0 Replies Latest reply on Jun 23, 2011 1:16 PM by Benniu Ji

    problem to use mediaOutPut to show a JFreeChart

    Benniu Ji Newbie

      This question is both related to Seam and Richfaces. I'm not sure which fourm should I post this question on so I just posted on both.

       

      I'm using Seam 3 and Richifaces 4

       

      I have on page named 'report.jsf'. It has a parameter 'id'.

      The url is like:   report.jsf?id=123

       

       

      On the page, there is a view action

       

      <s:viewAction action="reportManager.loadReport" />

       

       

      This method will fetch report from DB according to the id.

      Also on this page, I used

       

      <a4j:mediaOutput element="img" cacheable="false" session="false"

       

       

                       createContent="#{reportManger.paint}" value="#{mediaData}"

       

       

                       mimeType="image/jpeg" />

       

       

      to display a JFreeChart. The paint method will dynamically create a chart according to the report info got from DB.

       

       

      In loadReport method it will get data from DB which will be used by paint method.

       

       

      Here is the problem:

       

       

      The report page displays the report info correctly but the chart does not. The chart is always empty.

       

       

      I guess reportManager.paint is called before loadReport fetches the data to generate the chart.

       

       

      How to lodaReport firstly and then paint the chart?

       

       

      Can anyone show me an example which uses a view action to load data and dynamically generate a JFreechart and display in medialOutPut?