[Help] Illustrator Scale script by user defined percentage

Hello,

This is my first post here,

I am trying to create my first script to scale objects from each object's origin(center), not the overall origin.

The script goes like this:

1. You select the objects you want to scale

2. Run the script

3. Enter the scale value (just like the Scale tool in illustrator) (e.g. 50%)

4. The selected objects will be scaled by the value you entered. (e.g. 50%)

I can't figure out how to connect the value you enter to the scale function part. (textNewScale)

var totalMatrix = concatenateScaleMatrix( scaleMatrix, textNewScale, textNewScale);

- line 60 in the below script 

Here is the full script

(function () {

    // The script code goes inside this anonymous function.
    // Reusable UI variables
    var g; // group
    var p; // panel
    var w; // window

    // Permanent UI variables
    var btnCancel;
    var txtScaleSizeInput;
    var btnOk;
    var txtFolderInput;
    var textNewScale
    textNewScale = 

    // CREATE USER INTERFACE

    w = new Window("dialog", "Adobe Script Tutorial 1");
    p = w.add("panel");
    g = p.add("group");
    
    txtScaleSizeInput = g.add("edittext", undefined, textNewScale, {
        borderless: "true",
        name: textNewScale,
        
    });

    txtScaleSizeInput.preferredSize = [100, -1];
    g.alignChildren = "center";
   
    g = w.add("group");
    g.alignChildren = "center";
    btnOk = g.add("button", undefined, "OK");
    btnCancel = g.add("button", undefined, "Cancel");
    


    // UI EVENT HANDLERS
    btnOk.onClick = function () {
        w.close(1);
    };

    btnCancel.onClick = function () {
        w.close(0);
    };

    // SHOW THE WINDOW
    // w.show();

    if (w.show() == 1) {
        // alert("OK was clicked");
        process();
    }

    function process() {
            if ( app.documents.length > 0 ) {
                var moveMatrix = app.getTranslationMatrix ( 0.5, 1.5 );
                var scaleMatrix = app.getScaleMatrix (100, 100);
                var totalMatrix = concatenateScaleMatrix( scaleMatrix, textNewScale, textNewScale);
                var doc = app.activeDocument;
                for ( i = 0; i < activeDocument.selection.length; i++ ) {
                    activeDocument.selection[i].transform( totalMatrix );
                }
            }
    }

})();

Thank you