XPath-基于以下同级选择节点_Xpath_Qml

XPath-基于以下同级选择节点

xpath qml

XPath-基于以下同级选择节点,xpath,qml,Xpath,Qml,我有这样一个问题： /plist/dict[1]/dict/dict/dict/key/following-sibling::dict/string[string()='Algier'] 我真正想要选择的是“key”节点（就在下面的同级：：dict之前） xml如下所示： <?xml version="1.0" encoding="UTF-8"?> <plist version="1.0"> <dict> <key>en_GB&l

我有这样一个问题：

/plist/dict[1]/dict/dict/dict/key/following-sibling::dict/string[string()='Algier']

我真正想要选择的是“key”节点（就在下面的同级：：dict之前）

xml如下所示：

<?xml version="1.0" encoding="UTF-8"?>
<plist version="1.0">
    <dict>
    <key>en_GB</key>
            <dict>
                <key>Africa</key>
                <dict>
                    <key>Algeria</key>
                    <dict>
                        <key>60390</key>
                        <dict>
                            <key>NAME</key>
                            <string>Algier</string>
                            <key>LATITUDE</key>
                            <string>36.7500</string>
                            <key>LONGITUDE</key>
                            <string>3.0500</string>
                        </dict>
                        <key>60391</key>
                        <dict>
                            <key>NAME</key>
                            <string>Some other city</string>
                            <key>LATITUDE</key>
                            <string>36.7500</string>
                            <key>LONGITUDE</key>
                            <string>3.0500</string>
                        </dict>
                    </dict>
                </dict>
        </dict>
    </dict>
</plist>

似乎嵌套的后面的兄弟姐妹不起作用。例如：

query: "/*/dict/dict/dict/dict/key[following-sibling::dict[1]/key[.='NAME']]"
这两者都会返回：

Error XPST0003 in file:///Users/Ali/qtprojects/welocationtest-build-simulator/welocationtest.app/Contents/MacOS/welocationtest, at line 2, column 97: syntax error, unexpected ], expecting ) Error XPST0003 in file:///Users/Ali/qtprojects/welocationtest-build-simulator/welocationtest.app/Contents/MacOS/welocationtest, at line 2, column 91: syntax error, unexpected ], expecting end of file file:///Users/Ali/qtprojects/welocationtest-build-simulator/welocationtest.app/Contents/Resources/qml/welocationtest/main.qml:17:9: QML XmlRole: invalid query: "name()" Location Model Ready 0

QML是否可能不符合XPath标准？该解决方案适用于所有其他路径编辑器
选择所需的
键
元素的XPath表达式如下所示：

/*/dict/dict/dict/dict /key [following-sibling::dict[1]/key [.='NAME' and following-sibling::string[1] = $pCity ] ]

<key>60390</key>

<key>60391</key>

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"> <xsl:output omit-xml-declaration="yes" indent="yes"/> <xsl:param name="pCity" select="'Some other city'"/> <xsl:template match="/"> <xsl:copy-of select= "/*/dict/dict/dict/dict /key [following-sibling::dict[1]/key [.='NAME' and following-sibling::string[1] = $pCity ] ] "/> </xsl:template> </xsl:stylesheet>

<plist version="1.0"> <dict> <key>en_GB</key> <dict> <key>Africa</key> <dict> <key>Algeria</key> <dict> <key>60390</key> <dict> <key>NAME</key> <string>Algier</string> <key>LATITUDE</key> <string>36.7500</string> <key>LONGITUDE</key> <string>3.0500</string> </dict> <key>60391</key> <dict> <key>NAME</key> <string>Some other city</string> <key>LATITUDE</key> <string>36.7500</string> <key>LONGITUDE</key> <string>3.0500</string> </dict> </dict> </dict> </dict> </dict> </plist>

<key>60391</key>

<xsl:param name="pCity" select="'Some other city'"/>

<xsl:param name="pCity" select="'Algier'"/>

<key>60390</key>
当$pCity被
“Algier”
设置/替换时，此XPath表达式将选择：

/*/dict/dict/dict/dict /key [following-sibling::dict[1]/key [.='NAME' and following-sibling::string[1] = $pCity ] ]

