Disable vertical drag and drop for few tasks

Gantt
#1

hi, i have sceneario where vertical drag and drop is enabled for few tasks and disabled for few tasks, how to disable vertical drop for few tasks?? please help

#2

Hello,
You can use onBeforeTaskUpdate event handler and return false for the tasks with the certain condition. If a task fits that condition, you won’t be able to vertically reorder that task.
In the following example I disabled vertical reorder for the tasks with the “duration” more than 2 days:
http://snippet.dhtmlx.com/12a1372bc

You can learn more about that event handler in the following article:
https://docs.dhtmlx.com/gantt/api__gantt_onrowdragstart_event.html