Hi everybody,
i have a requirement to pass the value of a javascript
variable to a servlet. i have the following javascript
function in a html page.
<html>
<head>
<SCRIPT LANGUAGE = "Javascript">
function javascriptFunction ( ) {
y="html page";
}
</SCRIPT>
</head>
i want this function to be executed as soon as the html
page is viewed. hence i have put the following in the html :
<BODY onLoad = "javascriptFunction ( ) ">
after the above function has been executed, i want a servlet to be
executed at the server and i want to pass the value contained in the
variable y of the javascript function to the servlet. and i want the
servlet to be executed automatically without any user intervention. the
servlet gets executed at the server end, but i am unable to pass the
value of the variable y in the javascript function. is this code in the
html page to pass the parameter ok ?
<img src =
"http://202.201.134.78:8080/servlet/image?b="+javascript:javascriptFunction(
).y
width = 1 height = 1>
i am doing nothing in the servlet except String strTemp =
req.getParameter ("b") and then writing back an 1 x 1 image.
strTemp
just prints blanks. following is the servlet code.
import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class ImageServlet extends HttpServlet {
public void doGet (HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException {
String strTemp = req.getParameter ("b");
System.out.println ("parameter b : " + strTemp );
res.setContentType ("image/gif");
res.setHeader( "Pragma", "no-cache" );
res.setHeader( "Cache-Control","no-cache" );
res.setHeader( "Cache-Control","no-store" );
res.setDateHeader( "Expires", 0 );
FileInputStream bTemp = new FileInputStream
("c:/javeed/servlets/images/temp.gif");
int iLength = bTemp.available ();
byte[] byteArray = new byte [iLength];
for (int b=0; b< iLength; b++) {
byteArray [b] = (byte) bTemp.read ();
}
bTemp.close ();
ServletOutputStream out = res.getOutputStream ();
out.write (byteArray);
out.flush ();
out.close();
}
}
Thanks and Regards,
Javed
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