(Node.js) Find and Update an XML Attribute Value

See more XML Examples

Demonstrates how to find an element in XML with a specified attribute name and then update the attribute value.

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() {

    // Let's say you have 2 XML files with identical structures as shown directly below,
    // and you wish to update the values in the 1st XML file with those in the 2nd XML file.

    // <global>
    //     <phrase id="2FADisabled" value="2factor authentication disabled"/>
    //     <phrase id="2FAEnabled" value="2factor authentication enabled"/>
    //     <phrase id="2FAResetFailed" value="Failed to disable two factor authentication"/>
    // </global>

    // <global>
    //     <phrase id="2FAResetFailed" value="Failed to reset two factor authentication"/>
    //     <phrase id="2FADisabled" value="2FA authentication disabled"/>
    //     <phrase id="2FAEnabled" value="2FA authentication enabled"/>
    // </global>

    // First, initialize each of the Chilkat XML objects.
    // These could be loaded from files, but we'll just create them manually for this example..

    var xml1 = new chilkat.Xml();
    xml1.Tag = "global";
    xml1.UpdateAttrAt("phrase",true,"id","2FADisabled");
    xml1.UpdateAttrAt("phrase",true,"value","2factor authentication disabled");
    xml1.UpdateAttrAt("phrase[1]",true,"id","2FAEnabled");
    xml1.UpdateAttrAt("phrase[1]",true,"value","2factor authentication enabled");
    xml1.UpdateAttrAt("phrase[2]",true,"id","2FAResetFailed");
    xml1.UpdateAttrAt("phrase[2]",true,"value","Failed to disable two factor authentication");

    var xml2 = new chilkat.Xml();
    xml2.Tag = "global";
    xml2.UpdateAttrAt("phrase",true,"id","2FAResetFailed");
    xml2.UpdateAttrAt("phrase",true,"value","Failed to reset two factor authentication");
    xml2.UpdateAttrAt("phrase[1]",true,"id","2FADisabled");
    xml2.UpdateAttrAt("phrase[1]",true,"value","2FA authentication disabled");
    xml2.UpdateAttrAt("phrase[2]",true,"id","2FAEnabled");
    xml2.UpdateAttrAt("phrase[2]",true,"value","2FA authentication enabled");

    // Iterate over attribute values in xml2 and update the same in xml1.

    var phrase_id;
    var phrase_value;

    var sbPath = new chilkat.StringBuilder();

    var i = 0;
    var count_i = xml2.NumChildrenHavingTag("phrase");
    while (i < count_i) {
        xml2.I = i;
        phrase_id = xml2.ChilkatPath("phrase[i]|(id)");
        phrase_value = xml2.ChilkatPath("phrase[i]|(value)");

        // Notice how the UpdateAttrAt method's 1st argument is a Chilkat path -- which is an expression
        // to find the location of the XML element to be updated.
        // Here we create a path of the form "/A/tagName,attributeName,attributeValuePattern", which means
        // find the direct descendent of xml2 having tag=tagName, with an attribute=attributeName where the attribute value
        // matches the attributeValuePattern.  If attributeValuePattern does not contain a "*", then it must match directly.
        // We'll build a Chilkat path such as "/A/phrase,id,2FADisabled"
        sbPath.SetString("/A/phrase,id,");
        sbPath.Append(phrase_id);

        // This assumes the corresponding element exists in xml1.
        xml1.UpdateAttrAt(sbPath.GetAsString(),true,"value",phrase_value);

        i = i+1;
    }

    // Now see how xml1 has been updated..
    console.log(xml1.GetXml());

    // <global>
    //     <phrase id="2FADisabled" value="2FA authentication disabled"/>
    //     <phrase id="2FAEnabled" value="2FA authentication enabled"/>
    //     <phrase id="2FAResetFailed" value="Failed to reset two factor authentication"/>
    // </global>

}

chilkatExample();