I managed to work it out by passing a column for the class of hide/show.

Code:
<div class='pure-u-1-2 name-details'>Invoice Number:</div>                                    
<div class='pure-u-1-2'>                                                                      
  <a href='#' data-ServerOnElemClick='Invoice' class='{{oShowURLInvoice}}'>{{oInvoiceNum}}</a>
  <div class='pure-u-1-2 {{oShowInvoice}}'>{{oInvoiceNum}}</div>                              
</div>                                                                                        
<div class='pure-u-1-2 name-details'>Customer reference:</div>