JasperReports：如何判断一个字段是否被推送到下一页

我正在生成一个报告，其中包含跨越不同页面的联系人。JasperReports：如何判断一个字段是否被推送到下一页

以前我把isSplitAllowed设置为“true”。但我不希望联系人分散到不同的页面。所以我把它设置为“false”，报告的布局看起来好多了。然而它引入了一个新问题：

在我的标题中，我打印了页面的第一个人和最后一个人的名字。当联系人被推送到下一页时，它仍在当前页面中处理。假设Bob应该在第一页的底部。但为了防止它分裂，Bob现在是第二页中的第一个元素。但是，在我的第一页的标题上，我仍然有Alice ... Bob（Alice是第一页的第一个人）。在我的第二页上，我仍然有布伦达......道格（布伦达现在是第二页的第二人，道格最后一个人的第二页）。

我在报头输出是 [$ V {pageFirstItem} + “...” + $ V {pageLastItem}]]>

其中pageFirstItem是：

<variable name="pageFirstItem" class="java.lang.String" resetType="Page" calculation="First"> 
     <variableExpression><![CDATA[$F{lastName}]]></variableExpression> 
     <initialValueExpression><![CDATA[$F{lastName}]]></initialValueExpression> 
    </variable>

和pageLastItem是：

<variable name="pageLastItem" class="java.lang.String" resetType="Report" calculation="Nothing"> 
    <variableExpression><![CDATA[$F{lastName}]]></variableExpression>

来源

2012-01-31 user1181031

我附上了一个基于iReport 3.0.5的工作示例解决方案。您可以通过启用和禁用isSplitAllowed运行它来测试它。问题是即使isSplitAllowed="false"强制要在第i + 1页上打印记录，第i页上的详细记录也会被处理。

总结：

对于firstItem，不需要计算。只需将名称字段放在标题中。
对于lastItem，您需要保存使用变量prop，类型java.util.Property处理的名称。这是通过在下面的值prop.setProperty("lastSavedName", $F{Name})中设置一个虚拟的高度为0的textField来完成的。此文本字段确保名称仅在打印后保存。

然后将prop.getProperty("lastSavedName")的值从evaluationTime="Page"的标题中提取出来。

<?xml version="1.0" encoding="UTF-8" ?> 
<!-- Created with iReport - A designer for JasperReports --> 
<!DOCTYPE jasperReport PUBLIC "//JasperReports//DTD Report Design//EN" "http://jasperreports.sourceforge.net/dtds/jasperreport.dtd"> 
<jasperReport 
     name="Untitled_report_1" 
     columnCount="1" 
     printOrder="Vertical" 
     orientation="Portrait" 
     pageWidth="595" 
     pageHeight="842" 
     columnWidth="535" 
     columnSpacing="0" 
     leftMargin="30" 
     rightMargin="30" 
     topMargin="20" 
     bottomMargin="20" 
     whenNoDataType="NoPages" 
     isFloatColumnFooter="true" 
     isTitleNewPage="false" 
     isSummaryNewPage="true"> 
    <property name="ireport.zoom" value="1.0" /> 
    <property name="ireport.x" value="0" /> 
    <property name="ireport.y" value="0" /> 
    <property name="ireport.scriptlethandling" value="0" /> 
    <property name="ireport.encoding" value="UTF-8" /> 
    <import value="java.util.*" /> 
    <import value="net.sf.jasperreports.engine.*" /> 
    <import value="net.sf.jasperreports.engine.data.*" /> 

    <queryString><![CDATA[select 1 as id, 'Name 1' as name from dual union all 
select 2 as id, 'Name 2' as name from dual union all 
select 3 as id, 'Name 3' as name from dual union all 
select 4 as id, 'Name 4' as name from dual union all 
select 5 as id, 'Name 5' as name from dual union all 
select 6 as id, 'Name 6' as name from dual union all 
select 7 as id, 'Name 7' as name from dual union all 
select 8 as id, 'Name 8' as name from dual union all 
select 9 as id, 'Name 9' as name from dual union all 
select 10 as id, 'Name 10' as name from dual union all 
select 11 as id, 'Name 11' as name from dual union all 
select 12 as id, 'Name 12' as name from dual union all 
select 13 as id, 'Name 13' as name from dual union all 
select 14 as id, 'Name 14' as name from dual union all 
select 15 as id, 'Name 15' as name from dual union all 
select 16 as id, 'Name 16' as name from dual union all 
select 17 as id, 'Name 17' as name from dual union all 
select 18 as id, 'Name 18' as name from dual union all 
select 19 as id, 'Name 19' as name from dual union all 
select 20 as id, 'Name 20' as name from dual union all 
select 21 as id, 'Name 21' as name from dual union all 
select 22 as id, 'Name 22' as name from dual union all 
select 23 as id, 'Name 23' as name from dual union all 
select 24 as id, 'Name 24' as name from dual union all 
select 25 as id, 'Name 25' as name from dual union all 
select 26 as id, 'Name 26' as name from dual union all 
select 27 as id, 'Name 27' as name from dual union all 
select 28 as id, 'Name 28' as name from dual]]></queryString> 

