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Change pie chart label with multiple values

kclarkkclark BIRT GuruEM
edited November 1, 2013 in DevShare
Sometimes you need to change the label in a pie chart, this can easily be done<br />
in the beforeDrawDataPointLabel(). What if you've also included value data with<br />
the category data in the label? By the time you get the label value in<br />
beforeDrawDataPointLabel() BIRT has put all the label information in the same<br />
string. This example shows how you can change the category data in your label<br />
without overwriting the rest of the string. It can be done with the following<br />
code.<br />
function beforeDrawDataPointLabel( dph, label, icsc )
{
  var entireLabel = label.getCaption().getValue();
  var firstValue;
  var secondValue = " United States";
   
  if(BirtStr.search("USA", entireLabel) &gt; 0) {
    var endPosition = BirtStr.search("USA", entireLabel) - 1;
     
    firstValue = BirtStr.left(entireLabel, endPosition);
     
    label.getCaption().setValue(firstValue + secondValue);
  }
}
<br />
<br />
BirtStr.search() looks to see if the given value is in the string and <br />
returns the starting position. If the string is not found -1 is returned.<br />
<br />
Since BirtStr.search() tells me where the string is located and I know that<br />
it's the last value I can use this to tell me where the end of the value data<br />
is located and store it in endPosition.<br />
<br />
Then I can use BirtStr.left() to store everything from the left most value to<br />
endPosition and finally change the label with<br />
<br />
label.getCaption().setValue(firstValue + secondValue);

Kristopher Clark

Actuate Corporation – The BIRT Company™

http://www.actuate.com | http://birtondemand.com

 

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