Is seems that grid (in my case a tree-grid) already handles shift-click and ctrl-click for it’s select events. I’d like to capture alt-click and attach a function to it. Is this possible?
Inside onRowSelect event you will not have info about state of keys. It possible to attach native html event , but in such case you will lost info about position in grid.
You can combine both approaches to have the necessary use-case
mygrid.alt_flag = e.altKey; //save state of alt key
if (this.alt_flag) do_the_deeds(); //custom reaction on alt click