10. AJAX - current issues

AJAX is growing very fast and that is the reason that it contains many issues with it. We hope with the passes of time they will be resolved ab AJAX will be ideal for web applications. We are listing down few issues which AJAX has as a challenge.
Complexity is increased

• Server side developers will need to understand that presentation logic will be required in the HTML client pages as well as in the server-side logic
  
• Page developers must have JavaScript technology skills
  

AJAX-based applications can be difficult to debug, test, and maintain

• JavaScript is hard to test - automatic testing is hard
  
• Weak modularity in JavaScript
  
• Lack of design patterns or best practice guidelines yet
  

Toolkits/Frameworks are not mature yet

• Most of them are in beta phase
  

No standardization of the XMLHttpRequest yet

• Future version of IE will address this
  

No support of XMLHttpRequest in old browsers

• Iframe will help
  

JavaScript technology dependency & incompatibility

• Must be enabled for applications to function
  
• Still some browser incompatibilities
  

JavaScript code is visible to a hacker

• Poorly designed JavaScript code can invite security problem