ASP.NET AJAX入门系列(2):使用ScriptManager控件

简介:



ScriptManager控件包括在ASP.NET 2.0 AJAX Extensions中,它用来处理页面上的所有组件以及页面局部更新,生成相关的客户端代理脚本以便能够在JavaScript中访问Web Service,所有需要支持ASP.NET AJAXASP.NET页面上有且只能有一个ScriptManager控件。在ScriptManager控件中我们可以指定需要的脚本库,或者指定通过JS来调用的Web Service,以及调用AuthenticationServiceProfileService,还有页面错误处理等。

 
主要内容
1 .控件概述
2 .一个简单的示例
3 .客户端脚本模式
4 .错误处理
5 Services属性
6 Scripts属性
 
一.控件概述
ScriptManager 控件包括在ASP.NET 2.0 AJAX Extensions中,它用来处理页面上的所有组件以及页面局部更新,生成相关的客户端代理脚本以便能够在JavaScript中访问Web Service,所有需要支持ASP.NET AJAXASP.NET页面上有且只能有一个ScriptManager控件。在ScriptManager控件中我们可以指定需要的脚本库,或者指定通过JS来调用的Web Service,还可以指定页面错误处理等。
使用<asp:ScriptManager/>来定义一个ScriptManager,简单的ScriptManager定义形式:
None.gif < asp:ScriptManager  ID ="ScriptManager1"  
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None.gif                   runat
="server" >
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< AuthenticationService  Path =""   />
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< ProfileService  LoadProperties =""  Path =""   />
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ExpandedBlockStart.gif      
< Scripts >
InBlock.gif
InBlock.gif        
<asp:ScriptReference/>
InBlock.gif
ExpandedBlockEnd.gif      
</ Scripts >
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< Services >
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< asp:ServiceReference  />
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</ Services >
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</ asp:ScriptManager >
ScriptManager 属性和方法如下:
 
属性/方法
描述
AllowCustomError
Web.config中的自定义错误配置区<customErrors>相联系,是否使用它,默认值为true
AsyncPostBackErrorMessage
异步回传发生错误时的自定义提示错误信息,
AsyncPostBackTimeout
异步回传时超时限制,默认值为90,单位为秒
EnablePartialRendering
是否支持页面的局部更新,默认值为True,一般不需要修改
ScriptMode
指定ScriptManager发送到客户端的脚本的模式,有四种模式:AutoInheritDebugRelease,默认值为Auto,后面会仔细说到。
ScriptPath
设置所有的脚本块的根目录,作为全局属性,包括自定义的脚本块或者引用第三方的脚本块。如果在Scripts中的<asp:ScriptReference/>标签中设置了Path属性,它将覆盖该属性。
OnAsyncPostBackError
异步回传发生异常时的服务端处理函数,在这里可以捕获一场信息并作相应的处理。
OnResolveScriptReference
指定ResolveScriptReference事件的服务器端处理函数,在该函数中可以修改某一条脚本的相关信息如路径、版本等。
 
二.一个简单的示例
这个例子其实是UpdatePanel示例,在页面中加入了日期控件和一个下拉框,根据下拉框选择的不同,日期控件背景变为不同的颜色。示例代码如下:
ExpandedBlockStart.gif <% @ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default"  %>
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None.gif 
None.gif
ExpandedBlockStart.gif
< script  runat ="server" >
InBlock.gif
InBlock.gif    
void DropDownSelection_Change(Object sender, EventArgs e)
InBlock.gif
ExpandedSubBlockStart.gif    
{
InBlock.gif
InBlock.gif        Calendar1.DayStyle.BackColor 
=
InBlock.gif
InBlock.gif            System.Drawing.Color.FromName(ColorList.SelectedItem.Value);
InBlock.gif
ExpandedSubBlockEnd.gif    }

