I am trying to display a single user JSON API result through React.js code. This is my JSON response I get when I do console.log().
{"id":1,"email":"test.k#gmail.com","mobile":+989898989,"name":"testname K","address":"my address here, India","gender":"1","tagline":"Friendly to all"}
but when I try to print it as {singleUserDetail.name} it prints nothing. What is the issue here?
const [singleUserDetail, setsingleUserDetail] = React.useState('');
const id = user.id;
console.log(id); //getting id here as 1
const getsingleUserDetails = () => {
axios
.get(`http://localhost:3001/user/1`, { withCredentials: true })
.then((response) => {
const singleUserDetail = response.data;
console.log(response.data); //prints the above json reults in console
})
.catch((error) => {
console.log(" error", error);
});
};
React.useEffect(() => {
getsingleUserDetails();
}, []);
return (
<div>
<p>{singleUserDetail.name}</p>
</div>
);
}
singleUserDetail is your state, but you are assigning a new variable inside of the axios function. you should do this instead;
setSingleUserDetail(response.data)
Related
I chose to start learning API handling with POKEAPI. I am at a step where I need to get the flavor_text of each pokemon (the description let's say) but I can't for some reason.
Here is the JSON structure for one specific pokemon: https://pokeapi.co/api/v2/pokemon-species/bulbasaur.
And here is my useEffect trying to get it. The line fetching the habitat works and displays on my website so I guess my issue comes from my map in setDescription but I can't be sure.
export default function Card({ pokemon }, { key }) {
const src = url + `${pokemon.id}` + ".png";
const [habitat, setHabitat] = useState(null);
const [descriptions, setDescriptions] = useState([]);
useEffect(() => {
const controller = new AbortController();
axios
.get(url2 + `${pokemon.name}`, { signal: controller.signal })
.then((res) => setHabitat(res.data.habitat.name))
.then((res) =>
setDescriptions(
res.data.flavor_text_entries.map((ob) => ob.flavor_text)
)
)
.catch((err) => {
if (axios.isCancel(err)) {
} else {
console.log("warning your useEffect is behaving");
}
});
return () => {
// cancel the request before component unmounts
controller.abort();
};
}, [pokemon]);
I tried console logging descriptions or descriptions[0] but that doesn't work.
Since you only setting up the state from those data and it doesn't looks like the second result need to wait the result from the first to perform you can do both on the same response/promise :
useEffect(() => {
const controller = new AbortController();
axios
.get(url2 + `${pokemon.name}`, { signal: controller.signal })
.then((res) => {
setHabitat(res.data.habitat.name))
const flavorTextEntrieList = res.data.flavor_text_entries;
setDescriptions(flavorTextEntrieList.map((ob) => ob.flavor_text))
})
.catch((err) => {
if (axios.isCancel(err)) {
} else {
console.log("warning your useEffect is behaving");
}
});
return () => {
// cancel the request before component unmounts
controller.abort();
};
}, [pokemon]);
Each then need to return something to be handled in next chainable then. Replace .then((res) => setHabitat(res.data.habitat.name)) with .then((res) => { setHabitat(res.data.habitat.name); return res; })
I am trying to use Express + MongoDB building React app.
I was able to post some documents to MongoDB. Currently, I'm trying to figure out how to print fetched data to the screen.
I have these routes:
router.post('/totalbalance', (request, response) => {
const totalBalance = new TotalBalanceModelTemplate({
totalBalance:request.body.totalBalance,
});
totalBalance.save()
.then(data => {
response.json(data);
})
.catch(error => {
response.json(error);
});
});
router.get('/totalbalance', (request, response) => {
TotalBalanceModelTemplate.find(request.body.totalBalance, (error, data) => {
if (error) {
return error
} else {
response.json(data[0])
}
})
});
This is axios request:
useEffect(() => {
const resp = axios.get('http://localhost:4000/app/totalbalance');
console.log(resp);
}, []);
It returns a promise that has a parameter data which equals to object value which is the first value in the array
data: {_
id: "60c48b4ec60919553d92319f",
totalBalance: 5555,
__v: 0
}
and prints it out to the console.
How can I print out to the console the value totalBalance instead of whole promise?
By the way, sometime the array of data is empty (there are no documents in the DB), how should i handle these cases as well?
