I'm trying to get a servlet to use a routine in an
exteral javascript .js file. So far, I haven't been
able to figure out how to 'knit' everything together so
the routine is resolved.
Below are two **very** simple java servlet programs,
JsStep1.java and JsStep2.java. There is also a file,
external.js with a simple routine, externalhello() that
puts up an alert box to indicate it was reached.
I'm using TomCat 3.2.1 with Win-2000 SP1 and Ie5.5 Sp1.
The .java and .class files are in
h:\Jakarta\webapps\ari\WEB-INF\classes
JsStep1 invokes an internal javascript routine,
internalhello(). This works fine, and the alert box
shows up.
JsStep2 attempts to invoke an external javascript
routine, externalhello(), and crashes. TomCat reports
an error,
Ctx( /ari ): 404 R( /ari + /servlet/external.js + null)
null
I also get an runtime error message:
Line: 11
Error: Object expected
These are the same symptons/messages I got before I had
put external.js anywhere, which makes me think that
Tomcat can't find the file.
When I save the source as JsStep2.html, it works fine in
a browser; in that it can reach external.js and put up
the alert box.
I'm stumped ... what am I doing wrong? My guess is that
I don't have the external.js file in the correct
directory, but I've tried invoking JsStep2 with
external.js in 14 different directories ... any
directory that seemed to make any sense. I've tried
different capitalizations, with and
without "javascript:" prefix. Is there something I
should put in the web.xml file?
Below are the three files.
********* JsStep1
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class JsStep1 extends HttpServlet {
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws IOException,
ServletException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("<html>");
out.println("<head>");
out.println("<title>JsStep1-d</title>");
out.println("<script language=\"javascript\">");
out.println("function internalhello() {");
out.println(" alert(\"Reached
internalhello\");");
out.println("}");
out.println("</script>");
out.println("</head>");
out.println("<body bgcolor=blue>");
out.println("<h1>JsStep1-d</h1>");
out.println("Test_1: <input name=\"test_1\"
type=\"text\" ");
out.println(" onchange=\"javascript:internalhello
();\">");
out.println("Test_2: <input name=\"test_2\"
type=\"text\" ");
out.println(" onchange=\"internalhello();\">");
out.println("</body>");
out.println("</html>");
}
}
******** JsStep2 *************
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class JsStep2 extends HttpServlet {
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws IOException,
ServletException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("<html>");
out.println("<head>");
out.println("<title>JsStep2-d</title>");
out.println("<script language=\"javascript\"
src=\"external.js\">");
out.println("</script>");
out.println("</head>");
out.println("<body bgcolor=blue>");
out.println("<h1>JsStep2-d</h1>");
out.println("Test_1: <input name=\"test_1\"
type=\"text\" ");
out.println(" onchange=\"javascript:externalhello
();\">");
out.println("Test_2: <input name=\"test_2\"
type=\"text\" ");
out.println(" onchange=\"externalhello();\">");
out.println("</body>");
out.println("</html>");
}
}
******** external.js ********
function externalhello() {
alert ("Reached externalhello");
}
