Center on Artboards.jsx

#target Illustrator
#include "utils.jsx";

var CONFIG = {
	LOGGING			: true,
	LOG_FOLDER 		: '~/Desktop/ai-logs/',
	LOG_FILE_PATH	: '~/Desktop/ai-logs/' + Utils.doDateFormat(new Date()) + '-log.txt',
};

var originalInteractionLevel = userInteractionLevel;
userInteractionLevel = UserInteractionLevel.DONTDISPLAYALERTS;
app.coordinateSystem = CoordinateSystem.ARTBOARDCOORDINATESYSTEM;

if ( app.documents.length > 0) {

    var doc  = app.activeDocument;

    Utils.showProgressBar(doc.artboards.length);

    var interrupt = false;

    app.executeMenuCommand("fitall");

    var count = doc.artboards.length;
    for (i = 0; i < count; i++) {

        redraw();

        // The interrupt is not working yet.
        if (interrupt) break;

    	doc.artboards.setActiveArtboardIndex(i);

		var activeAB = doc.artboards[doc.artboards.getActiveArtboardIndex()];
		var right = activeAB.artboardRect[2];
		var bottom = activeAB.artboardRect[3];

		doc.selectObjectsOnActiveArtboard();

        // If there are no visible items, update the progress bar and continue.
		if (selection.length == 0) {
            Utils.updateProgress('Artboard ' + i + ' has no visible items. Skipping.');
            continue;
        }

        app.executeMenuCommand('group');
        Utils.updateProgressMessage('Grouping selection');
        /*
            Utils.updateProgressMessage(
            'Selection is ' + Utils.isVisibleAndUnlocked(selection) ? 'Visible' : 'Hidden'),
            i + 1, doc.artboards.length
        );
        */

        for (x = 0 ; x < selection.length; x++) {
            try {
                if (! Utils.isVisibleAndUnlocked(selection)) continue;
                selection[x].position = [
					Math.round((right - selection[x].width)/2),
					Math.round((bottom + selection[x].height)/2)
				];

                var scale = 105;
                try {
                    selection[x].resize(scale, scale, true, true, true, true, scale);
                }
                catch(e) {
                    $.writeln("RESIZE ERROR : " + e);
                }
            }
            catch(e) {
                Utils.logger('ERROR - ' + e.message);
            }
        }
        Utils.updateProgress('Selection centered');
    }
    Utils.progress.close();
    redraw();
}
else  {
	alert("There are no open documents");
}

try {
	userInteractionLevel = originalInteractionLevel;
}
catch(ex) {/*Exit Gracefully*/}