The XMLHttpRequest object is used for asynchronous communication between client and server. It provides the facility to update the web page content without reloading the whole page.
How to create an xmlhttprequest object
Var variable = new XMLHttpRequest();
Ajax XMLHttpRequest Object Methods
| Method | Description |
| new XMLHttpRequest() | It creates a new XMLHttpRequest object. |
| abort() | It cancels the current request. |
| getAllResponseHeaders() | It returns header information. |
| getResponseHeader() | It returns specific header information. |
| 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 |
| setRequestHeader() | It adds a label or value pair to the header to be sent |
Ajax XMLHttpRequest Object Properties
| Property | Description |
| onreadystatechange | It defines a function to be called when the readyState property changes |
| readyState | It holds the status of the XMLHttpRequest. XMLHttpRequest Status: |
| responseText | It returns the response data as a string. |
| responseXML | It returns the response data as XML data. |
| status | It returns the status-number of a request. For example: 200: “OK” 403: “Forbidden” 404: “Not Found” |
| statusText | It returns the status-text (For example “OK” or “Not Found”). |
