Apex changing nulls to zeroes when creating Flash Charts

Question

Hey all,
Apex appears to be changing Null's to Zeroes when generating the XML to fuel a graph. I want to chart this year's output by month against last year's output by month. As this year is not complete, the two lines should be different lengths. When I view the XML, Apex is "filling in" the vacant (future) months with zeroes. This causes the line for this year to continue by dropping to zero for the rest of the year. I have already tried to adjust this by changing the maximum rows for this year's series.
Any help would be greatly appreciated. Marco, this seems to be up your alley.
Thanks.
Paul

Answer 1

Paul,
The best place to put it is an Application Process.
1) Go to Shared Components and create an Application Process (say it's named MY_CHART_XML_PROCESS). The PL/SQL for the Application Process should follow this general outline, substituting your own XML-generating logic for {my chart XML}:
owa_util.mime_header( ccontent_type => 'text/xml', bclose_header => TRUE, ccharset => 'utf-8');
htp.p('{my chart XML}');2) Replace both occurences of "FLOW_FLASH_CHART_R#REGION_ID#" with "APPLICATION_PROCESS=MY_CHART_XML_PROCESS" in the region source for the chart that is to use this XML.
That should do it.
- Marco