2.0网页之可脚本化, 与DOM的交互, 与JavaScript的交互

介绍
Silverlight 2.0 使用c#开发可脚本化的代码，Silverlight与宿主页面的DOM之间的交互，Silverlight与宿主页面的JavaScript之间的交互
    ScriptableMemberAttribute - 需要脚本化的属性、方法、事件要标记为此
    HtmlPage.RegisterScriptableObject - 将可脚本化对象注册到客户端
    HtmlElement -  表示网页的文档对象模型 (DOM) 中的 HTML 元素
    HtmlWindow - 提供 JavaScript 的 window 对象的 Silverlight 端的托管表示形式


在线DEMO
http://www.cnblogs.com/webabcd/archive/2008/10/09/1307486.html


示例
1、Silverlight对可脚本化的支持
Scriptable.cs

using  System;
using  System.Net;
using  System.Windows;
using  System.Windows.Controls;
using  System.Windows.Documents;
using  System.Windows.Ink;
using  System.Windows.Input;
using  System.Windows.Media;
using  System.Windows.Media.Animation;
using  System.Windows.Shapes;

using  System.Windows.Browser;

namespace  Silverlight20.WebPage
{
    /**//*
     * 脚本化的类必须是 public 的
     * 需要脚本化的属性、方法、事件要标记为 [ScriptableMember]
     * 如果类被标记为 [ScriptableType]，则意味着其属性、方法、事件都是ScriptableMemberAttribute
     */

    /**//// <summary>
    /// 用于演示脚本化的类
    /// </summary>
    // [ScriptableType]
    public class Scriptable
    {
        /**//// <summary>
        /// 当前服务端的时间
        /// </summary>
        [ScriptableMember]
        public DateTime CurrentTime { get; set; }

        /**//// <summary>
        /// Hello 方法
        /// </summary>
        /// <param name="name">名字</param>
        /// <returns></returns>
        [ScriptableMember]
        public string Hello(string name)
        {
            return string.Format("Hello: {0}", name);
        }
        
        /**//// <summary>
        /// 开始事件
        /// </summary>
        [ScriptableMember]
        public event EventHandler<StartEventArgs> Start;

        /**//// <summary>
        /// 触发开始事件所调用的方法
        /// </summary>
        /// <param name="dt"></param>
        public void OnStart(DateTime dt)
        {
            if (Start != null)
            {
                Start(this, new StartEventArgs()
                {
                    CurrentTime = dt
                });
            }
        }

    }

    /**//// <summary>
    /// 开始事件的 EventArgs
    /// </summary>
    public class StartEventArgs : EventArgs
    {
        /**//// <summary>
        /// 当前服务端的时间
        /// </summary>
        [ScriptableMember]
        public DateTime CurrentTime { get; set; }
    }
}

ScriptableDemo.xaml.cs

using  System;
using  System.Collections.Generic;
using  System.Linq;
using  System.Net;
using  System.Windows;
using  System.Windows.Controls;
using  System.Windows.Documents;
using  System.Windows.Input;
using  System.Windows.Media;
using  System.Windows.Media.Animation;
using  System.Windows.Shapes;

using  System.Windows.Browser;

namespace  Silverlight20.WebPage
{
    public partial class ScriptableDemo : UserControl
    {
        System.Threading.Timer _timer;
        System.Threading.SynchronizationContext _syncContext;

        public ScriptableDemo()
        {
            InitializeComponent();

            this.Loaded += new RoutedEventHandler(ScriptableDemo_Loaded);
        }

        void ScriptableDemo_Loaded(object sender, RoutedEventArgs e)
        {
            // UI 线程
            _syncContext = System.Threading.SynchronizationContext.Current;

            Scriptable s = new Scriptable() { CurrentTime = DateTime.Now };

            // 将 Scriptable 对象注册到客户端中，所对应的客户端的对象名为 scriptable
            HtmlPage.RegisterScriptableObject("scriptable", s);

            _timer = new System.Threading.Timer(MyTimerCallback, s, 0, 1000);
        }

        private void MyTimerCallback(object state)
        {
            Scriptable s = state as Scriptable;

            // 每秒调用一次 UI 线程上的指定的方法
            _syncContext.Post(OnStart, s);
        }

        void OnStart(object state)
        {
            Scriptable s = state as Scriptable;

            // 调用 Scriptable 对象的 OnStart() 方法，以触发 Start 事件
            s.OnStart(DateTime.Now);
        }
    }
}

ScriptableDemo.html

<! DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" >
< html  xmlns ="http://www.w3.org/1999/xhtml" >
< head >
     < title > Silverlight20 </ title >
     < style  type ="text/css" >
        html, body
        {}{
            height: 100%;
            overflow: auto;
        }
        body
        {}{
            padding: 0;
            margin: 0;
        }
        #silverlightControlHost
        {}{
            height: 100%;
        }
     </ style >

