Develop Reference

how to fetch data according to slug in ReactJS?

I'm trying to fetch the particular blog according to the slug but I'm getting a axios error of 404 not found. i would really appreciate if any one can help..
import React, { useState, useEffect } from "react";
import { Link, useParams } from "react-router-dom";
import axios from "axios";
const data = "https://bulkaccounts.com/api/blogs";
function Singleblog() {
const { slug } = useParams();
const [blog, setBlog] = useState({});
const [isloading, setIsLoading] = useState(false);
const [error, setError] = useState(null);
const [items, setItems] = useState(null);
useEffect(() => {
const fetchBlogBySlug = async () => {
setIsLoading(true);
try {
const res = await axios.get(`http://localhost:3000/blog/${slug}`);
console.log({ res });
if (res?.data?.data) {
setBlog(res.data.data);
} else {
setError("Blog not found.");
}
} catch (error) {
console.log(error);
setError("Blog not found.");
}
setIsLoading(false);
};
fetchBlogBySlug();
}, [slug]);
let showData = "";
showData = (
<>
<div className="blog">
{data &&
data.datas.data.map((item) => {
return (
<>
<div className="flex-container">
<div className="card">hello</div>
</div>
</>
);
})}
</div>
</>
);
return (
<>
{showData}
<Link to="/">Home</Link>
</>
);
}
export default Singleblog;
// Api = https://bulkaccounts.com/api/blogs
i tried that code but it doesn't worked for me. help me figure out my mistake

First, check if http://localhost:3000/blog is a valid back-end server URL.
I think replacing http://localhost:3000/blog with https://bulkaccounts.com/api/blogs will solve the problem.

How to get item.docId so that i can get url for pdf in firestore

i'm trying to implement pdf viewer from url stored in firestore in react js
how i can get item.docId in setPdfUrls please help me out i'm new to react js and web development
Where I'm stuck is that I don't understand how to do it please help
How to get item.docId so that i can get url for pdf in firestore
`
import React, { useState, useEffect, useContext } from "react";
import { Card, Header, Player } from "../components";
import * as ROUTES from "../constants/routes";
import { FirebaseContext } from "../context/firebase";
import { ref, getDownloadURL } from "firebase/storage";
import { storage } from "../lib/firebase.prod";
import { SelectProfileContainer } from "./profiles";
import { FooterContainer } from "./footer";
export function BrowseContainer({ slides }) {
var [pdfUrls, setPdfUrls] = useState([]);
const [resume, setResume]=useState(null);
useEffect(()=>{
getDownloadURL(ref(storage, 'Resume.pdf')).then((url)=>{
setResume(url);
})
},[]);
const [category, setCategory] = useState("articles");
const [profile, setProfile] = useState({});
const [loading, setLoading] = useState(true);
const [slideRows, setSlideRows] = useState([]);
const { firebase } = useContext(FirebaseContext);
const user = firebase.auth().currentUser || {};
useEffect(() => {
setTimeout(() => {
setLoading(false);
}, 3000);
}, [profile.displayName]);
useEffect(() => {
setSlideRows(slides[category]);
}, [slides, category]);
return profile.displayName ? (
<>
<Card.Group>
{slideRows.map((slideItem) => (
<Card key={`${category}-${slideItem.title.toLowerCase()}`}>
<Card.Title>{slideItem.title}</Card.Title>
<Card.Entities>
{slideItem.data.map((item) => (
<Card.Item key={item.docId} item={item}>
<Card.Meta>
<Card.SubTitle>{item.title}</Card.SubTitle>
<br/>
<br/>
</Card.Meta>
<Card.Image
src={item.image} alt={item.title}/>
</Card.Item>
))}
</Card.Entities>
<Card.Feature category={category}>
<Player>
<Player.Button />
<Player.Video src={resume} />
</Player>
</Card.Feature>
</Card>
))}
</Card.Group>
<FooterContainer />
</>
) : (
<SelectProfileContainer user={user} setProfile={setProfile} />
);
}
`

