Created
June 26, 2018 15:42
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HTML5 Validation with React.
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import React, { Component } from 'react'; | |
class FormTest extends Component { | |
constructor(props) { | |
super(props); | |
this.state = { | |
username: { | |
value: '', | |
valid: false, | |
errorMessage: '' | |
}, | |
password: { | |
value: '', | |
valid: false, | |
errorMessage: '' | |
}, | |
form: { | |
valid: false | |
} | |
} | |
} | |
onInputChange(event) { | |
const targetName = event.target.name; | |
const targetValue = event.target.value; | |
const el = this.refs[targetName]; | |
this.setState({ | |
[targetName]: { | |
value: targetValue, | |
valid: el.validity.valid, | |
errorMessage: el.validity.valueMissing ? `${targetName} is required` : el.validationMessage | |
}, | |
form: { | |
valid: this.form.checkValidity() | |
} | |
}); | |
} | |
onSubmit(event) { | |
} | |
returnErrorMessage(inputType) { | |
let obj = this.state[inputType]; | |
return ( | |
<span> | |
{!obj.valid && obj.errorMessage} | |
</span> | |
); | |
} | |
render() { | |
return ( | |
<div> | |
<div>Form Test</div> | |
<form onSubmit={this.onSubmit.bind(this)} ref={form => this.form = form}> | |
<input ref='username' type="text" value={this.state.username.value} onChange={this.onInputChange.bind(this)} name='username' required/> | |
{this.returnErrorMessage('username')} | |
<br/><br/> | |
<input ref='password' type="password" value={this.state.password.value} onChange={this.onInputChange.bind(this)} name='password' required/> | |
{this.returnErrorMessage('password')} | |
<br/><br/> | |
<button type="submit" disabled={!this.state.form.valid}>Submit</button> | |
</form> | |
</div> | |
); | |
} | |
} | |
export default FormTest; |
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