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Persisting Parameter Value throughout report

bgbaird

I have a requirement to manage the y axis scale on a bar chart dynamically based on external data.
 
Currently:
I set the parameter value default (ie 50).
params["myParam"].value == 50
Execute a dataset using a table.
In that dataset, I set the parameter value based on stuff (ie 75).
params["myParam"].value ==75
 
After this, I have a bar chart.
 
In beforeDataSetFilled,
I set "gblscale" = icsc.getExternalContext().getScriptable().getParameterValue("myParam").
 
In beforeGeneration,
I set yscale.setMax( NumberDataElementImpl.create(gblscale) )
 
The Y Scale resolves to the default parameter value of 50. I want it to be 75.
 I'm working in 3.2.22
 
Thanks, Brian

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Comments

mwilliams

Have you tried using a PersistentGlobalVariable vs using a Parameter?

bgbaird

That worked. I had been running into an issue with the variable type, but figured it out.T
 
Thanks, Brian

bgbaird

On second thought, it didn't work. I'm having an issue getting a changed global variable into the chart script. It always seems to take the initial value of the variable.
 
I set the value in the report initialize:
reportContext.setPersistentGlobalVariable("maxRocCount",new Number(88));
 
I reset the value (I've tried multiple events before the chart execution):
reportContext.setPersistentGlobalVariable("maxRocCount",new Number(99));
 
In the chart, i always get the initial value of 88:
 
var gblscale = new Number(22)
 
 
function beforeDataSetFilled( series, idsp, icsc )
 {
 gblscale = icsc.getExternalContext().getScriptable().getPersistentGlobalVariable("maxRocCount");
 }
 
function beforeGeneration( chart, context ) 
 { 
 chart.setUnitSpacing(50); 
 importPackage( Packages.org.eclipse.birt.chart.model.data.impl ); 
 xAxis = chart.getBaseAxes()[0]; 
 yAxis = chart.getOrthogonalAxes( xAxis, true)[0] 
 yscale = yAxis.getScale(); 
 yscale.setStep (10); 
 yscale.setMin( NumberDataElementImpl.create(0) ) 
 yscale.setMax( NumberDataElementImpl.create(gblscale) ) 
 yAxis.setScale(yscale); 
 }

mwilliams

Here are the changes I made in your report that worked for me using PGVs.
 
Computed Column:
 
<div><pre class="_prettyXprint _linenums:0">reportContext.setPersistentGlobalVariable("myParam","75");

123;</pre></div>
 
BeforeDataSetFilled:
 
<pre class="_prettyXprint _linenums:0">gblscale = parseInt(icsc.getExternalContext().getScriptable().getPersistentGlobalVariable("myParam"));</pre>

bgbaird

Cool, that did it. I had issues with the string to integer issue I think.;