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Dart

Insert XML into existing XML by calling InsertChildTreeAfter

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Demonstrates how to insert an XML tree or subtree into another XML document using the InsertChildTreeAfter method.

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Dart
import 'package:chilkat/chilkat.dart';

void main() {
  // Build the 1st XML document:
  // <x1>
  //     <a1>1</a1>
  //     <a2>2</a2>
  //     <a3>3</a3>
  // </x1>

  final xml = CkXml();
  xml.tag = 'x1';
  xml.updateChildContent('a1', '1');
  xml.updateChildContent('a2', '2');
  xml.updateChildContent('a3', '3');

  // Build a 2nd XML document:

  // <x2>
  //   <b1>11</b1>
  //   <b2>22</b2>
  //   <b3>33</b3>
  // </x2>

  final xml2 = CkXml();
  xml2.tag = 'x2';
  xml2.updateChildContent('b1', '11');
  xml2.updateChildContent('b2', '22');
  xml2.updateChildContent('b3', '33');

  // We want to insert xml2 into xml to get this:

  // <x1>
  //     <a1>1</a1>
  //     <x2>
  //         <b1>11</b1>
  //         <b2>22</b2>
  //         <b3>33</b3>
  //     </x2>
  //     <a2>2</a2>
  //     <a3>3</a3>
  // </x1>

  // Insert xml2 after "a1"

  final index = xml.tagIndex('a1');
  if (index < 0) {
    print('a1 not found.');
    return;
  }

  xml.insertChildTreeAfter(index, xml2);

  print(xml.getXml());

  // The result is:

  // <x1>
  //     <a1>1</a1>
  //     <x2>
  //         <b1>11</b1>
  //         <b2>22</b2>
  //         <b3>33</b3>
  //     </x2>
  //     <a2>2</a2>
  //     <a3>3</a3>
  // </x1>

  // Note: xml2 now points to the subtree within xml.
  // For example, update "b3" and then see how it's updated within the merged document:
  xml2.updateChildContent('b3', '33333333');

  print(xml.getXml());

  // The result:

  // <x1>
  //     <a1>1</a1>
  //     <x2>
  //         <b1>11</b1>
  //         <b2>22</b2>
  //         <b3>33333333</b3>
  //     </x2>
  //     <a2>2</a2>
  //     <a3>3</a3>
  // </x1>
}