javascript
 
 
Copy code
let weather = {
  paris: {
    temp: 19.7,
    humidity: 80
  },
  tokyo: {
    temp: 17.3,
    humidity: 50
  },
  lisbon: {
    temp: 30.2,
    humidity: 20
  },
  "san francisco": {
    temp: 20.9,
    humidity: 100
  },
  oslo: {
    temp: -5,
    humidity: 20
  }
};

let roundedWeather = {};
for (let city in weather) {
  roundedWeather[city] = {};
  roundedWeather[city].temp = Math.ceil(weather[city].temp);
  roundedWeather[city].humidity = Math.ceil(weather[city].humidity);
}
console.log(roundedWeather);

let city = prompt("Enter a city");
if (weather[city] !== undefined) {
  city = city.toLowerCase();
  alert(
    `It is currently ${roundedWeather[city].temp}°C in ${city} with a humidity of ${roundedWeather[city].humidity}%`
  );
} else {
  alert(
    `Sorry we don't know the weather for this city, try going to https://www.google.com/search?q=weather+${[
      city
    ]}`
  );
}

Here is an example on how to put a weather emoji in JavaScript:

js
 
 
Copy code
// Use a Unicode value for weather emojis
const cloudy = "\u2601";
const sunny = "\u2600";

// You can then use the variable name to output the emoji
console.log(cloudy); // Output: ☁️
console.log(sunny); // Output: ☀️

You can find a list of Unicode values for emojis here.

To log the current temperature with the current latitude and longitude from the geolocation API, you can make an API call to a weather API that requires latitude and longitude coordinates as query parameters.

Here is an example in JavaScript using the OpenWeatherMap API:

javascript
 
 
Copy code
navigator.geolocation.getCurrentPosition((position) => {
  const lat = position.coords.latitude;
  const long = position.coords.longitude;
  const apiKey = '<YOUR_API_KEY>';
  const apiUrl = `https://api.openweathermap.org/data/2.5/weather?lat=${lat}&lon=${long}&appid=${apiKey}`;

  fetch(apiUrl)
    .then(response => response.json())
    .then(data => {
      const temp = data.main.temp;
      console.log(`The current temperature is ${temp} degrees Celsius at latitude ${lat} and longitude ${long}.`);
    })
    .catch(error => console.log(error));
});

In this example, we use the navigator.geolocation.getCurrentPosition() method to get the current position of the user. Then, we construct the API URL with the latitude, longitude, and API key. We use the fetch() method to make the API call, and then log the temperature and coordinates to the console.

Note: You will need to sign up for an API key from OpenWeatherMap to make this example work.

To display the temperature for a city after a user clicks the button Enter a city, you need to create an HTML form with an input field where the user can enter the city name. You can then use a server-side scripting language such as JavaScript and an API from a weather service provider, such as OpenWeather, to fetch the temperature data for that city. Once the data is returned, you can use JavaScript to display the temperature on the webpage.

Here's an example in JavaScript using the OpenWeather API:

javascript
 
 
Copy code
const form = document.querySelector('form');
const input = document.querySelector('input');
const tempDisplay = document.querySelector('#temperature');

form.addEventListener('submit', event => {
  event.preventDefault();

  const apiKey = {Insert Your API Key Here};
  const cityName = input.value.trim();

  fetch(`https://api.openweathermap.org/data/2.5/weather?q=${cityName}&units=metric&appid=${apiKey}`)
    .then(response => response.json())
    .then(data => {
      const temperature = data.main.temp;
      tempDisplay.textContent = `The temperature in ${cityName} is ${temperature}°C`;
    })
    .catch(error => {
      console.error(error);
      tempDisplay.textContent = `Couldn't retrieve temperature for ${cityName}. Please try again later.`;
    });
});

In this example, we listen for the form's submit event and prevent its default behavior (refreshing the page). We then get the input value, append it to the OpenWeather API URL along with the API key and the unit of measurement we want to use (metric in this case), and fetch the data using the fetch() method. We then extract the temperature from the JSON response and display it in the tempDisplay element. If there's an error, we log it to the console and display an error message in the same element.

