Course Description
This course provides a complete understanding of AJAX (Asynchronous JavaScript and XML), the core technology that powers every modern, dynamic web application. You will learn how to make background requests to a server to retrieve data and update parts of a web page without needing a full refresh.
We start with the fundamentals, exploring the core `XMLHttpRequest` object to understand how AJAX works at its lowest level. We then move into **jQuery's `$.ajax()` and its shorthand methods** as a common approach to simplify AJAX. Following that, we transition to the modern standard: the `Fetch API`, a powerful and flexible interface for making web requests. You'll learn how to handle Promises, process different data formats like JSON and text, and implement robust error handling.
The curriculum also covers how to interact with third-party REST APIs to bring external data into your applications. We'll explore security considerations like CORS and demonstrate how libraries like Axios can further simplify AJAX calls. By the end, you'll be able to build fast, responsive, and professional web applications that feel like native desktop apps.
What You'll Learn:
- The core principles of AJAX and asynchronous programming.
- Making requests with the foundational `XMLHttpRequest` object.
- **Comprehensive coverage of jQuery's AJAX methods (`$.ajax()`, `$.get()`, `$.post()`, `$.load()`).**
- Mastering the modern `Fetch API` and working with Promises and Async/Await.
- Handling different data formats (JSON, Text, XML, FormData).
- Robust error handling for network requests.
- Interacting with third-party REST APIs.
- Understanding and dealing with CORS issues.
- Using other libraries like Axios to simplify AJAX.
- Best practices for building responsive and efficient web applications.
Who Is This Course For?
This course is for any web developer who wants to build dynamic applications. It's an essential skill for front-end and full-stack developers. A solid understanding of JavaScript fundamentals (including functions, basic data types, and asynchronous concepts like callbacks) is required.
Prerequisites:
- Solid JavaScript Fundamentals: A strong understanding of core JavaScript concepts including variables, data types, functions, objects, arrays, and basic asynchronous concepts (callbacks).
- Basic HTML & CSS: Familiarity with HTML structure and basic CSS styling.
- A Computer/Laptop: A working computer (Windows, macOS, or Linux) with an internet connection.
- Basic Understanding of HTTP: Familiarity with what HTTP requests and responses are.
- A Willingness to Learn: Enthusiasm for building dynamic web applications.
Features practical projects like a real-time search feature and a weather app that fetches live data. Certificate of completion available. Available in English and Hindi.
1. What is Synchronous vs. Asynchronous Programming?
15min
2. Introduction to AJAX: History, Principles, and Why it's Important
20min
3. The Client-Server Model and HTTP Basics (Methods, Status Codes)
25min
4. Introduction to APIs and RESTful Concepts
20min
5. Recap & Practical Task: Explore API Documentation
30min
6. Creating and Sending Basic GET Requests with XHR
30min
7. XHR `readyState` and `status` Properties
25min
8. Handling XHR Events: `onload`, `onerror`, `onprogress`
30min
9. Sending Data with XHR: POST and Other Methods
25min
10. Understanding XHR's Callback-Based Nature and its Limitations
20min
11. Recap & Practical Task: Fetch Data with XHR
40min
12. Introduction to jQuery AJAX: Why and When to Use It
20min
13. The Comprehensive `$.ajax()` Method: Options and Callbacks
30min
14. jQuery AJAX Shorthand Methods: `$.get()`, `$.post()`, `$.load()`
25min
15. Handling Different Data Types with jQuery AJAX (JSON, XML, HTML, Text)
20min
16. Global AJAX Event Handlers in jQuery (`ajaxStart`, `ajaxStop`, etc.)
20min
17. Recap & Practical Task: Implement Data Fetching using jQuery AJAX
45min
18. Introduction to Fetch API: A Promise-Based Interface
25min
19. Making Basic GET Requests with Fetch
25min
20. Processing Responses: `response.json()`, `response.text()`, `response.blob()`, `response.formData()`
35min
21. Chaining Promises for Sequential Asynchronous Operations
30min
22. Handling Errors with `.catch()` and `response.ok` Property
30min
23. Recap & Practical Task: Create a Simple Data Fetcher with Fetch and Promises
50min
24. Making POST, PUT, PATCH, and DELETE Requests with Fetch
35min
25. Setting Request Headers (e.g., `Content-Type`, `Authorization`)
25min
26. Sending Different Data Formats (JSON, FormData for File Uploads)
30min
27. Advanced Request Options (`mode`, `cache`, `credentials`, `redirect`)
25min
28. Aborting Fetch Requests with `AbortController`
25min
29. Recap & Practical Task: Build a Form Submission with Fetch and File Upload
1hr
30. Revisiting Promises for Context
20min
31. The `async` and `await` Keywords for Cleaner Async Code
35min
32. Error Handling with `try...catch` Blocks in `async/await`
30min
33. Refactoring Fetch Calls to use `async/await`
25min
34. Concurrent Async Operations with `Promise.all()` and `async/await`
30min
35. Recap & Practical Task: Convert a Promise-based App to Async/Await
50min
36. Comprehensive Error Handling Strategies for Network Requests
30min
37. Handling Different Types of Network Errors (e.g., Offline, Timeouts)
25min
38. What is CORS (Cross-Origin Resource Sharing)?
25min
39. Common CORS Issues and Solutions (Preflight Requests, Proxies - Conceptual)
30min
40. Introduction to Authentication (API Keys, Tokens, OAuth - Conceptual)
25min
41. Displaying Loading States, Success Messages, and Error Messages (UI Feedback)
30min
42. Rate Limiting and Throttling API Calls (Conceptual)
20min
43. Recap & Practical Task: Implement Robust Error Handling & UI Feedback
50min
44. Simplifying Requests with Axios: Setup and Basic Usage
30min
45. Axios Configuration, Instance Creation, and Interceptors
35min
46. Axios Error Handling and Cancellation
25min
47. Brief Overview of Other AJAX Libraries (e.g., `ky`, `superagent`)
15min
48. Recap & Practical Task: Refactor a Fetch API App to use Axios
45min
49. Project 1: Live Search Feature with Public API (Fetch/Async Await)
1hr 15min
50. Project 2: Dynamic Weather App (Geolocation, Multiple API Calls, UI Updates)
1hr 30min
51. Final Project Review and Submission
45min
52. Recap & Course Conclusion
30min
