private checkChildDepth(checklistItem: any, depthNow: number, parentId: string, sendDataArray?: any[]) {
    sendDataArray = sendDataArray || [];
    if (depthNow === this.maxChildDepth - 1) {
      parentId = checklistItem.id;
    }
    checklistItem.children.forEach((item: any) => {

      if (depthNow >= this.maxChildDepth - 1) {
        if (depthNow >= this.maxChildDepth) {
          item.parent = parentId;
        }
        sendDataArray = sendDataArray.concat(item, this.checkChildDepth(item, depthNow + 1, parentId, sendDataArray));
      } else {
        sendDataArray = sendDataArray.concat(this.checkChildDepth(item, depthNow + 1, parentId, sendDataArray));
      }
    });
    return sendDataArray;
  }