Note that you will need to sign up for a free API key from OpenWeather to use their service.

To assign the weather value for a city when a user clicks on the search button, you can use an API (Application Programming Interface) that provides weather data for a given location.

First, you will need to obtain an API key from a weather API provider such as OpenWeatherMap or AccuWeather. Then, you can use an AJAX request in JavaScript to send a GET request with the city name and API key to the weather API.

Once you receive the response from the weather API, you can parse the JSON data to extract the weather values such as temperature, humidity, and wind speed. You can then dynamically update the weather values on your web page.

Here's an example of how to use the OpenWeatherMap API to get the weather for a specific city using JavaScript:

javascript
 
 
Copy code
const apiKey = 'YOUR_API_KEY';
const city = 'London';

fetch(`https://api.openweathermap.org/data/2.5/weather?q=${city}&appid=${apiKey}`)
  .then(response => response.json())
  .then(data => {
    const temperature = data.main.temp;
    const humidity = data.main.humidity;
    const windSpeed = data.wind.speed;

    // Update the weather values on your web page
    document.getElementById('temperature').innerHTML = temperature;
    document.getElementById('humidity').innerHTML = humidity;
    document.getElementById('wind-speed').innerHTML = windSpeed;
  })
  .catch(error => console.log(error));

In this example, we use the fetch method to make a GET request to the OpenWeatherMap API with the city name and API key as parameters. We then use the json() method to parse the response into JSON format.

Next, we extract the weather values from the JSON data and update the respective elements on our web page using their id. Note that this example assumes that you have HTML elements with the id of temperature, humidity, and wind-speed to display the weather values.

To display the temperature and name of a city on a webpage, you can use an API (Application Programming Interface) like OpenWeatherMap. You can make a request to the API using JavaScript and then display the city name and temperature on your webpage.

Here's an example using JavaScript:

javascript
 
 
Copy code
// replace CITY_NAME and API_KEY with your own values
const apiURL = `https://api.openweathermap.org/data/2.5/weather?q=CITY_NAME&appid=API_KEY&units=metric`;

async function getWeather() {
  const response = await fetch(apiURL);
  const weatherData = await response.json();
  const cityName = weatherData.name;
  const temperature = weatherData.main.temp;
  document.getElementById("city-name").innerText = cityName;
  document.getElementById("temperature").innerText = temperature + "°C";
}

getWeather();

In this example, we're using the fetch function to make a request to the OpenWeatherMap API. We pass in the city name and API key as parameters in the URL.

Once we get the weather data, we extract the city name and temperature from the response JSON object. We then set the innerText of two HTML elements with the id "city-name" and "temperature" to display the city name and temperature on the page.

Note that you'll need to sign up for an API key with OpenWeatherMap to use their API. You can follow their documentation to get started: https://openweathermap.org/api.

I'm assuming you want to display weather information and graphics on your website or application. To do this, you can make use of weather APIs that provide weather information in different formats. One of the popular weather APIs is the OpenWeather API, which provides current weather data, forecasts, and historical data in JSON/XML formats.

Once you have the weather data, you can display it using visual elements such as icons, images, or graphs. Here's an example using HTML, CSS, and JavaScript to display weather information and an icon for the current weather condition:

html
 
 
Copy code
<!-- HTML -->
<div class="weather-info">
  <h2>Weather in New York</h2>
  <div class="icon">
    <img src="" alt="weather icon">
  </div>
  <p class="temperature"></p>
  <p class="description"></p>
</div>

css
 
 
Copy code
/* CSS */
.weather-info {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.icon {
  width: 100px;
  height: 100px;
}

.icon img {
  width: 100%;
  height: 100%;
}

javascript
 
 
Copy code
// JavaScript using the OpenWeather API (make sure to sign up for a free API key)
const API_KEY = 'YOUR_API_KEY';
const CITY = 'New York';
const WEATHER_API = `https://api.openweathermap.org/data/2.5/weather?q=${CITY}&appid=${API_KEY}&units=metric`;

const weatherIcon = document.querySelector('.icon img');
const temperature = document.querySelector('.temperature');
const description = document.querySelector('.description');

fetch(WEATHER_API)
  .then(response => response.json())
  .then(data => {
    console.log(data);
    const iconURL = `https://openweathermap.org/img/wn/${data.weather[0].icon}.png`;
    weatherIcon.setAttribute('src', iconURL);
    temperature.textContent = `${data.main.temp}°C`;
    description.textContent = data.weather[0].description;
  })
  .catch(error => console.log(error));

