withFormik()

Create a higher-order React component class that passes props and form handlers (the "FormikBag") into your component derived from supplied options.

Example

1 import React from 'react';
2 import { withFormik } from 'formik';
3 
4 const MyForm = props => {
5   const {
6     values,
7     touched,
8     errors,
9     handleChange,
10     handleBlur,
11     handleSubmit,
12   } = props;
13   return (
14     <form onSubmit={handleSubmit}>
15       <input
16         type="text"
17         onChange={handleChange}
18         onBlur={handleBlur}
19         value={values.name}
20         name="name"
21       />
22       {errors.name && touched.name && <div id="feedback">{errors.name}</div>}
23       <button type="submit">Submit</button>
24     </form>
25   );
26 };
27 
28 const MyEnhancedForm = withFormik({
29   mapPropsToValues: () => ({ name: '' }),
30 
31   // Custom sync validation
32   validate: values => {
33     const errors = {};
34 
35     if (!values.name) {
36       errors.name = 'Required';
37     }
38 
39     return errors;
40   },
41 
42   handleSubmit: (values, { setSubmitting }) => {
43     setTimeout(() => {
44       alert(JSON.stringify(values, null, 2));
45       setSubmitting(false);
46     }, 1000);
47   },
48 
49   displayName: 'BasicForm',
50 })(MyForm);

options

Reference

options

displayName?: string

When your inner form component is a stateless functional component, you can use the displayName option to give the component a proper name so you can more easily find it in React DevTools. If specified, your wrapped form will show up as Formik(displayName). If omitted, it will show up as Formik(Component). This option is not required for class components (e.g. class XXXXX extends React.Component {..}).

enableReinitialize?: boolean

Default is false. Control whether Formik should reset the form if the wrapped component props change (using deep equality).

handleSubmit: (values: Values, formikBag: FormikBag) => void | Promise<any>

Your form submission handler. It is passed your forms values and the "FormikBag", which includes an object containing a subset of the injected props and methods (i.e. all the methods with names that start with set<Thing> + resetForm) and any props that were passed to the wrapped component.

The "FormikBag":

• props (props passed to the wrapped component)
• resetForm
• setErrors
• setFieldError
• setFieldTouched
• setFieldValue
• setStatus
• setSubmitting
• setTouched
• setValues

Note: errors, touched, status and all event handlers are NOT included in the FormikBag.

IMPORTANT: If onSubmit is async, then Formik will automatically set isSubmitting to false on your behalf once it has resolved. This means you do NOT need to call formikBag.setSubmitting(false) manually. However, if your onSubmit function is synchronous, then you need to call setSubmitting(false) on your own.

isInitialValid?: boolean | (props: Props) => boolean

Deprecated in 2.x, use mapPropsToErrors instead

Control the initial value of isValid prop prior to mount. You can also pass a function. Useful for situations when you want to enable/disable a submit and reset buttons on initial mount.

mapPropsToErrors?: (props: Props) => FormikErrors<Values>

If this option is specified, then Formik will transfer its results into updatable form state and make these values available to the new component as props.errors initially. Useful for instantiating arbitrary error state into your form. As a reminder, props.errors will be overwritten as soon as validation runs. Formik will also reset props.errors to this initial value (and this function will be re-run) if the form is reset.

mapPropsToStatus?: (props: Props) => any

If this option is specified, then Formik will transfer its results into updatable form state and make these values available to the new component as props.status. Useful for storing or instantiating arbitrary state into your form. As a reminder, status will be reset to this initial value (and this function will be re-run) if the form is reset.

mapPropsToTouched?: (props: Props) => FormikTocuhed<Values>

If this option is specified, then Formik will transfer its results into updatable form state and make these values available to the new component as props.errors. Useful for instantiating arbitrary touched state (i.e. marking fields as visited) into your form. As a reminder, Formik will use this initial value (and this function will be re-run) if the form is reset.

mapPropsToValues?: (props: Props) => Values

If this option is specified, then Formik will transfer its results into updatable form state and make these values available to the new component as props.values. If mapPropsToValues is not specified, then Formik will map all props that are not functions to the inner component's props.values. That is, if you omit it, Formik will only pass props where typeof props[k] !== 'function', where k is some key.

Even if your form is not receiving any props from its parent, use mapPropsToValues to initialize your forms empty state.

validate?: (values: Values, props: Props) => FormikErrors<Values> | Promise<any>

Note: I suggest using validationSchema and Yup for validation. However, validate is a dependency-free, straightforward way to validate your forms.

Validate the form's values with function. This function can either be:

1. Synchronous and return an errors object.

1 // Synchronous validation
2 const validate = (values, props) => {
3   const errors = {};
4 
5   if (!values.email) {
6     errors.email = 'Required';
7   } else if (!/^[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,4}$/i.test(values.email)) {
8     errors.email = 'Invalid email address';
9   }
10 
11   //...
12 
13   return errors;
14 };

• Asynchronous and return a Promise that's resolves to an object containing errors

1 // Async Validation
2 const sleep = ms => new Promise(resolve => setTimeout(resolve, ms));
3 
4 const validate = (values, props) => {
5   return sleep(2000).then(() => {
6     const errors = {};
7     if (['admin', 'null', 'god'].includes(values.username)) {
8       errors.username = 'Nice try';
9     }
10     // ...
11     return errors;
12   });
13 };

validateOnBlur?: boolean

Default is true. Use this option to run validations on blur events. More specifically, when either handleBlur, setFieldTouched, or setTouched are called.

validateOnChange?: boolean

Default is true. Use this option to tell Formik to run validations on change events and change-related methods. More specifically, when either handleChange, setFieldValue, or setValues are called.

validateOnMount?: boolean

Default is false. Use this option to tell Formik to run validation (at low priority) when the wrapped component mounts and/or initialValues change.

validationSchema?: Schema | ((props: Props) => Schema)

A Yup schema or a function that returns a Yup schema. This is used for validation. Errors are mapped by key to the inner component's errors. Its keys should match those of values.

Injected props and methods

These are identical to the props of <Formik render={props => ...} />