Delphi与Javascript的交互

网络上也有人写了关于Delphi与Javascript的文章，其大多数使用ScriptControl等，均无法达到与Delphi自身融合的效果。我也是在翻阅自己的组件库的时候发现了这个以前收集来的代码。这个主要是使用了Mozilla的Javascript引擎，所以在程序运行的时候必须带上js3215R.dll和msvcr70.dll这两个动态链接库。

现在我们来看一看几个例子：

例程1：

说明：该例程主要是把Javascript代码以字符串的形式内置在Delphi程序代码内，然后与Delphi交互的。

unit Form;

{$I delphi.inc}

interface

uses
  Windows, Messages, SysUtils, {$IFDEF D6OR7}Variants, {$ENDIF}Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, jsintf;

type
  TForm1 = class(TForm)
    Button1: TButton;
    Edit1: TEdit;
    procedure Button1Click(Sender: TObject);
    procedure FormDestroy(Sender: TObject);
    procedure FormCreate(Sender: TObject);
  private
    FEngine: TJSEngine;
  public
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.FormCreate(Sender: TObject);
begin
  FEngine := TJSEngine.Create(40000);
  FEngine.StartDebugger;

FEngine.Global.AddNativeObject(Edit1, ‘edit‘);
  FEngine.Global.AddNativeObject(Button1, ‘button‘);

FEngine.Global.Evaluate(‘function toggle() { ‘ +
                          ‘  edit.Visible = ! edit.Visible;‘ +   // Toggle the visible property on/off
                          ‘  button.Caption = (edit.Visible ? "Hide" : "Show");‘ + // Change button
                          ‘}‘);
end;

procedure TForm1.FormDestroy(Sender: TObject);
begin
  FEngine.Free;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  FEngine.Global.Evaluate(‘toggle()‘);
end;

end.
------------------------------------------------------------------------------------------------------
例程2：
说明：就是在例程的基础上把Javascript代码放置于Delphi程序外。

unit Form;

{$I delphi.inc}

interface

uses
  Windows, Messages, SysUtils, {$IFDEF D6OR7}Variants, {$ENDIF}Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, jsintf;

type
  TForm1 = class(TForm)
    Button1: TButton;
    Edit1: TEdit;
    procedure FormCreate(Sender: TObject);
    procedure FormDestroy(Sender: TObject);
    procedure Button1Click(Sender: TObject);
  private
    FEngine: TJSEngine;
    FScript: TJSScript;
  public
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.FormCreate(Sender: TObject);
begin
  FEngine := TJSEngine.Create(40000);
  FScript := TJSScript.Create;

FEngine.Global.AddNativeObject(Edit1, ‘edit‘);
  FEngine.Global.AddNativeObject(Button1, ‘button‘);

FScript.LoadRaw(‘script.js‘); // Load the javascript code from file
  FScript.Execute(FEngine);     // Register the function with the JS engine
end;

procedure TForm1.FormDestroy(Sender: TObject);
begin
  FEngine.Free;
  FScript.Free;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  FEngine.Global.Evaluate(‘toggle()‘);
end;

end.

Javascript代码如下：
function toggle() {
  edit.Visible = ! edit.Visible;  // Toggle the visible property on/off
  button.Caption = (edit.Visible ? "Hide" : "Show");  // Change button
}

本来还有一个例程我也就不贴了，最后把所有的代码一并打包提供下载，祝大家Enjoy Youself！
 点击下载此文件(2.07 MB)

http://www.lsworks.net/article/56.html