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 pass data from child to parent and render content based on selected value in dropdown?

I am learning React as I am fetching data from Pokéapi to make a list component, card component, detail component and filter component. I am trying to make a filter so you can filter by pokémon type. Only the cards that also contain that type string should then render (Not there yet). So I am not sure if a) I should make a different call from API inside PokemonList depending on selected value or b) if I should compare the values and just change how the PokemonCard element is rendered inside PokemonList.js depending on the comparison. I managed to pass data from filter to the list component. I have then been trying to pass the type data from PokemonCard.js to the list component so that I can compare these two values but I find it hard to use callbacks to pass the type data from the card component, since I dont pass it through an event or something like that.
Which method should I use here to simplify the filtering? Make different API call or render PokemonCard element conditionally?
Is it a good idea to compare filter option to pokemon card's type in PokemonList.js? Then how can I pass that data from the card component since I don't pass it through click event?
Thankful for any ideas! I paste the code from list component that contains the cards, card component and filter component.
PokemonList component:
import { useState } from 'react';
import useSWR from 'swr';
import PokemonCard from './PokemonCard';
import PokemonFilter from './PokemonFilter';
import './PokemonList.css';
const PokemonList = () => {
const [index, setIndex] = useState(0);
const [type, setType] = useState('');
function selectedType(type) { // value from filter dropdown
setType(type)
console.log("handled")
console.log(type)
}
const url = `https://pokeapi.co/api/v2/pokemon?limit=9&offset=${index}`;
const fetcher = (...args) => fetch(...args).then((res) => res.json())
const { data: result, error } = useSWR(url, fetcher);
if (error) return <div>failed to load</div>
if (!result) return <div>loading...</div>
result.results.sort((a, b) => a.name < b.name ? -1 : 1);
return (
<section>
<PokemonFilter onSelectedType={selectedType} selectedPokemonType={type} />
<div className="pokemon-list">
<div className="pokemons">
{result.results.map((pokemon) => (
<PokemonCard key={pokemon.name} pokemon={pokemon} /> // callback needed??
))}
</div>
<div className="pagination">
<button
onClick={() => setIndex(index - 9)}
disabled={result.previous === null}
>
Previous
</button>
<button
onClick={() => setIndex(index + 9)}
disabled={result.next === null}
>
Next
</button>
</div>
</div>
</section>
)
}
export default PokemonList;
PokemonCard component:
import { Link } from "react-router-dom";
import useSWR from 'swr';
import './PokemonCard.css';
const PokemonCard = ({ pokemon }) => {
const { name } = pokemon;
const url = `https://pokeapi.co/api/v2/pokemon/${name}`;
const { data, error } = useSWR(url);
if (error) return <div>failed to load</div>
if (!data) return <div>loading...</div>
const { types, abilities } = data;
// types[0].type.name <---- value I want to pass to PokemonList.js
return (
<div className='pokemon-card'>
<div className='pokemon-card__content'>
<img
className='pokemon-card__image'
src={data.sprites.front_default}
alt={name}
/>
<div className='pokemon-card__info'>
<p className='pokemon-card__name'>Name: {name}</p>
<p className='pokemon-card__abilities'>Abilities: {abilities[0].ability.name}</p>
<p className='pokemon-card__categories'>Category: {types[0].type.name}</p>
</div>
</div>
<Link className='pokemon-card__link' to={{
pathname: `/${name}`,
state: data
}}>
View Details
</Link>
</div>
)
}
export default PokemonCard;
PokemonFilter component:
import './PokemonFilter.css';
import useSWR from 'swr';
const PokemonFilter = ({onSelectedType, selectedPokemonType}) => {
const url = `https://pokeapi.co/api/v2/type/`;
const fetcher = (...args) => fetch(...args).then((res) => res.json())
const { data: result, error } = useSWR(url, fetcher);
if (error) return <div>failed to load</div>
if (!result) return <div>loading...</div>
function filteredTypeHandler(e) {
console.log(e.target.value);
onSelectedType(e.target.value);
}
console.log(selectedPokemonType)
return(
<div className="pokemon-types__sidebar">
<h2>Filter Pokémon by type</h2>
<select
name="pokemon-type"
className="pokemon-types__filter"
onChange={filteredTypeHandler}
>
<option value="All">Filter By Type</option>
{result.results.map((type) => {
return (
<option key={type.name} value={type.name}> {type.name}</option>
)
})}
</select>
</div>
)
}
export default PokemonFilter;