    <field name="ID" class="java.math.BigDecimal"/> 
    <field name="NAME" class="java.lang.String"/> 

    <variable name="prop" class="java.util.Properties" resetType="Report" calculation="System"> 
     <initialValueExpression><![CDATA[new Properties()]]></initialValueExpression> 
    </variable> 
     <background> 
      <band height="0" isSplitAllowed="true" > 
      </band> 
     </background> 
     <title> 
      <band height="0" isSplitAllowed="true" > 
      </band> 
     </title> 
     <pageHeader> 
      <band height="16" isSplitAllowed="true" > 
       <textField isStretchWithOverflow="false" isBlankWhenNull="false" evaluationTime="Now" hyperlinkType="None" hyperlinkTarget="Self" > 
        <reportElement 
         x="0" 
         y="0" 
         width="96" 
         height="16" 
         key="textField-3"/> 
        <box></box> 
        <textElement> 
         <font/> 
        </textElement> 
       <textFieldExpression class="java.lang.String"><![CDATA["First " + $F{ID}]]></textFieldExpression> 
       </textField> 
       <textField isStretchWithOverflow="false" isBlankWhenNull="false" evaluationTime="Page" hyperlinkType="None" hyperlinkTarget="Self" > 
        <reportElement 
         x="96" 
         y="0" 
         width="100" 
         height="16" 
         key="textField-4"/> 
        <box></box> 
        <textElement> 
         <font/> 
        </textElement> 
       <textFieldExpression class="java.lang.String"><![CDATA["Last " + $V{prop}.getProperty("abcd")]]></textFieldExpression> 
       </textField> 
      </band> 
     </pageHeader> 
     <columnHeader> 
      <band height="20" isSplitAllowed="true" > 
       <staticText> 
        <reportElement 
         x="0" 
         y="0" 
         width="96" 
         height="20" 
         key="staticText-2"/> 
        <box></box> 
        <textElement> 
         <font/> 
        </textElement> 
       <text><![CDATA[CustomerName]]></text> 
       </staticText> 
       <staticText> 
        <reportElement 
         x="96" 
         y="0" 
         width="100" 
         height="20" 
         key="staticText-3"/> 
        <box></box> 
        <textElement> 
         <font/> 
        </textElement> 
       <text><![CDATA[Workorderid]]></text> 
       </staticText> 
      </band> 
     </columnHeader> 
     <detail> 
      <band height="18" isSplitAllowed="true" > 
       <textField isStretchWithOverflow="true" isBlankWhenNull="false" evaluationTime="Now" hyperlinkType="None" hyperlinkTarget="Self" > 
        <reportElement 
         x="0" 
         y="0" 
         width="96" 
         height="18" 
         key="textField"/> 
        <box></box> 
        <textElement> 
         <font/> 
        </textElement> 
       <textFieldExpression class="java.lang.String"><![CDATA[$F{NAME}+"This\nwill\ncause\na\nsplit."]]></textFieldExpression> 
       </textField> 
       <textField isStretchWithOverflow="false" pattern="##0.00" isBlankWhenNull="false" evaluationTime="Now" hyperlinkType="None" hyperlinkTarget="Self" > 
        <reportElement 
         x="96" 
         y="0" 
         width="100" 
         height="18" 
         key="textField"/> 
        <box></box> 
        <textElement> 
         <font/> 
        </textElement> 
       <textFieldExpression class="java.math.BigDecimal"><![CDATA[$F{ID}]]></textFieldExpression> 
       </textField> 
       <textField isStretchWithOverflow="false" isBlankWhenNull="false" evaluationTime="Band" hyperlinkType="None" hyperlinkTarget="Self" > 
        <reportElement 
         x="196" 
         y="0" 
         width="339" 
         height="0" 
         key="textField-5" 
         isRemoveLineWhenBlank="true"/> 
        <box></box> 
        <textElement> 
         <font/> 
        </textElement> 
       <textFieldExpression class="java.lang.String"><![CDATA[$V{prop}.setProperty("abcd", String.valueOf($F{ID}))]]></textFieldExpression> 
       </textField> 
      </band> 
     </detail> 
     <columnFooter> 
      <band height="0" isSplitAllowed="true" > 
      </band> 
     </columnFooter> 
     <pageFooter> 
      <band height="0" isSplitAllowed="true" > 
      </band> 
     </pageFooter> 
     <summary> 
      <band height="0" isSplitAllowed="true" > 
      </band> 
     </summary> 
</jasperReport>

来源

2012-05-03 21:53:19 user845279

JasperReports：如何判断一个字段是否被推送到下一页

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