<key>60390</key>

<key>60391</key>

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"> <xsl:output omit-xml-declaration="yes" indent="yes"/> <xsl:param name="pCity" select="'Some other city'"/> <xsl:template match="/"> <xsl:copy-of select= "/*/dict/dict/dict/dict /key [following-sibling::dict[1]/key [.='NAME' and following-sibling::string[1] = $pCity ] ] "/> </xsl:template> </xsl:stylesheet>

<plist version="1.0"> <dict> <key>en_GB</key> <dict> <key>Africa</key> <dict> <key>Algeria</key> <dict> <key>60390</key> <dict> <key>NAME</key> <string>Algier</string> <key>LATITUDE</key> <string>36.7500</string> <key>LONGITUDE</key> <string>3.0500</string> </dict> <key>60391</key> <dict> <key>NAME</key> <string>Some other city</string> <key>LATITUDE</key> <string>36.7500</string> <key>LONGITUDE</key> <string>3.0500</string> </dict> </dict> </dict> </dict> </dict> </plist>

<key>60391</key>

<xsl:param name="pCity" select="'Some other city'"/>

<xsl:param name="pCity" select="'Algier'"/>

<key>60390</key>
基于XSLT的验证：

/*/dict/dict/dict/dict /key [following-sibling::dict[1]/key [.='NAME' and following-sibling::string[1] = $pCity ] ]

<key>60390</key>

<key>60391</key>

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"> <xsl:output omit-xml-declaration="yes" indent="yes"/> <xsl:param name="pCity" select="'Some other city'"/> <xsl:template match="/"> <xsl:copy-of select= "/*/dict/dict/dict/dict /key [following-sibling::dict[1]/key [.='NAME' and following-sibling::string[1] = $pCity ] ] "/> </xsl:template> </xsl:stylesheet>

<plist version="1.0"> <dict> <key>en_GB</key> <dict> <key>Africa</key> <dict> <key>Algeria</key> <dict> <key>60390</key> <dict> <key>NAME</key> <string>Algier</string> <key>LATITUDE</key> <string>36.7500</string> <key>LONGITUDE</key> <string>3.0500</string> </dict> <key>60391</key> <dict> <key>NAME</key> <string>Some other city</string> <key>LATITUDE</key> <string>36.7500</string> <key>LONGITUDE</key> <string>3.0500</string> </dict> </dict> </dict> </dict> </dict> </plist>

<key>60391</key>

<xsl:param name="pCity" select="'Some other city'"/>

<xsl:param name="pCity" select="'Algier'"/>

<key>60390</key>

对提供的XML文档应用此转换时：

/*/dict/dict/dict/dict /key [following-sibling::dict[1]/key [.='NAME' and following-sibling::string[1] = $pCity ] ]

<key>60390</key>

<key>60391</key>

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"> <xsl:output omit-xml-declaration="yes" indent="yes"/> <xsl:param name="pCity" select="'Some other city'"/> <xsl:template match="/"> <xsl:copy-of select= "/*/dict/dict/dict/dict /key [following-sibling::dict[1]/key [.='NAME' and following-sibling::string[1] = $pCity ] ] "/> </xsl:template> </xsl:stylesheet>

<plist version="1.0"> <dict> <key>en_GB</key> <dict> <key>Africa</key> <dict> <key>Algeria</key> <dict> <key>60390</key> <dict> <key>NAME</key> <string>Algier</string> <key>LATITUDE</key> <string>36.7500</string> <key>LONGITUDE</key> <string>3.0500</string> </dict> <key>60391</key> <dict> <key>NAME</key> <string>Some other city</string> <key>LATITUDE</key> <string>36.7500</string> <key>LONGITUDE</key> <string>3.0500</string> </dict> </dict> </dict> </dict> </dict> </plist>

<key>60391</key>

<xsl:param name="pCity" select="'Some other city'"/>

<xsl:param name="pCity" select="'Algier'"/>

<key>60390</key>

英国非洲阿尔及利亚 60390 名称阿尔及尔纬度 36.7500 经度 3.0500 60391 名称其他城市纬度 36.7500 经度 3.0500
生成所需的正确结果：

