Question

Sending request to the ActiveForms(s) WebBrowser Controls.

Asked by: carrzkiss

I have been looking at some examples which deal with
Screen.ActiveForm
This method looks very promising.

Maybe this will simplify things a little.

Lets say that you have the following

Form1 - TEdit, TButton
Form2, Form3, Form4    - WebBrowser Controls.

Form1 you do the following

Button1Click(Sender.....);
begin
     WebBrowser.Navigate(WideString('http://www.google.com/search?hl=en&q='+Edit1.Text+''));
end;

  Now since Form1 does now have a WebBrowser control on it, it needs to load the
Address into the Current ActiveForm. The ActiveForm could be either of the
Form2, Form3, Form4, exc.....
Form2.WebBrowser.Navigate.
But the Form2
Needs to be replaced by a call the Current ActiveForm in the Project.

This is more simplified then the previous question.
And hope that all get this far in there reading?

Thanks All
Wayne

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Asked On
2005-09-08 at 05:01:36ID21554526
Tags

get

Topic

Delphi Programming

Participating Experts
3
Points
250
Comments
10

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Answers

 

by: RadikalQ3Posted on 2005-09-08 at 06:55:02ID: 14844401

Hi!

Sorry, I dont understand what are you trying to make :)

>Now since Form1 does now have a WebBrowser control on it, it needs to load the
>Address into the Current ActiveForm.

If you are writing in a TEdit of Form1, the current active form will be Form1... not form2, 3 or 4... :?
Screen.ActiveForm store the form that has the focus.

Why you dont explain what are you trying to make? (maybe in that manner we can help you better)
For example: Open a google query from Form1, but show the results in other form...

 

by: carrzkissPosted on 2005-09-08 at 13:35:28ID: 14847865

RadikalQ3;

   OK.

Form1 Type in the Query and click the Button.
There is "3" other Forms Form2-Form4
It does not matter which of the Forms are open.
Once you click the Button, then your Search Query should open
The Form WebBrowser and Navigate to the page.

Instead of doing something like this
(This is what I do not want to have to do)

Button1Click(Sender.....);
begin  // Or something to this effect, I do not want to have to do.
    Form2. WebBrowser.Navigate(WideString('http://www.google.com/search?hl=en&q='+Edit1.Text+''));
    Form3. WebBrowser.Navigate(WideString('http://www.google.com/search?hl=en&q='+Edit1.Text+''));
    Form4. WebBrowser.Navigate(WideString('http://www.google.com/search?hl=en&q='+Edit1.Text+''));
end;

I would rather have a good routine, that will see which Form is opened
And then Send the Query to the given Form.

Hope that this will explain it better.

 

by: RadikalQ3Posted on 2005-09-08 at 13:54:59ID: 14848030

And if there are more of one form open?

 

by: carrzkissPosted on 2005-09-08 at 14:41:02ID: 14848362

Get the Top most Form

 

by: DragonSlayerPosted on 2005-09-08 at 19:08:20ID: 14849449

Assuming that each of the Form's web component is called WebBrowser...

procedure TForm1.Button1Click(Sender: TObject);
var
  i: Integer;
  Found: Boolean;
  Browser: TWebBrowser;
begin
  Found := False;
  for i := 0 to Screen.FormCount - 1 do
  begin
    Browser := Screen.Forms[i].FindComponent('WebBrowser') as TWebBrowser;
    if Assigned(Browser) then
    begin
      Found := True;
      Browser.Navigate(WideString('http://www.google.com/search?hl=en&q='+Edit1.Text+''));
      BringToFront;
      Break;
    end;
  end;

  // if no form exists which contain a webbrowser... we create it
  if not Found then
    with TForm2.Create(Application) do // or whatever your form class is...
    begin
      WebBrowser.Navigate(WideString('http://www.google.com/search?hl=en&q='+Edit1.Text+''));
      BringToFront;
    end;
end;



DragonSlayer.

 

by: DragonSlayerPosted on 2005-09-08 at 19:14:08ID: 14849478

Wow, finally I can post something... Been retrying for the past 20+ minutes.

 

by: rllibbyPosted on 2005-09-08 at 19:25:53ID: 14849534


DragonSlayer's post should do the trick; the only suggestion I have is to start with the Screen.ActiveForm first, just in case there is more than one app window open that contains a browser control. Just a suggestion...

Regards,
Russell

 

by: carrzkissPosted on 2005-09-09 at 05:33:32ID: 14851584

Hello Dragon;

  Code works great, Thanks a bunch.
It is nice to know that I was on the right track with looking up information on
Screen.ActiveForm....

rlibby;
  The Screen.ActiveForm. Were would I need to add this in at?
Right after the first
            begin
                   Screen.ActiveForm
And what else would go with this line?


begin
   Found := False;
   Screen.ActiveForm.......;
//......  rest of code goes here.

Dragon, I am going to give you the points, but want to wait until Russell, comes in and informs on this part here,
If so, then I want to give him some points also.

Take Care All;
Wayne

 

by: rllibbyPosted on 2005-09-10 at 08:51:02ID: 14856503

Wayne,
I wasn't looking for any points, only to make a slight suggestion to improve the "search" logic. An example of what I was suggesting:

procedure NavigateURL(URL: String);
var  pvActiveForm:  TCustomForm;
     wbControl:     TWebBrowser;
     dwIndex:       Integer;
begin

  // Get the active form
  pvActiveForm:=Screen.ActiveForm;

  // Check active form first
  if Assigned(pvActiveForm) and Assigned(pvActiveForm.FindComponent('WebBrowser')) then
     // Get reference to web browser control
     wbControl:=TWebBrowser(pvActiveForm.FindComponent('WebBrowser'))
  else
     // Set control reference to nil
     wbControl:=nil;

  // If no control then check the screen forms
  if not(Assigned(wbControl)) then
  begin
     // Walk the form list
     for dwIndex:=0 to Pred(Screen.FormCount) do
     begin
        // Skip the active form, because we already checked it
        if (Screen.Forms[dwIndex] = pvActiveForm) then Continue;
        // Check for control
        wbControl:=TWebBrowser(Screen.Forms[dwIndex].FindComponent('WebBrowser'));
        // Break if control is set
        if Assigned(wbControl) then break;
     end;
  end;

  // If browser is still not assigned then create new form instance
  if not(Assigned(wbControl)) then
  begin
     with TForm2.Create(Application) do
     begin
        wbControl:=WebBrowser;
        BringToFront;
     end;
  end;

  // Navigate to the url
  wbControl.Navigate(WideString(URL));

end;

Regards,
Russell

 

by: carrzkissPosted on 2005-09-10 at 21:04:31ID: 14858047

Glad to see that EE finally has their server issues fixed.
Just now getting in all the e-mails from this post.
Swamped :)

Guys, thanks a low.
Dragon, code works great, and with Russell's information added to it,
Makes it even more powerful.

Russell; I know that you are not at it for the points.
But I have them to give away, so you deserve to have a split.
For the information that you have provided for me here, and for
Those that will come in there after.

Take Care all;
Wayne

20120131-EE-VQP-002

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