👀 Views: 33 💬 Answers: 1 📅 Created: 2025-06-01

reactjs hooks form-validation javascript

Could someone explain Quick question that's been bugging me - Hey everyone, I'm running into an issue that's driving me crazy... I'm working on a form in React (version 17.0.2) that needs to handle dynamic fields for user input based on previous selections. However, I'm having trouble with the state not updating as expected when I dynamically add or remove fields. Specifically, when I add a new input field, it doesn't seem to capture its value correctly in the state. Here’s a simplified version of my component: ```javascript import React, { useState } from 'react'; const DynamicForm = () => { const [fields, setFields] = useState([{ name: '' }]); const handleChange = (index, event) => { const values = [...fields]; values[index].name = event.target.value; setFields(values); }; const addField = () => { setFields([...fields, { name: '' }]); }; const removeField = (index) => { const values = [...fields]; values.splice(index, 1); setFields(values); }; return ( <div> {fields.map((field, index) => ( <div key={index}> <input type="text" value={field.name} onChange={(event) => handleChange(index, event)} /> <button type="button" onClick={() => removeField(index)}>Remove</button> </div> ))} <button type="button" onClick={addField}>Add Field</button> </div> ); }; export default DynamicForm; ``` When I add a new field, I can type into it, but when I try to log the state of `fields` after entering data, it seems like the previous values are getting lost, or the state is not reflecting the current values correctly. For example, if I add a field, type 'Test' into it, and then add another field, the first field's value resets to an empty string. I've tried using the `useEffect` hook to log the `fields` state whenever it changes, but the logs indicate that the state isn't capturing the input values correctly. I've also ensured that the input elements have the correct `value` attributes bound to the state. Has anyone encountered similar issues when handling dynamic form fields in React? What could be causing this state update problem? For context: I'm using Javascript on Ubuntu. Am I missing something obvious? My development environment is Linux. What am I doing wrong? This is part of a larger web app I'm building. Thanks for your help in advance!