/*/dict/dict/dict/dict /key [following-sibling::dict[1]/key [.='NAME' and following-sibling::string[1] = $pCity ] ]

<key>60390</key>

<key>60391</key>

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"> <xsl:output omit-xml-declaration="yes" indent="yes"/> <xsl:param name="pCity" select="'Some other city'"/> <xsl:template match="/"> <xsl:copy-of select= "/*/dict/dict/dict/dict /key [following-sibling::dict[1]/key [.='NAME' and following-sibling::string[1] = $pCity ] ] "/> </xsl:template> </xsl:stylesheet>

<plist version="1.0"> <dict> <key>en_GB</key> <dict> <key>Africa</key> <dict> <key>Algeria</key> <dict> <key>60390</key> <dict> <key>NAME</key> <string>Algier</string> <key>LATITUDE</key> <string>36.7500</string> <key>LONGITUDE</key> <string>3.0500</string> </dict> <key>60391</key> <dict> <key>NAME</key> <string>Some other city</string> <key>LATITUDE</key> <string>36.7500</string> <key>LONGITUDE</key> <string>3.0500</string> </dict> </dict> </dict> </dict> </dict> </plist>

<key>60391</key>

<xsl:param name="pCity" select="'Some other city'"/>

<xsl:param name="pCity" select="'Algier'"/>

<key>60390</key>

60391
在上述转换中，我们将替换：

/*/dict/dict/dict/dict /key [following-sibling::dict[1]/key [.='NAME' and following-sibling::string[1] = $pCity ] ]

<key>60390</key>

<key>60391</key>

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"> <xsl:output omit-xml-declaration="yes" indent="yes"/> <xsl:param name="pCity" select="'Some other city'"/> <xsl:template match="/"> <xsl:copy-of select= "/*/dict/dict/dict/dict /key [following-sibling::dict[1]/key [.='NAME' and following-sibling::string[1] = $pCity ] ] "/> </xsl:template> </xsl:stylesheet>

<plist version="1.0"> <dict> <key>en_GB</key> <dict> <key>Africa</key> <dict> <key>Algeria</key> <dict> <key>60390</key> <dict> <key>NAME</key> <string>Algier</string> <key>LATITUDE</key> <string>36.7500</string> <key>LONGITUDE</key> <string>3.0500</string> </dict> <key>60391</key> <dict> <key>NAME</key> <string>Some other city</string> <key>LATITUDE</key> <string>36.7500</string> <key>LONGITUDE</key> <string>3.0500</string> </dict> </dict> </dict> </dict> </dict> </plist>

<key>60391</key>

<xsl:param name="pCity" select="'Some other city'"/>

<xsl:param name="pCity" select="'Algier'"/>

<key>60390</key>

与：

/*/dict/dict/dict/dict /key [following-sibling::dict[1]/key [.='NAME' and following-sibling::string[1] = $pCity ] ]

<key>60390</key>

<key>60391</key>

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"> <xsl:output omit-xml-declaration="yes" indent="yes"/> <xsl:param name="pCity" select="'Some other city'"/> <xsl:template match="/"> <xsl:copy-of select= "/*/dict/dict/dict/dict /key [following-sibling::dict[1]/key [.='NAME' and following-sibling::string[1] = $pCity ] ] "/> </xsl:template> </xsl:stylesheet>

<plist version="1.0"> <dict> <key>en_GB</key> <dict> <key>Africa</key> <dict> <key>Algeria</key> <dict> <key>60390</key> <dict> <key>NAME</key> <string>Algier</string> <key>LATITUDE</key> <string>36.7500</string> <key>LONGITUDE</key> <string>3.0500</string> </dict> <key>60391</key> <dict> <key>NAME</key> <string>Some other city</string> <key>LATITUDE</key> <string>36.7500</string> <key>LONGITUDE</key> <string>3.0500</string> </dict> </dict> </dict> </dict> </dict> </plist>

