(Node.js) Removing / Deleting Child Nodes from XML

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>

Install Chilkat for Node.js and Electron using npm at Chilkat npm packages for Node.js Chilkat npm packages for Electron on Windows, Linux, MacOSX, and ARM

var os = require('os');
if (os.platform() == 'win32') {  
    if (os.arch() == 'ia32') {
        var chilkat = require('@chilkat/ck-node21-win-ia32');
    } else {
        var chilkat = require('@chilkat/ck-node21-win64'); 
    }
} else if (os.platform() == 'linux') {
    if (os.arch() == 'arm') {
        var chilkat = require('@chilkat/ck-node21-arm');
    } else if (os.arch() == 'x86') {
        var chilkat = require('@chilkat/ck-node21-linux32');
    } else {
        var chilkat = require('@chilkat/ck-node21-linux64');
    }
} else if (os.platform() == 'darwin') {
    if (os.arch() == 'arm64') {
        var chilkat = require('@chilkat/ck-node21-mac-m1');
    } else {
        var chilkat = require('@chilkat/ck-node21-macosx');
    }
}

function chilkatExample() {

    var xml = new chilkat.Xml();
    // xyz: Xml
    var xyz;

    var success;
    // The sample input XML is available at http://www.chilkatsoft.com/data/fruit.xml
    success = xml.LoadXmlFile("fruit.xml");
    if (success !== true) {
        console.log(xml.LastErrorText);
        return;
    }

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

    // Show the resulting XML:
    console.log("Result with all direct children having a tag equal to \"fruit\" removed:");
    console.log(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:
    console.log("Result with the node containing \"pear\" removed:");
    console.log(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.
    console.log("Result with the node at index 4 removed:");
    console.log(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:
    console.log(xyz.GetXml());
    console.log(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:
    console.log("xyz TreeId = " + xyz.TreeId);
    console.log("xml TreeId = " + xml.TreeId);


}

chilkatExample();