Hello !
I think that You should rather try like to make a global variable in
JavaScript
like this:
<SCRIPT LANGUAGE = "JavaScript">
var y=""; //this will be a global variable
function javascriptFunction ( ) {
y="html page";
}
</SCRIPT>
Than instead of img src tag try :
<SCRIPT LANGUAGE = "JavaScript">
document.write("<img src='http://202.201.134.78:8080/servlet/image?b="+y+" '
width = 1 height = 1>");
</SCRIPT>
Note the '
I think this should work.
Please send a reply if something is wrong.
Best wishes,
Andras.
-----Original Message-----
From: Javeed Akthar <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED] <[EMAIL PROTECTED]>
Date: Monday, June 14, 1999 8:32 AM
Subject: Passing value of a javascript variable to a servlet
>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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