问题描述
它需要实现一种机制来计算重复网格的数量并将值发送到专用单元格（名为 x）。
我需要在单元格 x 中使用什么表达式？
解决方法
如果在重复网格中有一个名为 first-name 的字段，则在重复网格外的控件中使用的表达式 count($first-name) 将返回重复网格中的行数。假设您的复选框字段名为 checkbox，您的表达式将如下所示：
if ($checkbox/string() = 'true')
then count($first-name)
else 0
您可以在下面找到显示此操作的测试表单的来源，并且在运行时您会得到如下内容：
<xh:html xmlns:sql="http://orbeon.org/oxf/xml/sql"
xmlns:fr="http://orbeon.org/oxf/xml/form-runner"
xmlns:ev="http://www.w3.org/2001/xml-events"
xmlns:xxf="http://orbeon.org/oxf/xml/xforms"
xmlns:map="http://www.w3.org/2005/xpath-functions/map"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns:xh="http://www.w3.org/1999/xhtml"
xmlns:array="http://www.w3.org/2005/xpath-functions/array"
xmlns:math="http://www.w3.org/2005/xpath-functions/math"
xmlns:exf="http://www.exforms.org/exf/1-0"
xmlns:saxon="http://saxon.sf.net/"
xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"
xmlns:fb="http://orbeon.org/oxf/xml/form-builder"
xmlns:xxi="http://orbeon.org/oxf/xml/xinclude"
xmlns:xi="http://www.w3.org/2001/XInclude"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:xf="http://www.w3.org/2002/xforms">
<xh:head>
<xh:title>Counting the number of rows in a repeated grid</xh:title>
<xf:model id="fr-form-model" xxf:expose-xpath-types="true" xxf:analysis.calculate="true">
<!-- Main instance -->
<xf:instance id="fr-form-instance" xxf:exclude-result-prefixes="#all" xxf:index="id">
<form>
<section-1>
<grid-1>
<checkbox question-identifier="">true</checkbox>
<count question-identifier=""/>
</grid-1>
<grid-2>
<grid-2-iteration>
<first-name question-identifier=""/>
</grid-2-iteration>
</grid-2>
</section-1>
</form>
</xf:instance>
<!-- Bindings -->
<xf:bind id="fr-form-binds" ref="instance('fr-form-instance')">
<xf:bind id="section-1-bind" name="section-1" ref="section-1">
<xf:bind id="grid-1-bind" ref="grid-1" name="grid-1">
<xf:bind id="count-bind" name="count" ref="count" xxf:whitespace="trim"
calculate="if ($checkbox/string() = 'true')
then count($first-name)
else 0"
readonly="false()"/>
<xf:bind id="checkbox-bind" ref="checkbox" name="checkbox" type="xf:boolean"/>
</xf:bind>
<xf:bind id="grid-2-bind" ref="grid-2" name="grid-2"
relevant="$checkbox/string() = 'true'">
<xf:bind id="grid-2-iteration-bind" ref="grid-2-iteration" name="grid-2-iteration">
<xf:bind id="first-name-bind" ref="first-name" name="first-name" xxf:whitespace="trim"/>
</xf:bind>
</xf:bind>
</xf:bind>
</xf:bind>
<!-- Metadata -->
<xf:instance id="fr-form-metadata" xxf:readonly="true" xxf:exclude-result-prefixes="#all">
<metadata>
<application-name>a</application-name>
<form-name>a</form-name>
<title xml:lang="en">Counting the number of rows in a repeated grid</title>
<description xml:lang="en"/>
<created-with-version>2019.1-SNAPSHOT PE</created-with-version>
<library-versions>
<orbeon>1</orbeon>
<app>2</app>
</library-versions>
</metadata>
</xf:instance>
<!-- Attachments -->
<xf:instance id="fr-form-attachments" xxf:exclude-result-prefixes="#all">
<attachments/>
</xf:instance>
<!-- All form resources -->
<xf:instance xxf:readonly="true" id="fr-form-resources" xxf:exclude-result-prefixes="#all">
<resources>
<resource xml:lang="en">
<checkbox>
<label>Show repeated grid</label>
<hint/>
</checkbox>
<count>
<label>Count</label>
<hint/>
</count>
<first-name>
<label>First name</label>
<hint/>
</first-name>
<section-1>
<label>Untitled Section</label>
</section-1>
</resource>
</resources>
</xf:instance>
<xf:instance xxf:readonly="true" id="grid-2-template" xxf:exclude-result-prefixes="#all">
<grid-2-iteration>
<first-name/>
</grid-2-iteration>
</xf:instance>
</xf:model>
</xh:head>
<xh:body>
<fr:view>
<fr:body xmlns:xbl="http://www.w3.org/ns/xbl" xmlns:p="http://www.orbeon.com/oxf/pipeline"
xmlns:oxf="http://www.orbeon.com/oxf/processors">
<fr:section id="section-1-section" bind="section-1-bind">
<xf:label ref="$form-resources/section-1/label"/>
<fr:grid id="grid-1-grid" bind="grid-1-bind">
<fr:c y="1" x="1" w="6">
<fr:checkbox-input id="checkbox-control" bind="checkbox-bind">
<xf:label ref="$form-resources/checkbox/label"/>
<xf:hint ref="$form-resources/checkbox/hint"/>
<xf:alert ref="$fr-resources/detail/labels/alert"/>
</fr:checkbox-input>
</fr:c>
<fr:c y="1" x="7" w="6">
<xf:input id="count-control" bind="count-bind">
<xf:label ref="$form-resources/count/label"/>
<xf:hint ref="$form-resources/count/hint"/>
<xf:alert ref="$fr-resources/detail/labels/alert"/>
</xf:input>
</fr:c>
</fr:grid>
<fr:grid id="grid-2-grid" bind="grid-2-bind" repeat="content" min="1"
template="instance('grid-2-template')"
apply-defaults="true"
fb:initial-iterations="first">
<fr:c x="1" y="1" w="6">
<xf:input id="first-name-control" bind="first-name-bind">
<xf:label ref="$form-resources/first-name/label"/>
<xf:hint ref="$form-resources/first-name/hint"/>
<xf:alert ref="$fr-resources/detail/labels/alert"/>
</xf:input>
</fr:c>
<fr:c x="7" y="1" w="6"/>
</fr:grid>
</fr:section>
</fr:body>
</fr:view>
</xh:body>
</xh:html>