This is my solution to Frontend Mentor REST Countries API with color theme switcher challenge.

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Table of contents

• Overview
  • The challenge
  • Links
• My process
  • Built with
  • What I learned
• Author

Overview

The challenge is to integrate with the REST Countries API to pull country data and display it like in the designs.

The challenge

User should be able to:

• See all countries from the API on the homepage
• Search for a country using an input field
• Filter countries by region
• Click on a country to see more detailed information on a separate page
• Click through to the border countries on the detail page
• Toggle the color scheme between light and dark mode (optional)

Links

• Solution
• Live Preview

My process

Built with:

• HTML5
• SCSS
• React
• React Router
• REST COUNTRIES

What I learned

• GET data from API with React Hooks.

const [isLoaded, setIsLoaded] = useState(false);
const [items, setItems] = useState([]);

useEffect(() => {
  getData();
}, [])

const getData = () => {
  fetch("https://restcountries.com/v3.1/all")
    .then(res => res.json())
    .then(
    (results) => {
      setIsLoaded(true);
      setItems(results);
      // console.log(results)
    }
  )
}

• GET parameter with useParams().

import { useParams } from 'react-router-dom';

const [isLoaded, setIsLoaded] = useState(false);
const [items, setItems] = useState([]);

let { name } = useParams();

useEffect(() => {
  fetch(`https://restcountries.com/v3.1/alpha/${name}`)
    .then(res => res.json())
    .then(
    (results) => {
      setIsLoaded(true);
      setItems(results);
      console.log(results);
    }
  )
}, [name])

• Filtering data.

const [items, setItems] = useState([]);
const [filteredItems, setFilteredItems] = useState([]);
const [searchInput, setSearchInput] = useState("");
const [selectInput, setSelectInput] = useState("");
const regionList = ["Africa", "Americas", "Asia", "Europe", "Oceania"];

const handleChangeInput = (e) => {
  setSearchInput(e.target.value);
};
const handleChangeSelect = (e) => {
  setSelectInput(e.target.value);
};

useEffect(() => {
  const result = items.filter(
    (item) =>
      (!searchInput ||
        item.name.common.toLowerCase().includes(searchInput.toLowerCase())) &&
      (!selectInput || item.region === selectInput)
  );
  setFilteredItems(result);
  console.log(result);
}, [searchInput, items, selectInput]);

<input type="text" placeholder="Search for a country" disabled={isLoaded ? false : true} value={searchInput} onChange={handleChangeInput} />

<select className="form__select" onChange={handleChangeSelect}>
  <option value="">All</option>
  {regionList.map((region) => (
    <option value={region} key={region}>
      {region}
    </option>
  ))}
</select>

• Handle theme with localStorage.

const [isActive, setActive] = useState("false");
localStorage.getItem('theme');

const handleToggle = () => {
  setActive(!isActive);
  if (isActive === true) {
    localStorage.setItem('theme', 'dark');
  } else {
    localStorage.setItem('theme', 'light');
  }
}

<div className={localStorage.getItem("theme") === "light" ? "App light-theme" : "App dark-theme"}>
  <Navbar onClick={handleToggle} />
  <Routes />
</div>

For theme style, I use SCSS nesting. If App have class light-theme then, children item such as card, input, and skeleton loading will have light background color and dark font, and if App have class dark-theme then, children item will have dark background and light font.

• Make skeleton loading. For example I'm going to use card component.

const [isLoaded, setIsLoaded] = useState(false);

useEffect(() => {
  getData();
}, [])

const getData = () => {
  fetch("https://restcountries.com/v3.1/all")
    .then(res => res.json())
    .then(
    (results) => {
      // When results is loaded, we set isLoaded to true
      setIsLoaded(true);
      setItems(results);
      // console.log(results)
    }
  )
}

For the HTML, if isLoaded is false then add class skeleton to form__search and disabled input.

<div className={isLoaded ? 'form__search' : 'form__search skeleton' }>
  <ion-icon name="search"></ion-icon>
  <input type="text" placeholder="Search for a country" disabled={isLoaded ? false : true} value={searchInput} onChange={handleChangeInput} />
</div>

For styling I use SCSS nesting.

// variable
//color for dark theme
$dark-background: #202c37;
$dark-element: #2b3945;
$dark-text: #ffffff;

//color for light theme
$light-background: #fafafa;
$light-element: #ffffff;
$light-text: #111517;

//mixin
@mixin skeleton {
  content: "" !important;
  width: 50px;
  position: absolute;
  height: 100%;
  animation-name: gradient-animation;
  animation-duration: 2s;
  animation-iteration-count: infinite;
  filter: blur(5px);
}

@mixin skeleton-dark {
  background: $dark-element !important;

  &::after {
    background: linear-gradient(
      to right,
      $dark-element 25%,
      $dark-background 50%,
      $dark-element 100%
    );
  }
}

@mixin skeleton-light {
  background-color: #e2e2e2;

  &::after {
    background: linear-gradient(
      to right,
      #e2e2e2 25%,
      #d5d5d5 50%,
      #e2e2e2 100%
    );
  }
}

// input base

.form {
  &__search {
    display: flex;
    align-items: center;
    width: 480px;
    padding: 0 32px;
    border-radius: 8px;

    ion-icon {
      font-size: 18px;
      margin-right: 24px;
    }
    input {
      border: none;
      outline: none;
      padding: 18px 0;
      width: 100%;
      font-weight: 600;
      font-size: 14px;
      letter-spacing: -0.01em;
      background-color: transparent;
    }
  }
  &__search.skeleton {
    color: transparent;
    position: relative;
    overflow: hidden;
    border-radius: 0;

    ion-icon {
      color: transparent !important;
    }
    input {
      color: transparent !important;

      &::placeholder {
        color: transparent !important;
      }
    }
    &::after {
      @include skeleton;
      margin: 0 -32px;
    }
  }
}

@keyframes gradient-animation {
  from {
    left: 0%;
  }
  to {
    left: 100%;
  }
}

// dark theme

.dark-theme {
  .form {
    &__search {
      background: $dark-element;

      ion-icon {
        color: $dark-text;
      }
      input {
        color: $dark-text;

        &::placeholder {
          color: $dark-text;
        }
      }
    }
    &__search.skeleton {
      @include skeleton-dark;
    }
  }
}

// light theme

.light-theme {
  .form {
    &__search {
      background: $light-element;

      ion-icon {
        color: $light-text;
      }
      input {
        color: $light-text;

        &::placeholder {
          color: hsl(0, 0%, 52%);
        }
      }
    }
    &__search.skeleton {
      @include skeleton-light;
    }
  }
}

Author

• Frontend Mentor: @NabillaTrisnani
• Github: @NabillaTrisnani
• LinkendIn: Nabilla Trisnani
• Twitter: @NabillaTrisnani