Additional Settings condition based on dropdown

Replies: 0

I am looking to add a condition on the Contact Form 7 Additional Settings but really struggling because I am not sure what is supported and not.

Basically I want to do a basic validation based on the drop-down value in order to send user to to different “location.replace” PayPal link.

For example, the cost will be different between U7 and U8.

if the user selected U7 from dropdown
{
    location.replace('https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=XXXXX');
}
else if user selected U8
{
    location.replace('https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=YYYYY');
}
else
{
    do nothing
}

Please help and thank you so much in advance.