How to collapse all tasks and expand a task by its id ?

Set AutoExpandNodes as false to collapse all the parent tasks in the gantt table. The function expandTaskByID expands the particular parent task by its id.

Here is the code example:

$(document).ready(function () {

....

$gantt_container.GanttControl({

....

AutoExpandNodes: false,

....

});

function expandTaskByID() {

// id of task to be expanded should be send as argument

var activityView = ganttControl.ActivityViews.GetActivityViewByID(1);

if (activityView != undefined || activityView != null)

activityView.IsExpanded_M(true);

}

expandTaskByID();

});