<key>60391</key>

<xsl:param name="pCity" select="'Some other city'"/>

<xsl:param name="pCity" select="'Algier'"/>

<key>60390</key>

并再次应用转换，然后再次得到正确的结果：

/*/dict/dict/dict/dict /key [following-sibling::dict[1]/key [.='NAME' and following-sibling::string[1] = $pCity ] ]

<key>60390</key>

<key>60391</key>

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"> <xsl:output omit-xml-declaration="yes" indent="yes"/> <xsl:param name="pCity" select="'Some other city'"/> <xsl:template match="/"> <xsl:copy-of select= "/*/dict/dict/dict/dict /key [following-sibling::dict[1]/key [.='NAME' and following-sibling::string[1] = $pCity ] ] "/> </xsl:template> </xsl:stylesheet>

<plist version="1.0"> <dict> <key>en_GB</key> <dict> <key>Africa</key> <dict> <key>Algeria</key> <dict> <key>60390</key> <dict> <key>NAME</key> <string>Algier</string> <key>LATITUDE</key> <string>36.7500</string> <key>LONGITUDE</key> <string>3.0500</string> </dict> <key>60391</key> <dict> <key>NAME</key> <string>Some other city</string> <key>LATITUDE</key> <string>36.7500</string> <key>LONGITUDE</key> <string>3.0500</string> </dict> </dict> </dict> </dict> </dict> </plist>

<key>60391</key>

<xsl:param name="pCity" select="'Some other city'"/>

<xsl:param name="pCity" select="'Algier'"/>

<key>60390</key>

60390
要获取一个城市的数字，您也可以使用正则表达式（特别是在QML XPath支持不够好的情况下）：

导入QtQuick 1.0 长方形{ id:集装箱宽度：360 身高：360 Component.onCompleted：{ LoadWeLocationFile（）； } 属性字符串weLocationsXML 信号weLocationsLoaded（）函数LoadWeLocationFile（）{ //加载文件 var doc=新的XMLHttpRequest（）； doc.onreadystatechange=函数（）{ if（doc.readyState==XMLHttpRequest.DONE）{ //获取文件内容 weLocationsXML=doc.responseText； //发射信号 weLocationsLoaded（）； } } 打开文档（“GET”、“we_locations.plist”）； doc.send（）； } 函数getIDByName（名称）{ //转义正则表达式的特殊字符（可能有更好的方法） var safeName=name.replace（/[-，？+*\\^$（）[\]{}\\\\\\\]]/g，“\\$&”）； //创建正则表达式 var regex=new RegExp（“（**？\\s*\\s*NAME\\s*”+safeName+”，“m”）； //执行正则表达式 var match=regex.exec（weLocationsXML）； if（match！=null&&match.length>1）{ 返回匹配项[1]；//找到名称，组1包含id }否则{ 返回null；//在XML中没有这样的名称 } } //测试它。。。 onWeLocationsLoaded：{ log（“阿尔及尔”的编号：”，getIDByName（“阿尔及尔”）； log（“NotInXML”的编号：”，getIDByName（“NotInXML”）； log（“某个其他城市的编号：”，getIDByName（“某个其他城市”）； } }
输出：

Number for 'Algier': 60390 Number for 'NotInXML': null Number for 'Some other city': 60391

如果您需要QML模型中的数字，您可以创建一个
ListModel
并将数字添加到其中。
Hmm，听起来很合理。尽管我必须在QML中检查它，以真正将其标记为正确答案。我将在这段时间内投票，因为我似乎正在使用其他工具。：）德文：不用谢。如果QML实现了XPath（正如它应该实现的那样），那么它应该会使用此解决方案产生所需的结果。似乎QML存在缺陷且不符合要求……难怪诺基亚现在正处于这样的境地：（我看了一遍，我同意，如果QML在给定的XPath表达式上抛出上述错误，那么QML有一个bug。为什么它会期望一个
）
，而没有
（
？你能提交一个bug报告吗？这个错误似乎是针对：
查询：“name（）”；
。您想在这里具体说明什么？太棒了。非常感谢：）。现在解决了我的问题。