onBeforeRowResize

fires before the user starts to resize the row height by drag-and-drop

boolean onBeforeRowResize(object item){ ... };

item

object

the task object

boolean

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

gantt.attachEvent("onBeforeRowResize", function (item) {
    gantt.message(`Start resizing <b>${item.text}</b>`);
    return true;
});

Details

The event is blockable. Returning false will prevent the row height from being resized.