field required redux form code example
Example: redux form make field required
import React from 'react'
import { Field, reduxForm } from 'redux-form'
const required = value => value ? undefined : 'Required'
const maxLength = max => value =>
value && value.length > max ? `Must be ${max} characters or less` : undefined
const maxLength15 = maxLength(15)
const number = value => value && isNaN(Number(value)) ? 'Must be a number' : undefined
const minValue = min => value =>
value && value < min ? `Must be at least ${min}` : undefined
const minValue18 = minValue(18)
const email = value =>
value && !/^[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,4}$/i.test(value) ?
'Invalid email address' : undefined
const tooOld = value =>
value && value > 65 ? 'You might be too old for this' : undefined
const aol = value =>
value && /.+@aol\.com/.test(value) ?
'Really? You still use AOL for your email?' : undefined
const renderField = ({ input, label, type, meta: { touched, error, warning } }) => (
<div>
<label>{label}</label>
<div>
<input {...input} placeholder={label} type={type}/>
{touched && ((error && <span>{error}</span>) || (warning && <span>{warning}</span>))}
</div>
</div>
)
const FieldLevelValidationForm = (props) => {
const { handleSubmit, pristine, reset, submitting } = props
return (
<form onSubmit={handleSubmit}>
<Field name="username" type="text"
component={renderField} label="Username"
validate={[ required, maxLength15 ]}
/>
<Field name="email" type="email"
component={renderField} label="Email"
validate={email}
warn={aol}
/>
<Field name="age" type="number"
component={renderField} label="Age"
validate={[ required, number, minValue18 ]}
warn={tooOld}
/>
<div>
<button type="submit" disabled={submitting}>Submit</button>
<button type="button" disabled={pristine || submitting} onClick={reset}>Clear Values</button>
</div>
</form>
)
}
export default reduxForm({
form: 'fieldLevelValidation'
})(FieldLevelValidationForm)