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Joseph Morgan
Published in : 2021-07-03

How to use SetFieldValue from outside render function? Formik

React js

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;

 

Comments

Mohamed Atef Date : 2021-07-03

Best answers

51

Best answers

51

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

Joseph Morgan Date : 2021-07-03

Amazing, this is really what I need 

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