[hopest]

Есть дерево:

$scope.roleList1 = [
        { "roleName" : "User", "roleId" : "role1", "children" : [
          { "roleName" : "subUser1", "roleId" : "role11", "children" : [] },
          { "roleName" : "subUser2", "roleId" : "role12", "children" : [
            { "roleName" : "subUser2-1", "roleId" : "role121", "children" : [
              { "roleName" : "subUser2-1-1", "roleId" : "role1211", "children" : [] },
              { "roleName" : "subUser2-1-2", "roleId" : "role1212", "children" : [] }
            ]}
          ]}
        ]},

        { "roleName" : "Admin", "roleId" : "role2", "children" : [] },

        { "roleName" : "Guest", "roleId" : "role3", "children" : [] }
      ];

Мне надо отыскать узел

{ "roleName" : "subUser2-1-2", "roleId" : "role1212", "children" : [] }

и сделать например его активным