JavaScript - Workers & Geolocation

Overview

Estimated time: 15–20 minutes

Web Workers allow background processing, and the Geolocation API provides access to the user's location.

Learning Objectives

• Use Web Workers for background tasks.
• Access geolocation data with permission.

Prerequisites

• JavaScript - URL & Query Params

Web Workers

const worker = new Worker('worker.js');
worker.postMessage('start');
worker.onmessage = function(e) {
  console.log('Worker said:', e.data);
};

Geolocation API

navigator.geolocation.getCurrentPosition(function(pos) {
  console.log(pos.coords.latitude, pos.coords.longitude);
});

Common Pitfalls

• Web Workers can't access the DOM directly.
• Geolocation requires user permission and may fail if denied.

Summary

Web Workers and Geolocation are powerful browser APIs for performance and user experience.