How to maintain the state of Expand/Collapse nodes?

To maintain the expansion state of parent tasks as mentioned in the datasource, AutoExpandNodes function can be used.

The expected values for "AutoExpandNodes" option should be "true (or) false (or) callbackFunction".

$gantt_container.GanttControl({

....

// Callback function returns if the row is expanded or not based on datasource property 'isExpanded'

AutoExpandNodes: function (activity) {

// returning the previously saved expansion state

if (activity.DataSource.isExpanded == false)

return false;

return true;

....

});