jasperreport生成pdf_jasperreport 导出excel_jasperreport json(60)

expression, which should always return java.lang.String values.

Hyperlink Expressions

Depending on the current hyperlink type, one or two of the following expressions will be evaluated and

used to build the reference to which the hyperlink element will point:

The JasperReports Ultimate Guide

Page 62

<hyperlinkReferenceExpression>

<hyperlinkAnchorExpression>

<hyperlinkPageExpression>

What is important to know is that the first two should always return java.lang.String and the third

should return java.lang.Integer values.

There is a special sample called hyperlink, provided with the projects, which shows how this type of

report elements can be used.

8.4 Element Groups

Report elements placed in any report section can be arranged in multiple imbricate groups. The only

reason you might have for grouping your elements is to be able to customize the stretch behavior of the

graphic elements, as explained in the section 8.2 Graphic Elements.

The stretchType attribute, available for graphic elements, has among its possible values one called

"RelativeToTallestObject". When choosing this option, the engine will try to identify the object

from the same group with the current graphic element, which suffered the biggest amount of stretch. It

will then adapt the height of the current graphic element to the height of this tallest element of the

group.

But for this to work, you have to group your elements. This is done using the <elementGroup> and

</elementGroup> tags to mark the elements that are part of the same group.

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