This code fetches weather data for New York using the OpenWeather API, retrieves the current temperature, description, and weather icon URL, and updates the HTML elements with the corresponding data. You can customize the HTML and CSS to suit your needs and add more features such as hourly forecasts, graphs, and maps.

To set up a default city in JavaScript and show the weather for that city, you can use an API that provides weather data based on the City's name such as OpenWeatherMap API. Here's an example code snippet on how to accomplish this:

javascript
 
 
Copy code
// Set default city
const defaultCity = "Paris";

// API endpoint for fetching weather data
const weatherAPI = `https://api.openweathermap.org/data/2.5/weather?q=${defaultCity}&appid=your_app_id`;

// Fetch weather data and display in console
fetch(weatherAPI)
  .then(response => response.json())
  .then(data => console.log(data));

In the code above, we've set defaultCity to "Paris". We then use the OpenWeatherMap API to fetch weather data for Paris. You'll need to replace your_app_id with your own API key.

Once we've obtained the weather data, we could display it on a web page, or manipulates it in any other ways as per requirement.

You can log the current temperature of a city by using an API that provides weather information. One common weather API is OpenWeatherMap.

To get the current temperature of a city using OpenWeatherMap API, you can make an HTTP request to the API with the city name and your API key, and then extract the temperature from the response.

Here's an example code in JavaScript:

javascript
 
 
Copy code
const api_key = 'YOUR_API_KEY';
const city_name = 'London';

fetch(`https://api.openweathermap.org/data/2.5/weather?q=${city_name}&appid=${api_key}`)
  .then(response => response.json())
  .then(data => {
    const temp = data.main.temp;
    console.log(`The current temperature in ${city_name} is ${temp} K`);
  })
  .catch(error => console.error(error));

In this example, we're using the fetch() function to make an HTTP GET request to the OpenWeatherMap API with the city name (in this case, London) and our API key. We're then extracting the temperature information from the response using data.main.temp and logging it to the console. Note that the temperature is returned in Kelvin.

If the city you put in to find temperature has multiple locations, the API will return the weather data for the first location in the list. You can specify the state or country code in your query to get more accurate results. Alternatively, you can use the latitude and longitude coordinates of the location to get the exact weather data.

javascript
 
 
Copy code
// Creating an object called "weather" and console logging it
const weather = {
  temperature: 25,
  condition: 'Sunny',
  humidity: 70
};

console.log(weather);

Output:

code
 
 
Copy code
{ temperature: 25, condition: 'Sunny', humidity: 70 }

code
 
 
Copy code
// JavaScript weather search engine using fake data

// fake data for demo purposes
const cities = [
  { name: "New York", temperature: "13", weather: "Cloudy" },
  { name: "San Francisco", temperature: "20", weather: "Sunny" },
  { name: "London", temperature: "8", weather: "Rainy" },
  { name: "Sydney", temperature: "25", weather: "Sunny" },
  { name: "Tokyo", temperature: "15", weather: "Partly Cloudy" }
];

// function to search for a city's weather
function searchCity(cityName) {
  // iterate through the fake data to find a match
  for (let i = 0; i < cities.length; i++) {
    if (cities[i].name.toLowerCase() === cityName.toLowerCase()) {
      // if a match is found, return the temperature and weather
      const cityTemp = cities[i].temperature;
      const cityWeather = cities[i].weather;
      return `The temperature in ${cityName} is ${cityTemp}C and it is ${cityWeather} today.`;
    }
  }
  // if no match is found, return an error message
  return `Sorry, we could not find any weather data for ${cityName}.`;
}

// example usage
console.log(searchCity("San Francisco")); // output: The temperature in San Francisco is 20C and it is Sunny today.
console.log(searchCity("Paris")); // output: Sorry, we could not find any weather data for Paris.

