Question

Filter TBrowser (restrict urls)

Asked by: sfern

Hi there,

I would like to know how to have a list of URLs and possible keywords that TBrowser will check and if its on the list it will not browser the net, something around those line. Like a url filter.

Thanks

SFern.
 

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Asked On
2006-01-26 at 00:43:19ID21710856
Tags

tbrowser

Topic

Delphi Programming

Participating Experts
1
Points
500
Comments
6

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Answers

 

by: virtorioPosted on 2006-01-26 at 01:58:01ID: 15793703

If by TBrowser you mean TWebBrowser then this is quite simple.  You'll want to write an event handler for the OnBeforeNavigate2 event.  The event properties are as follows:

OnBeforeNavigate2(
  Sender: TObject;
  const pDisp: IDispatch;
  var URL, Flags, TargetFrameName, PostData, Headers: OleVariant;
  var Cancel: WordBool);

Simply examine at the URL item (which is a string).  If you wish to stop the browser from navigating to that particular URL simply set Cancel to true, for example


procedure TMyForm.WBOnBeforeNavigate2(
  Sender: TObject;
  const pDisp: IDispatch;
  var URL, Flags, TargetFrameName, PostData, Headers: OleVariant;
  var Cancel: WordBool);
begin
  // Block AOL's web site
  if Pos('aol', URL) <> 0 then
    Cancel := true;
end;

If you wish to have a list of URLs or keywords, simply create a list of them in a TStringList object and use a for loop to go though each item Canceling the operating as necessary.

procedure TMyForm.WBOnBeforeNavigate2(
  Sender: TObject;
  const pDisp: IDispatch;
  var URL, Flags, TargetFrameName, PostData, Headers: OleVariant;
  var Cancel: WordBool);
var
  Filter: TStringList;
begin
  // Get the filter list, created and populated elsewhere
  Filter := GetFilter;

  // Search the filter and cancel as required
  for i := 0 to Keywords.Count-1 do
    if Pos(LowerCase(Keywords.Strings[i]), LowerCase(URL)) <> 0 then Cancel := true;
end;

There are of course numerous ways of filtering out URLS and keywords, this is just a simple example.

Sorry if I made any mistakes in the above code.  I can't test at the moment as I'm using a Mac.  Hope that is of some use to you.

 

by: sfernPosted on 2006-01-26 at 02:45:32ID: 15793932

How or where do i put the stringlist?

Thanks

SFern.

 

by: sfernPosted on 2006-01-26 at 02:54:41ID: 15793979

Can i have the list on a listbox for example?

 

by: virtorioPosted on 2006-01-26 at 11:47:23ID: 15798684

You can indeed.  In the code I posted above just substitude the ListBox.Items property where I called Filte, i.e:


procedure TMyForm.WBOnBeforeNavigate2(
  Sender: TObject;
  const pDisp: IDispatch;
  var URL, Flags, TargetFrameName, PostData, Headers: OleVariant;
  var Cancel: WordBool);
begin
  // Search the filter and cancel as required
  for i := 0 to Keywords.Count-1 do
    if Pos(LowerCase(ListBox1.Items.Strings[i]), LowerCase(URL)) <> 0 then Cancel := true;
end;

In the code i posted in my first reply I also made a big mistake, it should be:

procedure TMyForm.WBOnBeforeNavigate2(
  Sender: TObject;
  const pDisp: IDispatch;
  var URL, Flags, TargetFrameName, PostData, Headers: OleVariant;
  var Cancel: WordBool);
var
  Filter: TStringList;
begin
  // Get the filter list, created and populated elsewhere
  Filter := GetFilter;

  // Search the filter and cancel as required
  for i := 0 to Keywords.Count-1 do
    if Pos(LowerCase(Filter.Strings[i]), LowerCase(URL)) <> 0 then Cancel := true;
end;

 

by: sfernPosted on 2006-01-27 at 03:29:00ID: 15803741

So, Filter is a StringList

What is GetFilter?

Having problems with it sorry :o/

I am adding the ketwords directly into the Listbox.

Thanks

SFern.

 

by: sfernPosted on 2006-01-27 at 04:05:44ID: 15803956

Go it...I made some modifications for my purpose but you answered my question to exacly what i asked for.

Thanks.

SFern.

20120131-EE-VQP-002

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