: data.email }), }); const result = await response.json(); setIsValidEmail(result.isValid); // Assuming the API returns a response like { isValid: true } or { isValid: false } } catch (error) { console.error('Error validating email:', error); } }; return ( <form onSubmit={handleSubmit(onSubmit)}> <input type="email" name="email" placeholder="Enter your email" ref={register({ required: 'Email is required', pattern: { value: /^[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,4}$/i, message: 'Invalid email address', }, })} /> {errors.email && <p>{errors.email.message}</p>} {isValidEmail === false && <p>Email is not valid</p>} <button type="submit">Submit</button> </form> ); }; export default EmailForm;

In this example, when the form is submitted, the onSubmit function makes an API call to the /api/validate-email endpoint with the email address entered by the user. The API should then validate the email and return the validation result. The result is stored in the isValidEmail state, and a message is displayed to the user indicating whether the email is valid or not.

Please note that the implementation of the email validation API is not covered in this example, as it can vary depending on the service or server-side technology you choose to use. Make sure to implement the API according to your specific requirements and email validation service.

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