How to use custom Input with Formik in React?

问题

I'm trying to use DatePicker within Formik. But when I click DatePicker's date its form value is not changed. Instead, I got this error:

Uncaught TypeError: e.persist is not a function at Formik._this.handleChange (formik.es6.js:5960)

I shortify code, the code is below

const SomeComponent = () => (
    <Formik
        render={({
            values,
            handleSubmit,
            handleChange,
            setFieldValue
        }) => {
            return (
                <div>
                    <form onSubmit={handleSubmit}>
                        <DatePicker
                            name={'joinedAt'}
                            value={values['joinedAt']}
                            onChange={handleChange}
                        />
                    </form>
                </div>
            )
        }}
    />
)

I googled few documents, https://github.com/jaredpalmer/formik/issues/187 and https://github.com/jaredpalmer/formik/issues/86

So I tried like below, but it's not working.

 ...setFieldValue

 <DatePicker
   name={'joinedAt'}
   value={values['joinedAt']}
   onChange={setFieldValue}
 />

回答1:

I resolve this like

<DatePicker
   name={'joinedAt'}
   value={values['joinedAt']}
   onChange={e => setFieldValue('joinedAt', e)}
 />

回答2:

For html primitive input fields handleChange works like a charm, but for custom components, you've to use setFieldValue to change the value imperatively.

onChange={e => setFieldValue('joinedAt', e)}

回答3:

The accepted answer didn't work for me and didn't show the selected date. It has been almost a year so there might be some changes with the implementation. Though this can be fix by using toDateString() like this

<DatePicker
   name={'joinedAt'}
   value={values['joinedAt']}
   onChange={e => setFieldValue('joinedAt', e.toDateString())}
 />

回答4:

If you have deeper nesting, you should use Formik Field. Example:


<Formik
    validationSchema={schema}
    initialValues={initialValues}
    onSubmit={(values, actions) => {}}
>

  <Field name="colors" component={ColorsEditor}  colors={colorArray}/>
</Formik>


const ColorsEditor = ({ field, colors, form, ...props }) => {

    return (
        <div>
            <Button onClick={() => form.setFieldValue('colors', "myValue")}>
            </Button>
        </div>
    )
}

So the Field component already include the form, where live the setFieldValue that you can use where you need. It also include the errors and needed fields for additional customization.

回答5:

https://github.com/jaredpalmer/formik/issues/692

you need to set value manually if you are using setFieldValue method

来源：https://stackoverflow.com/questions/52271766/how-to-use-custom-input-with-formik-in-react

标签

reactjs

react-native

material-ui

formik