onBeforeTaskDrag

fires after the user has pressed the mouse button and started dragging, but before dhtmlxGantt starts the drag-and-drop operation

id	string|number	the task id
mode	string	the drag-and-drop mode ("resize", "progress", "move", "ignore")
e	Event	a native event object

boolean

defines whether the default action of the event will be triggered (true) or canceled (false)

Example

gantt.attachEvent("onBeforeTaskDrag", function(id, mode, e){
    //any custom logic here
    return true;
});

Related samples

The event fires when the user drags a task in the timeline area.

The event is blockable. Return false and the task will be backed to the initial position.

Back to top