How to validate Gantt field while Adding

In Gantt control, it is possible to validate the fields provided by the user while adding or editing the data using actionBegin client side event. This event will be triggered with requestType argument as save before saving the data to Gantt, so at this point we can validate the fields with required condition.

The following code example explains the above scenario,

The simple sample to validate the Gantt fields while adding/ editing the data is available in the following link. Sample