App.jsx
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import React from "react"; import { Form, Field } from "react-final-form"; // Validation function const validate = (values) => { const errors = {}; if (!values.name) { errors.name = "Name is required"; } else if (values.name.length < 3) { errors.name = "Name must be at least 3 characters"; } if (!values.age) { errors.age = "Age is required"; } else if (isNaN(Number(values.age))) { errors.age = "Age must be a number"; } else if (values.age <= 0) { errors.age = "Age must be greater than 0"; } if (!values.country) { errors.country = "Country is required"; } return errors; }; // Form submission handler const onSubmit = (values) => { alert(`Form submitted: ${JSON.stringify(values, null, 2)}`); }; const App = () => { return ( <div style={{ display: "flex", justifyContent: "center", alignItems: "center", height: "100vh", backgroundColor: "#f9f9f9", padding: "20px", }} > <Form onSubmit={onSubmit} validate={validate} render={({ handleSubmit, submitting, pristine }) => ( <form onSubmit={handleSubmit}> {/* Name Field */} <div style={{ marginBottom: "15px" }}> <Field name="name"> {({ input, meta }) => ( <div> <label>Name</label> <input {...input} type="text" placeholder="Enter your name" style={{ width: "100%", padding: "8px", marginBottom: "5px", }} /> {meta.error && meta.touched && ( <span style={{ color: "red" }}>{meta.error}</span> )} </div> )} </Field> </div> {/* Age Field */} <div style={{ marginBottom: "15px" }}> <Field name="age"> {({ input, meta }) => ( <div> <label>Age</label> <input {...input} type="number" placeholder="Enter your age" style={{ width: "100%", padding: "8px", marginBottom: "5px", }} /> {meta.error && meta.touched && ( <span style={{ color: "red" }}>{meta.error}</span> )} </div> )} </Field> </div> {/* Country Field */} <div style={{ marginBottom: "15px" }}> <Field name="country"> {({ input, meta }) => ( <div> <label>Country</label> <input {...input} type="text" placeholder="Enter your country" style={{ width: "100%", padding: "8px", marginBottom: "5px", }} /> {meta.error && meta.touched && ( <span style={{ color: "red" }}>{meta.error}</span> )} </div> )} </Field> </div> {/* Submit Button */} <div style={{ textAlign: "center" }}> <button type="submit" disabled={submitting || pristine}> Submit </button> </div> </form> )} /> </div> ); }; export default App; |
