form validation in material ui code example

Example 1: material ui input validation

Extending Larry answer, set errorText to a property in state (errorText in below example). When the value in TextField changes, validate the entry and set the value of the property (errorText) to display and hide the error.

class PhoneField extends Component
  constructor(props) {
    super(props)
    this.state = { errorText: '', value: props.value }
  }
  onChange(event) {
    if (event.target.value.match(phoneRegex)) {
      this.setState({ errorText: '' })
    } else {
      this.setState({ errorText: 'Invalid format: ###-###-####' })
    }
  }
  render() {
    return (
      <TextField hintText="Phone"
        floatingLabelText="Phone"
        name="phone"
        errorText= {this.state.errorText}
        onChange={this.onChange.bind(this)}
      />
    )
  }
}

Example 2: material ui form control submit

import React from 'react'
import { Field, reduxForm } from 'redux-form'
import TextField from 'material-ui/TextField'
import { RadioButton, RadioButtonGroup } from 'material-ui/RadioButton'
import Checkbox from 'material-ui/Checkbox'
import SelectField from 'material-ui/SelectField'
import MenuItem from 'material-ui/MenuItem'
import asyncValidate from './asyncValidate'

const validate = values => {
  const errors = {}
  const requiredFields = [ 'firstName', 'lastName', 'email', 'favoriteColor', 'notes' ]
  requiredFields.forEach(field => {
    if (!values[ field ]) {
      errors[ field ] = 'Required'
    }
  })
  if (values.email && !/^[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,4}$/i.test(values.email)) {
    errors.email = 'Invalid email address'
  }
  return errors
}

const renderTextField = ({ input, label, meta: { touched, error }, ...custom }) => (
  <TextField hintText={label}
    floatingLabelText={label}
    errorText={touched && error}
    {...input}
    {...custom}
  />
)

const renderCheckbox = ({ input, label }) => (
  <Checkbox label={label}
    checked={input.value ? true : false}
    onCheck={input.onChange}/>
)

const renderRadioGroup = ({ input, ...rest }) => (
  <RadioButtonGroup {...input} {...rest}
    valueSelected={input.value}
    onChange={(event, value) => input.onChange(value)}/>
)

const renderSelectField = ({ input, label, meta: { touched, error }, children, ...custom }) => (
  <SelectField
    floatingLabelText={label}
    errorText={touched && error}
    {...input}
    onChange={(event, index, value) => input.onChange(value)}
    children={children}
    {...custom}/>
)

const MaterialUiForm = props => {
  const { handleSubmit, pristine, reset, submitting } = props
  return (
    <form onSubmit={handleSubmit}>
      <div>
        <Field name="firstName" component={renderTextField} label="First Name"/>
      </div>
      <div>
        <Field name="lastName" component={renderTextField} label="Last Name"/>
      </div>
      <div>
        <Field name="email" component={renderTextField} label="Email"/>
      </div>
      <div>
        <Field name="sex" component={renderRadioGroup}>
          <RadioButton value="male" label="male"/>
          <RadioButton value="female" label="female"/>
        </Field>
      </div>
      <div>
        <Field name="favoriteColor" component={renderSelectField} label="Favorite Color">
          <MenuItem value={'ff0000'} primaryText="Red"/>
          <MenuItem value={'00ff00'} primaryText="Green"/>
          <MenuItem value={'0000ff'} primaryText="Blue"/>
        </Field>
      </div>
      <div>
        <Field name="employed" component={renderCheckbox} label="Employed"/>
      </div>
      <div>
        <Field name="notes" component={renderTextField} label="Notes" multiLine={true} rows={2}/>
      </div>
      <div>
        <button type="submit" disabled={pristine || submitting}>Submit</button>
        <button type="button" disabled={pristine || submitting} onClick={reset}>Clear Values
        </button>
      </div>
    </form>
  )
}

export default reduxForm({
  form: 'MaterialUiForm',  // a unique identifier for this form
  validate,
  asyncValidate
})(MaterialUiForm)