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JSP + Ajax auto-Refresh instance

Source: Internet
Author: User
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I. jsp file: auto. jsp
<% @ Page contenttype = "text/html; charset = gb2312" %>

<%
// Set the format and Character Set of output information
Response. setcontenttype ("text/XML; charset = UTF-8 ");
Response. setheader ("cache-control", "No-Cache ");
Out. println ("<response> ");

For (INT I = 0; I <2; I ++ ){
Out. println ("<Name>" + (INT) (math. Random () * 10) + "notebook </Name> ");
Out. println ("<count>" + (INT) (math. Random () * 100) + "</count> ");
}
Out. println ("</response> ");
Out. Close ();

%>

 

 
Ii. html file: autorefresh.html
<Head>
<Meta http-equiv = Content-Type content = "text/html; charset = gb2312">
</Head>
<Script language = "JavaScript">
VaR xmlhttpreq;
// Create an XMLHTTPRequest object
Function createxmlhttprequest (){
If (window. XMLHttpRequest) {// Mozilla Browser
Xmlhttpreq = new XMLHttpRequest ();
}
Else if (window. activexobject) {// IE browser
Try {
Xmlhttpreq = new activexobject ("msxml2.xmlhttp ");
} Catch (e ){
Try {
Xmlhttpreq = new activexobject ("Microsoft. XMLHTTP ");
} Catch (e ){}
}
}
}
// Send the request Function
Function sendrequest (){
Createxmlhttprequest ();
VaR url = "auto. jsp ";
Xmlhttpreq. Open ("get", URL, true );
Xmlhttpreq. onreadystatechange = processresponse; // specify the response function.
Xmlhttpreq. Send (null); // send the request
}
// Function for processing returned information
Function processresponse (){
If (xmlhttpreq. readystate = 4) {// judge the object status
If (xmlhttpreq. Status = 200) {// The information has been returned successfully. Start to process the information.
Displayhot ();
SetTimeout ("sendrequest ()", 1000 );
} Else {// The page is abnormal.
Window. Alert ("the page you requested has an exception. ");
}
}
}
Function displayhot (){
VaR name = xmlhttpreq. responsexml. getelementsbytagname ("name") [0]. firstchild. nodevalue;
VaR COUNT = xmlhttpreq. responsexml. getelementsbytagname ("count") [0]. firstchild. nodevalue;
Document. getelementbyid ("product"). innerhtml = Name;
Document. getelementbyid ("count"). innerhtml = count;
}

</SCRIPT>

<Body onload = sendrequest ()>
<Table Style = "border-collapse: collapse" bordercolor = #111111
Cellspacing = 0 cellpadding = 0 width = 200 bgcolor = # f5efe7 border = 0>
<Tr>
<TD align = Middle Height = 4 colspan = "2"> Src = "images/promo_list_top.gif" width = "100%"
Border = 0>
</TD>
</Tr>
<Tr>
<TD align = middle bgcolor = # dbc2b0
Height = 19 colspan = "2"> <B> Hot notebook </B>
</TD>
</Tr>
<Tr>
<TD Height = "20">
Model:
</TD>
<TD Height = "20" id = "product">
</TD>
</Tr>
<Tr>
<TD Height = "20">
Sales quantity:
</TD>
<TD Height = "20" id = "count">
</TD>
</Tr>
</Body>
</Table>

 

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Related Keywords:
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