Collapse tree using button

[otoja]

Hi, Can someone tell me, what is the nicer way to collapse the tree (each node) on button click?

For now I'm using something like:

$scope.collapseTree = function(){
    $scope.nodeList.forEach(function (node){
         node.expanded = false;
    });
};

But I am not sure if this is the best option. Thanks, Kamila