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

void onTaskMultiSelect(string|number id,boolean state,Event e);
idstring|numberthe id of a task
statebooleantrue if the task has been selected, false - if unselected
eEventa native event object


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


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.

See also
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