ExpandedBlockEnd.gif
None.gif
</ script >
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< html  xmlns ="http://www.w3.org/1999/xhtml" >
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< head  id ="Head1"  runat ="server" >
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< title > ScriptManager Example </ title >
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</ head >
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< body >
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< form  id ="form1"  runat ="server" >
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< div >
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< asp:ScriptManager  ID ="ScriptManager1"  
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None.gif                               runat
="server" >
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</ asp:ScriptManager >
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< asp:UpdatePanel  ID ="UpdatePanel1"
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None.gif                             runat
="server" >
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< ContentTemplate >
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< asp:Calendar  ID ="Calendar1"  
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None.gif                                  ShowTitle
="True"
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None.gif                                  runat
="server"   />
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< div >
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None.gif                        Background:
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< br  />
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< asp:DropDownList  ID ="ColorList"  
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None.gif                                          AutoPostBack
="True"  
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None.gif                                          OnSelectedIndexChanged
="DropDownSelection_Change"
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None.gif                                          runat
="server" >
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< asp:ListItem  Selected ="True"  Value ="White" >  
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None.gif                            White 
</ asp:ListItem >
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< asp:ListItem  Value ="Silver" >  
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None.gif                            Silver 
</ asp:ListItem >
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< asp:ListItem  Value ="DarkGray" >  
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None.gif                            Dark Gray 
</ asp:ListItem >
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< asp:ListItem  Value ="Khaki" >  
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None.gif                            Khaki 
</ asp:ListItem >
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< asp:ListItem  Value ="DarkKhaki" >  D
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None.gif                            ark Khaki 
</ asp:ListItem >
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</ asp:DropDownList >
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</ div >
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</ ContentTemplate >
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</ asp:UpdatePanel >
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< br  />
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</ div >
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</ form >
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</ body >
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</ html >
 
三.客户端脚本模式
在前面我们提到了ScriptMode属性指定ScriptManager发送到客户端的脚本的模式,它有四种模式:AutoInheritDebugRelease,默认值为Auto
1 Auto:它会根据Web站点的Web.config配置文件来决定使用哪一种模式,只有当配置文件中retail属性设置为false:
None.gif < system .web >
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< deployment  retail ="false"   />
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</ system.web >
或者页面中的 Debug指令设为 true的时候会使用 Debug版本,其他的情况都会使用 Release版本。
None.gif < %@ Page  Language ="C#"  Debug ="true"
None.gif
None.gifAutoEventWireup
="true"  CodeFile ="Default.aspx.cs"  Inherits ="_Default"  % >
2 Inherit:应该是通过程序设置ScriptMode的时候,等同于Auto?(不太了解)
3 Debug:客户端脚本使用Debug版本,除非retail属性设为true
4 Release:客户端脚本使用Release版本,除非retail属性设为false
 
四.错误处理
在页面回传时如果发生了异常AsyncPostBackError事件将被触发,错误信息的处理依赖于AllowCustomErrors属性、AsyncPostBackErrorMessage属性和Web.config中的<customErrors>配置区。下面看一个简单的错误处理例子,在AsyncPostBackError事件中捕获到异常信息并设置AsyncPostBackErrorMessage属性。
ExpandedBlockStart.gif <% @ Page Language="C#"  %>
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ExpandedBlockStart.gif
< script  runat ="server" >
InBlock.gif
InBlock.gif    protected 
void ErrorProcessClick_Handler(object sender, EventArgs e)
InBlock.gif
ExpandedSubBlockStart.gif    
{
InBlock.gif        
// This handler demonstrates an error condition. In this example
InBlock.gif

InBlock.gif        
// the server error gets intercepted on the client and an alert is shown. 
InBlock.gif

InBlock.gif        
throw new ArgumentException();
ExpandedSubBlockEnd.gif    }

InBlock.gif
InBlock.gif    protected 
void SuccessProcessClick_Handler(object sender, EventArgs e)
InBlock.gif
ExpandedSubBlockStart.gif    
{
InBlock.gif        
// This handler demonstrates no server side exception.
InBlock.gif

InBlock.gif        UpdatePanelMessage.Text 
= "The asynchronous postback completed successfully.";
InBlock.gif
ExpandedSubBlockEnd.gif    }

InBlock.gif
InBlock.gif    protected 
void ScriptManager1_AsyncPostBackError(object sender, AsyncPostBackErrorEventArgs e)
InBlock.gif
ExpandedSubBlockStart.gif    
{
InBlock.gif        ScriptManager1.AsyncPostBackErrorMessage 
= "异常信息为:" + e.Exception.Message;
InBlock.gif
ExpandedSubBlockEnd.gif    }

ExpandedBlockEnd.gif
None.gif
</ script >
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< html  xmlns ="http://www.w3.org/1999/xhtml" >
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< head  id ="Head1"  runat ="server" >
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< title > PageRequestManager endRequestEventArgs Example </ title >
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ExpandedBlockStart.gif    
< style  type ="text/css" >
InBlock.gif
ExpandedSubBlockStart.gif    body 
{
InBlock.gif
InBlock.gif        font-family
: Tahoma;
InBlock.gif
ExpandedSubBlockEnd.gif    
}

