Lianja

Find and Update an XML Attribute Value

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Demonstrates how to find an element in XML with a specified attribute name and then update the attribute value. Lianja

// Let's say you have 2 XML files with identical structures as shown directly below,
// and you wish to update the values in the 1st XML file with those in the 2nd XML file.

// <global>
//     <phrase id="2FADisabled" value="2factor authentication disabled"/>
//     <phrase id="2FAEnabled" value="2factor authentication enabled"/>
//     <phrase id="2FAResetFailed" value="Failed to disable two factor authentication"/>
// </global>

// <global>
//     <phrase id="2FAResetFailed" value="Failed to reset two factor authentication"/>
//     <phrase id="2FADisabled" value="2FA authentication disabled"/>
//     <phrase id="2FAEnabled" value="2FA authentication enabled"/>
// </global>

// First, initialize each of the Chilkat XML objects.
// These could be loaded from files, but we'll just create them manually for this example..

loXml1 = createobject("CkXml")
loXml1.Tag = "global"
loXml1.UpdateAttrAt("phrase",.T.,"id","2FADisabled")
loXml1.UpdateAttrAt("phrase",.T.,"value","2factor authentication disabled")
loXml1.UpdateAttrAt("phrase[1]",.T.,"id","2FAEnabled")
loXml1.UpdateAttrAt("phrase[1]",.T.,"value","2factor authentication enabled")
loXml1.UpdateAttrAt("phrase[2]",.T.,"id","2FAResetFailed")
loXml1.UpdateAttrAt("phrase[2]",.T.,"value","Failed to disable two factor authentication")

loXml2 = createobject("CkXml")
loXml2.Tag = "global"
loXml2.UpdateAttrAt("phrase",.T.,"id","2FAResetFailed")
loXml2.UpdateAttrAt("phrase",.T.,"value","Failed to reset two factor authentication")
loXml2.UpdateAttrAt("phrase[1]",.T.,"id","2FADisabled")
loXml2.UpdateAttrAt("phrase[1]",.T.,"value","2FA authentication disabled")
loXml2.UpdateAttrAt("phrase[2]",.T.,"id","2FAEnabled")
loXml2.UpdateAttrAt("phrase[2]",.T.,"value","2FA authentication enabled")

// Iterate over attribute values in xml2 and update the same in xml1.

loSbPath = createobject("CkStringBuilder")

i = 0
lnCount_i = loXml2.NumChildrenHavingTag("phrase")
do while i < lnCount_i
    loXml2.I = i
    lcPhrase_id = loXml2.ChilkatPath("phrase[i]|(id)")
    lcPhrase_value = loXml2.ChilkatPath("phrase[i]|(value)")

    // Notice how the UpdateAttrAt method's 1st argument is a Chilkat path -- which is an expression
    // to find the location of the XML element to be updated.
    // Here we create a path of the form "/A/tagName,attributeName,attributeValuePattern", which means
    // find the direct descendent of xml2 having tag=tagName, with an attribute=attributeName where the attribute value
    // matches the attributeValuePattern.  If attributeValuePattern does not contain a "*", then it must match directly.
    // We'll build a Chilkat path such as "/A/phrase,id,2FADisabled"
    loSbPath.SetString("/A/phrase,id,")
    loSbPath.Append(lcPhrase_id)

    // This assumes the corresponding element exists in xml1.
    loXml1.UpdateAttrAt(loSbPath.GetAsString(),.T.,"value",lcPhrase_value)

    i = i + 1
enddo

// Now see how xml1 has been updated..
? loXml1.GetXml()

// <global>
//     <phrase id="2FADisabled" value="2FA authentication disabled"/>
//     <phrase id="2FAEnabled" value="2FA authentication enabled"/>
//     <phrase id="2FAResetFailed" value="Failed to reset two factor authentication"/>
// </global>


release loXml1
release loXml2
release loSbPath