JQuery EasyUI 动态改变表单项的验证守则

//JQuery EasyUI 动态改变表单项的验证规则
$(document).ready(function(){
    $('#FILE_QUALITY').combobox({
        onChange:function(newValue,oldValue){
            if(newValue == 2){
                $('#FRONT_FOR_UNIT').validatebox({
                    required: false
                });
            } else if(newValue == 0){
                $('#FRONT_FOR_UNIT').validatebox({
                    required: true,
                     validType: 'length[1,512]'
                });
            }
            $.parser.parse($("#FRONT_FOR_UNIT"));
        }
    });
});