Hi all,
I am implenting a small graphing application. It reads data from a
DB and then displays this in different graph formats e.g.
Bar Chart, Pie Chart, Table, ....
At present I allow the DB table and the X and Y Axis Columns to be
selected from combo boxes. The combo box contents are retrieved
using JSP and stored in the resultant HTML page in JavaScript Arrays.
Thus, a change the table combo populated the X and Y Axis combo's.
When the button to display the chart is clicked a servlet is called.
This servlet then retrieves the X Axis label values and the Y Axis
data values from the DB and graphs it. The graph is displayed
by the servlet using the ServletOutputStream of the response with
the content type set to "image/gif". This means that the browser
goes to the next page and then displays the image.
Is there any way that I could have the image being displayed
underneath the combo boxes ? I would like to avoid using Frames
as they make screens look bad. If I get the servlet to save the
graph to a file is it possible for me to display that image
(<IMG SRC="myGraph.gif">) underneath the combo's ?
When I am doing this I want the location bar to still have the
location of the .jsp file. Is there a mechanism to do this ?
I can use the RequestDispatcher as follows:
HttpSession session = request.getSession(true);
session.putValue("ir",myGraphingBean);
response.setContentType("text/html"); // the jsp page generates html
String path = "/jsp/myGraph.jsp";
RequestDispatcher rd = context.getRequestDispatcher(path);
try {
rd.include(request, response);
} catch (ServletException se) {
System.err.println(" -- ServletException -- \n" +
" Reason: " + se.toString());
} catch (java.io.IOException e) {
System.err.println(" -- IOException -- \n" +
" Reason: " + e.toString());
}
but is there anyway to actually do a redirection to the jsp page instead ?
Should I store the current gif in the actual myGraphingBean and display
this in the jsp page ? Is this possible ?
Thanks for any help,
-John K
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