Jasper Reports：一个记录中的y页x [英] Jasper Reports: page x of y within one record

问题描述

我有多条记录的报告，其中一条记录由1-5页组成。如何显示y的页面x ，其中 x 是实际记录的页数和 y 是实际记录的总页数？我有类似下面的 x 变量（在新记录上重置，按页面递增），但它不起作用（在每页x上有1个值）：

I have report with multiple records, where one record is consisting of 1-5 pages. How to display "page x of y", where x is a number of page for actual record and y is total pages for actual record ? I have something like below for x variable (reset on new record, incremet by page), but it doesn't work (on each page x have 1 value):

<variable name="x" class="java.lang.Integer" resetType="Group" resetGroup="report_count" incrementType="Page" calculation="Count">
    <variableExpression><![CDATA[1]]></variableExpression>
    <initialValueExpression><![CDATA[new Integer(1)]]></initialValueExpression>
</variable>

<!-- group by record -->
<group name="report_count" isStartNewPage="true">
    <groupExpression><![CDATA[$V{REPORT_COUNT}]]></groupExpression>
</group>

<textField evaluationTime="Now" evaluationGroup="report_count">
    <reportElement x="141" y="5" width="156" height="20"/>
    <textElement textAlignment="Right"/>
    <textFieldExpression><![CDATA["Page "+$V{x}+" of"]]></textFieldExpression>
</textField>

推荐答案

问题是计算=count没有达到预期的效果。它返回 variableExpression 返回的非空值的计数。由于您的 variableExpression 仅返回单个值，因此该变量始终设置为1.

The problem is that calculation="count" does not do what you are expecting it to. It returns the count of non-null values that your variableExpression returns. As your variableExpression only returns a single value, the variable is always set to 1.

一个简单的解决方案是将计算类型设置为Nothing，并将variableExpression设置为 $ V {x} +1

An easy solution is to set the calculation type to "Nothing", and the variableExpression to $V{x}+1

ie：

<variable name="x" class="java.lang.Integer" resetType="Group" resetGroup="report_count" incrementType="Page" calculation="Nothing">
    <variableExpression><![CDATA[$V{x} + 1]]></variableExpression>
    <initialValueExpression><![CDATA[new Integer(1)]]></initialValueExpression>
</variable>

---

组标记可以具有属性 isResetPageNumber 。设置为true时，它将在每个组的开头重置内置变量 PAGE_NUMBER 。由于您已经按照每条记录进行分组，我认为这应该可以为您提供所需的效果。

The group tag can have the attribute isResetPageNumber. When set to true it will reset the built-in variable PAGE_NUMBER at the start of every group. As you are already grouping by each record, I think this should give you the effect you are looking for.

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