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[admin]

For all relevant plan links set Additional classes to plan-link plan-link-123 where 123 is plan id to which the link refers.

Custom JS:

Code:

$(function() {
  var prevId;

  function onshowplan() {
    if (prevId) {
      $('.plan-link-' + prevId).removeClass('active');
    }
    
    if (currentPlanId) {
      $('.plan-link-' + currentPlanId).addClass('active');
        prevId = currentPlanId;
    }
  }
  
  $('body').on('showplan', onshowplan);
  onshowplan();
});

Custom CSS:

Code:

.plan-link.active {
  color: red;
}