Lua

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. Lua

local chilkat = require("chilkat")

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

local xml = chilkat.Xml.new()
xml.tag = "x1"
xml:update_child_content("a1", "1")
xml:update_child_content("a2", "2")
xml:update_child_content("a3", "3")

-- Build a 2nd XML document:

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

local xml2 = chilkat.Xml.new()
xml2.tag = "x2"
xml2:update_child_content("b1", "11")
xml2:update_child_content("b2", "22")
xml2:update_child_content("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"

local index = xml:tag_index("a1")
if index < 0 then
    print("a1 not found.")
    return
end

xml:insert_child_tree_after(index, xml2)

print(xml:get_xml())

-- 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:update_child_content("b3", "33333333")

print(xml:get_xml())

-- The result:

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