Display 'A' in a clicked cell in timeline view

i want to mark absent for students using timeline view, everything is working fine i.e value is going to database and all. now my question is that i want to show ‘A’ in clicked cell without open the save, cancel , delete dialog .

…thanks in advance

you can do it using a client-side API - trace the click in timeline cell and programmatically add new event, if I understand the question correctly

docs.dhtmlx.com/scheduler/api__s … event.html
docs.dhtmlx.com/scheduler/api__s … event.html