getGroupKeyForNodeData method
If there is a container group for the given node data, return the group's key. @param {ObjectData} nodedata a JavaScript object represented by a node, group, or non-link. @return {string|number|undefined} This returns undefined if there is no containing group data. @see #nodeGroupKeyProperty @see #setGroupKeyForNodeData
Implementation
_i2.dynamic getGroupKeyForNodeData(_i2.Object nodedata) => _i4.callMethod(
this,
'getGroupKeyForNodeData',
[nodedata],
);