Ajax Send Request to a Server
To send a request to a server, we use the open() and send() methods of the XMLHttpRequest object:
xmlhttp.open("GET","filename.php",true);
xmlhttp.send(null);
xmlhttp.send(null);
| Method | Description |
| open( method,url,async ) | Specifies the type of request, the URL, and if the request should be handled asynchronously or not. method : the type of request: GET or POST url : the location of the file on the server async : true (asynchronous) or false (synchronous) |
| send( string ) | Sends the request off to the server. string : Only used for POST requests |
GET or POST?
POST is simpler and slower than GET, but Get is ideal for ajax and can be used in most cases.
However, always use POST requests when:
- Sending a large amount of data to the server (POST has no size limitations)
- Sending user input (which can contain unknown characters), POST is more secure than GET