Project Overview

This weather application provides users with real-time weather information for any location worldwide. Built with vanilla JavaScript and modern web APIs, it offers a clean, intuitive interface with detailed weather data, forecasts, and location-based services.

Weather App Interface
Current Weather 7-Day Forecast Hourly Forecast Mobile View

Key Features

Location Detection

Automatic location detection using browser's geolocation API

City Search

Search for weather in any city worldwide with autocomplete

7-Day Forecast

Extended weather forecast with detailed daily predictions

Hourly Forecast

24-hour weather forecast with temperature trends

Favorite Locations

Save and manage favorite cities for quick access

Dynamic Backgrounds

Weather-based background themes and animations

Technical Implementation

API Integration

  • OpenWeather API for current weather and forecasts
  • Geolocation API for automatic location detection
  • Error handling for API failures and rate limits
  • Caching mechanisms to reduce API calls
  • Data transformation and normalization

Frontend Development

  • Vanilla JavaScript with ES6+ features
  • Modular code structure with classes and modules
  • DOM manipulation and event handling
  • CSS animations and transitions
  • Responsive design with CSS Grid and Flexbox

Data Management

  • Local Storage for user preferences and favorites
  • Session Storage for temporary data
  • JSON data parsing and validation
  • State management patterns

Code Highlights

Weather API Integration

class WeatherAPI {
  async getCurrentWeather(lat, lon) {
    try {
      const response = await fetch(
        `${this.baseURL}/weather?lat=${lat}&lon=${lon}&appid=${this.apiKey}&units=metric`
      );
      
      if (!response.ok) {
        throw new Error(`HTTP error! status: ${response.status}`);
      }
      
      return await response.json();
    } catch (error) {
      console.error('Error fetching weather data:', error);
      throw error;
    }
  }
}

Location Detection

function getCurrentLocation() {
  return new Promise((resolve, reject) => {
    if (!navigator.geolocation) {
      reject(new Error('Geolocation not supported'));
      return;
    }
    
    navigator.geolocation.getCurrentPosition(
      (position) => {
        resolve({
          lat: position.coords.latitude,
          lon: position.coords.longitude
        });
      },
      (error) => reject(error),
      { timeout: 10000, enableHighAccuracy: true }
    );
  });
}

Challenges & Solutions

API Rate Limiting

Challenge: Managing API call limits while providing smooth user experience.

Solution: Implemented intelligent caching and debouncing for search queries.

Cross-browser Geolocation

Challenge: Handling different browser implementations of geolocation API.

Solution: Added fallback mechanisms and comprehensive error handling.

Performance Optimization

Challenge: Smooth animations while handling real-time data updates.

Solution: Used CSS transforms and implemented efficient DOM update strategies.