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Weather Application And Location In JavaScript

Introduction

In this article, you will learn how to create a temperature application and location in JavaScript.

Step 1. First, open a Sublime Text editor.

  • Open start -> Sublime Text Editor
  • Go to file -> File -> New File
  • Name of File -> Weather app.html

Step 2. Note that in the below sample, I have inserted CSS styles inside the <style> tag. You will create CSS styles for the notification and temperature value font sizes in the code below.

* {
    font-family: "Rimouski";
}

body {
    background-color: #293251;
}

.container {
    width: 300px;
    background-color: #FFF;
    display: block;
    margin: 0 auto;
    border-radius: 10px;
    padding-bottom: 50px;
}

.app-title {
    width: 300px;
    height: 50px;
    border-radius: 10px 10px 0 0;
}

.app-title p {
    text-align: center;
    padding: 15px;
    margin: 0 auto;
    font-size: 1.2em;
    color: #293251;
}

.notification {
    background-color: #f8d7da;
    display: none;
}

.notification p {
    color: #721c24;
    font-size: 1.2em;
    margin: 0;
    text-align: center;
    padding: 10px 0;
}

.weather-container {
    width: 300px;
    height: 260px;
    background-color: #F4F9FF;
}

.weather-icon {
    width: 300px;
    height: 128px;
}

.weather-icon img {
    display: block;
    margin: 0 auto;
}

.temperature-value {
    width: 300px;
    height: 60px;
}

.temperature-value p {
    padding: 0;
    margin: 0;
    color: #293251;
    font-size: 4em;
    text-align: center;
    cursor: pointer;
}

.temperature-value span {
    color: #293251;
    font-size: 0.5em;
}

.temperature-description p {
    padding: 8px;
    margin: 0;
    color: #293251;
    text-align: center;
    font-size: 1.2em;
}

.location p {
    margin: 0;
    padding: 0;
    color: #293251;
    text-align: center;
    font-size: 0.8em;
}

Step 3. Here, you will use some JavaScript along with HTML code. Just follow the steps to see how to create this temperature application.

const iconElement = document.querySelector(".weather-icon");
const tempElement = document.querySelector(".temperature-value p");
const descElement = document.querySelector(".temperature-description p");
const locationElement = document.querySelector(".location p");
const notificationElement = document.querySelector(".notification");

const weather = {};

weather.temperature = {
    unit: "celsius"
};

const KELVIN = 273;
const key = "82005d27a116c2880c8f0fcb866998a0";

if ('geolocation' in navigator) {
    navigator.geolocation.getCurrentPosition(setPosition, showError);
} else {
    notificationElement.style.display = "block";
    notificationElement.innerHTML = "<p>Browser doesn't Support Geolocation</p>";
}

function setPosition(position) {
    const latitude = position.coords.latitude;
    const longitude = position.coords.longitude;
    getWeather(latitude, longitude);
}

function showError(error) {
    notificationElement.style.display = "block";
    notificationElement.innerHTML = `<p>${error.message}</p>`;
}

function getWeather(latitude, longitude) {
    const api = `http://api.openweathermap.org/data/2.5/weather?lat=${latitude}&lon=${longitude}&appid=${key}`;

    fetch(api)
        .then(response => response.json())
        .then(data => {
            weather.temperature.value = Math.floor(data.main.temp - KELVIN);
            weather.description = data.weather[0].description;
            weather.iconId = data.weather[0].icon;
            weather.city = data.name;
            weather.country = data.sys.country;
        })
        .then(displayWeather);
}

function displayWeather() {
    iconElement.innerHTML = `<img src="icons/${weather.iconId}.png"/>`;
    tempElement.innerHTML = `${weather.temperature.value}°<span>C</span>`;
    descElement.innerHTML = weather.description;
    locationElement.innerHTML = `${weather.city}, ${weather.country}`;
}

function celsiusToFahrenheit(temperature) {
    return (temperature * 9/5) + 32;
}

tempElement.addEventListener("click", function() {
    if (weather.temperature.value === undefined) return;

    if (weather.temperature.unit === "celsius") {
        const fahrenheit = Math.floor(celsiusToFahrenheit(weather.temperature.value));
        tempElement.innerHTML = `${fahrenheit}°<span>F</span>`;
        weather.temperature.unit = "fahrenheit";
    } else {
        tempElement.innerHTML = `${weather.temperature.value}°<span>C</span>`;
        weather.temperature.unit = "celsius";
    }
});

Step 4. The Html 5 code below shows how to complete the code for the weather application.

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Weather App JavaScript</title>
    <link rel="stylesheet" href="font/Rimouski.css">
    <link rel="stylesheet" href="style.css">
</head>
<body>
    <div class="container">
        <h1 style="background-color: blue;">PRABAKARAN ACT</h1><br>
        <div class="app-title">
            <p>Weather</p>
        </div>
        <div class="notification"></div>
        <div class="weather-container">
            <div class="weather-icon">
                <img src="icons/unknown.png" alt="">
            </div>
            <div class="temperature-value">
                <p>- °<span>C</span></p>
            </div>
            <div class="temperature-description">
                <p> - </p>
            </div>
            <div class="location">
                <p>-</p>
            </div>
        </div>
    </div>
    <script src="app.js"></script>
</body>
</html>

Output

Right-click on the text window, and a dialog box appears, select->open a new browser.

Output

Output

Output

Summary

I hope you found this article interesting. We have created a weather application using JavaScript. Thanks for reading.


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