Using Global Variables

Hi Gang,

I'm displaying a set of data rows grouped by a field called TYPE, the group footer is displaying the count of records for that particular group. I have a condition where some of the data rows are visible but some are not and I want the footer to reflect the records that are visible.

So there might be 10 data rows that are returned, but I only want 5 to appear and I want the total count to say 5 not 10.

Are global variables available in BIRT where I can use a running count of the rows that are visible and use that in the footer? If so, would I do my calcuations in a Data control?

thanks,
John

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Comments

bhanley

You can use a Global Persistent Variable in order to track data across different elements of the report. Using this should allow you to track anything you need throughout the report's lifecycle. 
 
Inside a scripting event handler, use the following: 
 
<pre class='_prettyXprint _lang-auto _linenums:0'>
reportContext.setPersistentGlobalVariable("var_name", value);
reportContext.getPersistentGlobalVariable("var_name");
</pre>
 
There are a number of posts and DevShare items detailing this feature to help you further.

mwilliams

Hi John,

If you declare a variable in the report initialize script like rowCount = 0, you can increment this variable in your visibility expression you have on your row in the condition that you don't hide the row. Then you can call this variable in a report element of your choice in your footer.

jballnik

Great...I got it to work. Thanks for all your help!!