how to use react number format with formik

Question

My formik form is like this

const NewProduct = ({}) => {
    const validate = (values) => {
        const errors = {}
        if (!values.title) {
            errors.title = 'Required'
        }
        return errors
    }
    const formik = useFormik({
        initialValues: {
            title: '',
            price: '',
        },
        validate,
        onSubmit: (values) => {
            alert(JSON.stringify(values, null, 2))
        },
    })

    return (
        <div className="newProductComponent">
            <form onSubmit={formik.handleSubmit}>
                <label>title</label>
                <input
                    type="text"
                    id="title"
                    name="title"
                    onChange={formik.handleChange}
                    value={formik.values.title}
                />
                {formik.errors.title ? (
                    <div className="error">{formik.errors.title}</div>
                ) : null}

                <NumberFormat
                    value={formik.values.price}
                    thousandSeparator={true}
                    onValueChange={(values) => {
                        const { formattedValue, value } = values
                    }}
                />
            </form>
        </div>
    )
}

How can I get number format component in that form to work with formik?

Answer 1

useFormik - the hook you're already using - returns a function setFieldValue that can be used to manually set a value.

First arg is field name price and second is the value. You also must set attribute name="price" on <NumberFormat>.

const App = () => {
  const validate = (values) => {
      const errors = {}
      if (!values.title) {
          errors.title = 'Required'
      }
      return errors
  }
  const formik = useFormik({
      initialValues: {
          title: '',
          price: '',
      },
      validate,
      onSubmit: (values) => {
          alert(JSON.stringify(values, null, 2))
      },
  })

  return (
      <div className="newProductComponent">
          <form onSubmit={formik.handleSubmit}>
              <label>title</label>
              <input
                  type="text"
                  id="title"
                  name="title"
                  onChange={formik.handleChange}
                  value={formik.values.title}
              />
              {formik.errors.title ? (
                  <div className="error">{formik.errors.title}</div>
              ) : null}
              <br />
              <label>Price</label>
              <NumberFormat
                  name="price"
                  value={formik.values.price}
                  thousandSeparator={true}
                  onValueChange={(values) => {
                      const {  value } = values;
                      formik.setFieldValue('price', value);
                  }}
              />
              <br />
              <button type="submit">Submit</button>
          </form>
      </div>
  )
};

Live Demo