React Native application freezes while fetching API

Hi I have very common problem, react native application freezes while fetching API,
It is like when you fetching you cannot click or do anythink till your fetching ends.
This is my code where I call function which fetchs APi
import React, { useEffect, useState } from "react";
import { StyleSheet, View, FlatList } from "react-native";
// Api`s
import { topCategory } from "../../api/appModels/category";
import { banners } from "../../api/appModels/slider";
import { dinamicBlocks } from "../../api/appModels/product";
// Hooks
import useApi from "../../Hooks/useApi";
// UI-Components
import Container from "../../uicomponents/General/Container";
import BannerSlider from "../../uicomponents/Slider/BannerSlider";
import Screen from "../../uicomponents/General/Screen";
import TopProductPattern from "../../uicomponents/Category/pattern/TopProductPattern";
import SliderPlaceholder from "../../uicomponents/Skeleton/Sliders/SliderPlaceholder";
import CategoryAvatarPlaceholder from "../../uicomponents/Skeleton/Category/CategoryAvatarPlaceholder";
import CategoryBlocks from "../../uicomponents/Product/blocks/CategoryBlocks";
import Header from "../../uicomponents/header/Header";
import ActivityIndicator from "../../uicomponents/Loaders/ActivityIndicator";
const HomeScreen = () => {
const {
data: topCategoryList,
loading: topCategoryLoading,
request: categoryRequest,
} = useApi(topCategory);
const {
data: bannersList,
loading: bannerLoading,
request: bannersRequest,
} = useApi(banners);
const {
loading: blocksLoading,
request: blocksRequest,
} = useApi(dinamicBlocks);
const [blocks, setBlocks] = useState([]);
const [indexing, setIndexing] = useState(1);
const [countBlocks, setCountBlocks] = useState(0);
const [loader, setLoader] = useState(false);
useEffect(() => {
// Calling Api`s
categoryRequest();
bannersRequest();
blocksRequest((item) => {
setIndexing(indexing + 1);
setBlocks(item["blocks"]);
setCountBlocks(item["count"]);
}, 1);
}, []);
const loadMore = () => {
if (!blocksLoading) {
blocksRequest((item) => {
setIndexing(indexing + 1);
setBlocks(blocks.concat(item["blocks"]));
console.log(item);
}, indexing);
setLoader(indexing != countBlocks);
}
};
return (
<Screen>
<FlatList
data={blocks}
keyExtractor={(item) => item.categories.toString()}
ListHeaderComponent={
<>
<Header />
{bannerLoading ? (
<SliderPlaceholder />
) : (
<BannerSlider data={bannersList} dots />
)}
<Container>
<View style={{ paddingTop: 10 }}>
{topCategoryLoading ? (
<CategoryAvatarPlaceholder />
) : (
<TopProductPattern data={topCategoryList} />
)}
</View>
</Container>
</>
}
ListFooterComponent={<ActivityIndicator visible={loader} />}
renderItem={({ item }) => (
<CategoryBlocks title={item.blocks_name} data={item.categoriesList} />
)}
onEndReached={loadMore}
onEndReachedThreshold={0.1}
/>
</Screen>
);
};
export default HomeScreen;
const styles = StyleSheet.create({});
Here is my code which fetches API
import { useState } from "react";
const useApi = (apiFunc) => {
const [data, setData] = useState([]);
const [error, setError] = useState("");
const [loading, setLoading] = useState(true);
const request = async (callBack = () => {}, ...args) => {
setLoading(true);
const response = await apiFunc(...args);
if (!response.ok) return setError(response.problem);
setLoading(false);
setError("");
setData(response.data);
if (response.ok) {
callBack(response.data);
}
};
return {
data,
error,
loading,
request,
setLoading,
setData,
};
};
export default useApi;
I think there is problem with RN-bridge HELP ME PLEASE !

Probably it's happened because you set onEndReachedThreshold={0.1} and when data was loaded one more time request will be send and it's make problem.
So you can increase this value for example to 0.7.
In the official react native website This is how it is explained onEndReachedThreshold:
"How far from the end (in units of visible length of the list) the bottom edge of the list must be from the end of the content to trigger the onEndReached callback. Thus a value of 0.5 will trigger onEndReached when the end of the content is within half the visible length of the list."

