我的组件EditProfile使用了可重用的表单组件ProfileForm，如下所示。
EditProfile：
class EditProfile extends Component {
constructor(props) {
super(props);
this.onChange = this.onChange.bind(this);
this.onSubmit = this.onSubmit.bind(this);
}
componentDidMount() {
this.props.getCurrentProfile();
}
onSubmit(profileData) {
this.props.createProfile(profileData, this.props.history);
}
onChange(evt) {
this.setState({ [evt.target.name]: evt.target.value });
}
render() {
return <ProfileForm profile={this.props.profile} errors={this.props.errors} onSubmit={this.onSubmit} />
}
EditProfile.propTypes = {
profile: PropTypes.object.isRequired,
errors: PropTypes.object.isRequired,
createProfile: PropTypes.func.isRequired,
getCurrentProfile: PropTypes.func.isRequired
};
const mapStateToProps = (state) => ({
profile: state.profile,
errors: state.errors
});
export default connect(mapStateToProps, { createProfile, getCurrentProfile })(withRouter(EditProfile));
}
ProfileForm：
import React, { Component } from 'react';
import { Link } from 'react-router-dom';
import isEmpty from '../validation/is-empty';
import PropTypes from 'prop-types';
import TextFieldGroup from './common/TextFieldGroup';
import InputGroup from './common/InputGroup';
import SelectListGroup from './common/SelectListGroup';
import TextAreaFieldGroup from './common/TextAreaFieldGroup';
class ProfileForm extends Component {
constructor(props) {
super(props);
this.state = {
displaySocialInputs: false,
handle: props.profile ? props.profile.handle : '',
company: props.profile ? props.profile.company : '',
website: props.profile ? props.profile.website : '',
location: props.profile ? props.profile.location : '',
status: props.profile ? props.profile.status : '',
skills: props.profile ? props.profile.skills : '',
githubusername: props.profile ? props.profile.githubusername : '',
bio: props.profile ? props.profile.bio : '',
twitter: props.profile ? props.profile.twitter : '',
facebook: props.profile ? props.profile.facebook : '',
linkedin: props.profile ? props.profile.linkedin : '',
youtube: props.profile ? props.profile.youtube : '',
instagram: props.profile ? props.profile.instagram : '',
errors: props.errors || {}
};
this.onChange = this.onChange.bind(this);
this.onSubmit = this.onSubmit.bind(this);
}
componentWillReceiveProps(nextProps) {
if (nextProps.errors) {
this.setState({ errors: nextProps.errors });
}
if (nextProps.profile.profile) {
const profile = nextProps.profile.profile;
// bring skills array back to csv
const skillsCsv = profile.skills.join(',');
// if profile field wasn't provided set it to an empty string
profile.company = !isEmpty(profile.company) ? profile.company : '';
profile.website = !isEmpty(profile.website) ? profile.website : '';
profile.location = !isEmpty(profile.location) ? profile.location : '';
profile.githubusername = !isEmpty(profile.githubusername) ? profile.githubusername : '';
profile.bio = !isEmpty(profile.bio) ? profile.bio : '';
profile.social = !isEmpty(profile.social) ? profile.social : {};
profile.twitter = !isEmpty(profile.social.twitter) ? profile.social.twitter : '';
profile.facebook = !isEmpty(profile.social.facebook) ? profile.social.facebook : '';
profile.linkedin = !isEmpty(profile.social.linkedin) ? profile.social.linkedin : '';
profile.youtube = !isEmpty(profile.social.youtube) ? profile.social.youtube : '';
profile.instagram = !isEmpty(profile.social.instagram) ? profile.social.instagram : '';
// set component state
this.setState({
handle: profile.handle,
company: profile.company,
website: profile.website,
location: profile.location,
status: profile.status,
skills: skillsCsv,
githubusername: profile.githubusername,
bio: profile.bio,
twitter: profile.twitter,
facebook: profile.facebook,
linkedin: profile.linkedin,
youtube: profile.youtube,
instagram: profile.instagram
});
}
}
onChange(evt) {
this.setState({ [evt.target.name]: evt.target.value });
}
onSubmit(evt) {
evt.preventDefault();
const profileData = {
handle: this.state.handle,
company: this.state.company,
website: this.state.website,
location: this.state.location,
status: this.state.status,
skills: this.state.skills,
githubusername: this.state.githubusername,
bio: this.state.bio,
twitter: this.state.twitter,
facebook: this.state.facebook,
linkedin: this.state.linkedin,
youtube: this.state.youtube,
instagram: this.state.instagram
}
this.props.onSubmit(profileData);
}
render() {
const { errors, displaySocialInputs } = this.state;
let socialInputs;
if (displaySocialInputs) {
socialInputs = (
