Jquery disable button until ready

I am in the middle of this site here http://offline.raileisure.开发者_JAVA百科com/

the booking section on the right hand side, I need to be able to disable the book now button until the date,duration and adult and children numbers are set..

I can't work out how to do it..

Any ideas ??

Thanks Lee

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You can bind to the change handler on all your form elements... for example:

$(':input').change(function() {
    var complete;

    // check if your form is complete here

    // assumes the id of the button is 'bookNowButton'
    if (!complete) $('#bookNowButton').attr('disabled', true);
    else $('#bookNowButton').removeAttr('disabled');
});

To simplify the enable/disable functionality I'd also perhaps suggest changing your "Book Now" button to an <input type="image" /> instead.