The visibility of variables

[Сергей Александрович]

Please help me. I can't figure out how to see (use) the variable described in the program in a JavaScript script. For example:

Public
mTextToPrint: String;
.....
procedure TfmViewCheck.IWAppFormShow(Sender: TObject);
begin
mTextToPrint := 'Текст для печати';
end;

язык JavaScript :
alert (mTextToPrint); - does not work