AJAX

Course Details

Creating an XMLHttpRequest Object
- Creating a new XMLHttpRequest() instance
- Understanding open(), send(), and onreadystatechange methods
- Working with GET and POST HTTP methods
- Sending data with a POST request
- Handling Response from Server
Basic AJAX Example in JavaScript
- Sending an AJAX Request to a Server
- Handling the Server Response
- Updating the HTML Content Dynamically
- Example: Fetching Data from a Server and Displaying it on a Webpage
AJAX Error Handling
- Checking the Status Code of the Response
- Handling Network Errors and Request Failures
- Using try...catch for Error Handling

Why Use jQuery for AJAX?
- Simplifying AJAX Calls with jQuery
- jQuery AJAX Methods: $.ajax(), $.get(), $.post()
- Making GET and POST Requests with jQuery
- Handling Responses in JSON, HTML, or XML Formats
AJAX Request and Response with jQuery
- Sending and Receiving Data in JSON Format
- Working with Data from a Server (Displaying JSON data)
- Example: Using jQuery to Fetch Data from a REST API
Using jQuery AJAX for Form Submissions
- Sending Form Data via AJAX Without Page Refresh
- Form Validation and Handling Form Submission with AJAX
- Example: Submitting a Form via AJAX
AJAX Success, Error, and Complete Callbacks
- Using success(), error(), and complete() Callback Functions in jQuery
- Chaining AJAX Calls in jQuery

Understanding JSON (JavaScript Object Notation)
- Why JSON is Preferred Over XML
- JSON Syntax and Data Types
- Parsing JSON in JavaScript with JSON.parse()
- Converting JavaScript Objects to JSON with JSON.stringify()
Sending JSON Data in AJAX Requests
- Creating JSON Objects and Sending Them in a Request
- Setting Content-Type to application/json
- Handling JSON Responses from the Server
- Example: Sending and Receiving JSON with AJAX
AJAX Example with JSON API
- Making AJAX Requests to REST APIs that Return JSON
- Handling JSON Data on the Client-Side (Displaying JSON data in a Table or List)

What is a REST API?
- Understanding RESTful APIs and their Methods (GET, POST, PUT, DELETE)
- AJAX Requests to Consume REST APIs (GET, POST, PUT, DELETE requests)
- Working with JSON Responses from APIs
- Example: Fetching Data from a Public API (e.g., JSONPlaceholder or OpenWeatherMap API)
Handling API Authentication in AJAX
- Sending Authentication Tokens (Bearer Tokens) in AJAX Requests
- Using API Keys for Authentication
- Example: AJAX Request with Authorization Headers
Cross-Origin Resource Sharing (CORS)
- Understanding CORS in AJAX Requests
- Handling CORS Issues (Using Proxies or JSONP)
- CORS Headers and the Same-Origin Policy

Sending Data to a PHP Server with AJAX
- Handling AJAX Requests in PHP
- Sending Data via GET and POST Methods
- Responding to AJAX Requests from PHP
- Example: Creating a Dynamic Search or Autocomplete Feature with PHP and AJAX
Handling Server Responses in PHP
- Returning JSON Data from PHP to JavaScript
- Returning HTML or XML Data from PHP
- Example: PHP Script that Handles AJAX Requests and Sends Data Back

Setting up a Node.js Server for AJAX Requests
- Using Express.js to Handle AJAX Requests in Node.js
- Handling POST and GET Requests in Express
- Sending JSON Data from Node.js Server to Client
AJAX Request Handling in Node.js
- Handling AJAX POST Requests and Sending Responses
- Using body-parser to Parse Incoming Data in Express
- Example: Simple CRUD Operations with AJAX and Node.js

AJAX in React
- Fetching Data in React Using fetch() or Axios
- Handling API Requests in React Components
- Using React State to Display Data Fetched via AJAX
- Example: Fetching and Displaying Data from a REST API in React
AJAX in Angular
- Using Angular’s HttpClient for AJAX Requests
- Handling HTTP GET and POST Requests in Angular
- Working with Observables and Subscribing to API Responses in Angular
- Example: Fetching Data from an API in Angular
AJAX in Vue.js
- Sending AJAX Requests with Vue.js using Axios or Fetch
- Handling API Calls in Vue Components
- Storing API Response Data in Vue Data Properties
- Example: Displaying Data from an API in Vue.js

Optimizing AJAX Performance
- Minimizing AJAX Requests (Batching Requests, Caching Data)
- Using Lazy Loading for Asynchronous Data
- Optimizing JSON Responses for Speed
AJAX Loading Indicators
- Adding Loading Spinners or Progress Bars while Waiting for Responses
- Displaying “Loading” Status to Improve User Experience
- Example: Showing a Loading Indicator During an AJAX Request
Handling Timeouts and Retries
- Setting Timeouts for AJAX Requests
- Automatically Retrying Failed AJAX Requests
Security Considerations in AJAX
- Preventing Cross-Site Scripting (XSS) in AJAX Responses
- Using CSRF Tokens for AJAX Requests
- Securing Data in Transit (HTTPS)

Using Browser Developer Tools for AJAX Debugging
- Inspecting Network Requests in Chrome DevTools or Firefox Developer Tools
- Debugging AJAX Responses and Errors
- Checking Response Headers and Status Codes
- Viewing the Request and Response Data (JSON, HTML)
Handling Common AJAX Issues
- Dealing with CORS Errors
- Handling 404 or 500 Server Errors
- Debugging JavaScript Errors in AJAX Callbacks