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="User@R_301_5983@" 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.@R_301_5983@;
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 User@R_301_5983@Content = this.User@R_301_5983@.Text;
if (User@R_301_5983@Content.Equals(String.Empty))
{
User@R_301_5983@Content = "Hello Silverlight World!";
}
else
{
User@R_301_5983@Content = "你好," + User@R_301_5983@Content;
}
HTMLWindow win = HTMLPage.Window;
this.Msg.Text = User@R_301_5983@Content;
win.Alert("Silverlight 里面d出的对话框。 " + User@R_301_5983@Content);
//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.User@R_301_5983@.Text);
}
[ScriptableMember()]
public string InterInvole()
{
string username = HTMLPage.document.GetElementByID("Username").GetAttribute("value");
this.User@R_301_5983@.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.@R_301_5983@;
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 User@R_301_5983@ 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:<@R_301_5983@ ID="Username" type="text" value="" />
<@R_301_5983@ 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>
运行结果:
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