Ajax refers to asynchronous java script and xml. It is not a not a programming language. Ajax is of Asynchronous type. It normally uses XML, plain text or JSON to communicate with server i.e. for data transfer.
Note: Ajax is technology independent.
As we discussed in previous tutorial that XMLHttpRequest object is used for communication between client and server.
The open() and send() methods of the XMLHttpRequest object are used to send a request to a server.
| Method | Description |
| open(method,url,async,user,psw) | It specifies the request. Where: method: the request type GET or POST url: the file location async: true (asynchronous) or false (synchronous) user: optional user name psw: optional password |
| send() | It sends the request to the server. It is used for GET requests |
| send(string) | It sends the request to the server. It is used for POST requests |
Example:
xhttp.open("GET", "test.txt", true);
xhttp.send();
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