onTaskStartResize event is fired when user starts to resize a Task item.
One parameter is passed to the handler:
You may return false from this handler to cancel resizing.
ganttChartControl.attachEvent("onTaskStartResize", function(task){ // Sample custom code for resizing if (task.getId()==13) { task._initialCompleteHours = task.getDuration() * task.getPercentCompleted() / 100; } // Disable resizing for Task with Id = 3 if (task.getId()==3) return false; });