how i should use react hook useState with post axios - reactjs

I try call request post with hooks. Firstly, a call request post using this.setState and it working correctly
but I want to use a hook (useState) instead of setState and it doesn't work
code below working correctly
export default class AddShoes extends Component {
constructor(props) {
super(props);
this.state = this.startValue;
this.state.show = false;
this.shoesChange = this.shoesChange.bind(this);
}
startValue = {
brand: "",
model: "",
date: "",
price: "",
img: "",
};
shoesChange = (event) => {
this.setState({
[event.target.name]: event.target.value,
});
};
submitShoes = (event) => {
event.preventDefault();
const shoes = {
brand: this.state.brand,
model: this.state.model,
date: this.state.date,
price: this.state.price,
img: this.state.img,
};
axios.post("http://localhost:8080/api", shoes).then((response) => {
if (response.data != null) {
this.setState(this.startValue);
alert("added")
}
});
};
the second code below doesn't work
export default function AddShoes() {
const [values, setValues] = useState({
brand: "",
model: "",
date: "",
price: "",
img: "",
});
// const [show, setShow] = useState(false);
const handleSetInputs = (e) => {
setValues({ ...values, [e.target.name]: e.target.value });
};
const submitShoes = (event) => {
event.preventDefault();
axios.post("http://localhost:8080/api", values)
.then((response) => {
if (response.data != null) {
setValues(response.data);
alert("added!");
}
});
};
what I should change?

To just change one property from an state-object in React Hooks you have to do this:
setValues(prevValues => ({ ...prevValues, [e.target.name]: e.target.value }));

In the first example that works, you are resetting the state by calling this.setState(this.startValue)
In the second example, you are passing the result of the network request inside setValue setValues(response.data)
Create initialValues outside of AddShoes function component.
const initialValues = {
brand: "",
model: "",
date: "",
price: "",
img: "",
}
Now pass that into setValues inside submitShoes
const submitShoes = (event) => {
event.preventDefault();
axios.post("http://localhost:8080/api", values)
.then((response) => {
if (response.data != null) {
setValues(initialValues);
alert("added!");
}
});
};

Related

React formReducer in context causing rerender with each keystroke

I am trying to architecture a React form which uses functions and data from context.
I have a formReducer which is used by one of the context state values.
export const FormContext = createContext({});
function formReducer(state, event) {
if (event.name.startsWith("address") && event.name.split(".").length > 1) {
var updateField = event.name.split(".")[1];
return {
...state,
address: { ...state.address, [updateField]: event.value },
};
} else if (
event.name.startsWith("hours") &&
event.name.split(".").length > 1
) {
var updateField = event.name.split(".")[1];
return {
...state,
hours: { ...state.hours, [updateField]: event.value },
};
}
return {
...state,
[event.name]: event.value,
};
}
export const FormProvider = (props) => {
const { children } = props;
const [isSubmitting, setIsSubmitting] = useState(false);
const [formData, setFormData] = useReducer(formReducer, {
name: "",
address: { line1: "", city: "", state: "", zip: "" },
phone: "",
contact: "",
hours: {
monday_start: "",
tuesday_start: "",
wednesday_start: "",
thursday_start: "",
friday_start: "",
saturday_start: "",
sunday_start: "",
monday_end: "",
tuesday_end: "",
wednesday_end: "",
thursday_end: "",
friday_end: "",
saturday_end: "",
sunday_end: "",
},
});
const [page, setPage] = useState(1);
const [showModal, setShowModal] = useState(false);
function fetchClientData(id) {
return fetch(
`api-call`
)
}
function handleSubmit(e) {
e.preventDefault();
fetch(
"api-call",
{
method: "POST",
headers: {
"Content-Type": "application/json",
},
body: JSON.stringify({ ...formData, page: page }),
}
)
}
const formContext = {
fetchClientData,
formData,
setFormData,
};
return (
<FormContext.Provider value={formContext}>{children}</FormContext.Provider>
);
};
In my form component I pull in these values from context
const {
fetchClientData,
formData,
handleSubmit,
isSubmitting,
page,
setFormData,
setIsSubmitting,
setPage,
setShowModal,
showModal,
} = useContext(FormContext);
And anytime an input field changes I update the context state.
function handleChange(e) {
const { name, value } = e.target;
setFormData({
name: name,
value: value,
});
}
If I understand context correctly components that consume context will rerender each time a context state changes.
I am wondering how I can better design my app to avoid this problem. Ideally I don't want to bog down my component with all of these functions and state variables, but I also don't want my component to constantly rerender.

