DELPHI: how to insert string data to input text box (web browser ) ?

DELPHI: how to insert string data to input text box (web browser ) ?
i trying to use
 wb1.OleObject.Document.getElementById('zip_code').setAttribute('value', '90001');

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but i got error , because the page that i want to add for it value available in iframe
Kind Regards.
napster matheoAsked:
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Sinisa VukSoftware architectCommented:
try to iterate through iframes:
....
  frameDispatch: IDispatch;
  frame_win: IHTMLWindow2;
  frame_doc: IHTMLDocument2;
  j: OleVariant;
  Tag: IHTMLElement;
...
    for i := 0 to Doc.frames.Length - 1 do
    begin
      j := i;
      frameDispatch := Doc.frames.Item(j);
      if Assigned(frameDispatch) then
      begin
        frame_win := frameDispatch as IHTMLWindow2;
        frame_doc := frame_win.document;
        Tag := frame_doc.getElementById('zip_code');
        if VarIsNull(Tag) then
        begin
           Tag.setAttribute('value', '90001');
           Break; 
         end;
      end;

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napster matheoAuthor Commented:
Thank You , I Think it's gonna be working , Once Again Thank you
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