This is a simple weather search engine using fake data. The code is written in JavaScript. It consists of a cities array containing fake data for demonstration purposes, and a function called searchCity that takes a cityName parameter and searches for a corresponding city in the cities array.

If a match is found, the function returns a string with the temperature and weather for that city. If no match is found, the function returns an error message.

To use the search engine, simply call the searchCity function with the name of the city you want to search for. For example, searchCity("San Francisco") would return "The temperature in San Francisco is 20C and it is Sunny today." while searchCity("Paris") would return "Sorry, we could not find any weather data for Paris."

javascript
 
 
Copy code
// Get geolocation data 
navigator.geolocation.getCurrentPosition(function(position) {

  // Set latitude and longitude 
  let lat = position.coords.latitude;
  let lon = position.coords.longitude;

  // Fetch data from the openweathermap API
  fetch(`http://api.openweathermap.org/data/2.5/weather?lat=${lat}&lon=${lon}&APPID=<YOUR_API_KEY>`)
    .then(response => response.json())
    .then(data => {

      // Set a condition for the background image
      let condition = data.weather[0].main;
      let backgroundImage = '';
      // Select images based on condition
      switch(condition.toLowerCase()) {
        case 'clouds': backgroundImage = '/images/cloudy.jpg'; break;
        case 'rain': backgroundImage = '/images/rainy.jpg'; break;
        case 'snow': backgroundImage = '/images/snowy.jpg'; break;
        case 'clear': backgroundImage = '/images/sunny.jpg'; break;
        default: backgroundImage = '/images/default.jpg';
      }

      // Create a style element and set the selected image as the background
      let styleNode = document.createElement("style");
      document.head.appendChild(styleNode);
      styleNode.innerHTML = `html body { background-image: url('${backgroundImage}'); }`;
   });
});

HTML:

html
 
 
Copy code
<div>
    <h1>Weather Widget for Spain - Current</h1>
    <div id="weather-widget">
        <div>
            <span>Location</span>
            <span id="location"></span>
        </div>
        <div>
            <span>Current Temp</span>
            <span id="temp"></span>
        </div>
        <div>
            <span>Wind Speed</span>
            <span id="wind"></span>
        </div>
        <div>
            <span>Humidity </span>
            <span id="humidity"></span>
        </div>
    </div>
</div>

CSS:

css
 
 
Copy code
#weather-widget div {
    padding: 10px;
    display: flex;
    margin-bottom: 10px;
}

JavaScript:

javascript
 
 
Copy code
// get current weather data for Spain
const endpoint = "https://api.openweathermap.org/data/2.5/weather?q=Spain&appid=YOUR_API_KEY_GOES_HERE";

// make the request
const xhr = new XMLHttpRequest();
xhr.open('GET', endpoint, true);
xhr.send();

// when the request is done
xhr.onreadystatechange = function(){
    if(xhr.readyState == 4 && xhr.status == 200){
        // parse the response
        const response = JSON.parse(xhr.responseText);

        // get values from the response     
        const location = response.name;
        const temp = response.main.temp;
        const humidity = response.main.humidity;
        const wind = response.wind.speed;

        // update the weather widget HTML elements 
        document.getElementById('location').innerHTML = location;
        document.getElementById('temp').innerHTML = temp;
        document.getElementById('humidity').innerHTML = humidity;
        document.getElementById('wind').innerHTML = wind;
    }
}

You can use the JavaScript fetch() API to request data from a weather API. For example, this code snippet would return the forecasted temperature data for the next 5 days in the fiveDayForecast variable:

javascript
 
 
Copy code
let fiveDayForecast;

fetch('https://api.weather.com/forecast/daily?days=5&units=metric&key=[YOUR API KEY HERE]')
    .then(response => response.json())
    .then(data => {
        fiveDayForecast = data.forecast.forecastDay;
    });

More information on the fetch() API can be found in the MDN Fetch API Documentation.

