Making a cell in selected row non editable in kendo grid -

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i have kendo grid making column non editable when grid loads using editable:false property.

but when new record created , user can select values form combo box in grid.if particular value selected non editable field must editable.i have tried following code. nothing happens.

event_type: {     validation: {         customfn : function(input){                          if(input.attr('name')=='event_type'){                 input.attr("validationmessage", "<?php echo messageclass::setmessage("er037", "event type") ?>");                 if(input.val()== "--select--" || input.val()== '')                     return false ;                 if(input.val()=="invoice"){                     alert("invoice");                     var grid = $("#eventgrid").data("kendogrid");                     $('#event_type').attr('readonly','readonly');                 }             }              return true;         }     } }

i getting alert. nothing happens more. appreciated.


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