Allow user to choose which membership year to sign-up for.

[alphageekboy]

Business Rules:

1. Potential members can come to the website and choose to sign-up for membership for the current year
2. Potential members can come to the website and choose to sign-up for the next calendar year
3. Memberships are fixed 1 year by calendar year
4. Roll-Over date is same as end of calendar year

Scenario:

Ideally, this would be a drop-down box on the top of the membership form.

1. User comes to a content page, selects "Sign-Up" and is presented with a choice to sign-up for "current year (2009)" or "next year (2010)".
2. User selects "next year (2010)" and the membership record created submits with a start date of Jan-1-2010 and end date of Dec-31-2010.

Question:

I'm assuming I would need a custom field for membership year to be added to the top of the form.  What I'm unfamiliar with is the correct way to write the post hook to change the membership dates.

Can someone point to the right place or the proper way to do this.  I'm assuming I would need to use "hook_civicrm_postProcess( $formName, &$form )". And check for the membership year, and then somehow modify the start/end date. 

Is this the right way to go? Has anyone done anything similar?

[alphageekboy]

Anyone have any ideas on the best way to do this?

[Dave Greenberg]

Not sure about the details of how / if this can be done w/ a hook. However here's the code flow:

CRM_Contribute_Form_Contribution_Confirm::postProcess() calls
CRM_Member_BAO_Membership::postProcessMembership() which then calls
CRM_Member_BAO_MembershipType::getDatesForMembershipType() in order to get the correct start and end dates for the new membership.

That last method can accept an optional start_date parameter - which is basically what you need to do, because then it returns the correct dates which are used to create the membership.

So you MIGHT be able to do the following:
- use buildForm hook to inject your additional drop-down or checkbox (for this year or next year ...)
- use postProcess hook to grab the already created membership record and your custom field value - and then use the getDates... BAO to calc the new date range and then update the record with new dates.

Question: What if I want to signup for this year AND next year ??