在更新之前确定元素值
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【中文标题】在更新之前确定元素值【英文标题】：Determine element value before updating it 【发布时间】：2021-11-15 03:31:55 【问题描述】：我希望我的 xslt 在更新之前检查字段的值。因此，当带有关键字“已批准”或“拒绝”的批准电子邮件发送到系统时，xslt 会相应地运行更新系统中的批准。如果批准已被批准或拒绝，则 xslt 不应再次更新它. 下面是更新字段的 xslt 的摘录：
<!-- *********************** -->
<!-- BEGIN: Define Variables -->
<!-- *********************** -->
<!-- find the profile link recid of the email sender -->
<xsl:variable name="profilelink_recid">
<!-- for each RelatedBusinessObject -->
<xsl:for-each select="BusinessObjectList/BusinessObject/RelatedBusinessObjectList/RelatedBusinessObject/BusinessObject">
<xsl:choose>
<xsl:when test="@Name = 'Employee'">
<xsl:for-each select="./FieldList/Field">
<xsl:choose>
<xsl:when test="@Name = 'RecId'">
<xsl:value-of select="."/>
</xsl:when>
</xsl:choose>
</xsl:for-each>
</xsl:when>
</xsl:choose>
</xsl:for-each>
</xsl:variable>
<!-- find the profile link category of the email sender -->
<xsl:variable name="profilelink_cat">
<!-- for each RelatedBusinessObject -->
<xsl:for-each select="BusinessObjectList/BusinessObject/RelatedBusinessObjectList/RelatedBusinessObject/BusinessObject">
<xsl:choose>
<xsl:when test="@Name = 'Employee'">
<xsl:value-of select="'Employee'"/>
</xsl:when>
</xsl:choose>
</xsl:for-each>
</xsl:variable>
<!-- find subject and subjectID -->
<xsl:variable name="emailSubject" select = "BusinessObjectList/BusinessObject/EmailMessage/Subject" />
<xsl:variable name="emailSubjectID" select = "BusinessObjectList/BusinessObject/EmailMessage/SubjectID" />
<xsl:variable name="emailBody" select = "BusinessObjectList/BusinessObject/EmailMessage/Body" />
<xsl:variable name="EmailStatus" select="substring-before($emailBody,' ')"/>
<xsl:for-each select="BusinessObjectList/BusinessObject">
<xsl:element name="BusinessObject">
<xsl:attribute name="Name"><xsl:value-of select="'FRS_ApprovalVoteTracking'"/></xsl:attribute>
<!-- Set Transaction as 'Update'. It will try to update existing record using UniqueKey value, otherwise it will fail. -->
<xsl:element name="Transaction">Update</xsl:element>
<!--Unique Key List-->
<xsl:element name="UniqueKeyList">
<xsl:element name="UniqueKey">
<xsl:element name="Field">
<xsl:attribute name="Name"><xsl:value-of select="'TrackingID'"/></xsl:attribute>
</xsl:element>
</xsl:element>
</xsl:element>
<FieldList>
<!-- Fields -->
<xsl:for-each select="EmailMessage/node()">
<xsl:choose>
<xsl:when test="name() = 'SubjectID'">
<xsl:element name="Field">
<xsl:attribute name="Name"><xsl:text>TrackingID</xsl:text></xsl:attribute>
<xsl:attribute name="Type">System.Int32</xsl:attribute>
<xsl:value-of select="."/>
</xsl:element>
</xsl:when>
<xsl:when test="name() = 'Body'">
<xsl:element name="Field">
<xsl:attribute name="Name"><xsl:text>Status</xsl:text></xsl:attribute>
<xsl:choose>
<xsl:when test="contains($EmailStatus,'Approved')">
<xsl:text>Approved</xsl:text>
</xsl:when>
<xsl:when test="contains($EmailStatus,'Approve')">
<xsl:text>Approved</xsl:text>
