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 above example shows on how to validate the custom columns and alert the user if condition fails and cancel the add operation.
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