Here is an example to improve, modify, ... I didn't test, it's just a visual example.
I don't know about useSWR sorry, I use axios in my example...
If you want to centralize all your API requests, you can create a useApi hook, on the internet you will find tutorials.
PokemonList.js
import React, { useState, useEffect } from 'react';
import axios from 'axios'; // or swr
import PokemonFilter from './PokemonFilter';
import PokemonCard from './PokemonCard';
export default function PokemonList() {
const [data, setData] = useState([]);
const [filter, setFilter] = useState('');
// Executed every first render
useEffect(() => {
getData();
}, []);
// Executed only when filter changes
useEffect(() => {
getDataByTypes(filter);
}, [filter]);
// Get data
const getData = async () => {
const uri = 'https://xxx';
try {
const response = await axios.get(uri);
setData(response.data...);
} catch (error) {
console.log(error);
}
};
// Get data by types
const getDataByTypes = async (filter) => {
const uri = `https://xxx/type/${filter}...`;
if (filter) {
try {
const response = await axios.get(uri);
setData(response.data...);
} catch (error) {
console.log(error);
}
}
};
return (
<div className="main">
<PokemonFilter filter={filter} setFilter={setFilter} />
<div className="container">
<div className="cards-container">
{data.map((d) => (
<PokemonCard key={d.name} data={d} />
))}
</div>
</div>
</div>
);
}
PokemonCard.js
import React, { useState, useEffect } from 'react';
import axios from 'axios';
export default function PokemonCard({ data }) {
const [pokemons, setPokemons] = useState();
useEffect(() => {
getPokemons(data);
}, [data]);
// Get Pokemons
const getPokemons = async (data) => {
const uri = `https://xxx/pokemon/${data.name}/`;
try {
const response = await axios.get(uri);
setPokemons(response.data...);
} catch (error) {
console.log(error);
}
};
return (
<div>
{pokemons && (
<div className="card">
<img src={pokemons.sprites.front_default} alt={pokemons.name} />
<p>{pokemons.name}</p>
<p>{pokemons.abilities[0].ability.name}</p>
<p>{pokemons.types[0].type.name}</p>
</div>
)}
</div>
);
}
PokemonFilter.js
import React, { useState, useEffect } from 'react';
import axios from 'axios';
export default function PokemonFilter({ filter, setFilter }) {
const [types, setTypes] = useState([]);
useEffect(() => {
getType();
}, []);
// Get Type
const getType = async () => {
const uri = 'https://xxx/type/';
try {
const response = await axios.get(uri);
setTypes(response.data.results....);
} catch (error) {
console.log(error);
}
};
const handleFilter = (e) => {
setFilter(e.target.value);
};
return (
<select onChange={handleFilter} value={filter}>
<option>Filter by type</option>
{types.map((type) => {
return (
<option key={type.name} value={type.name}>
{type.name}
</option>
);
})}
</select>
);
}

Search box with React-Query

I am trying to implement Product search by text. Fetching data with react-query. The following implementation is working but it does not feel right to me. Let me know if I am overdoing it and if there is a simpler solution with react-query.
import { useEffect, useState } from 'react';
import { useSelector } from 'react-redux';
import { useQueryClient } from 'react-query';
import ProductCard from '#/components/cards/ProductCard';
import { useQueryProducts } from '#/hooks/query/product';
import { selectSearch } from '#/store/search';
// function fetchProductsByFilter(text){}
const Shop = ({ count }) => {
const [products, setProducts] = useState([]);
const [loading, setLoading] = useState(true);
const { text } = useSelector(selectSearch);
const productsQuery = useQueryProducts(count);
useEffect(() => {
setProducts(productsQuery.data);
setLoading(false);
}, []);
const queryClient = useQueryClient();
useEffect(() => {
const delayed = setTimeout(() => {
queryClient.prefetchQuery(['searchProductsByText'], async () => {
if (text) {
const data = await fetchProductsByFilter(text);
setProducts(data);
setLoading(false);
return data;
}
});
}, 300);
return () => clearTimeout(delayed);
}, [text]);
return (
<div className="container-fluid">
<div className="row">
<div className="col-md-3">search/filter menu</div>
<div className="col-md-9">
{loading ? (
<h4 className="text-danger">Loading...</h4>
) : (
<h4 className="text-danger">Products</h4>
)}
{products.length < 1 && <p>No products found</p>}
<div className="row pb-5">
{products.map((item) => (
<div key={item._id} className="col-md-4 mt-3">
<ProductCard product={item} />
</div>
))}
</div>
</div>
</div>
</div>
);
};
// async function getServerSideProps(context) {}
export default Shop;

