(Delphi ActiveX) Insert XML into existing XML by calling InsertChildTreeAfter

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

Chilkat for Delphi Downloads Chilkat ActiveX DLL for Delphi Chilkat non-ActiveX DLL for Delphi * The examples here use the ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Chilkat_TLB;

...

procedure TForm1.Button1Click(Sender: TObject);
var
xml: TChilkatXml;
xml2: TChilkatXml;
index: Integer;

begin
// Build the 1st XML document:
// <x1>
//     <a1>1</a1>
//     <a2>2</a2>
//     <a3>3</a3>
// </x1>

xml := TChilkatXml.Create(Self);
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>

xml2 := TChilkatXml.Create(Self);
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"

index := xml.TagIndex('a1');
if (index < 0) then
  begin
    Memo1.Lines.Add('a1 not found.');
    Exit;
  end;

xml.InsertChildTreeAfter(index,xml2.ControlInterface);

Memo1.Lines.Add(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');

Memo1.Lines.Add(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>
end;