Hi,

pega.ui.busyIndicator is the main object - you can use the following code example to define the function and then use them in Run script action

var myappGlobal = {
    busyIndicator: undefined
};

var showBusyIndicator = function () {
    try {
        if (pega.ui.busyIndicator) {
            if (!myappGlobal.busyIndicator) {
                busyIndicator = new pega.ui.busyIndicator("Loading", true);
            }

            myappGlobal.busyIndicator.show();
        }
    }
    catch (e) {

    }
}

var hideBusyIndicator = function (e) {
    try {
        myappGlobal.busyIndicator.hide();
    }
    catch (e) {

    }
};