show_confirm_dialog.js

function showConfirmDialog() {
    var confirmStrings = {
        cancelButtonLabel: "Cancel button label, by default it's CANCEL",
        confirmButtonLabel: "Confirm button label, by default it's OK",
        text: "Text show on the dialog",
        title: "Title of the confirmation dialog",
        subtitle: "Subtitle of the confirmation dialog"
    };

    var confirmOptions = {
        height: 200,
        width: 450
    };

    Xrm.Navigation.openConfirmDialog(confirmStrings, confirmOptions).then(
        success => {
            if (success.confirmed)
                console.log("Dialog closed using OK button.");
            else
                console.log("Dialog closed using Cancel button or X.");
        },
        error => {
            concole.log(error.message);
        });
}