So i've basically got 2 components on my page.
First is the search component where the users need to type their username and second one where their stats get displayed
and here is my API request call in App.js
useEffect(()=>{
const fetchStats = async ()=> {
const result = await axios.get(`https://cors-anywhere.herokuapp.com/https://public-api.tracker.gg/v2/csgo/standard/profile/steam/${username}`,
{
headers: {
'TRN-Api-Key' : '***************************',
}
}
)
if(username !== null){
console.log(result.data)
setStats(result.data)
}
}
fetchStats()
},[username])
and this is the search component
const Search = ({setInputText, setUsername, inputText, username}) => {
const inputHandler = (e)=> {
setInputText(e.target.value)
}
const searchHandler = (e)=> {
e.preventDefault()
setUsername(inputText)
}
return (
<div>
<form>
<input value={inputText} onChange={inputHandler} type="text"/>
<button onClick={searchHandler}>Search</button>
</form>
</div>
)
}
What i'm having an issue with is when i click a button in the username component the value(username) from the form gets stored in the 'username' state in App.js. Now i'm using this code in the stats component.
const Stats = ({stats}) => {
return (
<div>
<h1>{stats.data.platformInfo.platformUserHandle}</h1>
</div>
)
}
export default Stats
Here stats.data.platformInfo.platformUserHandle doesn't exist when the app starts so it gives me a LOT of errors. How do i keep the app from crashing till the user has input something and data can be sent to the stats component?
Related
On my ecommerce project I wanna impelement a search bar where you can search products by name through drf api, I installed django_filters and created a class like so:
class ProductFilter(generics.ListCreateAPIView):
queryset = Product.objects.all()
serializer_class = ProductSerializer
filter_backends = [filters.SearchFilter]
search_fields = ['^name']
I tested the endpoint and it works but I don't know how to make it work on the frontend part with react, I have the saerchbar in the header like so:
<Form className="d-flex">
<Form.Control
type="search"
placeholder="Search"
className="me-2"
aria-label="Search"
/>
<Button variant="outline-success">Search</Button>
</Form>
Using axios for api calls, I have no idea how to set this up and if I need reducers, actions, store too
I think you can create a function which will make an api call when user enters any text in the input. Also, debounce it to avoid frequent api calls.
import React, { useCallback } from "react";
// Debounce to avoid frequent api calls
export const debounce = (func, waitFor) => {
let timeout = null;
const debounced = (...args) => {
if (timeout !== null) {
clearTimeout(timeout);
timeout = null;
}
timeout = setTimeout(() => func(...args), waitFor);
};
return debounced;
};
const TestComponent = () => {
// debounce the function so that we send api calls once user stops typing
const searchSomething = useCallback(
debounce(async (value) => {
try {
// Make your api call using whichever library you are using
// let response = await fetch(`${YOUR_SERVER_URL}/search?query=${value}`);
let response = axios.get(`${YOUR_SERVER_URL}/search?query=${value}`)
console.log(response);
} catch (error) {
console.log(error);
}
}, 500),
[]
);
return (
<Form className="d-flex">
<Form.Control
type="search"
placeholder="Search"
className="me-2"
aria-label="Search"
onChange={(e) => {
searchSomething(e.target.value);
}}
/>
<Button variant="outline-success">Search</Button>
</Form>
);
};
export default TestComponent;
Your axios call should end up something like this:
axios({
method: 'post',
url: '/login', // replace with your endpoint URL
data: {
searchField.name: searchField.value,
}
});
with searchField.name being whatever field name Django is expecting to receive on the back end (it looks like it's name here), and searchField.value being the value of the search field.
I made a search bar that allows the user to search all sports available in one specific city (if sport is not defined) or a specific sport in a specific city (if sport is defined).
City will allways be defined.
I put 2 inputs (city and sport) on my searchbar and I want immediate results (so that there is a request to my API without any button "search" that triggers the request).
So when the user types something on the city input it triggers a request to the API and when he types something on the sport input it retriggers the request but this time with the city and the sport defined.
Both inputs values are store in states (city and sport).
I manage to do something that seems to work, the only problem is that if I types a sport in my input search, it does not update my request to the API. I have to retype the sport in my input a second time so that the request is updated.
I don't know why it does not update the first time I types something in my sport input because I have specified on my useEffect array that it must re render when the sport state changes.
Can someone help me understand this ?
My code :
import React, { useState, useEffect } from "react";
import style from "../styles/pdrs.module.css";
import axios from "axios";
import SearchBar from "../components/SearchBar";
const Pdrs = ({ setSearchCity, searchSport, setSearchSport }) => {
// if request's result is loading
const [isLoading, setIsLoading] = useState(false);
// search result
const [searchresults, setSearchresults] = useState(
"Lancez une recherche avec au moins une ville !"
