relationship between ajax, dojo,dwr, json

[Rauhl Roy]

May I know ajax can be replaced with Dojo or Dwr or JSON technologies.

why we need all of them to use ajax? may i know the relationship between all these technologies?

[Bear Bibeault]

Rauhl Roy wrote:May I know ajax can be replaced with Dojo or Dwr or JSON technologies.

No.

why we need all of them to use ajax?

You don't.

may i know the relationship between all these technologies?

Dojo is a general purpose JavaScript library

DWR is a JavaScript library for doing web remoting

JSON is a serialization format for JavaScript constructs

All are well-documented on the web, including in Wikipedia.