DynaTree: Node Level

[asp]

Hello!

For some tasks it is necessary to know the level of the particular node. Is it possible now? Or, could you add this attribute to the tree node?

[Alexander Bulei]

Hi asp,

Please check the attached demo.

We have published the jsGetActiveNode method and added new tree node command "dtnGetLevel" (check comments in demo) in next build.

Best Regards.

[asp]

Thank you!

I've understood how to deal with the level when you have an active node. But how to get the level in OnGetChildrenNode event handler if I, for example, don't want to load nodes having the level more then 3.

[Alexander Bulei]

Hi asp,

You have two ways to check it:

• Using the var on server and inc on GetChildrenNodes event.
• Extend the passed node parameters onLazyRead event:
  
  delphi code

  procedure TIWForm3.IWAppFormCreate(Sender: TObject);
  begin
    IWCGJQDynaTree1.JQDynaTreeOptions.OnLazyRead.Script:= 'function(dtnode){ dtnode.data.nodeLevel = dtnode.getLevel(); }';
  end;
  
  procedure TIWForm3.IWCGJQDynaTree1GetChildrenNodes(Sender: TObject; ANodeData: ISuperObject; var AJSon: ISuperObject);
  var
    JSonObj: ISuperObject;
    I: Integer;
    nLvl: Integer;
  begin
    nLvl:= ANodeData.I['nodeLevel'];
    AJSon:= TSuperObject.Create(stArray);
    for I := 1 to 5 do
    begin
      JSonObj:= SO();
      JSonObj.S['key']:= 'childId_' + IntToStr(i);
      JSonObj.S['title']:= 'Child ' + IntToStr(i);
      JSonObj.B['isLazy']:= True; // load children via ajax
      AJSon.AsArray.Add(JSonObj);
    end;
  end;

Best Regards.

[asp]

Thank you!