I’m assuming you also want the form to submit results to your email IN ADDITION to diverting the user to the relevant page. If this is the case you have a couple of options. The first will be to deploy a custom form script that will redirect the user after form submission based on the selection made in the selector box. This can be a little complicated if you’re not familiar with PHP coding. Remember, that redirects are handle by the form script AFTER receipt of the form. As far as I know there isn’t an option to redirect AND submit in a single operation in any form processing application - the form has to be received by the script and then read by the processing application. It can then be programmed to take further action based on the contents of the form.
The second option is far easier to implement and would probably be easier for your users (particularly if they use mobile devices)
Instead of using a drop-down selector within the form, present users with a choice BEFORE taking them to a form. In the example below. I’ve created selection buttons that users can choose before being taken to the enquiry form:
The buttons are set to open a modal containing a product specific enquiry form. For example, when Option 1 is selected, The form pops up in a modal, like this.
The form in the modal can be be set to redirect users to a specific page in your website, and each can have a different message header that specifies the product of interest.
You can now duplicate the modal for every option and edit the form properties on each version to go to a different success page and to have a different subject line.
To the end user, it looks like you have one form, but behind the scenes, each of the forms will have it’s own properties that will redirect upon submission.
If you use this type of structure, be sure to give the modals and the forms unique ID’s so that it will be easier for you to identify the components when setting up links and editing properties etc.
To make the selector and forms more interesting, you could use small product images as the links to trigger the modals, and you could use the same images as a background to the header in each Modal. This acts as sort of reinforcement that the user has selected the right option. It would look something like this (only set up one button in this example)