onTaskMultiSelect

fires after the task selection state has changed (the task has been selected/unselected)

void onTaskMultiSelect(string|number id,boolean state,Event e);

id	string\|number	the id of a task
state	boolean	true if the task has been selected, false - if unselected
e	Event	a native event object

Example

gantt.attachEvent("onTaskMultiSelect", function(id, state, e){
    // some logic here
});

Details

This event is defined in the multiselect extension, so you need to activate the multiselect plugin. Read the details in the Multi-Task Selection article.

The event is called for each task of the range.