InBlock.gif
ExpandedSubBlockStart.gif    #AlertDiv
{
InBlock.gif
InBlock.gif    left
: 40%; top: 40%;
InBlock.gif
InBlock.gif    position
: absolute; width: 200px;
InBlock.gif
InBlock.gif    padding
: 12px; 
InBlock.gif
InBlock.gif    border
: #000000 1px solid;
InBlock.gif
InBlock.gif    background-color
: white; 
InBlock.gif
InBlock.gif    text-align
: left;
InBlock.gif
InBlock.gif    visibility
: hidden;
InBlock.gif
InBlock.gif    z-index
: 99;
InBlock.gif
ExpandedSubBlockEnd.gif    
}

InBlock.gif
ExpandedSubBlockStart.gif    #AlertButtons
{
InBlock.gif
InBlock.gif    position
: absolute;
InBlock.gif
InBlock.gif    right
: 5%;
InBlock.gif
InBlock.gif    bottom
: 5%;
InBlock.gif
ExpandedSubBlockEnd.gif    
}

InBlock.gif
ExpandedBlockEnd.gif    
</ style >
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</ head >
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< body  id ="bodytag" >
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< form  id ="form1"  runat ="server" >
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< div >
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< asp:ScriptManager  ID ="ScriptManager1"  runat ="server"  
None.gif            OnAsyncPostBackError
="ScriptManager1_AsyncPostBackError" >
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</ asp:ScriptManager >
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ExpandedBlockStart.gif            
< script  type ="text/javascript"  language ="javascript" >
InBlock.gif
InBlock.gif                
var divElem = 'AlertDiv';
InBlock.gif
InBlock.gif                
var messageElem = 'AlertMessage';
InBlock.gif
InBlock.gif                
var errorMessageAdditional = 'Please try again.';
InBlock.gif
InBlock.gif                
var bodyTag = 'bodytag';
InBlock.gif                Sys.WebForms.PageRequestManager.getInstance().add_endRequest(EndRequestHandler);
InBlock.gif
InBlock.gif                
function ToggleAlertDiv(visString)
ExpandedSubBlockStart.gif                
{
InBlock.gif                     
if (visString == 'hidden')
InBlock.gif
ExpandedSubBlockStart.gif                     
{
InBlock.gif                         $get(bodyTag).style.backgroundColor 
= 'white';                         
ExpandedSubBlockEnd.gif                     }

InBlock.gif                     
else
ExpandedSubBlockStart.gif                     
{
InBlock.gif                         $get(bodyTag).style.backgroundColor 
= 'gray';                         
InBlock.gif
ExpandedSubBlockEnd.gif                     }

InBlock.gif
InBlock.gif                     
var adiv = $get(divElem);
InBlock.gif
InBlock.gif                     adiv.style.visibility 
= visString;
InBlock.gif
ExpandedSubBlockEnd.gif                }

InBlock.gif
ExpandedSubBlockStart.gif                
function ClearErrorState() {
InBlock.gif
InBlock.gif                     $get(messageElem).innerHTML 
= '';
InBlock.gif
InBlock.gif                     ToggleAlertDiv('hidden');                     
InBlock.gif
ExpandedSubBlockEnd.gif                }

InBlock.gif                
function EndRequestHandler(sender, args)
InBlock.gif
ExpandedSubBlockStart.gif                
{
InBlock.gif                   
if (args.get_error() != undefined && args.get_error().httpStatusCode == '500')
ExpandedSubBlockStart.gif                   
{
InBlock.gif
InBlock.gif                       
var errorMessage = args.get_error().message
InBlock.gif
InBlock.gif                       args.set_errorHandled(
true);
InBlock.gif
InBlock.gif                       ToggleAlertDiv('visible');
InBlock.gif
InBlock.gif                       $get(messageElem).innerHTML 
= '"' + 
InBlock.gif
InBlock.gif                                errorMessage + '
" ' + errorMessageAdditional;
InBlock.gif
ExpandedSubBlockEnd.gif                   }

