php - .val stops form from working -

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i have this checkout page (you have add item) uses javascript / jquery seen in this jsfiddle show/hide fields separate shipping address. when showing, set value of fields '' , when hiding set values of fields same respective fields in billing form.

when submit form should taken paypal login screen (try filling out form without toggling different shipping address , submitting) if toggle shipping address comes same page.

i have debugged enough know modifying fields .val() breaking form. if comment out bits , manually toggle visibility dev tools, or if fill out billing form , never show/hide shipping (so .val() never called), works fine.

if going @ page , give try, know successful if paypal screen, otherwise coming same page (the form's action same page, can't find processes data - full php page can found here - modified version of wpec's shopping cart page

here (most of) relevant javascript:

$('#reveal-shipping').click(function(){         if ( $('.wpsc_checkout_table.table-2').is(':animated') ) return;          if( $('.wpsc_checkout_table.table-2').css('display') == 'none' ){             $('.wpsc_checkout_table.table-2').slidetoggle();             $('.wpsc_checkout_table.table-2').find('input, select, textarea').val('');              document.getelementbyid('reveal-shipping').innerhtml = 'ship billing address &larr;';         } else {             ( i=0; < fields.length; i++ ){                 thisval = $(fields[i][0]).val();                 $(fields[i][1]).val( thisval );             }             $('.wpsc_checkout_table.table-2').slidetoggle();             document.getelementbyid('reveal-shipping').innerhtml = 'ship different address &rarr;';         }     });

you can find rest on the jsfiddle , on the page itself

thanks in advance i'm stuck on this!

i think problem using display: none hide "different shipping adress". when input field has display none, not sent formular. , because of redirects checkout page.

you use visibility: hidden, still take space.

but recommend not way, because if user has turned javascript off won't work. should send field , in php, check whether different adress fields have been submitted, , if have, use them.

edit: use position place them outside of window, like:

position:absolute; top: -9999px; visibility:hidden;

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