);
// state for the searchbar request
const [city, setCity] = useState("");
const [sport, setSport] = useState(0);
// get city's id for API's request
const fetchCity = async () => {
setIsLoading(true);
try {
// city search
const cityResponse = await axios.get(
`${baseAPI}/city/name=${searchCity}`
);
const city = cityResponse.data;
setCity(city);
setIsLoading(false);
} catch (error) {
console.log(error.message);
setIsLoading(false);
}
};
//fetching sport id
const fetchSport = async () => {
setIsLoading(true);
try {
const sportResponse = await axios.get(
`${baseAPI}/activity/name=${searchSport}`
);
setSport(sportResponse.data.data[0].macro_activity_id);
setIsLoading(false);
} catch (error) {
console.log(error.message);
}
};
//fetching final request response
const fetchDataRequest = async () => {
try {
setIsLoading(true);
const results = await axios.get(
`${baseAPI}/pdrs?city_id=${city.id}${
sport ? "¯o_activity_id=" + sport : ""
}`
);
// manage search results
if (results.data.nb_results === 1) {
setSearchresults({
data: [results.data.data],
nb_results: 1,
});
setNbResults(1);
setIsLoading(false);
} else {
setSearchresults(results.data);
setNbResults(results.data.nb_results);
setIsLoading(false);
}
} catch (error) {
console.log(error.message);
setSearchresults(
"Sorry, nothing was found... !"
);
}
};
useEffect(() => {
if (searchCity) {
fetchCity();
}
if (searchSport) {
fetchSport();
}
}, [searchCity, searchSport]);
useEffect(() => {
if (searchCity) {
fetchDataRequest();
}
}, [searchCity, searchSport]);
console.log(searchresults);
return <>
<main className={`container ${style.pdrs}`}>
<section className={style.searchbar}>
<SearchBar
searchCity={searchCity}
setSearchCity={setSearchCity}
searchSport={searchSport}
setSearchSport={setSearchSport}
searchInstallation={searchInstallation}
setSearchInstallation={setSearchInstallation}
searchType={searchType}
setSearchType={setSearchType}
setPage={setPage}
/>
</section>
<section className={style.results}>
{isLoading ? (
<div>Loading...</div>
) : typeof searchresults === "string" ? (
<div className={`${style.container} ${style.noResults}`}>
<h2>{searchresults}</h2>
</div>
) : (
<>
<div className={style.container}>
<div className={style.resultsList}>
{searchresults.data.map((pdrs) => {
return (
// some code displaying the result
);
})}
</div>
</div>
</>
)}
</section>
</main>
</>;
};
export default Pdrs;
Since you are having two useEffect and one is setting city and sport you would need to make debounce for making a call for fetching list by itself.
I would suggest that you firstly make changes to your use effect for API call fetchDataRequest:
useEffect(() => {
if (searchCity) {
fetchDataRequest();
}
}, [city, sport]);
You would listen to the actual data from BE, not from input that you fill.
And secondly you can use library useDebounce from here https://www.npmjs.com/package/use-debounce and use useDebounceCallback to delay calling API call after you select sport/city.
In my app I have profile section with a form. When the component mounts I want to fetch user data from firebase, and display it in the form, with the current values of the user profile. Either using the "value" prop or the "placeholder" prop.
When the user makes changes in the form inputs and submit the changes, I want the database to update and the form to update with the new data.
Currently I can make the database value appear in the form input field, or I can make the form input field empty, but update the database. But not both.
The following code makes the database data render in the form input, but it cant be changed.
I know it could be something with the second useEffect() and the getUserData() function, that I cant seem to figure out.
const UserEdit = (props) => {
const [currentUser, setCurrentUser] = useState('');
const [forening, setForening] = useState('');
useEffect(() => {
firebase_app.auth().onAuthStateChanged(setCurrentUser);
}, [])
const getUserData = async () => {
await dbRef.ref('/' + currentUser.uid + '/profil/' ).once('value', snapshot => {
const value = snapshot.val();
setForening(value)
})
}
useEffect(() => {
getUserData()
},[] )
const handleInput = (event) => {
setForening(event.target.value)
}
const updateUserData = () => {
dbRef.ref('/' + currentUser.uid + '/profil/' ).set({foreningsnavn: forening}, function(error) {
if(error) {
console.log("update failed")
} else {
alert(forening)
}
})
}
const handleClick = () => {
updateUserData()
}
return (
<>
<div className="card-body">
<div className="row">
<div className="col-md-5">
<div className="form-group">
<label className="form-label">{Forening}</label>
<input className="form-control" type="text" value={forening} onChange={handleInput}/>
</div>
</div>
</div>
</div>
</>
)
}
Your second useEffect will run only one time because the second argument array [] of dependencies is empty:
useEffect(() => {
getUserData()
},[] )
You can add foreign dependency to make useEffect run with input change
useEffect(() => {
getUserData()
},[foreign] )
or you can use polling to sync database state
I am using Agora for the first time and am facing an issue while adding remote streams. When 1st user joins a channel it correctly show it's stream but when another user joins the same channel, the stream of the second user appears on the first user's screen but the stream of first user does not appear on the second user stream. i.e. a user is only able to see the streams of the people joined after it and not of those that joined before it. Below is the code.
