How to get all the elements given the project oid and the element type oid

[raindog]

Hi, not really an issue here, but I can't get this piece of code returning correctly the toReturn array, so I'm here to ask for help.

Let's say I want to get all the ifcwalls in a project with a particular ifcwalltype via javascript api. I would like to know if there is a better way than my solution to archieve this and how can I get the toReturn array back to the calling method, because now, probably due to timing issues, sometimes is empty, no matter how I return back the data.

var BimServerGetElementsWithType = function(projectid,typeoid) { //project oid, ifcwalltype oid
      var toReturn = new Array();

      Global.bimServerApi.call("Bimsie1ServiceInterface", "getProjectByPoid", {poid: projectid}, function(project) {
        Global.bimServerApi.call("Bimsie1LowLevelInterface", "getDataObjectByOid", {roid: project.lastRevisionId, oid: typeoid},
        function(data) {
          data.values.forEach(function(value){
            if (value.__type == "SListDataValue" && value.fieldName =="ObjectTypeOf") {
              value.values.forEach(function(listItem, index) {
                if (listItem.__type == "SReferenceDataValue" && listItem.typeName == "IfcRelDefinesByType") {

                  Global.bimServerApi.call("Bimsie1LowLevelInterface", "getDataObjectByOid", {roid: project.lastRevisionId, oid: listItem.oid},
                    function(data) {
                      data.values.forEach(function(value){
                        if (value.__type == "SListDataValue") {
                          value.values.forEach(function(listItem, index){
                            if (listItem.__type == "SReferenceDataValue") {

                              Global.bimServerApi.call("Bimsie1LowLevelInterface", "getDataObjectByOid", {roid: project.lastRevisionId, oid: listItem.oid},
                              function(data){
                                toReturn.push(data); // push all the walls with type "typeoid" into the array.
                              });
                            };
                          });
                        };
                      });
                    });
                  }
              });
            }
          });
        });
      });
    };

TIA for your time.