Building a Country Finder Application with React-CSS Tutorial-php.cn

Building a Country Finder Application with React

Introduction

In this blog post, we'll explore how to build a Country Finder application using React. This application allows users to search for countries, filter them by region, and view detailed information about each country. We will utilize React's hooks and context to manage state and theming, and we'll integrate with the REST Countries API to fetch country data.

Project Overview

The Country Finder application provides an interactive interface where users can:

Search for countries by name.
Filter countries by region.
View detailed information about each country, including its flag, population, and more.

Features

Search Bar: Allows users to search for countries by name.
Filter by Region: Dropdown menu to filter countries based on their region.
Country Details: Displays detailed information about a selected country.
Theme Toggle: Switch between light and dark themes.

Technologies Used

React: JavaScript library for building user interfaces.
REST Countries API: Provides data about countries.
CSS: For styling the application.
React Router: For navigating between pages and passing state.

Project Structure

The project is organized into several components:

App.js: Main component that includes the Header and Outlet for routing.
Header.js: Displays the application title and theme toggle button.
Home.js: Main page with search and filter options, and a list of countries.
SearchBar.js: Component for searching countries.
SelectMenu.js: Dropdown menu for filtering countries by region.
CountriesList.js: Displays a list of countries based on the search and filter criteria.
CountryCard.js: Displays a summary of each country.
CountryDetail.js: Shows detailed information about a selected country.
CountryDetailShimmer.js: Loading placeholder for country details.
Error.js: Error handling component for routes.

Installation

Clone the repository:

   git clone https://github.com/abhishekgurjar-in/country-finder.git
   cd country-finder

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Install dependencies:

   npm install

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Start the development server:

   npm start

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Usage

Search for a Country: Enter a country name in the search bar to filter the list of countries.
Filter by Region: Select a region from the dropdown menu to see countries in that region.
View Details: Click on a country card to view detailed information about the country.

Code Explanation

App.js

The App component wraps the Header and Outlet components within a ThemeProvider, managing the theme state across the application.

import Header from "./components/Header";
import { Outlet } from "react-router-dom";
import "./App.css";
import { ThemeProvider } from "./contexts/ThemeContext";

const App = () => {
  return (
    <ThemeProvider>
      <Header />
      <Outlet />
    </ThemeProvider>
  );
};

export default App;

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Header.js

The Header component allows users to toggle between light and dark themes and displays the application title.

import { useTheme } from "../hooks/useTheme"

export default function Header() {
  const [isDark, setIsDark] =  useTheme();

  return (
    <header className={`header-container ${isDark ? 'dark' : ''}`}>
      <div className="header-content">
        <h2 className="title">
          <a href="/">Country Finder</a>
        </h2>
        <p className="theme-changer" onClick={() => {
          setIsDark(!isDark);
          localStorage.setItem('isDarkMode', !isDark);
        }}>
          <i className={`fa-solid fa-${isDark ? 'sun' : 'moon'}`} />
            {isDark ? 'Light' : 'Dark'} Mode
        </p>
      </div>
    </header>
  )
}

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Home.js

The Home component contains the search bar, filter menu, and lists the countries based on the search and filter criteria.

import React, { useState } from 'react';
import SearchBar from './SearchBar';
import SelectMenu from './SelectMenu';
import CountriesList from './CountriesList';
import { useTheme } from '../hooks/useTheme';

export default function Home() {
  const [query, setQuery] = useState('');
  const [isDark] = useTheme();

  return (
    <main className={`${isDark ? 'dark' : ''}`}>
      <div className="search-filter-container">
        <SearchBar setQuery={setQuery} />
        <SelectMenu setQuery={setQuery} />
      </div>
      <CountriesList query={query} />
    </main>
  )
}

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SearchBar.js

The SearchBar component handles user input for searching countries.

import React from 'react';

export default function SearchBar({ setQuery }) {
  return (
    <div className="search-container">
      <i className="fa-solid fa-magnifying-glass"></i>
      <input
        onChange={(e) => setQuery(e.target.value.toLowerCase())}
        type="text"
        placeholder="Search for a country..."
      />
    </div>
  )
}

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SelectMenu.js

The SelectMenu component provides a dropdown for filtering countries by region.

import React from 'react';

export default function SelectMenu({ setQuery }) {
  return (
    <select className="filter-by-region" onChange={(e) => setQuery(e.target.value.toLowerCase())}>
      <option hidden>Filter by Region</option>
      <option value="Africa">Africa</option>
      <option value="Americas">Americas</option>
      <option value="Asia">Asia</option>
      <option value="Europe">Europe</option>
      <option value="Oceania">Oceania</option>
    </select>
  )
}

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CountriesList.js

The CountriesList component fetches and displays a list of countries.

import React, { useEffect, useState } from 'react';
import CountryCard from './CountryCard';
import CountriesListShimmer from './CountriesListShimmer';

export default function CountriesList({ query }) {
  const [countriesData, setCountriesData] = useState([]);

  useEffect(() => {
    fetch('https://restcountries.com/v3.1/all')
      .then((res) => res.json())
      .then((data) => {
        setCountriesData(data);
      });
  }, []);

  if (!countriesData.length) {
    return <CountriesListShimmer />;
  }

  return (
    <div className="countries-container">
      {countriesData
        .filter((country) =>
          country.name.common.toLowerCase().includes(query) || country.region.toLowerCase().includes(query)
        )
        .map((country) => (
          <CountryCard
            key={country.name.common}
            name={country.name.common}
            flag={country.flags.svg}
            population={country.population}
            region={country.region}
            capital={country.capital?.[0]}
            data={country}
          />
        ))}
    </div>
  )
}

