Xojo Plugin

Removing / Deleting Child Nodes from XML

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Demonstrates various methods for removing child nodes from an XML document.

The input XML, available at http://www.chilkatsoft.com/data/fruit.xml, is this:

<root>
    <fruit color="red">apple</fruit>
    <fruit color="green">pear</fruit>
    <veg color="orange">carrot</veg>
    <meat animal="cow">beef</meat>
    <xyz>
        <fruit color="blue">blueberry</fruit>
        <veg color="green">broccoli</veg>
    </xyz>
    <fruit color="purple">grape</fruit>
    <cheese color="yellow">cheddar</cheese>
</root>

Xojo Plugin

Dim success As Boolean
success = False

Dim xml As New Chilkat.Xml
Dim xyz As Chilkat.Xml

// The sample input XML is available at http://www.chilkatsoft.com/data/fruit.xml
success = xml.LoadXmlFile("fruit.xml")
If (success <> True) Then
    System.DebugLog(xml.LastErrorText)
    Return
End If

// The RemoveChild method removes (discards) all direct
// children having the specified tag:
xml.RemoveChild "fruit"

// Show the resulting XML:
System.DebugLog("Result with all direct children having a tag equal to ""fruit"" removed:")
System.DebugLog(xml.GetXml())

// The XML with the "fruit" direct children removed is shown below:
// Notice that the "fruit" node beneath "xyz" was not removed.
// This correct because it was not a direct child of the calling node.

// <root>
//     <veg color="orange">carrot</veg>
//     <meat animal="cow">beef</meat>
//     <xyz>
//         <fruit color="blue">blueberry</fruit>
//         <veg color="green">broccoli</veg>
//     </xyz>
//     <cheese color="yellow">cheddar</cheese>
// </root>

// --------------------------------------------------------------------------
// Restore the original XML:
success = xml.LoadXmlFile("fruit.xml")

// The RemoveChildWithContent method removes the child
// having the exact content specified, regardless of the tag.  
// For example:
xml.RemoveChildWithContent "pear"

// Show the resulting XML:
System.DebugLog("Result with the node containing ""pear"" removed:")
System.DebugLog(xml.GetXml())

// --------------------------------------------------------------------------
// Restore the original XML:
success = xml.LoadXmlFile("fruit.xml")

// The RemoveChildByIndex method removes the Nth direct
// child.  Indexing begins at 0.  The "xyz" child is at index 4:
xml.RemoveChildByIndex 4

// Show the resulting XML:
// Notice that the entire "xyz" subtree is removed.
System.DebugLog("Result with the node at index 4 removed:")
System.DebugLog(xml.GetXml())

// --------------------------------------------------------------------------
// Restore the original XML:
success = xml.LoadXmlFile("fruit.xml")

// Navigate to the node with tag "xyz"
xyz = xml.FindChild("xyz")

// Remove the "xyz" subtree making it it's own XML document
// with the "xyz" node at the root:
xyz.RemoveFromTree 

// Show both XML documents:
System.DebugLog(xyz.GetXml())
System.DebugLog(xml.GetXml())

// Also, the TreeId property is an integer value assigned
// to nodes in an XML document.  All nodes belonging to
// the same XML document will have the same TreeId.
// Notice that the "xyz" node now has a different TreeId:
System.DebugLog("xyz TreeId = " + Str(xyz.TreeId))
System.DebugLog("xml TreeId = " + Str(xml.TreeId))