To use an external library for weather icons in your code, you can use a package manager to install the library you want to use. For example, if you wanted to use React-Weather-Icons in a Node.js project, you would use the command npm install react-weather-icons. This would download the library and save it to the node_modules directory.

To use the library in your code, you can use import statements. For example, the following code would import the wiRainMix icon:

js
 
 
Copy code
import wiRainMix from 'react-weather-icons/lib/time/wi-rain-mix';

You can then use the React.createElement method to use the imported library:

js
 
 
Copy code
let weatherIcon = React.createElement(wiRainMix)

For more information, please refer to the React-Weather-Icons documentation.

To show the weather forecast for a week using an API with React, you will need to make an API call to a weather API provider, such as OpenWeatherMap. Then depending on the response data, you can display the forecasts for the week. Below is an example of how you can do this with Axios and React Hooks:

javascript
 
 
Copy code
import React, { useState, useEffect } from "react";
import axios from "axios";

const apiKey = "[YOUR_API_KEY]";

const App = () => {
  const [weatherInfo, setWeatherInfo] = useState(null);

  const getWeatherInfo = async () => {
    const { data } = await axios.get(
      `http://api.openweathermap.org/data/2.5/forecast?&q=London,uk&APPID=${apiKey}`
    );

    // set the state of the weatherInfo to the API response
    setWeatherInfo(data);
  };

  // useEffect to call our API when the component mounts
  useEffect(() => {
    getWeatherInfo();
  }, []);

  return (
    <div>
      {weatherInfo &&
        weatherInfo.list.map((forecast, i) => (
          <div key={i}>
            {/* Get the date from the API */}
            <h4>{forecast.dt_txt}</h4>
            <ul>
              <li>Temperature: {forecast.main.temp}</li>
              <li>Humidity: {forecast.main.humidity}</li>
            </ul>
          </div>
        ))}
    </div>
  );
};

export default App;

For a more thorough explanation, please see the OpenWeatherMap React Tutorial.

To create a simple weather forecast application with HTML and CSS, you can use the following code.

HTML:

code
 
 
Copy code
<div class="forecast">
  <div class="city">City,Country</div>
  <div class="temp"><h2>17°C</h2></div>
  <div class="date"><h2>Wednesday, April 22</h2></div>
  <div class="time"><h2>09:00</h2></div>  
  <h3>5 Day Forecast</h3>
  <div class="days">
    <div class="day">Thursday</div>
    <div class="forecast"><img src="assets/sun.png" alt="Sunny" />Sunny</div>
  </div>
  <div class="days">
    <div class="day">Friday</div>
    <div class="forecast"><img src="assets/cloud.png" alt="Cloudy" />Cloudy</div>
  </div>
  <div class="days">
    <div class="day">Saturday</div>
    <div class="forecast"><img src="assets/rain.png" alt="Rainy" />Rainy</div>
  </div>
  <div class="days">
    <div class="day">Sunday</div>
    <div class="forecast"><img src="assets/snow.png" alt="Snowy" />Snowy</div>
  </div>
  <div class="days">
    <div class="day">Monday</div>
    <div class="forecast"><img src="assets/sun.png" alt="Sunny" />Sunny</div>
  </div>
</div>

CSS:

code
 
 
Copy code
.forecast{
  width: 422px;
  background-color: #34495e;
  padding: 15px;
  border-radius: 5px;
}

.forecast .city {
  font-size: 26px;
  color: rgba(255,255,255,0.9);
  margin-bottom: 7px;
  font-weight: bold;
  text-align

js
 
 
Copy code
// write your code here
const axios = require("axios");

axios.get("https://api.openweathermap.org/data/2.5/weather?q=Lisbon&APPID={YOUR_API_KEY}")
  .then(response => {
    const weather = response.data;
    const lon = weather.coord.lon;
    const lat = weather.coord.lat;
    console.log(`The temperature in Lisbon is ${weather.main.temp}^oC`);
  })
  .catch(error => {
    console.log(error);
  });

This code uses the OpenWeatherMap API to get the current temperature in Lisbon. You will need to replace {YOUR_API_KEY} with your API key.