Limit number of selected items in ng-grid - angularjs

Question

Is there a way to limit the number of selected items in ng-grid?
I did not find a setting to do that, so I am trying to prevent it using a watchCollection in gridOptions.selectedItems.
When the length of selectItems is greater than 5, I try to deselect the last selection but is not working as expected because the item row index seems to be different as rendered:
This is the watcher code:
$scope.$watchCollection('gridOptions.selectedItems', function (newVal, oldVal) {
if ($scope.gridOptions.selectedItems.length > 5) {
for (var i = 0; i < $scope.importableFilesData.length; i++) {
if ($scope.importableFilesData[i] === newVal[0]) {
$scope.gridOptions.selectRow(i, false);
}
}
}

Answer 1

Check your condition in this way. So, you don't have to search last selected row and you can deselect it directly. i've tested it and is working in this way.
$scope.yourGridApi.selection.on.rowSelectionChanged($scope,function(row){
if($scope.yourGrid.gridOptions.selectedItems.length>=5){
row.isSelected = false;
}
});

Answer 2

I have found a solution using beforeSelectionChange property. This property let you set callback that is triggered every time a row is selected. If your return false, the selection will be canceled.
$scope.gridOptions = {
// your grid options ...
beforeSelectionChange: function (row) {
if ($scope.gridOptions.selectedItems.length > 5) {
return false;
}
return true;
}
}