Rendering info from the Reddit API using React

I am trying to build a basic web app where a user can search for subreddits using the Reddit API.
However, while I can console.log the data I need from the API I cannot seem to figure out how to display it.
import React, { useState, useEffect } from "react";
import Amplify, { API, graphqlOperation } from "aws-amplify";
import aws_exports from "./aws-exports";
import { withAuthenticator, AmplifySignOut } from '#aws-amplify/ui-react';
import awsconfig from "./aws-exports";
import './App.css'
import axios from 'axios'
import CharacterGrid from './components/CharacterGrid'
import SearchBar from './components/SearchBar'
Amplify.configure(awsconfig);
const App = () => {
const [items, setItems] = useState([])
const [isLoading, setIsLoading] = useState(true)
const [query, setQuery] = useState('')
useEffect(() => {
const fetchItems = async () => {
setIsLoading(true)
const result = await axios(
`https://www.reddit.com/subreddits/search.json?q=${query}`
)
setItems(result.data)
setIsLoading(false)
}
fetchItems()
}, [query])
return (
<div className='container'>
<AmplifySignOut/>
<SearchBar style={{ marginTop: "6%" }} getQuery={(q) => setQuery(q)} />
<CharacterGrid isLoading={isLoading} items={items} />
</div>
)
}
export default withAuthenticator(App)
The child component CharacterGrid looks like this:
import React from 'react'
import CharacterItem from './CharacterItem'
const CharacterGrid = ({items, isLoading}) => {
return
isLoading
? (<h1>Loading ...</h1>)
: (
<section className='cards'>
<p>{items.data}</p> //this does not work
<p>{items.children}</p> //this does not work either
</section>
)
}
export default CharacterGrid
All I want to do is show the names of the subreddits that are returned from the API for the query string the user enters. Where am I going wrong? I have also tried converting to JSON, and mapping through the responses using .map() but I keep getting errors no matter what I try. Where am I going wrong?

However, while I can console.log the data I need from the API I cannot seem to figure out how to display it.
Because Reddit API returns an array of subreddits you should use map() function to iterate over the array and convert each item into React element.
items.map(i => (
<li key={i.data.display_name_prefixed}>
{i.data.display_name}
</li>
))
All I want to do is show the names of the subreddits that are returned from the API for the query string the user enters.
You need to inspect the data schema yourself and scrape the response properly.
Here is working example:
const { useState, useEffect } = React;
const App = () => {
const [items, setItems] = useState([]);
const [isLoading, setIsLoading] = useState(true);
const [query, setQuery] = useState("");
useEffect(() => {
setIsLoading(true);
if (query.length >= 3) {
axios(`https://www.reddit.com/subreddits/search.json?q=${query}`)
.then(response => setItems(response.data.data.children))
.catch(error => console.log("Error", error));
}
setIsLoading(false);
}, [query]);
return (
<div>
<input type="text" value={query} onChange={e => setQuery(e.target.value)} />
<CharacterGrid items={items} isLoading={isLoading} />
</div>
);
}
const CharacterGrid = ({ items, isLoading }) => {
return isLoading ? (
<h1>Loading ...</h1>
) : (
<ul>
{items.map(i => (
<li key={i.data.display_name_prefixed}>
{i.data.display_name} ({i.data.display_name_prefixed})
</li>
))}
</ul>
);
};
ReactDOM.render(<App />, document.getElementById('root'));
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/16.8.4/umd/react.production.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.8.4/umd/react-dom.production.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/axios/0.19.2/axios.min.js"></script>
<div id="root"></div>

In order to loop through the elements and e.g: print the title, you could do the following.
items.data.children.map(child => <p> child.data.title </p>)
According to the response provided by reddit,
reddit response

How to properly use the UseCallback Hook

The following code gives me a warning that
React Hook useEffect has a missing dependency: 'getData'.
Either include it or remove the dependency array
I know in the new rules of react I must wrap it in a useCallBack but I am unsure how to do so. Can someone please provide me with how to use, useCallBack properly. Thank you in advance!!
import React, { useState, useEffect, useCallback } from "react"
import axios from "axios"
const Home = () => {
const [data, setData] = useState(null)
const [query, setQuery] = useState("reacthooks")
useEffect(() => {
getData()
}, [query])
const getData = async () => {
const response = await axios.get(
`http://hn.algolia.com/api/v1/search?query=${query}`
)
setData(response.data)
}
const handleChange = event => {
event.preventDefault()
setQuery(event.target.value)
}
return (
<div>
<input type='text' onChange={handleChange} />
{data &&
data.hits.map(item => (
<div key={item.objectID}>
{item.url && (
<>
<a href={item.url}>{item.title}</a>
<div>{item.author}</div>
</>
)}
</div>
))}
</div>
)
}
export default Home

I would simply add the getData function into useEffect hook in your case instead.
Try the following:
useEffect(() => {
const getData = async () => {
const response = await axios.get(
`http://hn.algolia.com/api/v1/search?query=${query}`
)
setData(response.data)
}
getData()
}, [query])
I hope this helps!