React redux — 输入字段不允许我输入

Question

所以我有 3 个输入字段，一个用于姓名、电子邮件和密码。 电子邮件和密码输入字段工作正常，但名称输入字段不允许我输入任何内容。 我将输入字段的值设置为来自用户，因此它会自动填充字段。 这是我的代码

    import React, {useState, useEffect} from 'react';
    import {useParams} from 'react-router-dom';
    import {connect} from 'react-redux';
    import {editUserData, fetchUserData, deleteProfile} from '../actions/index';

    const EditUser = props => {
        const [user, setUser] = useState({name: '', email: '', password: ''})
        const params = useParams();
        
        const editUser = e => {
            e.preventDefault();
            props.editUserData(params, user);
        }

        const handleChanges = e => {
            e.persist();
            setUser({...user, [e.target.name]: e.target.value});
        }

        useEffect(() => {
            props.fetchUserData(params, setUser);
        }, [])

        const deleteOnClick = () => {
            props.deleteProfile(params)
        }
        
            return (
                <>
                <form className='editUserForm' onSubmit={editUser}>
                    <h3>Edit Profile !</h3>
                    <div>Name</div>
                    <input className='editInput' type='text' name='name' value={`${user.firstName} ${user.lastName}`} onChange={handleChanges} /> 
                    <div>Email</div>
                    <input className='editInput' type='text' name='email' value={user.email} onChange={handleChanges} />
                    <div>Password</div>
                    <input className='editInput' type='text' name='password' value={user.password} onChange={handleChanges} />
                    <button className='submitButton'>Submit</button>
                </form>
                <div className='deleteProfile'>
                    <button className='deleteProfileButton' onClick={deleteOnClick}>Delete Profile</button>
                </div>
                </>
            )
    }

    const mapStateToProps = state => {
        return {
            users: [], 
            user: {}, 
            registerSuccessMessage: '',
            user_stories: {}, 
            isLoading: false, 
            error: null 
        }
    }

    export default connect(mapStateToProps, {editUserData, fetchUserData, deleteProfile})(EditUser);

编辑（根据@Boussadjra 的建议）

这就是 props.fetchUserData 之后的状态。 -- setUser 在哪里 -- 这就是为什么我有输入值 ${user.firstName} ${user.lastName}

Answer 1

user.firstName和user.lastName未定义，它们在您的user状态中未定义为属性，因此您应该简单地使用firstName和lastName属性作为 value ：

 value={ us}

或定义您的状态如下：

 const [user, setUser] = useState({firstName:'',lastName:'', email: '', password: ''})

我们假设名字和姓氏用空格分隔，所以当你来更新状态时，拆分那个名字：

  const handleChanges = e => {
        e.persist();
       if(e.target.name==='name'){
           let name=e.target.value.split(' ')
           setUser({...user, firstName:name[0],lastName:name[1]});
        }else{
        setUser({...user, [e.target.name]: e.target.value});
        }
    }

Answer 2

那是因为您将 "name" input的value为${user.firstName} ${user.lastName} ，这是undefined 。 您可以将您的user状态设置为最初具有这些属性，但我建议对firstName 、 lastName 、 email和password每一个使用单独的useState() （因为在单个input组合名字和姓氏很容易出错，如评论中所述）：

 import React, {useState, useEffect} from 'react'; import {useParams} from 'react-router-dom'; import {connect} from 'react-redux'; import {editUserData, fetchUserData, deleteProfile} from '../actions/index'; const EditUser = props => { const [firstName, setFirstName] = useState(''); const [lastName, setLastName] = useState(''); const [email, setEmail] = useState(''); const [password, setPassword] = useState(''); const params = useParams(); const editUser = e => { e.preventDefault(); props.editUserData(params, user); } useEffect(() => { props.fetchUserData(params, setUser); }, []) const deleteOnClick = () => { props.deleteProfile(params) } return ( <> <form className='editUserForm' onSubmit={editUser}> <h3>Edit Profile !</h3> <div>First Name</div> <input className='editInput' type='text' name='firstName' value={firstName} onChange={e => setFirstName(e.target.value)} /> <div>Last Name</div> <input className='editInput' type='text' name='lastName' value={lastName} onChange={e => setLastName(e.target.value)} /> <div>Email</div> <input className='editInput' type='text' name='email' value={email} onChange={e => setEmail(e.target.value)} /> <div>Password</div> <input className='editInput' type='text' name='password' value={password} onChange={e => setPassword(e.target.value)} /> <button className='submitButton'>Submit</button> </form> <div className='deleteProfile'> <button className='deleteProfileButton' onClick={deleteOnClick}>Delete Profile</button> </div> </> ) } const mapStateToProps = state => { return { users: [], user: {}, registerSuccessMessage: '', user_stories: {}, isLoading: false, error: null } } export default connect(mapStateToProps, {editUserData, fetchUserData, deleteProfile})(EditUser);