Software Projects

How to Build A Weather App in HTML CSS and JavaScript

Is it true that you are new to web advancement and anxious to improve your abilities by dealing with down to earth projects? Look no further! Building a climate application is an incredible method for starting your excursion. With just HTML, CSS, and JavaScript, you can make an application that further develops your web improvement capacities as well as makes you acquainted with JavaScript Programming interface calls.

In this blog entry, I’ll direct you through building a climate application project utilizing HTML, CSS, and JavaScript without any preparation. Assuming that you lean toward utilizing Bootstrap, I’ve proactively canvassed that in a past blog entry on making a Climate Application in HTML, Bootstrap, and JavaScript. Notwithstanding, this weather conditions project has a few additional highlights that make it more helpful.

In this climate application project, clients can enter any city name to get the 5-day weather conditions conjecture or basically click on the “Utilization Current Area” button to get their ongoing area’s weather conditions subtleties, including temperature, wind speed, dampness, and that’s just the beginning.

Steps To Create Weather App in HTML & JavaScript

To create your weather app using HTML, CSS, and JavaScript, follow these step-by-step instructions:

  1. Create a folder. You can name this folder whatever you want, and inside this folder, create the mentioned files.
  2. Create an index.html file. The file name must be index and its extension .html
  1. Create a style.css file. The file name must be style and its extension .css
  2. Create a script.js file. The file name must be script and its extension .js

Index.html file

<!DOCTYPE html>
<!-- Coding By CodingNepal - www.codingnepalweb.com -->
<html lang="en">
  <head>
    <meta charset="utf-8">
    <title>Weather App Project JavaScript | CodingNepal</title>
    <link rel="stylesheet" href="style.css">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <script src="script.js" defer></script>
  </head>
  <body>
    <h1>Weather Dashboard</h1>
    <div class="container">
      <div class="weather-input">
        <h3>Enter a City Name</h3>
        <input class="city-input" type="text" placeholder="E.g., New York, London, Tokyo">
        <button class="search-btn">Search</button>
        <div class="separator"></div>
        <button class="location-btn">Use Current Location</button>
      </div>
      <div class="weather-data">
        <div class="current-weather">
          <div class="details">
            <h2>_______ ( ______ )</h2>
            <h6>Temperature: __°C</h6>
            <h6>Wind: __ M/S</h6>
            <h6>Humidity: __%</h6>
          </div>
        </div>
        <div class="days-forecast">
          <h2>5-Day Forecast</h2>
          <ul class="weather-cards">
            <li class="card">
              <h3>( ______ )</h3>
              <h6>Temp: __C</h6>
              <h6>Wind: __ M/S</h6>
              <h6>Humidity: __%</h6>
            </li>
            <li class="card">
              <h3>( ______ )</h3>
              <h6>Temp: __C</h6>
              <h6>Wind: __ M/S</h6>
              <h6>Humidity: __%</h6>
            </li>
            <li class="card">
              <h3>( ______ )</h3>
              <h6>Temp: __C</h6>
              <h6>Wind: __ M/S</h6>
              <h6>Humidity: __%</h6>
            </li>
            <li class="card">
              <h3>( ______ )</h3>
              <h6>Temp: __C</h6>
              <h6>Wind: __ M/S</h6>
              <h6>Humidity: __%</h6>
            </li>
            <li class="card">
              <h3>( ______ )</h3>
              <h6>Temp: __C</h6>
              <h6>Wind: __ M/S</h6>
              <h6>Humidity: __%</h6>
            </li>
          </ul>
        </div>
      </div>
    </div>
    
