How to bind json data to a combobox in sitecore speak application

I am trying to bind json data to a combobox in sitecore speak application. I am new to speak.Can some one suggest me how to do this? I use the following code to achieve.

 $(data.msg).map(function () {
                        return $('').val(this.value).text(this.label);
                    }).appendTo('#cbRole') 
}