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How to dynamically change the legend in a chart?

sgruendel

Hi,

I have a chart with two Y axes and an Y series grouping. Now I get two sets of legends with the same colours, one for each Y axis I suppose. How can I change it so there is only one set of legends.

Or can I use some some JavaScipt code to dynamically change the elements in the legend at runtime?

Many thanks in advance, Stefan

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Virgil Dodson

Hi Stefan, 
 
You can try writing some script into the beforeDrawLegendItem method. 
 
Read more here: 
<a class='bbc_url' href='http://www.birt-exchange.com/documentation/BIRT_220/ChartJavadoc/chart/api/org/eclipse/birt/chart/script/IChartEventHandler.html'>http://www.birt-exchange.com/documentation/BIRT_220/ChartJavadoc/chart/api/org/eclipse/birt/chart/script/IChartEventHandler.html</a> 
 
I'm not sure if this will do what you want. I personally have used it to change legend colors only like below... so I suppose you could use some transparency properties. 
 
function beforeDrawLegendItem(lerh, bounds, icsc) 
{ 
lerh.getFill().set(255, 0, 0); 
}

sgruendel

Hi Virgil, 
 
<blockquote class='ipsBlockquote' data-author="vdodson">Hi Stefan, 
 
You can try writing some script into the beforeDrawLegendItem method. 
 
Read more here: 
<a class='bbc_url' href='http://www.birt-exchange.com/documentation/BIRT_220/ChartJavadoc/chart/api/org/eclipse/birt/chart/script/IChartEventHandler.html'>http://www.birt-exchange.com/documentation/BIRT_220/ChartJavadoc/chart/api/org/eclipse/birt/chart/script/IChartEventHandler.html</a> </blockquote>
 
great, that does the trick. I simply do lerh.getLabel().setVisible(false); to hide the text, and lerh.getFill().setTransparency(0); to hide the square. 
 
Many thanks for your help, Virgil! 
 
 
Kind regards, Stefan

Chris605

<blockquote class='ipsBlockquote' data-author="'sgruendel'" data-cid="29680" data-time="1200909916" data-date="21 January 2008 - 03:05 AM">
Hi Virgil, 
 
 
 
 
great, that does the trick. I simply do lerh.getLabel().setVisible(false); to hide the text, and lerh.getFill().setTransparency(0); to hide the square. 
 
 
Many thanks for your help, Virgil! 
 
 
 
Kind regards, Stefan </blockquote>
 
Hi Stefan, 
its an old post, but I hope you'll read it, or perhaps someone else. I have the same problem. I've a chart with two Y-Axis and one series each. I need to group by one of theese series. But now appear in the legend two times the same entries. 
The first Y-axis has a square as marker, the seconde no symbol as marker. When i use the two lines of code you mentioned I still kann see the outline of the square marker and the line of second axis (see attached file). But i don't want to hide the legend entries for Y-Axis 1. There should appear the entries from grouping and for Y-Axis 2 should appear only one Entry named "Standard". 
 
Anyone any ideas? 
 
Regards, Chris