  </body>
</html>

Styles.css File

/* Import Google font - Open Sans */
@import url('https://fonts.googleapis.com/css2?family=Open+Sans:wght@400;500;600;700&display=swap');
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Open Sans', sans-serif;
}
body {
  background: #E3F2FD;
}
h1 {
  background: #5372F0;
  font-size: 1.75rem;
  text-align: center;
  padding: 18px 0;
  color: #fff;
}
.container {
  display: flex;
  gap: 35px;
  padding: 30px;
}
.weather-input {
  width: 550px;
}
.weather-input input {
  height: 46px;
  width: 100%;
  outline: none;
  font-size: 1.07rem;
  padding: 0 17px;
  margin: 10px 0 20px 0;
  border-radius: 4px;
  border: 1px solid #ccc;
}
.weather-input input:focus {
  padding: 0 16px;
  border: 2px solid #5372F0;
}
.weather-input .separator {
  height: 1px;
  width: 100%;
  margin: 25px 0;
  background: #BBBBBB;
  display: flex;
  align-items: center;
  justify-content: center;
}
.weather-input .separator::before{
  content: "or";
  color: #6C757D;
  font-size: 1.18rem;
  padding: 0 15px;
  margin-top: -4px;
  background: #E3F2FD;
}
.weather-input button {
  width: 100%;
  padding: 10px 0;
  cursor: pointer;
  outline: none;
  border: none;
  border-radius: 4px;
  font-size: 1rem;
  color: #fff;
  background: #5372F0;
  transition: 0.2s ease;
}
.weather-input .search-btn:hover {
  background: #2c52ed;
}
.weather-input .location-btn {
  background: #6C757D;
}
.weather-input .location-btn:hover {
  background: #5c636a;
}
.weather-data {
  width: 100%;
}
.weather-data .current-weather {
  color: #fff;
  background: #5372F0;
  border-radius: 5px;
  padding: 20px 70px 20px 20px;
  display: flex;
  justify-content: space-between;
}
.current-weather h2 {
  font-weight: 700;
  font-size: 1.7rem;
}
.weather-data h6 {
  margin-top: 12px;
  font-size: 1rem;
  font-weight: 500;
}
.current-weather .icon {
  text-align: center;
}
.current-weather .icon img {
  max-width: 120px;
  margin-top: -15px;
}
.current-weather .icon h6 {
  margin-top: -10px;
  text-transform: capitalize;
}
.days-forecast h2 {
  margin: 20px 0;
  font-size: 1.5rem;
}
.days-forecast .weather-cards {
  display: flex;
  gap: 20px;
}
.weather-cards .card {
  color: #fff;
  padding: 18px 16px;
  list-style: none;
  width: calc(100% / 5);
  background: #6C757D;
  border-radius: 5px;
}
.weather-cards .card h3 {
  font-size: 1.3rem;
  font-weight: 600;
}
.weather-cards .card img {
  max-width: 70px;
  margin: 5px 0 -12px 0;
}

@media (max-width: 1400px) {
  .weather-data .current-weather {
    padding: 20px;
  }
  .weather-cards {
    flex-wrap: wrap;
  }
  .weather-cards .card {
    width: calc(100% / 4 - 15px);
  }
}
@media (max-width: 1200px) {
  .weather-cards .card {
    width: calc(100% / 3 - 15px);
  }
}
@media (max-width: 950px) {
  .weather-input {
    width: 450px;
  }
  .weather-cards .card {
    width: calc(100% / 2 - 10px);
  }
}
@media (max-width: 750px) {
  h1 {
    font-size: 1.45rem;
    padding: 16px 0;
  }
  .container {
    flex-wrap: wrap;
    padding: 15px;
  }
  .weather-input {
    width: 100%;
  }
  .weather-data h2 {
    font-size: 1.35rem;
  }
}

Script.js File

const cityInput = document.querySelector(".city-input");
const searchButton = document.querySelector(".search-btn");
const locationButton = document.querySelector(".location-btn");
const currentWeatherDiv = document.querySelector(".current-weather");
const weatherCardsDiv = document.querySelector(".weather-cards");

