I am trying to add a Material UI 'Select' to my Formik component, but can't pass the values to Formik's initialValues.
const [hours, setHours] = React.useState('');
const handleHourChange = ({ target }) => {
setHours(target.value);
};
<Formik
initialValues={{
price: '' //not Material UI. Works.
hours: hours //from Material UI
}}
<Form>
<label htmlFor={'price'}> Price </label>
<Field
name={'price'}
type="text" //this Field (not Material UI) works fine.
/>
//...
//the below, which is Material UI's
//doesn't send its values to Formik's initialValues
<FormControl className={classes.formControl}>
<InputLabel id="demo-simple-select-label">Hours</InputLabel>
<Select
name={'hours'} //I added this name prop but not sure it's making any difference
labelId="demo-simple-select-label"
id="demo-simple-select"
value={hours}
onChange={handleHourChange}>
<MenuItem value={60}>01</MenuItem>
<MenuItem value={120}>02</MenuItem>
</Select>
</FormControl>
</Form>
</Formik>
What could be done to fix this? I don't seem to know how to properly get Material UI's values to add them to Formik.
For material ui, you can use this great library https://github.com/stackworx/formik-material-ui
Here is their sample codesandbox https://codesandbox.io/s/915qlr56rp?file=/src/index.tsx
If you don't want to use their library, you can use Formik's component prop to use your custom component
Based on your comment request, I've written the code here at codesandbox https://codesandbox.io/s/react-formik-material-ui-select-huzv7?file=/src/App.js
I'm not sure why you have state variables for formik values. Those are handled by formik. We don't need to handle them manually.
import React from "react";
import { Formik, Form, Field } from "formik";
import {
Select,
InputLabel,
MenuItem,
FormControl,
Button
} from "@material-ui/core";
import "./styles.css";
const CustomizedSelectForFormik = ({ children, form, field }) => {
const { name, value } = field;
const { setFieldValue } = form;
return (
<Select
name={name}
value={value}
onChange={e => {
setFieldValue(name, e.target.value);
}}
>
{children}
</Select>
);
};
export default function App() {
/*
You don't need to handle the formik values as state.
Formik handles it itself
const [hours, setHours] = React.useState("");
const handleHourChange = ({ target }) => {
setHours(target.value);
};
*/
return (
<Formik
initialValues={{
price: "abcv", //not Material UI. Works.
hours: 60 //from Material UI
}}
onSubmit={(values, actions) => {
alert("values:" + JSON.stringify(values));
}}
>
<Form>
<label htmlFor={"price"}> Price </label>
<Field
name={"price"}
type="text" //this Field (not Material UI) works fine.
/>
<FormControl>
<InputLabel id="demo-simple-select-label">Hours</InputLabel>
<Field name="hours" component={CustomizedSelectForFormik}>
<MenuItem value={60}>01</MenuItem>
<MenuItem value={120}>02</MenuItem>
</Field>
</FormControl>
<Button type="submit">Submit</Button>
</Form>
</Formik>
);
}
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