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class SignUpForm extends React.Component { | |
constructor(props) { | |
super(props); | |
this.state = { | |
email: null, | |
username: null, | |
errorMessages: { // This is new -- if we don't set these defaults, render() will thrown an error | |
email: [], | |
username: [] | |
} | |
}; | |
this._change = this._change.bind(this); | |
this._validate = this._validate.bind(this); | |
} | |
_change(e) { | |
this.setState({ | |
[e.target.name]: e.target.value | |
}); | |
} | |
_validate() { | |
let valid = true; | |
let { username, email } = this.state; | |
let errorMessages = { | |
username: [], | |
email: [] | |
}; | |
if (username === null || username === '') { | |
valid = false; | |
errorMessages['username'].push('Username is required'); | |
} | |
if (email === null || email === '') { | |
valid = false; | |
errorMessages['email'].push('Email is required'); | |
} | |
this.setState({ | |
errorMessages: errorMessages | |
}); | |
if (valid) { | |
// Don't forget to POST this form or something! | |
} | |
} | |
render() { | |
return( | |
<form> | |
(*) Usernane: <input type='text' name='username' value={this.state.username} onChange={this._change} /> | |
<div className='error'>{this.state.errorMessages.username.join('. ')}</div> | |
(*) Email: <input type='email' name='email' value={this.state.email} onChange={this._change} /> | |
<div className='error'>{this.state.errorMessages.email.join('. ')}</div> | |
<button onClick={this._validate}>Submit</button> | |
</form> | |
); | |
} | |
} |
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