jquery setting form field value -

Hi I'm new to jQuery, but I'm trying to set form input to equal value of '# textbox' Factual of the input by the user I have done such a thing on JSfield

But what I want to know is, is there a better way of determining the factual value of input? $ ('# Textbox') Val (tmp);});

Is there any more great way to set price for your own version?