copy and concatenate values of multiple input boxes in a form to one input field

Question

copy/duplicate and concatenate values of multiple input boxes to one

I have input fields for street, city, state and zip and the fifth one that says complete address

Answer 1

Use the + for Javascript concatenation:

$('#latlongaddress').val($('#street').val() + ' ' +
                         $('#city').val() + ', ' +
                         $('#state').val() + ' ' +
                         $('#zip').val() );

See the jsFiddle.

Answer 2

Just for fun:

$('#latlongaddress').val( $('#street,#city,#state,#zip').map(function(){
    return $(this).val();
}).get().join(' ') );

eykanal's answer is better because it will run quicker and is easier to understand. Only actually use this for something like .val($('input')...