Issue with POST using React

Hello I am newer at react but I am getting an error when I am trying to POST and I think that it is my changeHandler Wondering if someone can see something that I don't.
import React, {Component} from 'react'
import axios from 'axios'
class Form extends Component{
constructor(props) {
super(props)
this.state = {
appointment:{
customer_first_name: "",
customer_last_name: "",
date: "",
email: "",
notes: "",
phone: "",
time: ""
}
}
}
changeHandler = e => {
var appointment = { ...this.state.appointment };
appointment.[e.target.name] = e.target.value;
this.setState({appointment})
}
submitHandler = e => {
e.preventDefault()
console.log(this.state)
axios
.post('test/api', this.state.appointment)
.then(response => {
console.log(response)
})
.catch(error => {
console.log(error)
})
There is a syntactical error in your changeHandler. If you are using the bracket notation, then you do not use a dot:
// wrong
appointment.[e.target.name] = e.target.value;
// right
appointment[e.target.name] = e.target.value;
Besides, you can combine the deconstruction and assignment operation as follows:
changeHandler = e => {
var appointment = { ...this.state.appointment, [e.target.name]: e.target.value };
this.setState({appointment})
}
Note that because the assignment comes after the deconstruction, if a variable with the same name already exists, it is overwritten by the new value as set by [e.target.name]: e.target.value.

Updating Multiple React State within the same event handler

These are my states using hooks:
const [adminProfile, setProfile] = useState({
locations: [],
});
const [location, setLocation] = useState({
locationName: "",
location: {},
locationPhone: "",
locationEmail: "",
staff: [],
multipleKitchens: false,
kitchens: [],
});
const [locationList, setLocationList] = useState([]);
const [locationAddress, setAddress] = useState({
streetAddress: "",
streetAddress2: "",
city: "",
state: "",
zip: "",
country: "USA"
});
I have a bunch of fields with onChange handlers and an onClick handler that needs to update 3 states in order. First, LocationAddress has to become the state of the location property within the location state. Second, the location state has to be updated with a unique ID, and then that unique ID is inserted into the array in the locationList state. Finally, the entire array from locationList state is added to the locations property of adminProfile state. These are all in one component.
const handleClickLocation = () => {
setLocation(prevValue => ({
...prevValue,
locationID: uuidv4(),
location: locationAddress
}));
setLocationList(prevValue => [...prevValue, location.locationID]);
setProfile(prevValue => ({
...prevValue,
locations: locationList
}))
The first time the click handler is triggered, it sets only the first state in the handler and sends "undefined" into the second state. When the click handler is clicked a second time, it then behaves normally. I want all the states to update simultaneously. I've tried forceUpdate(), but couldn't figure out the syntax. I've tried using ReactDOM.unstable_batchedUpdates but it still behaved the same.
How can I get this to work? I want to keep this within one component. Is that possible?
Here is the entire code updated with the useEffect hook:
import React, {useState, useEffect} from "react";
import axios from "axios";
const { v4: uuidv4 } = require('uuid');
const CompanyProfileInfo = (props) => {
const todayDate = () => {
let today = new Date();
let day = today.getDate();
let month = today.getMonth() + 1;
let year = today.getFullYear();
if (day < 10) day = '0' + day;
if(month < 10) month = '0' + month;
return (month + "/" + day + "/" + year);
}
const [adminProfile, setProfile] = useState({
companyID: props.companyInfo.companyID,
firstName: "",
lastName: "",
phonePrimary: "",
phoneSecondary: "",
emailSecondary: "",
streetAddress: "",
streetAddress2: "",
city: "",
state: "",
zip: "",
country: "USA",
multipleLocations: false,
locations: [],
membershipLevel: "Basic",
joinedDate: todayDate(),
});
const [location, setLocation] = useState({
locationName: "",
locationPhone: "",
locationEmail: "",
staff: [],
multipleKitchens: false,
kitchens: [],
});
const [locationAddress, setAddress] = useState({
streetAddress: "",
streetAddress2: "",
city: "",
state: "",
zip: "",
country: "USA"
});
const [locationList, setLocationList] = useState([]);
useEffect(() => {
setLocationList(prevValue => [...prevValue, location.locationID]);
}, [location.locationID]);
useEffect(() => {
if (locationList[0] === undefined) {
{locationList.shift()}
}
setProfile(prevValue => ({
...prevValue,
locations: locationList
})
)
}, [locationList])
const handleChange = (event) => {
const {name, value} = event.target;
setProfile(prevValue => ({
...prevValue,
[name]: value
}))
}
const handleChangeLocations = (event) => {
const {name, value} = event.target;
setLocation(prevValue => ({
...prevValue,
[name]: value
}));
};
const handleChangeLocations1 = (event) => {
const {name, value} = event.target;
setAddress(prevValue => ({
...prevValue,
[name]: value
}));
};
const handleClickLocation = () => {
setLocation(prevValue => ({
...prevValue,
locationID: uuidv4(),
location: locationAddress,
}));
};
const handleClick = () => {
axios.post('http://localhost:3001/profileinfo', adminProfile)
.then(res => {
props.supportFunctions.setUpLocations(res);
})
.catch(function (error) {
console.log(error);
})
}
return (
<div>
</div>
)
}
export default CompanyProfileInfo;
setState is asynchronous, it means that when it is called, its state won't update at the same time, it takes some time to perform its action.
You can make use of useEffect to do that.
useEffect will perform an action only when the specified state (inside brackets) changes
useEffect(() => {
setLocation({
...location,
location: locationAddress,
locationID: uuidv4()
})
}, [locationAddress]) //When locationAddress changes, setLocation
useEffect(() => {
setLocationList([
...locationList,
location.locationID
])
}, [location]) //When location changes, insert Id
Ps: You can have multiple useEffects in your code.
Updating of the state is asynchronous behavior, because of that you are getting locationID undefined for setLocationList.
Inside class component, we can use a callback to setState call like this -
this.setState({ data: newData }, () => { console.log("This will get printed after setState") })
But in your case, you are using function component so you have to use useEffect react hook to listen for changes in your data and then update other data in the state.
Take a look at this question - How to use `setState` callback on react hooks

