Code:
<Script language = "JavaScript">
Xml = new activexobject ("Microsoft. XMLHTTP ");
VaR post = ""; // construct the data to carry
XML. open ("Post", "http: // localhost: 7001/testwl/index. JSP ", false); // use the POST method to open a connection to the server and communicate asynchronously.
XML. setRequestHeader ("Content-Length", post. Length );
XML. setRequestHeader ("Content-Type", "application/X-WWW-form-urlencoded ");
XML. Send (post); // send data
VaR res = xml. responsetext; // receives data from the server
Document. Write (RES );
</SCRIPT>
Suddenly, this code is used to open an HTTP connection and pass data in standard HTTP format. If you like it, you can use XML format to transfer data. You can change the XML Object Construction Method to be compatible with Mozilla and Netscape. Next, we will write a round robin to refresh the user list every time. Of course, we do not need to refresh the page:
Code:
<HTML>
<Head> <title> detector </title>
<Script language = "JavaScript">
Function detect ()
{
Xml = new activexobject ("Microsoft. XMLHTTP ");
VaR post = ""; // construct the data to carry
XML. open ("Post", "http: // localhost: 7001/testwl/index. JSP ", false); // use the POST method to open a connection to the server and communicate asynchronously.
XML. setRequestHeader ("Content-Length", post. Length );
XML. setRequestHeader ("Content-Type", "application/X-WWW-form-urlencoded ");
XML. Send (post); // send data
VaR res = xml. responsetext; // receives data from the server
List. innertext = res;
SetTimeout ("detect ()", 5000); // Round Robin every 5 seconds
}
</SCRIPT>
<Body onload = "detect ()">
<A id = "list"> </a>
</Body>
</Html>
This communication method has a small amount of data, so you don't have to re-transmit the entire page. It takes five seconds to go round, so that normal PCs can withstand a large number of online messages. Constructing a detector to listen to online lists and messages has a very good effect. Even if your customers sit in front of the computer and do not touch the mouse, they can ensure real-time data transmission, page does not jump or refresh.
Session listening and XMLHTTP communication make it easy to develop a well-developed intra-site messaging system. '
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