Set report parameters (default) value dynamically

I would like to set report parameters (default) value dynamically but without repeating code in scripts (if I use script for dataSet I have to repeat code for each dataSet; if I use expression for default parameter value I have to repeat similar parts of code for each parameter). 
Is there way how to set report parameters value from "one place"? 
I tried to use BeforeFactory. It works for report variables but not for parameters (it was not set). I tried a code like the following:
 
@Override 
public void beforeRender(IReportContext reportContext) throws ScriptException { 
 ... // preparing value lastDayOfThisMonth for report param 
 
 reportContext.setParameterValue("lastDayInThisMonth", lastDayOfThisMonth); 
}
 
Why the parameter value is not set?
 
Thank you

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Comments

Matthew L.

I'm not sure if this is exactly what your looking for, however to set the value that will "Appear" in the parameter page, you must define the value before the report initialize method.
 
While this can be done in a few ways, the easiest way I think is to set the parameter values in the parameter's getDefaultValueList method.
From my observations, this is the first method to execute in the order of operations.
 
However since you want to define all parameters from one location, you can still accomplish this is the first parameter's getDefaultValueList by calling the handles of the other parameters, and setting their default values.
Depending on your engine build, slight modifications may be necessary, however I've attached an example of this process.
 
Also, if you are wanting to dynamically set these values based on data from a data set.
You can use the code from the following example to query a data set from the parameter's getDefaultValueList method: <a data-ipb='nomediaparse' href='http://developer.actuate.com/community/forum/index.php?/topic/35930-running-a-query-in-the-initalize/?p=133369'>http://developer.actuate.com/community/forum/index.php?/topic/35930-running-a-query-in-the-initalize/?p=133369</a>
 
The code used in the first parameter's getDefaultValueList method is:
<pre class="_prettyXprint _lang-js">
var param1 = reportContext.getDesignHandle().findParameter("Parameter 1"); //Get parameter 1
param1.setDefaultValue("Parameter 1 Has A New Value"); //Set its default value

var param2 = reportContext.getDesignHandle().findParameter("Parameter 2"); //Get parameter 2
param2.setDefaultValue("Parameter 2 Can Also Have A New Value"); //Set its default value

param1.getDefaultValueList()[0]; //Return parameter 1 default value

</pre>

p.K

Thank you, it could be the solution. 
Note: 
On the last line, there is a value which is returned as default value of the first parameter (or another parameter where is this script). It seemed to me that it does not work but then I found that getDefaultValueList()[0] (and getDefaultValue()) returns String and my parameter data type is Integer. It caused that the default value was NULL. So I changed it:
<pre class="_prettyXprint">
parseInt(thisYearParam.getDefaultValue()); </pre>
and now the value is as I expect. 
Maybe it can help somebody.