form validation no loading page view required

Hi Everyone,

in my form validation, i don't want to load the whole html page, to trigger error, but i do not have idea how to do.

Code:

    if($this->form_validation->run() == false)
        {                            
        echo form_error('dblone_bc');
            }

 code above is work well, but when i convert the form_error('dblone_bc'); into variable so that i can pass the data into view but sad to say everything not work.   

please advise..