Im using free-jqgrid and trying to simply hande subgrid collapsed event (subGridRowColapsed). However it's never get triggered. I've tried jqGridSubgridRowColapsed also and same result. subGridRowExpanded works fine.
...
subGridRowColapsed: function (pID, rID) {
console.log("YES");
},
...
It's good if you post the version of free jqGrid, which you use.
In any way, free jqGrid don't support neither subGridRowColapsed callback nor the event jqGridSubgridRowColapsed. There are exist callbacks subGridBeforeCollapse, subGridBeforeExpand, subGridRowExpanded and events jqGridSubGridBeforeCollapse, jqGridSubGridBeforeExpand, jqGridSubGridRowExpanded, which can be used. See here and here as short documentation.