import React, { useEffect, useState, useRef } from "react";
import ReactDOM from "react-dom";
import "./App.css";
import { options, rtc } from "./constants";
import AgoraRTC from "agora-rtc-sdk-ng";
function App() {
const RemoteUser = [];
async function handleSubmit(e) {
try {
if (channelRef.current.value === "") {
return console.log("Please Enter Channel Name");
}
setJoined(true);
rtc.client = AgoraRTC.createClient({ mode: "rtc", codec: "h264" });
const uid = await rtc.client.join(
options.appId,
channelRef.current.value,
options.token,
null
);
// Create an audio track from the audio captured by a microphone
rtc.localAudioTrack = await AgoraRTC.createMicrophoneAudioTrack();
// Create a video track from the video captured by a camera
rtc.localVideoTrack = await AgoraRTC.createCameraVideoTrack();
rtc.localVideoTrack.play("local-stream");
rtc.client.on("user-published", async (user, mediaType) => {
// Subscribe to a remote user
await rtc.client.subscribe(user);
console.log("subscribe success");
// console.log(user);
if (mediaType === "video" || mediaType === "all") {
// Get `RemoteVideoTrack` in the `user` object.
const remoteVideoTrack = user.videoTrack;
console.log(remoteVideoTrack);
// Dynamically create a container in the form of a DIV element for playing the remote video track.
const PlayerContainer = React.createElement("div", {
id: user.uid,
className: "stream",
});
ReactDOM.render(
PlayerContainer,
document.getElementById("remote-stream")
);
user.videoTrack.play(`${user.uid}`);
}
if (mediaType === "audio" || mediaType === "all") {
// Get `RemoteAudioTrack` in the `user` object.
const remoteAudioTrack = user.audioTrack;
// Play the audio track. Do not need to pass any DOM element
remoteAudioTrack.play();
}
});
rtc.client.on("user-unpublished", (user) => {
// Get the dynamically created DIV container
const playerContainer = document.getElementById(user.uid);
console.log(playerContainer);
// Destroy the container
playerContainer.remove();
});
// Publish the local audio and video tracks to the channel
await rtc.client.publish([rtc.localAudioTrack, rtc.localVideoTrack]);
console.log("publish success!");
} catch (error) {
console.error(error);
}
}
async function handleLeave() {
try {
const localContainer = document.getElementById("local-stream");
rtc.localAudioTrack.close();
rtc.localVideoTrack.close();
setJoined(false);
localContainer.textContent = "";
// Traverse all remote users
rtc.client.remoteUsers.forEach((user) => {
// Destroy the dynamically created DIV container
const playerContainer = document.getElementById(user.uid);
playerContainer && playerContainer.remove();
});
// Leave the channel
await rtc.client.leave();
} catch (err) {
console.error(err);
}
}
const [joined, setJoined] = useState(false);
const channelRef = useRef("");
const remoteRef = useRef("");
const leaveRef = useRef("");
return (
<>
<div className="container">
<input
type="text"
ref={channelRef}
id="channel"
placeholder="Enter Channel name"
/>
<input
type="submit"
value="Join"
onClick={handleSubmit}
disabled={joined ? true : false}
/>
<input
type="button"
ref={leaveRef}
value="Leave"
onClick={handleLeave}
disabled={joined ? false : true}
/>
</div>
{joined ? (
<>
<div id="local-stream" className="stream local-stream"></div>
<div
id="remote-stream"
ref={remoteRef}
className="stream remote-stream"
></div>
</>
) : null}
</>
);
}
export default App;
create rtcClient outside the function handleSubmit.
Also register the events when document/Page is ready.
rtc.client = AgoraRTC.createClient({ mode: "rtc", codec: "h264" });
rtc.client.on("user-published", async (user, mediaType) => {
//Your code
}
rtc.client.on("user-unpublished", (user) => {
//Your code
}
It will show the users list accurately.
