Cannot read property 'values' of undefined

[pgrekovich]

One of these days there was this error. Any idea what might be the problem?

[latviancoder]

formik is using new Provider/Consumer from react 16.3, while this library still relies on old context api.

@jaredpalmer are you planning on updating this?

[maticrivo]

@jaredpalmer any update or plans on this?

[pgrekovich]

@maticrivo I had spent time to understand it, and in real life, you don't need it! Try to use componentDidUpdate if you need to update something after the form has updated.

[maticrivo]

@pgrekovich componentDidUpdate will only work if I use formik as an HOC with withFormik but i use formik with a render prop

[NamPNQ]

Just use connect api
Here is my solution

// @flow
import React from 'react';
import { connect } from 'formik';

type Props = {
  onChange: Function,
  formik: Object,
};

class Effect extends React.Component<Props> {
  componentWillReceiveProps(nextProps) {
    const { values, touched, errors, isSubmitting } = this.props.formik;
    const {
      values: nextValues,
      touched: nextTouched,
      errors: nextErrors,
      isSubmitting: nextIsSubmitting,
    } = nextProps.formik;
    if (nextProps.formik !== this.props.formik) {
      this.props.onChange(
        {
          values,
          touched,
          errors,
          isSubmitting,
        },
        {
          values: nextValues,
          touched: nextTouched,
          errors: nextErrors,
          isSubmitting: nextIsSubmitting,
        },
      );
    }
  }

  // eslint-disable-next-line
  render() {
    return null;
  }
}

export default connect(Effect);

[sreeram-muddu]

@jaredpalmer any update on this issue?

[luke-dare]

Hey .. I've got the same issue.

[h0jeZvgoxFepBQ2C]

@jaredpalmer ping, same issue here

[brandonhall]

My solution was very similar to @NamPNQ and works great for us:

import { Component } from 'react';
import { debounce, isEqual } from 'lodash';
import { connect, FormikValues, FormikProps } from 'formik';

interface IProps {
  onChange: (values: FormikValues) => void;
}

interface IPropsEnhanced extends IProps {
  formik: FormikProps<FormikValues>;
}

const SAVE_DELAY = 1000;

class FormikEffects extends Component<IPropsEnhanced> {
  onChange = debounce(this.props.onChange, SAVE_DELAY);

  componentDidUpdate(prevProps: IPropsEnhanced) {
    const { formik } = this.props;
    const { isValid } = formik;

    const hasChanged = !isEqual(prevProps.formik.values, formik.values);
    const shouldCallback = isValid && hasChanged;

    if (shouldCallback) {
      this.onChange(formik.values);
    }
  }

  render() {
    return null as null;
  }
}

export default connect<IProps>(FormikEffects);

[Ridder90]

@brandonhall Thanks for sharing! Using your example gives me IProps is not defined. Did you define it somewhere else?

[brandonhall]

@Ridder90 No, it's defined at the top of the file as a TypeScript interface.

[Ridder90]

Hmmm strange...running it with export default connect(FormikEffects); works perfectly though.

[sebastianpatten]

Any eta when this will be fixed? I'm getting the same issue

[BrianBusby]

Same here; would love a fix for this

[aronkof]

Just use connect api
Here is my solution

// @flow
import React from 'react';
import { connect } from 'formik';

type Props = {
  onChange: Function,
  formik: Object,
};

class Effect extends React.Component<Props> {
  componentWillReceiveProps(nextProps) {
    const { values, touched, errors, isSubmitting } = this.props.formik;
    const {
      values: nextValues,
      touched: nextTouched,
      errors: nextErrors,
      isSubmitting: nextIsSubmitting,
    } = nextProps.formik;
    if (nextProps.formik !== this.props.formik) {
      this.props.onChange(
        {
          values,
          touched,
          errors,
          isSubmitting,
        },
        {
          values: nextValues,
          touched: nextTouched,
          errors: nextErrors,
          isSubmitting: nextIsSubmitting,
        },
      );
    }
  }

  // eslint-disable-next-line
  render() {
    return null;
  }
}

export default connect(Effect);

Thanks, it works as expected :)

[leechingching]

My solution was very similar to @NamPNQ and works great for us:

import { Component } from 'react';
import { debounce, isEqual } from 'lodash';
import { connect, FormikValues, FormikProps } from 'formik';

interface IProps {
  onChange: (values: FormikValues) => void;
}

interface IPropsEnhanced extends IProps {
  formik: FormikProps<FormikValues>;
}

const SAVE_DELAY = 1000;

class FormikEffects extends Component<IPropsEnhanced> {
  onChange = debounce(this.props.onChange, SAVE_DELAY);

  componentDidUpdate(prevProps: IPropsEnhanced) {
    const { formik } = this.props;
    const { isValid } = formik;

    const hasChanged = !isEqual(prevProps.formik.values, formik.values);
    const shouldCallback = isValid && hasChanged;

    if (shouldCallback) {
      this.onChange(formik.values);
    }
  }

  render() {
    return null as null;
  }
}

export default connect<IProps>(FormikEffects);

It works as expected, but the console shows the warming below

react-dom.development.js:506 Warning: A component is changing an uncontrolled input of type undefined to be controlled. Input elements should not switch from uncontrolled to controlled (or vice versa). Decide between using a controlled or uncontrolled input element for the lifetime of the component. More info: https://fb.me/react-controlled-components

Do you have any ideas how to solve it ?

[NamPNQ]

@leechingching it's not related with this issue, you can check the guide in https://fb.me/react-controlled-components, may be your component dont set value back in input

[jariz]

Here's my version recreating formik-effect with hooks in 11 lines.
See here for TS version.

import { connect } from 'formik';
import { useEffect, useRef } from 'react';
const Effect = ({ formik, onChange }) => {
    const ref = useRef(null);
    useEffect(() => {
        onChange(formik, ref.current);
        ref.current = formik;
    }, [formik]);
    return null;
};
export default connect(Effect);