<div>
<InputGroup
placeholder="Twitter profile URL"
name="twitter"
icon="fab fa-twitter"
value={this.state.twitter}
onChange={this.onChange}
error={errors.twitter}
/>
<InputGroup
placeholder="Facebook profile URL"
name="facebook"
icon="fab fa-facebook"
value={this.state.facebook}
onChange={this.onChange}
error={errors.facebook}
/>
<InputGroup
placeholder="LinkedIn profile URL"
name="linkedin"
icon="fab fa-linkedin"
value={this.state.linkedin}
onChange={this.onChange}
error={errors.linkedin}
/>
<InputGroup
placeholder="YouTube channel URL"
name="youtube"
icon="fab fa-youtube"
value={this.state.youtube}
onChange={this.onChange}
error={errors.youtube}
/>
<InputGroup
placeholder="Instagram page URL"
name="instagram"
icon="fab fa-instagram"
value={this.state.instagram}
onChange={this.onChange}
error={errors.instagram}
/>
</div>
)
}
// select options for status
const options = [
{ label: '* Select professional status', value: '', disabled: 'disabled'},
{ label: 'developer', value: 'developer' },
{ label: 'senior developer', value: 'senior developer' },
{ label: 'manager', value: 'manager' },
{ label: 'student or learning', value: 'student or learning' },
{ label: 'instructor or teacher', value: 'instructor or teacher' },
{ label: 'intern', value: 'intern' },
{ label: 'other', value: 'other' }
];
return (
<div className="create-profile">
<div className="container">
<div className="row">
<div className="col-md-8 m-auto">
{this.state.handle && <Link to="/dashboard" className="btn btn-light">Go to dashboard</Link>}
<h1 className="display-4 text-center">Edit your profile</h1>
{!this.state.handle && <p className="lead text-center">Lets get some information to make your profile stand out</p>}
<small className="d-block pb-3">* = required fields</small>
<form onSubmit={this.onSubmit}>
<TextFieldGroup
placeholder="* Profile Handle"
name="handle"
value={this.state.handle}
onChange={this.onChange}
error={errors.handle}
info="A unique handle for your profile URL. Your full name, company name, nickname, etc."
/>
<SelectListGroup
placeholder="Status"
name="status"
value={this.state.status}
onChange={this.onChange}
options={options}
error={errors.status}
info="Give us an idea where you are at in your career"
/>
<TextFieldGroup
placeholder="Company"
name="company"
value={this.state.company}
onChange={this.onChange}
error={errors.company}
info="Could be your own company or one you work for"
/>
<TextFieldGroup
placeholder="Website"
name="website"
value={this.state.website}
onChange={this.onChange}
error={errors.website}
info="Could be your own website or a company one"
/>
<TextFieldGroup
placeholder="Location"
name="location"
value={this.state.location}
onChange={this.onChange}
error={errors.location}
info="City or city & state suggested (e.g. Boston, MA)"
/>
<TextFieldGroup
placeholder="Skills"
name="skills"
value={this.state.skills}
onChange={this.onChange}
error={errors.skills}
info="Please use comma separated values (e.g. HTML, CSS, JS, PHP)"
/>
<TextFieldGroup
placeholder="Github username"
name="githubusername"
value={this.state.githubusername}
onChange={this.onChange}
error={errors.githubusername}
info="If you want your latest repos and a Github link, include your username"
/>
<TextAreaFieldGroup
placeholder="Short bio"
name="bio"
value={this.state.bio}
onChange={this.onChange}
error={errors.bio}
info="Tell us a little about yourself"
/>
<div className="mb-3">
<button type="button"
onClick={() => this.setState((prevState) => ({ displaySocialInputs: !prevState.displaySocialInputs }))}
className="btn btn-light">Add social network links
</button>
<span className="text-muted">Optional</span>
</div>
{socialInputs}
<input type="submit" value="Submit" className="btn btn-info btn-block mt-4" />
</form>
</div>
</div>
</div>
</div>
);
}
}
ProfileForm.propTypes = {
profile: PropTypes.object.isRequired,
errors: PropTypes.object.isRequired
};
export default ProfileForm;
我相信value构造函数中TextFieldGroup，SelectListGroup，TextAreaFieldGroup的{{1}}字段将被设置为''，但会收到警告类似于
ProfileForm，其他输入组件也使用相同的警告。最终得到这个
Failed prop type: The prop `value` is marked as required in `TextAreaFieldGroup`, but its value is `undefined`.
我在哪里错了？
答案 0 :(得分：0)
您在EditProfile中获得的道具未在
中声明 this.state = {
}
。 React - changing an uncontrolled input之前已经回答了这个问题。
查看您的父组件。当您未设置对象的状态并将其用作 input 或 select 标记中的值时，将显示此错误。
答案 1 :(得分：0)
原因可能是TextFieldGroup，而其他类似组件在value={this.state.<prop_name>}构造函数参与设置ProfileForm上的状态之前，已用ProfileForm进行了初始化。
仅在页面刷新上加载EditProfile组件时才会发生该错误。如果我来自带有用户个人资料的页面，则没有错误。