B4X

Traverse Direct Children via FirstChild / NextSibling, or LastChild / PreviousSibling

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Demonstrates some ways to iterate over direct child nodes using the FirstChild / NextSibling and LastChild / PreviousSibling methods.

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>

B4X

Dim success As Boolean = False

Dim xml As ChilkatXml
xml.Initialize
Dim child As ChilkatXml
Dim nextSibling As ChilkatXml
Dim prevSibling As ChilkatXml

success = xml.LoadXmlFile("qa_data/xml/fruit.xml")
If success <> True Then
    Log(xml.LastErrorText)
    Return
End If


'  Iterate over the direct children by using FirstChild / NextSibling
child = xml.FirstChild
Dim bContinue As Boolean = xml.LastMethodSuccess
Do While (bContinue = True)
    Log(child.Tag & " : " & child.Content)
    nextSibling = child.NextSibling
    bContinue = child.LastMethodSuccess

    child = nextSibling
Loop
Log("-----")

'  Do the same, but with FirstChild2 / NextSibling2 to avoid
'  creating so many XML object instances:
success = xml.FirstChild2
Do While success = True
    Log(xml.Tag & " : " & xml.Content)
    success = xml.NextSibling2
Loop
'  Revert back up to the parent:
success = xml.GetParent2

Log("-----")

'  Iterate in reverse order using LastChild / PreviousSibling
child = xml.LastChild
bContinue = xml.LastMethodSuccess
Do While (bContinue = True)
    Log(child.Tag & " : " & child.Content)
    prevSibling = child.PreviousSibling
    bContinue = child.LastMethodSuccess

    child = prevSibling
Loop
Log("-----")

'  Do the same, but with LastChild2 / PreviousSibling2 to avoid
'  creating so many XML object instances:
success = xml.LastChild2
Do While success = True
    Log(xml.Tag & " : " & xml.Content)
    success = xml.PreviousSibling2
Loop
'  Revert back up to the parent:
success = xml.GetParent2