javascript - 如何在 JavaScript 中使用 XPath 从命名空间的 OOXML 中进行选择？

Question

我正在构建一个工具，以使用 XPath 表达式从用户指定的 XML 文件中获取数据。简单的 XML 文件和具有单个 namespace 的 XML 文件工作正常，但我没有让以下 XML 文件工作，其中相同的前缀在不同的层次级别被覆盖:

<?xml version="1.0"?>
<?mso-application progid="Excel.Sheet"?>
<Workbook xmlns="urn:schemas-microsoft-com:office:spreadsheet"
 xmlns:o="urn:schemas-microsoft-com:office:office"
 xmlns:x="urn:schemas-microsoft-com:office:excel"
 xmlns:ss="urn:schemas-microsoft-com:office:spreadsheet"
 xmlns:html="http://www.w3.org/TR/REC-html40">
 <DocumentProperties xmlns="urn:schemas-microsoft-com:office:office">
  <Author>Microsoft Office User</Author>
  <LastAuthor>Microsoft Office User</LastAuthor>
  <Created>2019-12-03T15:40:13Z</Created>
  <Version>16.00</Version>
 </DocumentProperties>
 <OfficeDocumentSettings xmlns="urn:schemas-microsoft-com:office:office">
  <AllowPNG/>
 </OfficeDocumentSettings>
 <ExcelWorkbook xmlns="urn:schemas-microsoft-com:office:excel">
  <WindowHeight>13820</WindowHeight>
  <WindowWidth>23740</WindowWidth>
  <WindowTopX>1520</WindowTopX>
  <WindowTopY>1620</WindowTopY>
  <ProtectStructure>False</ProtectStructure>
  <ProtectWindows>False</ProtectWindows>
 </ExcelWorkbook>
 <Styles>
  <Style ss:ID="Default" ss:Name="Normal">
   <Alignment ss:Vertical="Bottom"/>
   <Borders/>
   <Font ss:FontName="Calibri" x:Family="Swiss" ss:Size="12" ss:Color="#000000"/>
   <Interior/>
   <NumberFormat/>
   <Protection/>
  </Style>
 </Styles>
 <Worksheet ss:Name="Blad1">
  <Table ss:ExpandedColumnCount="2" ss:ExpandedRowCount="8" x:FullColumns="1"
   x:FullRows="1" ss:DefaultColumnWidth="65" ss:DefaultRowHeight="16">
   <Row>
    <Cell><Data ss:Type="String">dfgdfgdfg</Data></Cell>
    <Cell><Data ss:Type="Number">1150</Data></Cell>
   </Row>
   <Row>
    <Cell><Data ss:Type="String">werwerwe</Data></Cell>
    <Cell><Data ss:Type="Number">889</Data></Cell>
   </Row>
  </Table>
  <WorksheetOptions xmlns="urn:schemas-microsoft-com:office:excel">
   <PageSetup>
    <Header x:Margin="0.3"/>
    <Footer x:Margin="0.3"/>
    <PageMargins x:Bottom="0.75" x:Left="0.7" x:Right="0.7" x:Top="0.75"/>
   </PageSetup>
   <Selected/>
   <Panes>
    <Pane>
     <Number>3</Number>
     <RangeSelection>R1C1:R8C2</RangeSelection>
    </Pane>
   </Panes>
   <ProtectObjects>False</ProtectObjects>
   <ProtectScenarios>False</ProtectScenarios>
  </WorksheetOptions>
 </Worksheet>
</Workbook>

我正在测试的xpath是

/Workbook[@xmlns="urn:schemas-microsoft-com:office:spreadsheet"]/Worksheet[@ss:Name="Blad1"]/Table[@ss:ExpandedColumnCount="2"]/Row[1]/Cell[2]/Data[@ss:Type="Number"]/text()

这是解析和搜索节点的代码:

// downloadedData is a string with the xml, xPath is the string with the xpath

var parser, xmlDoc;

parser = new DOMParser();
xmlDoc = parser.parseFromString(downloadedData, "text/xml");

var xmlEvaluator = new XPathEvaluator();
var xmlResolver = xmlEvaluator.createNSResolver(xmlDoc);
var node = xmlEvaluator.evaluate(xPath, xmlDoc, xmlResolver, XPathResult.FIRST_ORDERED_NODE_TYPE, null);

/// node always empty here

编辑: 删除了代码中的拼写错误(与实际问题无关)

Answer 1

XPath 数据模型中的命名空间不是属性，所以这永远行不通:

Workbook[@xmlns="urn:schemas-microsoft-com:office:spreadsheet"]

相反，您需要绑定(bind)命名空间前缀并在您的元素名称中使用它们:

x:Workbook

其中命名空间前缀 x 绑定(bind)到 URI“urn:schemas-microsoft-com:office:spreadsheet”。绑定(bind)是使用 namespaceResolver 建立的，如下所述:

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Introduction_to_using_XPath_in_JavaScript