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AJAX

Information Technology > Web platform development

Description

AJAX, or Asynchronous JavaScript and XML, is a set of web development techniques used to create interactive web applications. It allows data to be sent and received from a server asynchronously, without interfering with the display and behavior of the existing page. This means you can update parts of a webpage without reloading the whole page. AJAX involves using a combination of HTML and CSS for marking up and styling information, JavaScript to interact with the server and handle responses, and JSON or XML data formats for transferring data. Advanced use of AJAX includes handling errors, working with APIs, security considerations, and performance optimization.

Expected Behaviors

✎
LEVEL 1

Fundamental Awareness

At this level, individuals have a basic understanding of what AJAX is and its purpose. They are familiar with HTTP methods such as GET and POST, and understand the role of XML and JSON data formats in AJAX. However, they may not yet be able to implement AJAX functionality in a practical setting.

🌱
LEVEL 2

Novice

Novices can create simple AJAX requests and understand the readyState property. They know how to handle AJAX responses and understand the difference between asynchronous and synchronous requests. They are beginning to apply their knowledge in practical settings, but may still need guidance.

🌍
LEVEL 3

Intermediate

Intermediate users are proficient in using AJAX with jQuery and can handle errors in AJAX requests. They understand AJAX events and know how to send data with an AJAX request. At this level, individuals can independently implement AJAX functionality in various contexts.

⭐
LEVEL 4

Advanced

Advanced users can use AJAX with different data types and APIs, and understand cross-domain AJAX requests. They also know how to use AJAX with forms. These individuals can solve complex problems using AJAX and can adapt their approach based on specific project requirements.

🏆
LEVEL 5

Expert

Experts have a deep understanding of AJAX, including security considerations and performance optimization. They know advanced AJAX techniques and patterns, and can integrate AJAX with other technologies. Experts can design and implement sophisticated AJAX solutions, and provide guidance to others.

Micro Skills

✎
LEVEL 1

Fundamental Awareness

What is AJAX?
Knowledge of the purpose of AJAX
Familiarity with the basic concept of AJAX
Understanding of how AJAX works
Understanding of GET and POST methods
Familiarity with PUT, DELETE, HEAD, OPTIONS, CONNECT, TRACE methods
Knowledge of when to use each HTTP method
Understanding of the structure of XML data
Understanding of the structure of JSON data
Ability to read and interpret XML and JSON data
🌱
LEVEL 2

Novice

Understanding of the XMLHttpRequest object
Knowledge of how to open an AJAX request
Ability to send an AJAX request
Understanding of how to receive response from an AJAX request
Knowledge of different readyState values
Understanding of how to use the onreadystatechange event
Ability to handle different readyState changes
Understanding of the responseText property
Ability to parse JSON responses
Knowledge of how to handle XML responses
Understanding of the status and statusText properties
Knowledge of the differences between asynchronous and synchronous requests
Understanding of when to use asynchronous vs synchronous requests
Ability to handle asynchronous requests
Knowledge of potential issues with synchronous requests
🌍
LEVEL 3

Intermediate

Knowledge of the syntax of the $.ajax() method
Ability to use the success and error callback functions
Understanding of the async option
Understanding of the syntax of the $.get() and $.post() methods
Ability to handle errors with the $.get() and $.post() methods
Understanding of the ajaxStart() and ajaxStop() methods
Knowledge of the ajaxComplete() and ajaxError() methods
Knowledge of the syntax of the $.getJSON() method
Ability to handle errors with the $.getJSON() method
⭐
LEVEL 4

Advanced

Understanding of how to handle text data
Understanding of how to handle XML data
Understanding of how to handle JSON data
Understanding of how to handle HTML data
Knowledge of how to make API requests with AJAX
Understanding of how to handle API responses
Ability to parse API data for use in a web application
Understanding of API authentication and authorization with AJAX
Knowledge of the same-origin policy
Understanding of CORS (Cross-Origin Resource Sharing)
Ability to make cross-domain requests with JSONP
Understanding of preflighted requests
Ability to submit a form with AJAX
Understanding of how to handle form data in an AJAX request
Ability to validate form data before sending an AJAX request
Understanding of how to handle form submission responses
🏆
LEVEL 5

Expert

Knowledge of the principles of Same Origin Policy
Understanding of Cross-Origin Resource Sharing (CORS)
Understanding of Cross-Site Request Forgery (CSRF) attacks
Ability to implement CSRF protection measures
Understanding of token-based authentication
Ability to implement token-based authentication in AJAX
Knowledge of the risks associated with unsanitized input
Ability to sanitize input data in AJAX
AJAX with OAuth and Authentication
Modern AJAX Techniques

Skill Overview

  • Expert2 years experience
  • Micro-skills60
  • Roles requiring skill3

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