AJAX

Asynchronous Javascript and XML
1. Is combination of technologies that allows content of a web page to be updated or changed without the entire page being re loaded.
2. AJAX can be implemented in Browsers that do not support XMLHTTPRequest object. possible using remote scripts.
3. AJAX technology is independant of web servers. AJAX is client Technology.
4. AJAX is supported in IE 5 and above, Netscape, Opera, safari, Firefox
5. responseText and responseXML are properties
6. overrideMimeType(), setRequestHeader(), getResponseHeader() are the methods
7. ASP.NET Ajax is a free framework for quickly creating efficient and interactive web applications that word across all popular browsers
8. AJAX Control toolkit can be downloaded for ASP.NET 2.0. But is a part of ASP.NET 3.5 framework
9. Version 1.0.20229 for .NET 1.0 and 2.0
10. Version 3.5.20229 for .NET 3.5
11. Dojo is modular open source Javascript toolkit designed to ease the rapid development of AJAX based applications
12. Multiple AJAX requests can be made by creating multiple XMLHHTTPRequest objects.
13. ScriptManager is a server side control that sits on your web form and enables core of ASP.NET AJAX.
14. Its primary role is the arbitration of all other ASP.NET AJAX controls on the web form and addition of the right scripting libraries to the web browser so that client portion of ASP.NET AJAX can function
a. Managing all resources on a web page
b. Managing partial page updates
c. Download AJAX script library to the client
d. Interacting with UpdatePanel and UpdateProgress controls
e. Register script (Using RegisterClientScriptBlock)
f. Providig access to web service methods by registering web services with the ScriptManager control.
g. Providing access to ASP.NET Authentication, role and profile application services from client script after registering these from ScriptManager control.
h. Enable culture specific display of client side script.
i. Register server controls that implement IExtenderControl and IScriptControl interfaces
15. Multiple ScriptManager controls cannot be used in a web page