JavaScript与Silverlight托管代码相互调用

来源：互联网发布：php transaction 编辑：程序博客网时间：2024/05/01 16:03

要实现JavaScript调用Silverlight程序里面的托管代码，需要先在应用程序的启动（Application_Startup）事件里注册要进行访问的对象，而要从Silverlight的托管代码里访问HTML页面对象或者页面中的JavaScript，使用HtmlPage的Document/HtmlElement和HtmlWindow即可。
下面，我们就以例子来说明两者相互访问的方法，代码里面有很详细的注释，这里不再累述。

Page.xaml：

<UserControlx:Class="SilverlightApplication1.Page"
xmlns="http://schemas.microsoft.com/client/2007"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Width="400"Height="300">
<Gridx:Name="LayoutRoot"Background="White">
<CanvasCanvas.Top="20">
<TextBlockCanvas.Top="10"Canvas.Left="20">请输入您的姓名：</TextBlock>
<TextBoxx:Name="UserInput"Width="200"Height="30"Canvas.Top="40"Canvas.Left="20"></TextBox>
<TextBlockx:Name="Msg"Canvas.Top="90"Canvas.Left="20"Foreground="Navy"FontSize="36"></TextBlock>
<ButtonClick="Button_Click"Content="单击我"FontSize="24"Width="160"Height="60"x:Name="BtnTest"Canvas.Top="160"Canvas.Left="20"></Button>
</Canvas>
</Grid>
</UserControl>

Page.xaml.cs：

usingSystem;
usingSystem.Collections.Generic;
usingSystem.Linq;
usingSystem.Windows;
usingSystem.Windows.Controls;
usingSystem.Windows.Documents;
usingSystem.Windows.Input;
usingSystem.Windows.Media;
usingSystem.Windows.Media.Animation;
usingSystem.Windows.Shapes;
usingSystem.Windows.Browser;

namespaceSilverlightApplication1
{
public
partial
classPage : UserControl
{
      publicPage()
      {
         InitializeComponent();
      }

      private
voidButton_Click(objectsender, RoutedEventArgs e)
      {
         stringUserInputContent=
this.UserInput.Text;
         if(UserInputContent.Equals(String.Empty))
         {
            UserInputContent=
"Hello Silverlight World!";
         }
         else
         {
            UserInputContent=
"你好，"
+UserInputContent;
         }
         HtmlWindow win=HtmlPage.Window;
         this.Msg.Text=UserInputContent;
         win.Alert("Silverlight 里面弹出的对话框。"
+UserInputContent);
         //执行页面中的js函数：
         win.Eval("getArrayTest()");
         Object[] args={"将此参数传递给 js 函数"};
         win.Invoke("getArrayTest", args);
         //如果页面中的值
         HtmlDocument doc=HtmlPage.Document;
         doc.GetElementById("UserName").SetAttribute("value",this.UserInput.Text);
      }

      [ScriptableMember()]
      public
stringInterInvole()
      {
         stringusername=HtmlPage.Document.GetElementById("UserName").GetAttribute("value");
         this.UserInput.Text=username;
         this.Msg.Text=
"您输入了："
+username;
         return
"你从js脚本中调用了 Silverlight 里面的方法。";
      }
}
}

App.xaml.cs：

usingSystem;
usingSystem.Collections.Generic;
usingSystem.Linq;
usingSystem.Windows;
usingSystem.Windows.Controls;
usingSystem.Windows.Documents;
usingSystem.Windows.Input;
usingSystem.Windows.Media;
usingSystem.Windows.Media.Animation;
usingSystem.Windows.Shapes;
usingSystem.Windows.Browser;

namespaceSilverlightApplication1
{
public
partial
classApp : Application
{

      publicApp()
      {
         this.Startup+=
this.Application_Startup;
         this.Exit+=
this.Application_Exit;
         this.UnhandledException+=
this.Application_UnhandledException;

         InitializeComponent();
      }

      private
voidApplication_Startup(objectsender, StartupEventArgs e)
      {
         //Load the main control
         Page p=
newPage();
         HtmlPage.RegisterScriptableObject("SilverlightApplicationExample", p);

         //请注意这里的定义方法，如果这里的p写成 new Page()，则Javascript基本不能给 UserInput 赋值！

this.RootVisual=p;
      }

      private
voidApplication_Exit(objectsender, EventArgs e)
      {

      }
      private
voidApplication_UnhandledException(objectsender, ApplicationUnhandledExceptionEventArgs e)
      {

      }
}
}

SilverlightApplication1TestPage.aspx：

<%@ Page Language="C#"AutoEventWireup="true"
%>
<%@ Register Assembly="System.Web.Silverlight"Namespace="System.Web.UI.SilverlightControls"TagPrefix="asp"
%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<htmlxmlns="http://www.w3.org/1999/xhtml">
<headrunat="server">
<title>Silverlight 2托管代码与Javascript交互的例子</title>
<scripttype="text/javascript">
//<!{CDATA[

//定义全局变量：

vartestVar=
"孟宪会";

//定义全局函数：

functiongetArrayTest()
{
  if(arguments.length>
0)
  {
alert("js 对话框：您传递了参数。"
+arguments[0]);
return  arguments[0];
  }
  else
  {
alert("js 对话框：无参数调用。");
return
"js 函数返回值";
  }
}

functionSetUserName()
{
  alert(SilverlightPlugin.Content.SilverlightApplicationExample.InterInvole());
}

//定义Silverlight插件对象
varSilverlightPlugin=
null;;
functionpluginLoaded(sender)
{
SilverlightPlugin=sender.get_element();
}
//]]>

</script>
</head>
<bodystyle="height: 100%; margin: 0;">
<formid="form1"runat="server">
<divstyle="border: 2px solid #EEE; margin: 20px;padding:20px">
  请输入你的名字：<inputid="UserName"type="text"value=""
/>
<inputtype="button"onclick="SetUserName()"value="将名字传递到 Silverlight"
/>
</div>
<br/>
<divstyle="border: 2px solid #EEE;margin: 20px;">
<asp:ScriptManagerID="ScriptManager1"runat="server">
</asp:ScriptManager>
<asp:SilverlightID="Xaml1"runat="server"OnPluginLoaded="pluginLoaded"Source="~/ClientBin/SilverlightApplication1.xap"Version="2.0"Width="400px"Height="300px"
/>
</div>
</form>
</body>
</html>

运行结果：