Thanks!
First of all, Axios GET method does not have any request body. But you are trying to use it in the MongoDB query. - "TotalBalanceModelTemplate.find(request.body.totalBalance, (error, data) => {".
The find query should be object {}. If require pass on conditions to it.
First point, to print only "totalBalance" output. Use, console.log(resp.totalBalance);
Second point, to handle records length, have a if else condition,
if (error) {
return error
} else if (data.length) {
return response.send("No records found")
} else {
response.json(data[0])
}
Try this :
Routes
router.post("/totalbalance", async (req, res) => {
try {
const totalBalance = new TotalBalanceModelTemplate({
totalBalance: req.body.totalBalance,
})
await totalBalance.save();
res.json(totalBalance)
} catch (error) {
res.status(400).json({
message: error.message
})
}
})
router.get("/totalbalance", async (req, res) => {
try {
const totalBalances = await TotalBalanceModelTemplate.find();
res.json(totalBalances)
} catch (error) {
res.status(400).json({
message: error.message
})
}
})
App.js
import React, { useState, useEffect } from 'react';
import axios from 'axios';
export default function App() {
const [data, setData] = useState([]);
const getData = async () => {
try {
const response = await axios.get('http://localhost:4000/app/totalbalance');
await setData(response);
} catch (error) {
console.log(error);
}
};
useEffect(() => {
getData();
}, []);
return (
<div>
{data <= 0 ? (
<div className="empty">
<p>No data!</p>
</div>
) : (
data.map((d) => (
<ul key={d.id}>
<li>{d.totalBalance}</li>
</ul>
))
)}
</div>
);
}
Im getting data from axios async function and trying to assign to state in same function. When I print the values on console, i see that temporary value is not null but state is always null. when i rerender the page, state is not being null.
const [Pickup, setPickUp] = useState([]);
async function GetOrders() {
const result = await axios(
`EXAMPLEURL`,
);
setOrders(result.data);
var temp = [];
result.data.allOrders.forEach(element => {
if (element.order_type === 'PickupOrders') {
temp.push(element);
}
});
console.log(temp);
if (Pickup !== temp) {
setPickUp(temp);
}
}
useEffect(() => {
GetOrders();
const interval = setInterval(() => {
GetOrders();
console.log(Pickup);
}, 1000 * 5);
return () => clearInterval(interval)
}, []);
On console:
How can i fix this problem?
I assume you want to make a get request. Your axios function need to be completed such as ;
await axios
.get("YOUR URL", {
headers: // if you need to add header,
})
.then((response) =>{
setOrders(reponse.data);
})
.catch((error) => {
result = { errorMessage: error.message };
console.error('There was an error!', error);
});
return result;
Not completely sure what you're trying to achieve, but you can't compare Pickup !== temp this will be false all the time, you're comparing object references. Js will return all the time those values aren't equal.
This function GetOrders return a promise you don't need to use interval, you can use GetOrders.then(lambdaFunctionHere -> ());
I'm very much new to react native currently i'm building small app for just getting an idea about this. I'm facing an issue in mapping the data from API. This is the json response returning from the api
{"data":[{"digit":300,"countsum":"52"},{"digit":301,"countsum":"102"},{"digit":302,"countsum":"27"},{"digit":303,"countsum":"201"},{"digit":500,"countsum":"101"}]}
When i tried to map this data i'm facing some issues. I stored the response from API to the state and when i tried to display the state data using map function it's showing the state value is null. This the code i tried till now
const [listdata, setListData] = useState(null)
useEffect(() => {
// Run! Like go get some data from an API.
getListData();
}, []);
const getListData = async () => {
const token = await AsyncStorage.getItem("#userToken")
axios
.get(constants.BASE_URL + "getlist?token=" +token)
.then(response => setListData(response.data))
.catch(error => {
console.log(error);
});
listdata.map(item => <Text>{item.digit}</Text>)
}
Do it like this,
export default function ComponentName () {
const [listdata, setListData] = useState([])
useEffect(() => {
// Run! Like go get some data from an API.
getListData();
}, []);
const getListData = async () => {
const token = await AsyncStorage.getItem("#userToken")
axios
.get(constants.BASE_URL + "getlist?token=" +token)
.then(response => setListData(response.data))
.catch(error => {
console.log(error);
});
}
return (<>
listdata.map(item => <Text>{item.digit}</Text>)
</>
);
}
You have to wait the fetch execution and later do the list map.