how to update value in reactjs

constructor(props) {
super(props)
this.state = {
isEdit: false,
currentProduct : {
sku: '',
productName: '',
description: '',
duration: '',
},
}
}
handleChange = (e) => {
this.setState({
currentProduct: {
...this.state.currentProduct,
[e.target.name]: e.target.value
}
})
}
clickHandle = (e) => {
e.preventDefault()
const currentProduct = {...this.state.currentProduct}
currentProduct.id = this.props.match.params.id
this.props.updateProduct(currentProduct)
this.props.history.push('/')
}
When updating field it updates the values but when i goes again to update single value it update only that and removes the other don't know why
handleChange = (e) => {
this.setState({
...this.state.currentProduct,
[e.target.name]: e.target.value
})
}
you are not destructuring entire state first. so do ...state. otherwise isEdit field will be lost.
handleChange = e => {
this.setState({
...this.state,
currentProduct: {
...this.state.currentProduct,
[e.target.name]: e.target.value
}
});
};

use callback with useState hook in reactjs

i'm trying to update the user info on my database
on the handleChange function every time there is a new change but the problem that im facing is that i have to to wait for the setdata till it finish then updateUserInfo how i can solve that
const [mydata, setData] = useState({
user_gender: "",
user_relationship: "",
user_birth_day: "",
user_birth_month: "",
user_gender_interest: "",
user_birth_year: "",
user_interests: {
dancing: false,
family: false,
art: false,
photography: false,
friends: false,
travel: false
}
});
const handleChange = event => {
setData({
...mydata,
[event.target.name]: event.target.value
});
async function update() {
await updateUserInfo(mydata[event.target.name], stableDispatch);
}
update();
};
Call updateUserInfo() as a callback.
You can pass a function as a 2nd parameter to setState() which will automatically be called when the state is set.
useEffect(() => {
updateUserInfo(mydata[event.target.name], stableDispatch));
}, [mydata]);
The solution here is to copy the state in a variable which you can use to update state and the userInfo
const handleChange = event => {
const data = {
...mydata,
[event.target.name]: event.target.value
}
setData(data);
async function update() {
await updateUserInfo(data[event.target.name], stableDispatch);
}
update();
};

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