Create a webbrowser with a progress bar

Create a webbrowser with a progress bar in 2 minutes!

This very short tutorial shows you how to add a progress bar to any web browser programs you make in less than 2 minutes. It is very basic, and kept as short as possible, you can figure out most of the code just by looking at it. Aimed at beginners, this gives you an easy and quick way to have a working progress bar which informs the user of the progress the web browser is making! You can then focus on the other tasks like for instance the graphical representation to make it the way you want it. Included is the completed example. I hope this little bit of conceptual knowledge will help you


How to build a webbrowser with a progressbar in 2 minutes!


1. Start a new project



2. Drop a TWebBrowser component



3. Drop a TEdit component

In the object inspector change its Text property in:

http://www.google.com




4. Drop a TButton component, doubleclick it and add:

FDownCount:=0;

WebBrowser1.Navigate(Edit1.Text);




5. Drop a TProgressBar




6. In the private section add:

FDownCount: Integer;




7. Select the Webbrowser component, and go to the property inspector

and click the tab Events:


Doubleclick OnDownloadBegin [in the dropdownbox] add:

Inc(FDownCount);

ProgressBar1.Position:=0;



Doubleclick OnDownloadComplete [in the dropdownbox] add:

Dec(FDownCount);

ProgressBar1.Position:=0;



Doubleclick OnProgressChange [in the dropdownbox] add:

if (ProgressMax  0) and (Progress  0) and (FDownCount  0) then

begin

ProgressBar1.Position:=Trunc(Progress / ProgressMax) * 100;

ProgressBar1.Update;

Sleep(100);

Application.ProcessMessages;

end;



8. You are finished now!


For your reference see the below Unit1.pas after it is finished:

/////////////////////////////////////////////////////////////////////

unit Unit1;

/////////////////////////////////////////////////////////////////////

interface

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uses

Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,

Dialogs, ComCtrls, StdCtrls, OleCtrls, SHDocVw;

/////////////////////////////////////////////////////////////////////

type

TForm1 = class(TForm)

Edit1: TEdit;

ProgressBar1: TProgressBar;

Button1: TButton;

WebBrowser1: TWebBrowser;

procedure Button1Click(Sender: TObject);

procedure Webbrowser1DownloadBegin(Sender: TObject);

procedure Webbrowser1DownloadComplete(Sender: TObject);

procedure Webbrowser1ProgressChange(Sender: TObject; Progress,

ProgressMax: Integer);

private

FDownCount: Integer;

public

{ Public declarations }

end;

/////////////////////////////////////////////////////////////////////

var

Form1: TForm1;

/////////////////////////////////////////////////////////////////////

implementation


{$R *.dfm}

/////////////////////////////////////////////////////////////////////

procedure TForm1.Button1Click(Sender: TObject);

begin

FDownCount:=0;

WebBrowser1.Navigate(Edit1.Text);

end;

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procedure TForm1.Webbrowser1DownloadBegin(Sender: TObject);

begin

Inc(FDownCount);

ProgressBar1.Position:=0;

end;

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procedure TForm1.Webbrowser1DownloadComplete(Sender: TObject);

begin

Dec(FDownCount);

ProgressBar1.Position:=0;

end;

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procedure TForm1.Webbrowser1ProgressChange(Sender: TObject; Progress,

ProgressMax: Integer);

begin

if (ProgressMax  0) and (Progress  0) and (FDownCount  0) then

begin

ProgressBar1.Position:=Trunc(Progress / ProgressMax) * 100;

ProgressBar1.Update;

Sleep(100);

Application.ProcessMessages;

end;

end;

/////////////////////////////////////////////////////////////////////

end.

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