const API_KEY = "YOUR-API-KEY-HERE"; // API key for OpenWeatherMap API

const createWeatherCard = (cityName, weatherItem, index) => {
    if(index === 0) { // HTML for the main weather card
        return `<div class="details">
                    <h2>${cityName} (${weatherItem.dt_txt.split(" ")[0]})</h2>
                    <h6>Temperature: ${(weatherItem.main.temp - 273.15).toFixed(2)}°C</h6>
                    <h6>Wind: ${weatherItem.wind.speed} M/S</h6>
                    <h6>Humidity: ${weatherItem.main.humidity}%</h6>
                </div>
                <div class="icon">
                    <img src="https://openweathermap.org/img/wn/${weatherItem.weather[0].icon}@4x.png" alt="weather-icon">
                    <h6>${weatherItem.weather[0].description}</h6>
                </div>`;
    } else { // HTML for the other five day forecast card
        return `<li class="card">
                    <h3>(${weatherItem.dt_txt.split(" ")[0]})</h3>
                    <img src="https://openweathermap.org/img/wn/${weatherItem.weather[0].icon}@4x.png" alt="weather-icon">
                    <h6>Temp: ${(weatherItem.main.temp - 273.15).toFixed(2)}°C</h6>
                    <h6>Wind: ${weatherItem.wind.speed} M/S</h6>
                    <h6>Humidity: ${weatherItem.main.humidity}%</h6>
                </li>`;
    }
}

const getWeatherDetails = (cityName, latitude, longitude) => {
    const WEATHER_API_URL = `https://api.openweathermap.org/data/2.5/forecast?lat=${latitude}&lon=${longitude}&appid=${API_KEY}`;

    fetch(WEATHER_API_URL).then(response => response.json()).then(data => {
        // Filter the forecasts to get only one forecast per day
        const uniqueForecastDays = [];
        const fiveDaysForecast = data.list.filter(forecast => {
            const forecastDate = new Date(forecast.dt_txt).getDate();
            if (!uniqueForecastDays.includes(forecastDate)) {
                return uniqueForecastDays.push(forecastDate);
            }
        });

        // Clearing previous weather data
        cityInput.value = "";
        currentWeatherDiv.innerHTML = "";
        weatherCardsDiv.innerHTML = "";

        // Creating weather cards and adding them to the DOM
        fiveDaysForecast.forEach((weatherItem, index) => {
            const html = createWeatherCard(cityName, weatherItem, index);
            if (index === 0) {
                currentWeatherDiv.insertAdjacentHTML("beforeend", html);
            } else {
                weatherCardsDiv.insertAdjacentHTML("beforeend", html);
            }
        });        
    }).catch(() => {
        alert("An error occurred while fetching the weather forecast!");
    });
}

const getCityCoordinates = () => {
    const cityName = cityInput.value.trim();
    if (cityName === "") return;
    const API_URL = `https://api.openweathermap.org/geo/1.0/direct?q=${cityName}&limit=1&appid=${API_KEY}`;
    
    // Get entered city coordinates (latitude, longitude, and name) from the API response
    fetch(API_URL).then(response => response.json()).then(data => {
        if (!data.length) return alert(`No coordinates found for ${cityName}`);
        const { lat, lon, name } = data[0];
        getWeatherDetails(name, lat, lon);
    }).catch(() => {
        alert("An error occurred while fetching the coordinates!");
    });
}

const getUserCoordinates = () => {
    navigator.geolocation.getCurrentPosition(
        position => {
            const { latitude, longitude } = position.coords; // Get coordinates of user location
            // Get city name from coordinates using reverse geocoding API
            const API_URL = `https://api.openweathermap.org/geo/1.0/reverse?lat=${latitude}&lon=${longitude}&limit=1&appid=${API_KEY}`;
            fetch(API_URL).then(response => response.json()).then(data => {
                const { name } = data[0];
                getWeatherDetails(name, latitude, longitude);
            }).catch(() => {
                alert("An error occurred while fetching the city name!");
            });
        },
        error => { // Show alert if user denied the location permission
            if (error.code === error.PERMISSION_DENIED) {
                alert("Geolocation request denied. Please reset location permission to grant access again.");
            } else {
                alert("Geolocation request error. Please reset location permission.");
            }
        });
}

locationButton.addEventListener("click", getUserCoordinates);
searchButton.addEventListener("click", getCityCoordinates);
cityInput.addEventListener("keyup", e => e.key === "Enter" && getCityCoordinates());

Please note that your weather app is still unable to show the weather forecast for any location because you’ve not provided your OpenWeatherMap API key in the API_KEY variable. To get a free API key, sign up for an account at https://home.openweathermap.org/api_keys. Your API key may take minutes or hours to activate. You’ll get an error like “Invalid API Key” or something similar during this time.

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