I try to implement the Search function into my management system using React-Hooks and GraphQL-Apollo Client. While the interface is shown successfully, when I press the 'Search' button it came out an error which named:
Invalid hook call. Hooks can only be called inside of the body of a function component.
I'm pretty sure the useQuery is being called inside a function, so I do not understand what will cause this. The other function such as display all users and add new users are working fine.
I have tried a couple of ways to implement the search function and search around online while still couldn't get it solve. This is my first time encounters React-Hooks too.
Here is my current code in the searchUser component
import React from 'react'
import {useQuery} from 'react-apollo-hooks';
import {searchUserQ} from '../queries/queries';
const SearchUserForm = () => {
let name = '';
let content;
return (
<div id="edit-user">
<div className="field">
<label htmlFor="name">Search UserName</label>
<input type="text" id="name" onChange={ (event) => {
name = event.target.value }}/>
<button onClick={(event) => {
event.preventDefault();
const { data, loading, error } = useQuery(searchUserQ, {
variables: { name: name },
suspend: false
});
if (loading) {
content = <p>Loading User...</p>
}
if (error){
console.log(`Error Occur: ${ error }`);
content = <p>Error Occur!</p>
}
content = data.users.map(user => (
<p key={user.id}>Username: {user.name} ID: {user.id}</p>
));
}}>
Submit
</button>
<p>{ content }</p>
</div>
</div>
)
}
export default SearchUserForm;
Can anyone help with this?
One more question is that my data seems to return undefined everytime I execute the query. Is there something wrong with my query?
Here are the query:
const searchUserQ = gql`
query User($name: String!){
user(name: $name){
id
name
email
}
}
`;
Thanks and appreciate on the help!
According to the Rules of Hooks:
Don’t call Hooks from regular JavaScript functions. Instead, you can:
✅ Call Hooks from React function components.
✅ Call Hooks from custom Hooks (we’ll learn about them on the next page).
If you need to manually call a query manually ins response to an event, use the Apollo client directly. You can use useApolloClient to get an instance of the client inside your component:
const SearchUserForm = () => {
const client = useApolloClient();
...
return (
...
<button onClick={async (event) => {
try {
const { data } = client.query({
query: searchUserQ,
variables: { name: event.target.value },
});
// Do something with data, like set state
catch (e) {
// Handle errors
}
}} />
You can also still use useQuery, like this:
const SearchUserForm = () => {
const [name, setName] = useState('')
const { data, loading, error } = useQuery(searchUserQ, {
variables: { name },
});
...
return (
...
<button onClick={async (event) => {
setName(event.target.value)
...
}} />
You can use the useLazyQuery method and expose your data object to your entire component.
import {useLazyQuery} from '#apollo/react-hooks';
// - etc. -
const SearchUserForm = () => {
// note: keep the query hook on the top level in the component
const [runQuery, { data, loading, error }] = useLazyQuery(searchUserQ);
// you can now just use the data as you would regularly do:
if (data) {
console.log(data);
}
return (
<div id="edit-user">
<div className="field">
<label htmlFor="name">Search UserName</label>
<input
type="text"
id="name"
onChange={(event) => {name = event.target.value }} />
<button onClick={
(event) => {
event.preventDefault();
// query is executed here
runQuery({
variables: { name }, // note: name = property shorthand
suspend: false
})
}}>
// - etc. -
);
}
As opposed to doing the useQuery, the useLazyQuery method will only be executed on the click.
At the point where you are able to pass the 'name' value as a parameter.
If for example you would use the useQuery instead, and have a parameter that is required in your query (i.e. String!), the useQuery method will provide you with an error. Because on component render it will try to run that query directly without the required parameter because at that period of time it's not available yet.
I found problem to my second answer, should just wrap an if-statement before executing it, here is the complete code:
import React, {useState} from 'react'
import {useQuery} from 'react-apollo-hooks';
import {searchUserQ} from '../queries/queries';
const SearchUserForm = () => {
const [name, setName] = useState('');
const { data, error, loading } = useQuery(searchUserQ, {
variables: { name }
});
let content;
let sName;
if (data.user !== undefined && data.user !== null) {
if (loading) { content = 'Loading User...' }
if (error) { content = `Error Occur: ${error}` }
const user = data.user;
content = `Username: ${ user.name } ID: ${ user.id }`
}
return (
<div id="edit-user">
<div className="field">
<label htmlFor="name">Search UserName</label>
<input type="text" id="name" onChange={(event) => {
sName = event.target.value;
}}/>
<button onClick={(event) => {
setName(sName);
}} value={name}>
Search
</button>
</div>
<div>
<p>{ content }</p>
</div>
</div>
)
};
export default SearchUserForm;