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Editorial Team
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Asked: 2026-05-26T22:46:48+00:00

I want to add a default value as javascript for a report parameter so

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I want to add a default value as javascript for a report parameter so I did the following (in the eclipse birt designer):

reportDesignerAddParameter

The problem I have is: when I deploy the app (that contains the report) the javascript is not evaluated:webpageReportParamsJavascriptInDefaultValueNotEvaluated

However, when I preview the report in the birt report designer it evaluates the javascript default value:

birtViewerJavascriptIsEvaluated

Here is the code that I use (filtered to have only the relevant stuff):

  IReportRunnable design = getReportRunnable(pathToTemplate);
  IRunAndRenderTask task = _birtReportEngine.createRunAndRenderTask(design);

  task.setRenderOption(options);
  task.getAppContext().put(EngineConstants.APPCONTEXT_CLASSLOADER_KEY, ReportEngine.class.getClassLoader());

  task.setParameterValues(parameters);
  task.validateParameters();

  task.run();

The question is: did I miss something? Should I add an option somewhere that forces the evaluation of the default javascript expression?

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1 Answer

  1. Editorial Team

    The code you show is the code for creating and rendering a report but it’s not the code for displaying the parameter form.

    Are you using the Birt-Webviewer or a self developed Web App?

    In the latter case and if you retrieve the default parameter values per org.eclipse.birt.report.engine.api.IScalarParameterDefn.getDefaultValue(), the javascript expression will not be evaluated.

    To get default paramater values with expressions evaluated you have to use the engine task IGetParameterDefinitionTask and there the method org.eclipse.birt.report.engine.api.IGetParameterDefinitionTask.getDefaultValue(IParameterDefnBase arg0).

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