     < script  type ="text/javascript"  src ="../Silverlight.js" ></ script >

     < script  type ="text/javascript" >
        function scriptableDemo() {

            // scriptable - Silverlight 注册到客户端的对象
            var obj = document.getElementById("xaml1").content.scriptable;
            var output = document.getElementById('result');

            output.innerHTML += obj.CurrentTime
            output.innerHTML += '<br />';

            output.innerHTML += obj.Hello("webabcd");
            output.innerHTML += '<br />';

            // obj.Start = responseStart;
            // addEventListener - 添加事件监听器
            // removeEventListener - 移除事件监听器
            obj.addEventListener("Start", responseStart);
        }

        function responseStart(sender, args) {
            document.getElementById('result').innerHTML += args.CurrentTime;
            document.getElementById('result').innerHTML += '<br />';
        }
     </ script >

</ head >
< body >
     < div  style ="font-size: 12px"  id ="result" >
     </ div >
     < div  style ="font-size: 12px"  onclick ="scriptableDemo();" >
        加载了 Silverlight20.WebPage.ScriptableDemo 后，单击这里以测试 Silverlight 对可脚本化的支持 </ div >
     < div  id ="silverlightControlHost" >
         < object  id ="xaml1"  data ="data:application/x-silverlight-2,"  type ="application/x-silverlight-2"
            width ="100%"  height ="100%" >
             < param  name ="source"  value ="../ClientBin/Silverlight20.xap"   />
             < param  name ="EnableHtmlAccess"  value ="true"   />
         </ object >
         < iframe  style ='visibility:  hidden; height: 0; width: 0; border: 0px' ></ iframe >
     </ div >
</ body >
</ html >

2、Silverlight与网页的DOM之间的交互
DOMDemo.xaml

< UserControl  x:Class ="Silverlight20.WebPage.DOMDemo"
    xmlns ="http://schemas.microsoft.com/winfx/2006/xaml/presentation"  
    xmlns:x ="http://schemas.microsoft.com/winfx/2006/xaml" >
     < StackPanel  HorizontalAlignment ="Left"  Margin ="5" >

         < TextBox  x:Name ="txtMsg"   />
        
     </ StackPanel >
</ UserControl >

DOMDemo.xaml.cs

using  System;
using  System.Collections.Generic;
using  System.Linq;
using  System.Net;
using  System.Windows;
using  System.Windows.Controls;
using  System.Windows.Documents;
using  System.Windows.Input;
using  System.Windows.Media;
using  System.Windows.Media.Animation;
using  System.Windows.Shapes;

using  System.Windows.Browser;

namespace  Silverlight20.WebPage
{
    public partial class DOMDemo : UserControl
    {
        public DOMDemo()
        {
            InitializeComponent();

            Demo();
        }

        void Demo()
        {
            // 获取当前页面的 id 为 hello 的DOM，并设置其样式
            HtmlElement container = HtmlPage.Document.GetElementById("hello");
            container.SetStyleAttribute("display", "block");

            // 创建一个 ul 
            HtmlElement ul = HtmlPage.Document.CreateElement("ul");

            for (int i = 0; i < 10; i++)
            {
                // 创建一个 li ，并设置其显示的内容
                HtmlElement li = HtmlPage.Document.CreateElement("li");
                li.SetAttribute("innerText", "hi: DOM");

                // 将 li 添加到 ul 内
                ul.AppendChild(li);
            }

            // 将 ul 添加到 id 为 hello 的 DOM 内
            container.AppendChild(ul);


            // 创建一个页面的 button ，并设置其 value 属性和 onclick 事件
            HtmlElement button = HtmlPage.Document.CreateElement("button");
            button.SetProperty("value", "hi: Silverlight");
            button.AttachEvent("onclick", new EventHandler<HtmlEventArgs>(HelloClick));

            // 将 button 添加到 id 为 hello 的 DOM 内
            container.AppendChild(button);
        }

        void HelloClick(object sender, HtmlEventArgs e)
        {
            // 页面的 button 单击后所需执行的逻辑
            txtMsg.Text += "hi: Silverlight\r\n";
        }
    }
}

DOMDemo.html

<! DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" >
< html  xmlns ="http://www.w3.org/1999/xhtml" >
< head >
     < title > Silverlight20 </ title >
     < style  type ="text/css" >
        html, body
        {}{
            height: 100%;
            overflow: auto;
        }
        body
        {}{
            padding: 0;
            margin: 0;
        }
        #silverlightControlHost
        {}{
            height: 100%;
        }
     </ style >

