React Formik does not work with number input

Question

Using Formik with Ant Design, here is a simple setup.

You can see the entire code pasted here:

import React from "react";
import ReactDOM from "react-dom";

import "./styles.css";

import { Formik } from "formik";
import { Form, Input, InputNumber } from "antd";

function App() {
  const name = "name";
  const count = "count";

  return (
    <div className="App">
      <h1>Formik Testing</h1>

      <Formik
        initialValues={{ count: 32, name: "sd" }}
        validate={async values => {
          console.log("Validate", values);
          return {
            count: `Value ${values.count} is not valid.`
          };
        }}
        onSubmit={(values, actions) => {
          console.log(values);
        }}
        render={props => {
          return (
            <div>
              <Form>
                <Form.Item help={props.errors && props.errors[name]}>
                  <Input
                    id={name}
                    name={name}
                    type={"text"}
                    onChange={v => {
                      console.log("Text change ", v);
                      props.handleChange(v);
                    }}
                    onBlur={props.handleBlur}
                    defaultValue={props.initialValues[name]}
                    placeholder="Name"
                  />
                </Form.Item>
                <Form.Item help={props.errors && props.errors[count]}>
                  <InputNumber
                    id={count}
                    name={count}
                    type={"number"}
                    onChange={v => {
                      console.log("Number change ", v);
                      props.handleChange(v);
                    }}
                    onBlur={props.handleBlur}
                    defaultValue={props.initialValues[count]}
                    placeholder="Count"
                  />
                </Form.Item>
              </Form>
            </div>
          );
        }}
      />
    </div>
  );
}

const rootElement = document.getElementById("root");
ReactDOM.render(<App />, rootElement);

So basically:

• handleChange is called correctly by the InputNumber component
• validation is not triggered when the number field changes
• validation is triggered when the text field changes
• validation is triggered with the default value when onblur (after clicking away from the input number field)

This seems like a bug, but I assume I am doing something wrong.

Any help is appreciated.

---

Code in action:

https://codesandbox.io/s/gallant-architecture-0c8p2

(The preview css seems to have a bug - in case you see multiple arrows, use the top one only)

Answer 1

You can use Formik's built in setFieldValue function to define your own change handler for the input which will set the number value directly:

           <InputNumber
                    id={count}
                    name={count}
                    type={"number"}
                    onChange={v => {
                      props.setFieldValue(count, v);
                    }}
                    onBlur={props.handleBlur}
                    defaultValue={props.initialValues[count]}
                    placeholder="Count"
                  />

According to the docs it also has a third boolean argument to determine whether or not to run validation. So passing in true after v should trigger validation if validateOnChange is enabled on the main Formik component.