Membership renewal as same type

Question

How can we ensure members renew as the same membership type? At initial sign-up, they can choose their type but after that, renewals should be as the same type - they should not be able to renew as a different type.

One option is to create separate contribution pages for each membership type, then have a join page that links to each of those. And then setup scheduled reminders for each type with links to the contribution page for renewal. With 13 membership types, that's a lot of setup.

So we're looker for a smarter way to do that. Any ideas or useful extensions? Drupal system so webforms are an option.

Answer 1

With Drupal webforms I am pretty sure you can set the Membership Type to be locked so renewing folk won't be able to change from the one that loads - will only work if they are logged in or using a checksum.

Answer 2

The key bits are:

function membershipcards_civicrm_buildForm_CRM_Contribute_Form_Contribution_Main(&$form) { 

  $currentMemberships = array_keys($form ->_currentMemberships);
  // Assuming there is only 1 current Membership - display it (first result):
  $currentMembershipID = $currentMemberships[0];
  // price_43 -> is element 24 (_label = Membership)
  // price_42 -> is element 25 (_label = Additional Contribution)
  $elementId_membership = $form->_elementIndex['price_43'];
  $elementId_latefees = $form->_elementIndex['price_42'];

  foreach ($form->_elements[$elementId_membership]->_elements as $key => $oneMembership) {
    if ($oneMembership->_attributes['membership-type'] != $currentMembershipID) {
      unset($form->_elements[$elementId_membership]->_elements[$key]);
    }
  }
...