InBlock.gif
ExpandedSubBlockEnd.gif                }

InBlock.gif
ExpandedBlockEnd.gif            
</ script >
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< asp:UpdatePanel  runat ="Server"  UpdateMode ="Conditional"  ID ="UpdatePanel1" >
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< ContentTemplate >
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< asp:Panel  ID ="Panel1"  runat ="server"  GroupingText ="Update Panel" >
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< asp:Label  ID ="UpdatePanelMessage"  runat ="server"   />
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< br  />
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None.gif                        Last update:
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<% =  DateTime.Now.ToString()  %>
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None.gif                        .
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< br  />
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< asp:Button  runat ="server"  ID ="Button1"  Text ="Submit Successful Async Postback"
None.gif
None.gif                            OnClick
="SuccessProcessClick_Handler"  OnClientClick ="ClearErrorState()"   />
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< asp:Button  runat ="server"  ID ="Button2"  Text ="Submit Async Postback With Error"
None.gif
None.gif                            OnClick
="ErrorProcessClick_Handler"  OnClientClick ="ClearErrorState()"   />
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< br  />
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</ asp:Panel >
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</ ContentTemplate >
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</ asp:UpdatePanel >
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< div  id ="AlertDiv" >
None.gif
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< div  id ="AlertMessage" >
None.gif
None.gif                
</ div >
None.gif
None.gif                
< br  />
None.gif
None.gif                
< div  id ="AlertButtons"   >
None.gif
None.gif                    
< input  id ="OKButton"  type ="button"  value ="OK"  
None.gif
None.gif                           runat
="server"  onclick ="ClearErrorState()"   />
None.gif
None.gif                
</ div >
None.gif
None.gif           
</ div >
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None.gif    
</ form >
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None.gif
</ body >
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</ html >
运行后时界面:
发生异常信息:
 
五.Services属性
Services 用来管理对WebService的调用,通过<asp:ServiceReference>标签可以在Services中注册一个WebService,在运行时ScriptManager将为每一个ServiceReference对象生成一个客户端代理,<asp:ServiceReference>标签一个很重要的属性是Path,用来指定WebService的路径,如下所示:
None.gif < asp:ScriptManager  ID ="SM1"  runat ="server" >
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< Services >
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< asp:ServiceReference  Path ="Service.asmx" />
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</ Services >
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</ asp:ScriptManager >
看一个简单的调用 WebService的例子:
WebService 如下,注意在WebServiceSample上加ScriptService特性:
None.gif [ScriptService]
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ExpandedBlockStart.gif
public   class  WebServiceSample : System.Web.Services.WebService  {
InBlock.gif
InBlock.gif    
public WebServiceSample()
InBlock.gif
ExpandedSubBlockStart.gif    
{
InBlock.gif
InBlock.gif        
//Uncomment the following line if using designed components 
InBlock.gif
InBlock.gif        
//InitializeComponent(); 
InBlock.gif

ExpandedSubBlockEnd.gif    }

InBlock.gif
InBlock.gif
InBlock.gif    [WebMethod]
InBlock.gif
InBlock.gif    
public string EchoString(String s)
InBlock.gif
ExpandedSubBlockStart.gif    
{
InBlock.gif        
return "Hello " + s;
ExpandedSubBlockEnd.gif    }

InBlock.gif
ExpandedBlockEnd.gif}
ASPX 页面:
ExpandedBlockStart.gif <% @ Page Language="C#" AutoEventWireup="true" CodeFile="Default3.aspx.cs" Inherits="Default3"  %>
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None.gif
< html  xmlns ="http://www.w3.org/1999/xhtml"   >
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< head  runat ="server" >
None.gif
None.gif    
< title > Untitled Page </ title >
None.gif
None.gif
</ head >
None.gif
ExpandedBlockStart.gif
< script  type ="text/javascript"  language ="JavaScript" >
InBlock.gif
InBlock.gif    
function OnbuttonGo_click() 
InBlock.gif
ExpandedSubBlockStart.gif    
{
InBlock.gif        requestSimpleService 
= WebServiceSample.EchoString(
InBlock.gif
InBlock.gif            document.getElementById('inputName').value,       
//params
InBlock.gif

InBlock.gif            OnRequestComplete    
//Complete event
InBlock.gif

InBlock.gif            );
InBlock.gif
InBlock.gif        
return false;
ExpandedSubBlockEnd.gif    }

InBlock.gif
InBlock.gif    
function OnRequestComplete(result) 
InBlock.gif
ExpandedSubBlockStart.gif    
{
InBlock.gif        alert(result);
ExpandedSubBlockEnd.gif    }