// wait for it
await axios
.get(constants.BASE_URL + "getlist?token=" +token)
.then(response => setListData(response.data))
.catch(error => {
console.log(error);
});
listdata.map(item => <Text>{item.digit}</Text>)
If you want to map the data then do that inside return statement of your code ,like:
return(
{listData?listdata.map(item => return <Text>{item.digit}</Text>):""}
);
This is a sample of a meant in my comment above:
Try console.log listdata at this stage, you will find that it is still
null, in other words, the value of the updated value of the
listdata:useSate will be ready after the render take place. You can
make another function outside of the current one. then use useEffect
with listdata to update your text views
const [listdata, setListData] = useState(null)
useEffect(() => makeRemoteRequest(), [listdata])
makeRemoteRequest = () => {
const url = `your-url-of-data-here`;
fetch(url)
.then(res => res.json())
.then(res => {
setListData(res.data);
})
.catch(error => {
console.log(error)
});
};
You could try the following:
const [listdata, setListData] = useState([])
useEffect(() => {
// Run! Like go get some data from an API.
getListData();
}, []);
const getListData = async () => {
const token = await AsyncStorage.getItem("#userToken")
try {
const dataResponse = await axios.get(constants.BASE_URL + "getlist?token=" +token);
setListData(dataResponse.data || [] );
} catch(error) {
console.log(error);
}
}
return (<>
listdata.map(item => <Text>{item.digit}</Text>)
</>);
Beginner with react and struggling with something that I am sure is probably very simple. I am just trying to make a simple component that will fetch data and display a part of it in a div. I am able to get the data and print it to console, but I am having trouble saving to a variable and displaying it. Here is my code (removed the actual url for privacy reasons):
let x = -1;
function getData(apiUrl){
fetch(apiUrl, {credentials: 'same-origin'})
.then((response) => {
if (!response.ok) {
Logging.error(`Did not get an ok. got: ${response.statusText}`);
}
return response.json();
})
.then(json => {x = json.value})
.catch((error) => {
Logging.error(`Error getting ad data: ${error.message}`);
})
}
const MyPage = () => {
getData('my endpoint')
return (
<div>{x}</div>
);
}
My issue is when I load the page it always displays my default value of "-1". So either x is never getting re-assigned, or the return is happening before it does.
Other commenters about setting state is not wrong.
However, you are also not exactly wrong, expecting a value for x.
Your getData function calls fetch, however you did not return anything from fetch. If you want to use x = getData(), you will need to ensure to add a return before the fetch function in order to return the data.
const getData = (apiUrl) => {
return fetch(apiUrl, {credentials: 'same-origin'})
.then((response) => {
if (!response.ok) {
Logging.error(`Did not get an ok. got: ${response.statusText}`);
}
return response.json();
})
.then(json => {x = json.value})
.catch((error) => {
Logging.error(`Error getting ad data: ${error.message}`);
})
}
let x = await getData(apiUrl)
However, fetch is asynchronous so it's you need to use x = await getData().
You cannot use await outside an async function, so you need to use effect, and useState to properly render the data you want.
import React, { useEffect, useState } from 'react';
const MyPage = () => {
const [ data, setData ] = useState();
useEffect(() => {
getData(apiUrl);
},[])
const getData = async (apiUrl) => {
fetch(apiUrl, {credentials: 'same-origin'})
.then((response) => {
if (!response.ok) {
Logging.error(`Did not get an ok. got: ${response.statusText}`);
}
return response.json();
})
.then(json => setData(json)) //setData here
.catch((error) => {
Logging.error(`Error getting ad data: ${error.message}`);
})
}
return (<pre>{ JSON.stringify(data, null, 4)}</pre>)
}
You need to use JSON.stringify to show your JSON results in your return statement.
You need to you use the state in react. Try something like:
import react, { useState, useEfect } from 'react';
const MyPage = () => {
const [data, setData] = useState(null);
const useEfect(() => {
const result = getData('my endpoint');
setData(result);
}, []);
return (
<div>{data}</div>
);
}