</xsl:when>
<xsl:when test="contains($EmailStatus,'Denied')">
<xsl:text>Denied</xsl:text>
</xsl:when>
<xsl:when test="contains($EmailStatus,'Deny')">
<xsl:text>Denied</xsl:text>
</xsl:when>
<xsl:when test="contains($EmailStatus,'approved')">
<xsl:text>Approved</xsl:text>
</xsl:when>
<xsl:when test="contains($EmailStatus,'approve')">
<xsl:text>Approved</xsl:text>
</xsl:when>
<xsl:when test="contains($EmailStatus,'denied')">
<xsl:text>Denied</xsl:text>
</xsl:when>
<xsl:when test="contains($EmailStatus,'deny')">
<xsl:text>Denied</xsl:text>
</xsl:when>
<xsl:otherwise>
<xsl:text></xsl:text>
</xsl:otherwise>
</xsl:choose>
</xsl:element>
<xsl:element name="Field">
<xsl:attribute name="Name"><xsl:text>Reason</xsl:text></xsl:attribute>
<xsl:choose>
<xsl:when test="contains($EmailStatus,'Denied')">
<xsl:text>Denied by Email</xsl:text>
</xsl:when>
<xsl:when test="contains($EmailStatus,'Deny')">
<xsl:text>Denied by Email</xsl:text>
</xsl:when>
<xsl:otherwise>
<xsl:text></xsl:text>
<!-- <xsl:value-of select="$EmailStatus"/> -->
</xsl:otherwise>
</xsl:choose>
</xsl:element>
</xsl:when>
</xsl:choose>
</xsl:for-each>
</FieldList>
<!-- Copy the RelatedBusinessObjectList element-->
<xsl:element name="RelatedBusinessObjectList">
<xsl:for-each select="RelatedBusinessObjectList">
<xsl:copy-of select="node()"/>
</xsl:for-each>
</xsl:element>
</xsl:element>
</xsl:for-each>
<!--</xsl:element> -->
<!--</xsl:element> -->
</BusinessObjectList>
</xsl:template>
</xsl:stylesheet>
所以 xslt 应该检查批准的当前状态，即如果它是“待定”，那么它应该更新，如果不是它不应该。
你知道怎么做吗？
【问题讨论】：
请在您的问题中发布minimal reproducible example，包括输入、您的尝试和预期输出作为代码，而不是外部链接中的图片。 投反对票，因为代码仅作为图像提供。 ***.com/help/someone-answers 【参考方案1】：常见的方法是使用predicate 使用与您要修改的元素匹配的模板。例如：
XML
<Items>
<Item>
<ID>1</ID>
<Name>Alpha</Name>
<Color>Red</Color>
<Status>Good</Status>
</Item>
<Item>
<ID>2</ID>
<Name>Bravo</Name>
<Color>Green</Color>
<Status>Pending</Status>
</Item>
<Item>
<ID>3</ID>
<Name>Charlie</Name>
<Color>Blue</Color>
<Status>Bad</Status>
</Item>
<Item>
<ID>4</ID>
<Name>Delta</Name>
<Color>White</Color>
<Status>Pending</Status>
</Item>
</Items>
XSLT 1.0
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="xml" version="1.0" encoding="UTF-8" indent="yes"/>
<xsl:strip-space elements="*"/>
<!-- identity transform -->
<xsl:template match="@*|node()">
<xsl:copy>
<xsl:apply-templates select="@*|node()"/>
</xsl:copy>
</xsl:template>
<xsl:template match="Status[.='Pending']">
<xsl:copy>
<xsl:text>Denied</xsl:text>
</xsl:copy>
</xsl:template>
</xsl:stylesheet>
结果
<?xml version="1.0" encoding="UTF-8"?>
<Items>
<Item>
<ID>1</ID>
<Name>Alpha</Name>
<Color>Red</Color>
<Status>Good</Status>
</Item>
<Item>
<ID>2</ID>
<Name>Bravo</Name>
<Color>Green</Color>
<Status>Denied</Status>
</Item>
<Item>
<ID>3</ID>
<Name>Charlie</Name>
<Color>Blue</Color>
<Status>Bad</Status>
</Item>
<Item>
<ID>4</ID>
<Name>Delta</Name>
<Color>White</Color>
<Status>Denied</Status>
</Item>
</Items>
【讨论】：
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