Weather Application And Location In JavaScript

Introduction 

 

In this article, you will learn how to create a temperature appliction 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 below code,

*{
    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 p:hover{

}

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

.temperature-description{

}

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

.location{

}

.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){
    let latitude = position.coords.latitude;
    let longitude = position.coords.longitude;

    getWeather(latitude, longitude);
}

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

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

    fetch(api)
        .then(function(response){
            let data = response.json();
            return data;
        })
        .then(function(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(function(){
            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"){
        let fahrenheit = celsiusToFahrenheit(weather.temperature.value);
        fahrenheit = Math.floor(fahrenheit);

        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,

 

 

 

 

 

Summary

 

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