     < script  type ="text/javascript"  src ="../Silverlight.js" ></ script >

</ head >
< body >
     <!-- 由 Silverlight 控制此 id 为 hello 的 DOM -->
     < div  style ="font-size: 12px; display: none"  id ="hello" >
     </ div >
     < div  style ="font-size: 12px" >
        加载 Silverlight20.WebPage.DOMDemo 后，测试 Silverlight 和页面 DOM 的交互 </ div >
     < div  id ="silverlightControlHost" >
         < object  id ="xaml1"  data ="data:application/x-silverlight-2,"  type ="application/x-silverlight-2"
            width ="100%"  height ="100%" >
             < param  name ="source"  value ="../ClientBin/Silverlight20.xap"   />
             < param  name ="EnableHtmlAccess"  value ="true"   />
         </ object >
         < iframe  style ='visibility:  hidden; height: 0; width: 0; border: 0px' ></ iframe >
     </ div >
</ body >
</ html >

3、Silverlight与网页的JavaScript之间的交互
JSDemo.xaml

< UserControl  x:Class ="Silverlight20.WebPage.JSDemo"
    xmlns ="http://schemas.microsoft.com/winfx/2006/xaml/presentation"  
    xmlns:x ="http://schemas.microsoft.com/winfx/2006/xaml" >
     < StackPanel  HorizontalAlignment ="Left"  Margin ="5" >

         < Button  Margin ="5"  x:Name ="invokeJS"  Content ="调用JavaScript"  Click ="invokeJS_Click"   />
        
         < TextBox  Margin ="5"  x:Name ="txtMsg"   />

     </ StackPanel >
</ UserControl >

JSDemo.xaml.cs

using  System;
using  System.Collections.Generic;
using  System.Linq;
using  System.Net;
using  System.Windows;
using  System.Windows.Controls;
using  System.Windows.Documents;
using  System.Windows.Input;
using  System.Windows.Media;
using  System.Windows.Media.Animation;
using  System.Windows.Shapes;

using  System.Windows.Browser;

namespace  Silverlight20.WebPage
{
    public partial class JSDemo : UserControl
    {
        public JSDemo()
        {
            InitializeComponent();

            this.Loaded += new RoutedEventHandler(JSDemo_Loaded);
        }

        private void invokeJS_Click(object sender, RoutedEventArgs e)
        {
            // 调用页面的 JavaScript 方法
            HtmlPage.Window.Invoke("silverlightInvokeJS", "webabcd");

            // 执行任意 JavaScript 语句
            HtmlPage.Window.Eval("silverlightInvokeJS('webabcd2')");
        }

        void JSDemo_Loaded(object sender, RoutedEventArgs e)
        {
            HtmlPage.Document.GetElementById("btnHello").SetStyleAttribute("display", "inline");

            // 将此对象注册到客户端中，所对应的客户端的对象名为 silverlightObject
            HtmlPage.RegisterScriptableObject("silverlightObject", this);
        }

        /**//// <summary>
        /// Hello 方法
        /// 暴露给页面的方法，调用后在 Silverlight 中显示结果
        /// </summary>
        /// <param name="name">名字</param>
        [ScriptableMember] // 脚本化此方法
        public void hello(string name)
        {
            txtMsg.Text += string.Format("Hello: {0}\r\n", name);
        }
    }
}

JSDemo.html

<! DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" >
< html  xmlns ="http://www.w3.org/1999/xhtml" >
< head >
     < title > Silverlight20 </ title >
     < style  type ="text/css" >
        html, body
        {}{
            height: 100%;
            overflow: auto;
        }
        body
        {}{
            padding: 0;
            margin: 0;
        }
        #silverlightControlHost
        {}{
            height: 100%;
        }
     </ style >

     < script  type ="text/javascript"  src ="../Silverlight.js" ></ script >

     < script  type ="text/javascript" >
        function silverlightInvokeJS(name) {
            // Silverlight 调用 JavaScript 方法，在页面上显示结果
            document.getElementById('result').innerHTML += "hello: " + name + "<br />";
        }

        function jsInvokeSilverlight(name) {
            // JavaScript 调用 Silverlight 方法，在 Silverlight 上显示结果
            var obj = document.getElementById("xaml1").content.silverlightObject;
            obj.hello(name);
        }
     </ script >

</ head >
< body >
     < div  style ="font-size: 12px"  id ="result" >
     </ div >
     < div  style ="font-size: 12px" >
        加载 Silverlight20.WebPage.JSDemo 后，测试 Silverlight 和页面 JavaScript 的交互  &nbsp;
         < input  type ="button"  id ="btnHello"  value ="HelloSilverlight"  onclick ="jsInvokeSilverlight('webabcd')"
            style ="display: none"   />
     </ div >
     < div  id ="silverlightControlHost" >
         < object  id ="xaml1"  data ="data:application/x-silverlight-2,"  type ="application/x-silverlight-2"
            width ="100%"  height ="100%" >
             < param  name ="source"  value ="../ClientBin/Silverlight20.xap"   />
             < param  name ="EnableHtmlAccess"  value ="true"   />
         </ object >
         < iframe  style ='visibility:  hidden; height: 0; width: 0; border: 0px' ></ iframe >
     </ div >
</ body >
</ html >