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CountryDetail.js

The CountryDetail component fetches and displays detailed information about a selected country.

import React, { useEffect, useState } from 'react';
import { Link, useLocation, useParams } from 'react-router-dom';
import { useTheme } from '../hooks/useTheme';
import CountryDetailShimmer from './CountryDetailShimmer';
import './CountryDetail.css';

export default function CountryDetail() {
  const [isDark] = useTheme();
  const params = useParams();
  const { state } = useLocation();
  const countryName = params.country;

  const [countryData, setCountryData] = useState(null);
  const [notFound, setNotFound] = useState(false);

  function updateCountryData(data) {
    setCountryData({
      name: data.name.common || data.name,
      nativeName: Object.values(data.name.nativeName || {})[0]?.common,
      population: data.population,
      region: data.region,
      subregion: data.subregion,
      capital: data.capital,
      flag: data.flags.svg,
      tld: data.tld,
      languages: Object.values(data.languages || {}).join(', '),
      currencies: Object.values(data.currencies || {})
        .map((currency) => currency.name)
        .join(', '),
      borders: [],
    });

    if (!data.borders) {
      data.borders = [];
    }

    Promise.all(
      data.borders.map((border) =>
        fetch(`https://restcountries.com/v3.1/alpha/${border}`)
          .then((res) => res.json())
          .then(([borderCountry]) => borderCountry.name.common)
      )
    ).then((borders) => {
      setTimeout(() =>
        setCountryData((prevState) => ({ ...prevState, borders }))
      );
    });
  }

  useEffect(() => {
    if (state) {
      updateCountryData(state);
      return;
    }

    fetch(`https://restcountries.com/v3.1/name/${countryName}?fullText=true`)


 .then((res) => res.json())
      .then(([data]) => {
        if (!data) {
          setNotFound(true);
        } else {
          updateCountryData(data);
        }
      })
      .catch(() => setNotFound(true));
  }, [countryName, state]);

  if (notFound) {
    return (
      <div className={`error-container ${isDark ? 'dark' : ''}`}>
        <h3>Country not found</h3>
        <Link to="/">Back to home</Link>
      </div>
    );
  }

  if (!countryData) {
    return <CountryDetailShimmer />;
  }

  return (
    <div className={`country-detail-container ${isDark ? 'dark' : ''}`}>
      <Link to="/" className="back-button">
        <i className="fa-solid fa-arrow-left" />
         Back
      </Link>
      <div className="country-detail-content">
        <img src={countryData.flag} alt={`${countryData.name} flag`} />
        <div className="country-detail-info">
          <h1>{countryData.name}</h1>
          <div className="details">
            <p><strong>Native Name:</strong> {countryData.nativeName}</p>
            <p><strong>Population:</strong> {countryData.population}</p>
            <p><strong>Region:</strong> {countryData.region}</p>
            <p><strong>Subregion:</strong> {countryData.subregion}</p>
            <p><strong>Capital:</strong> {countryData.capital}</p>
            <p><strong>Top Level Domain:</strong> {countryData.tld}</p>
            <p><strong>Languages:</strong> {countryData.languages}</p>
            <p><strong>Currencies:</strong> {countryData.currencies}</p>
            <p><strong>Border Countries:</strong> {countryData.borders.join(', ') || 'None'}</p>
          </div>
        </div>
      </div>
    </div>
  );
}

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CountryDetailShimmer.js

The CountryDetailShimmer component shows a loading placeholder while fetching country details.

import React from 'react';

export default function CountryDetailShimmer() {
  return (
    <div className="country-detail-shimmer">
      <div className="shimmer-img"></div>
      <div className="shimmer-info">
        <div className="shimmer-line name"></div>
        <div className="shimmer-line"></div>
        <div className="shimmer-line"></div>
        <div className="shimmer-line"></div>
        <div className="shimmer-line"></div>
      </div>
    </div>
  );
}

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CountryCard.js

The CountryCard component displays a brief overview of each country.

import React from 'react';
import { Link } from 'react-router-dom';

export default function CountryCard({ name, flag, population, region, capital, data }) {
  return (
    <div className="country-card">
      <img src={flag} alt={`${name} flag`} />
      <h3>{name}</h3>
      <p><strong>Population:</strong> {population}</p>
      <p><strong>Region:</strong> {region}</p>
      <p><strong>Capital:</strong> {capital}</p>
      <Link to={`/country/${name}`} state={data}>
        <button>More Details</button>
      </Link>
    </div>
  );
}

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CountriesListShimmer.js

The CountriesListShimmer component shows a loading placeholder while fetching the list of countries.

import React from 'react';

export default function CountriesListShimmer() {
  return (
    <div className="countries-list-shimmer">
      {Array.from({ length: 10 }).map((_, index) => (
        <div key={index} className="shimmer-card"></div>
      ))}
    </div>
  );
}

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Live Demo

You can view a live demo of the Country Finder application by visiting Country Finder Demo.

Conclusion

In this project, we built a Country Finder application using React that allows users to search for countries, filter them by region, and view detailed information. We integrated with the REST Countries API and used React's hooks and context to manage state and theming.

Credits

React: React
REST Countries API: REST Countries
Font Awesome: Font Awesome

Author

Abhishek Gurjar is a dedicated web developer passionate about creating practical and functional web applications. Check out more of his projects on GitHub.

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