It doesn't seem very idiomatic to me. With react-query, the key to using filters are to put them into the query key. Since react-query refetches every time the key changes, you'll get a refetch every time you change a filter, which is usually what you want. It's a very declarative way of doing things. No useEffect needed at all.
If this happens when choosing something from a select or clicking an apply button, that's really all you need:
const [filter, setFilter] = React.useState(undefined)
const { data, isLoading } = useQuery(
['products', filter],
() => fetchProducts(filter)
{ enabled: Boolean(filter) }
)
Here, I am additionally disabling the query as long as the filter is undefined - fetching will start as soon as we call setFilter.
if typing into a text field is involved, I'd recommend some debouncing to avoid firing off too many requests. The useDebounce hook is very good for that. You'd still have the useState, but you'd use the debounced value for the query:
const [filter, setFilter] = React.useState(undefined)
const debouncedFilter = useDebounce(filter, 500);
const { data, isLoading } = useQuery(
['products', debouncedFilter],
() => fetchProducts(debouncedFilter)
{ enabled: Boolean(debouncedFilter) }
)

If this happens when choosing something from a select or clicking an apply button, that's really all you need:
const [filter, setFilter] = useState<string>('')
const isEnabled = Boolean(filter)
const { data, isLoading } = useQuery(
['products', filter],
() => fetchProducts(filter)
{ enabled: enabled: filter ? isEnabled : !isEnabled, }
)
<input type="text" onChange={(e) => setFilter(e.target.value)}/>

Trouble displaying the data from an api

So, this a weird problem. Yesterday everything was working fine, I could see the category object displayed, I could switch between categories, but today I wanted to continue the project, but the data is not being displayed, I can not even see the object in the console. What could be the problem, is it in the Fetch I would really really appreciate the help
import React, {useState, useEffect} from 'react'
import URL from '../utilis/URL'
const BookContext = React.createContext();
export default function BooksProvider({ children }) {
const [data, setData] = useState([])
const [currentSelectedCategory, setCurrentSelectedCategory] = useState([]);
const handleSelectCategory = (category) => {
setCurrentSelectedCategory(data[category]);
};
const fetchData = async () => {
const response = await fetch(URL);
const result = await response.json();
console.log(data.result)
setCurrentSelectedCategory(result[Object.keys(result)[0]]);
setData(data);
};
useEffect(()=>{
fetchData();
},[])
return (
<BookContext.Provider value={{ data, handleSelectCategory, setCurrentSelectedCategory, currentSelectedCategory }}>
{children}
</BookContext.Provider>
);
}
export {BookContext, BooksProvider}
import React,{useState, useEffect} from 'react'
import './Home.css'
import Books from './Books'
import { BookContext } from "../../context/books";
const Home = () => {
const {data, handleSelectCategory, currentSelectedCategory } =React.useContext(BookContext)
return (
<div className='books__container' >
<h1 className='categories'>Categories</h1>
{Object.keys(data).map((key, index)=>{
let books = data[key];
return (
<>
<span key={key} onClick={() => handleSelectCategory(key)} className='books__list' >
{books[0].category}
</span>
</>
);})}
<Books category={currentSelectedCategory} />
</div>
)
}
export default Home

This doesn't do anything:
console.log(data.result)
Because data is an empty array (and arrays have no result property anyway):
const [data, setData] = useState([])
And this doesn't do anything:
setData(data);
Because you're just updating the state to itself, which changes nothing and probably doesn't trigger any re-render. (Though even if it does, the render is mapping the elements of data which is still an empty array.)
You probably meant to set the data state object to the result from the API?:
setData(result);

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