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Silverlight 2 教程(五):JavaScript与Silverlight托管代码相互调用

2009-02-19 16:47 645 查看
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

<UserControl x:Class="SilverlightApplication1.Page"

xmlns="http://schemas.microsoft.com/client/2007"

xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

Width="400" Height="300">

<Grid x:Name="LayoutRoot" Background="White">

<Canvas Canvas.Top="20">

<TextBlock Canvas.Top="10" Canvas.Left="20">请输入您的姓名: </TextBlock>

<TextBox x:Name="UserInput" Width="200" Height="30" Canvas.Top="40" Canvas.Left="20"></TextBox>

<TextBlock x:Name="Msg" Canvas.Top="90" Canvas.Left="20" Foreground="Navy" FontSize="36"></TextBlock>

<Button Click="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

using System;

using System.Collections.Generic;

using System.Linq;

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 SilverlightApplication1

{

public partial class Page : UserControl

{

public Page()

{

InitializeComponent();

}

private void Button_Click(object sender, RoutedEventArgs e)

{

string UserInputContent = 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 string InterInvole()

{

string username = 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

using System;

using System.Collections.Generic;

using System.Linq;

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 SilverlightApplication1

{

public partial class App : Application

{

public App()

{

this.Startup += this.Application_Startup;

this.Exit += this.Application_Exit;

this.UnhandledException += this.Application_UnhandledException;

InitializeComponent();

}

private void Application_Startup(object sender, StartupEventArgs e)

{

// Load the main control

Page p = new Page();

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 void Application_Exit(object sender, EventArgs e)

{

}

private void Application_UnhandledException(object sender, 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">

<html xmlns="http://www.w3.org/1999/xhtml">

<head runat="server">

<title>Silverlight 2托管代码与Javascript交互的例子</title>

<script type="text/javascript">

//<!{CDATA[

//定义全局变量:

var testVar = "孟宪会";

//定义全局函数:

function getArrayTest()

{

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";

}

}

function SetUserName()

{

alert(SilverlightPlugin.Content.SilverlightApplicationExample.InterInvole());

}

//定义Silverlight插件对象

var SilverlightPlugin = null;;

function pluginLoaded(sender)

{

SilverlightPlugin = sender.get_element();

}

//]]>

</script>

</head>

<body style="height: 100%; margin: 0;">

<form id="form1" runat="server">

<div style="border: 2px solid #EEE; margin: 20px;padding:20px">

请输入你的名字:<input id="UserName" type="text" value="" />

<input type="button" onclick="SetUserName()" value="将名字传递到 Silverlight" />

</div>

<br />

<div style="border: 2px solid #EEE;margin: 20px;">

<asp:ScriptManager ID="ScriptManager1" runat="server">

</asp:ScriptManager>

<asp:Silverlight ID="Xaml1" runat="server" OnPluginLoaded="pluginLoaded" Source="~/ClientBin/SilverlightApplication1.xap" Version="2.0" Width="400px" Height="300px" />

</div>

</form>

</body>

</html>
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