jasperreport生成pdf_jasperreport 导出excel_jasperreport json(36)

rectangle, you should expect to see it displayed only once, at the beginning of the report and then

ignored until the end of the report.

The isPrintRepeatedValues attribute works only if the corresponding

<printWhenExpression> is missing. If this is not missing, it will always dictate if the

element should be printed or not, regardless of the repeating values.

If you decide to not display the repeating values for some of your report elements, you have the

possibility to soften or refine this behavior, by indicating the exceptional occasions to which you might

want to have a particular value redisplayed, during the report generation process.

When the repeating value spans on multiple pages or columns, you have the possibility to redisplay this

repeating value at least once for every page or column.

By setting isPrintInFirstWholeBand="true", you make sure that the report element will

reappear in the first band of a new page or column that is not an overflow from a previous page or

column.

Also, if the repeating value you have suppressed spans on multiple groups, you have the possibility to

make it reappearing at the beginning of a certain report group, is you specify the name of that particular

group in the printWhenGroupChanges attribute.

Removing Blank Space

When report elements are not displayed for some reason: <printWhenExpression> evaluated to

Boolean.FALSE, or repeated value being suppressed, a blank space remains where that report element

would have stood.

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