ChrisRaven/jstree-grid — comment on commit e95482be8011e59d8506e18da6ed3108f40a2c15
File: jstreegrid.js line 212
By ChrisRaven:

val - value of the clicked cell,
column - name of column header where the cell belongs,
node - associated node from the tree,
sourceName - name of field (attribute or data), which was the source for data in the cell,
sourceType - 'attr' or 'metadata'.