How to use SetFieldValue from outside render function? Formik

SetFieldValue from outside the form? Formik js

How can i use SetFieldValue() from outside the main function (render function)? I am trying to set the value of the input from another function and this input is required in the validation so I cannot leave it empty and set the value on form submit?
So I need to setFieldValue from the function called getPriceUsingID because this function gets the price from the backend, How can I set the value of the price field?

import React from 'react';
import * as Yup from 'yup';
import { Formik } from 'formik';
import {
 Button,
 Grid,
 TextField,
} from '@material-ui/core';
import axios from 'axios';

const PriceCalculator = ({
 className,
 ...rest
}) => {

 const getPriceUsingID = async (id) => {
 let res = await axios.get('//localhost/prices/'+id);
 let price = res.data.price;
 console.log(price);
 }

 return (
 <Formik
 enableReinitialize={true}
 initialValues={{
 productID: '',
 price: '',
 }}
 validationSchema={Yup.object().shape({
 productID: Yup.string().max(255).required('Amount is required'),
 price: Yup.string().max(255).required('Price is required'),
 })}
 onSubmit={async (values, {
 setErrors,
 setStatus,
 setSubmitting,
 }) => {
 try {
 console.log(values);
 } catch (err) {
 console.error(err);
 setStatus({ success: false });
 setErrors({ submit: err.message });
 setSubmitting(false);
 }
 }}
 >
 {({
 errors,
 handleBlur,
 handleChange,
 handleSubmit,
 isSubmitting,
 touched,
 values,
 setFieldValue
 }) => (
 <form
 onSubmit={handleSubmit}
 {...rest}
 >
 <Grid container> 
 <Grid container spacing={3}>
 <Grid item xs={12}>
 <TextField
 error={Boolean(touched.productID && errors.productID)}
 fullWidth
 helperText={touched.productID && errors.productID}
 label="Amount"
 name="productID"
 onBlur={handleBlur}
 value={values.productID}
 onChange={(e) => { handleChange(e); getPriceUsingID(e.target.value); }}
 variant="outlined"
 />
 </Grid>
 <Grid item xs={12}>
 <TextField
 error={Boolean(touched.price && errors.price)}
 fullWidth
 helperText={touched.price && errors.price}
 label="Price"
 name="price"
 value={values.price}
 onBlur={handleBlur}
 onChange={handleChange}
 variant="outlined"
 />
 </Grid>
 <Button
 color="secondary"
 disabled type="submit"
 variant="contained"
 size="large"
 >
 Submit
 </Button>
 </Grid>
 </Grid>
 </form>
 )}
 </Formik>
 );
};
export default PriceCalculator;

Mohamed Atef

3 Jul 2021

Hey Joseph, there are two ways to achieve this,
The first way is by using setFieldValue inside the form and pass the Product ID to the outside function and return the price exactly like what you did in the code above

 const getPriceUsingID = async (id) => {
 let res = await axios.get('//localhost/prices/'+id);
 let price = res.data.price;
 console.log(price);
 return price;
 }

and the onChange function gonna look like this

<TextField
 error={Boolean(touched.productID && errors.productID)}
 fullWidth
 helperText={touched.productID && errors.productID}
 label="Amount"
 name="productID"
 onBlur={handleBlur}
 value={values.productID}
 onChange={(e) => { handleChange(e); setFieldValue('price', getPriceUsingID(e.target.value)); }}
 variant="outlined"
/>

The second way is by passing the setFieldValue function to the outside function getPriceUsingID Like

 const getPriceUsingID = async (id, setFieldValue) => {
 let res = await axios.get('//localhost/prices/'+id);
 let price = res.data.price;
 console.log(price);
 setFieldValue('price', price);
 }

and the field function gonna look like this

<TextField
 error={Boolean(touched.productID && errors.productID)}
 fullWidth
 helperText={touched.productID && errors.productID}
 label="Amount"
 name="productID"
 onBlur={handleBlur}
 value={values.productID}
 onChange={(e) => { handleChange(e); getPriceUsingID(e.target.value, setFieldValue); }}
 variant="outlined"
/>

Note: you need to keep the price field as it is above, and it's gonna be fine,
Hope you could figure out your issue
Good Luck

Replies

Joseph Morgan

3 Jul 2021

Amazing, this is really what I need

How to use SetFieldValue from outside render function? Formik

SetFieldValue from outside the form? Formik js

Comments

Replies