iReport Ultimate Guide - Nimsoft Library
iReport Ultimate Guide - Nimsoft Library iReport Ultimate Guide - Nimsoft Library
iReport Ultimate GuideVariables are the only objects for which a scriptlet can change the value. Pay attention to the fact that when a scriptlet sets avalue for a variable, it could be in concurrence with the reporting engine (in general when a calculation type has been set forthe variable). For this reason, variables that are supposed to be used by a scriptlet should always have System as calculationtype.Being able to access the report objects, not just their value, is a great advantage, especially when a scriptlet is thought to bereusable (since you can identify, for instance, a parameter or field having a certain custom property). In particular, theJRFillParameter and JRFillField provide a way to read the their properties set at design time, and both JRFillFieldand JRFillVariable expose the previous value, which is useful for differential calculations.18.5 Debugging a ScriptletUnfortunately, there is no way to run a step-by-step debugger to debug a scriptlet by setting breakpoints in the code, but thereare several techniques to monitor the scriptlet execution. One of them is using a simple System.out.println() toprint informations that will appear in the iReport output console. It is good practice to follow the println call with a flush tobe sure the printed message is shown as soon as possible in the output view. Here is an example:public void beforePageInit() throws JRScriptletException {pageInitTime = new java.util.Date().getTime();}System.out.println("I have set the pageInitTime to: " + pageInitTime);System.out.flush();340
ScriptletsThis is what you get in the output console:Figure 18-9Debug messages coming from the scriptletA more sophisticated scriptlet (suitable only in a design environment) can pop up a dialog displaying information such as thecurrent status of the fields and an option to stop the execution, as shown in Figure 18-10.341
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- Page 295 and 296: Lists, Tables, and BarcodesFigure 1
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- Page 299 and 300: SubdatasetsCHAPTER 15 SUBDATASETSRe
- Page 301 and 302: SubdatasetsUR permits you to use a
- Page 303 and 304: SubdatasetsFigure 15-7Initial layou
- Page 305 and 306: SubdatasetsFigure 15-11 Pie dataset
- Page 307 and 308: CrosstabsCHAPTER 16 CROSSTABSA cros
- Page 309 and 310: CrosstabsUsing the Crosstab Wizard,
- Page 311 and 312: CrosstabsFigure 16-6Outline tree vi
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- Page 319 and 320: CrosstabsFigure 16-19 Crosstab Data
- Page 321 and 322: CrosstabsFigure 16-22 The result of
- Page 323 and 324: InternationalizationCHAPTER 17 INTE
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- Page 331 and 332: ScriptletsCHAPTER 18 SCRIPTLETSA sc
- Page 333 and 334: ScriptletsTable 18-1Report eventsEv
- Page 335 and 336: ScriptletsFigure 18-3Adding a Jar t
- Page 337 and 338: ScriptletsFigure 18-5Build output18
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- Page 345 and 346: Additional ToolsCHAPTER 19 ADDITION
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- Page 351 and 352: 19.5 How to Run the SamplesAddition
- Page 353 and 354: Chart Theme ExampleAPPENDIX ACHART
- Page 355 and 356: Chart Theme ExampleCode Example A-1
- Page 357 and 358: IndexINDEXAAdd selected field(s) 20
- Page 359 and 360: Indexcomponents 241embedded in Java
- Page 361 and 362: Indexscriptlets 53sheets. See prope
ScriptletsThis is what you get in the output console:Figure 18-9Debug messages coming from the scriptletA more sophisticated scriptlet (suitable only in a design environment) can pop up a dialog displaying information such as thecurrent status of the fields and an option to stop the execution, as shown in Figure 18-10.341