ExpandedBlockEnd.gif
None.gif
</ script >
None.gif
None.gif
< body >
None.gif
None.gif    
< form  id ="form1"  runat ="server" >
None.gif
None.gif    
< asp:ScriptManager  ID ="ScriptManager1"  runat ="server" >
None.gif
None.gif        
< Services >
None.gif
None.gif            
< asp:ServiceReference  Path ="WebServiceSample.asmx" />
None.gif
None.gif        
</ Services >
None.gif
None.gif    
</ asp:ScriptManager >
None.gif
None.gif    
< div >
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None.gif        
< input  type ="text"  id ="inputName"  size =20 />
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None.gif        
< input  id ="button"  type ="button"  value ="调 用"  onclick ="return OnbuttonGo_click()"   /></ div >
None.gif
None.gif    
</ form >
None.gif
None.gif
</ body >
None.gif
None.gif
</ html >
运行后效果如下:
当然了也可以在运行时动态的在Services中加入ServiceReference,下面看一个运行时动态加入ServiceReference的例子:
ExpandedBlockStart.gif <% @ Page Language="C#" AutoEventWireup="true" CodeFile="Default3.aspx.cs" Inherits="Default3"  %>
None.gif
ExpandedBlockStart.gif
< script  runat ="server" >
InBlock.gif
InBlock.gif    
void Page_Load(object sender, EventArgs e)
InBlock.gif
ExpandedSubBlockStart.gif    
{
InBlock.gif
InBlock.gif        ServiceReference sr 
= new ServiceReference();
InBlock.gif
InBlock.gif        sr.Path 
= "WebServiceSample.asmx";
InBlock.gif
InBlock.gif        ScriptManager1.Services.Add(sr);
InBlock.gif
ExpandedSubBlockEnd.gif    }

ExpandedBlockEnd.gif
None.gif
</ script >
None.gif
None.gif
< html  xmlns ="http://www.w3.org/1999/xhtml"   >
None.gif
None.gif
< head  runat ="server" >
None.gif
None.gif    
< title > Untitled Page </ title >
None.gif
None.gif
</ head >
None.gif
ExpandedBlockStart.gif
< script  type ="text/javascript"  language ="JavaScript" >
InBlock.gif
InBlock.gif    
function OnbuttonGo_click() 
InBlock.gif
ExpandedSubBlockStart.gif    
{
InBlock.gif
InBlock.gif        requestSimpleService 
= WebServiceSample.EchoString(
InBlock.gif
InBlock.gif            document.getElementById('inputName').value,       
//params
InBlock.gif

InBlock.gif            OnRequestComplete    
//Complete event
InBlock.gif

InBlock.gif            );
InBlock.gif
InBlock.gif        
return false;
InBlock.gif
ExpandedSubBlockEnd.gif    }

InBlock.gif
InBlock.gif 
InBlock.gif
InBlock.gif    
function OnRequestComplete(result) 
InBlock.gif
ExpandedSubBlockStart.gif    
{
InBlock.gif
InBlock.gif        alert(result);
InBlock.gif
ExpandedSubBlockEnd.gif    }

ExpandedBlockEnd.gif
None.gif
</ script >
None.gif
None.gif 
None.gif
None.gif
< body >
None.gif
None.gif    
None.gif
None.gif    
< form  id ="form1"  runat ="server" >
None.gif
None.gif    
< asp:ScriptManager  ID ="ScriptManager1"  runat ="server" >
None.gif
None.gif    
</ asp:ScriptManager >
None.gif
None.gif    
< div >
None.gif
None.gif        
< input  type ="text"  id ="inputName"  size =20 />
None.gif
None.gif        
< input  id ="button"  type ="button"  value ="调 用"  onclick ="return OnbuttonGo_click()"   /></ div >
None.gif
None.gif    
</ form >
None.gif
None.gif
</ body >
None.gif
None.gif
</ html >
可以看到运行后和在 ScriptManager中直接加入的效果是一样的。
 
六.Scripts属性
关于Scripts属性到后面具体再说吧,最主要的属性有Path指定脚本的路径,ScriptMode指定客户端脚本的模式,它会覆盖ScriptManager中的ScriptMode属性,还有一个属性是IgnoreScriptPath,指定是否忽略掉ScriptManager中的ScriptPath属性。
关于ScriptManager控件就学习到这里了,至于AuthenticationService属性和ProfileService属性都很简单。










本文转自lihuijun51CTO博客,原文链接:  http://blog.51cto.com/terrylee/67708 ,如需转载请自行联系原作者

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