Beginning Ajax With ASP.NET (2006).pdf

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What Is Built into ASP.NET How It Works Here you have a list of books, their descriptions, and a comment associated with each one. The GridView will render the list of books for the user to browse through. By default, sorting and paging is not enabled on the GridView control, so all the book entries are displayed on the web page. In many cases, paging is enabled to allow a smaller list of content to be displayed at any one time, but also to allow the user to advance that window or page to view more entries within the list. In this example, you have enabled paging by setting the AllowPaging property of the control to true. The GridView control also contains a PageSize property that determines how many entries are displayed per page when paging is enabled. By default this is 10, which is what this example uses. When paging is enabled, the GridView displays a paging navigation bar at the bottom of the control to allow the user to select a different page to view. By default, when a new page is selected by the user, the GridView causes a postback to occur, so that the data for the next page can be retrieved by the server. In the example, you will note that you set the EnableSortingAndPagingCallbacks property to true, and this is what is required to enable asynchronous callbacks for the GridView control. With this property enabled, each time the user clicks on the paging navigation bar to view a different page of data, no postback occurs, but rather an asynchronous callback is executed to perform this work on the server and return the results. The new page is then dynamically updated within the GridView control on the browser. It may now be more apparent why this property is not enabled by default. The EnableSortingAnd PagingCalbacks property is applicable only if paging and/or sorting is enabled within the GridView control, and this functionality is not enabled by default. Therefore, enabling the EnableSortingAnd PagingCalbacks property by default would make no sense. 131
Chapter 6 DetailsView Control The DetailsView control also has very similar functionality to the GridView control. As with the GridView control, client-side callback functionality for the DetailsView control is initially disabled. If paging is enabled on the control, then the AllowPagingCallbacks property can be set to true to cause the control to execute its server-side paging functionality asynchronously from the browser. Browser Compatibility Microsoft has learned from its lessons of the past, and good cross-browser compatibility is one of the main goals of ASP.NET 2.0. All of the samples shown previously work across a majority of fifth generation browsers, such as Internet Explorer 5.x and above, Mozilla/Netscape 6.x and above, Safari 1.2x, Opera 7.x, and Firefox. From an application development perspective, it is also very easy to check whether the browser currently accessing your application supports asynchronous client-side callbacks. There are two new boolean properties of the Browser object that are part of the request. These are the SupportsCallback and SupportsXmlHttp properties, and they indicate if the requesting browser supports asynchronous client callbacks and use of XMLHttpRequest object, respectively. They are part of the property collection of the Browser object, which itself is part of the Request object, and so can be accessed using the syntax Request.Browser.SupportsCallback and Request.Browser.SupportsXmlHttp. The properties can be easily examined to determine if the requesting browser supports the desired functionality, as shown in the following Try It Out. Try It Out Determining Client-Side Callback Support Using Server-Side Code protected void Page_Load(object sender, EventArgs e) { if (Request.Browser.SupportsCallback) lblCallbackMsg.Text = “This browser supports client side callbacks.”; else lblCallbackMsg.Text = “This browser DOES NOT support client side callbacks.”; if (Request.Browser.SupportsXmlHttp) lblXmlHttpMsg.Text = “This browser supports XmlHttp (receiving XML over HTTP).”; else lblXmlHttpMsg.Text = “This browser DOES NOT XmlHttp (receiving XML over HTTP).”; } How It Works The Request object (which is of type System.Web.HttpRequest) that is available to all pages has a Browser property (which is of type System.Web.HttpBrowserCapabilities) where you access the boolean properties SupportsCallback and SupportsXmlHttp. 132
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Beginning Ajax with ASP.NET Wallace
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Beginning Ajax with ASP.NET Wallace
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Executive Editor Bob Elliott Senior
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About the Authors Wallace B. “Wal
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Acknowledgments It is truly interes
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Contents Manipulating the Style She
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Contents Chapter 7: Ajax.NET Profes
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Contents Chapter 11: Atlas Controls
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Introduction Thank you for purchasi
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Tips, hints, tricks, and asides to
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1 Introduction to Ajax on ASP.NET O
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Introduction to Ajax on ASP.NET Mic
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Introduction to Ajax on ASP.NET ❑
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Introduction to Ajax on ASP.NET ❑
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Who’s Using Ajax? Introduction to
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2 Introduction to DHTML Dynamic HTM
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Writing Your First Block of JavaScr
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Introduction to DHTML document.writ
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Introduction to DHTML Figure 2-3 Ex
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Introduction to DHTML The return ke
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Introduction to DHTML var isArrowLe
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Using the innerHTML Property Introd
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To illustrate this behavior, the ne
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Introduction to DHTML Now that you
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Chapter 3 From Static to Dynamic
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Chapter 3 Within the section of th
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Chapter 3 Just a reminder of what w
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Chapter 3 /* */ Datatypes These are
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Chapter 3 Composite types are requi
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Chapter 3 These sets of operators a
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Chapter 3 var y = 0; do { y = y + 1
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Chapter 3 Figure 3-1 shows the resu
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Chapter 3 This allows you to assign
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Chapter 3 Because the constructor i
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Chapter 3 This produces the result
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Chapter 3 window navigator location
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Chapter 3 There are four levels of
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Chapter 3 var featuresLevel1 = [“
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Chapter 3 Take a look at a simple e
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Chapter 3 For this particular examp
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Chapter 3 The method getElementById
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Chapter 3 Cloning a Node This
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Chapter 3 Node Type Type Descriptio
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Chapter 3 Figure 3-7 Figure 3-8 68
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Chapter 3 The DOM, Styles, and CSS
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Chapter 3 Try It Out Modifying a St
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Chapter 3 which includes a script f
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4 The XMLHttpRequest Object The XML
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The XMLHttpRequest Object above, Op
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Page 124 and 125: The XMLHttpRequest Object xmlHttpOb
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Page 128 and 129: 5 Data Communication: XML, XSLT, an
Page 130 and 131: 1986 by ISO standard “ISO 8879:19
Page 132 and 133: Consider the following code sample
Page 134 and 135: Data Communication: XML, XSLT, and
Page 146 and 147: X Path Data Communication: XML, XSL
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Page 160 and 161: method. This method allows a develo
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Page 166 and 167: What Is Built into ASP.NET // Get o
Page 168 and 169: What Is Built into ASP.NET using Sy
Page 170 and 171: What Is Built into ASP.NET Value S
Page 172 and 173: DataSet object with some data and s
Page 174 and 175: Dealing with the Returned Data on t
Page 176 and 177: What Is Built into ASP.NET // Add t
Page 178 and 179: What Is Built into ASP.NET } names.
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Page 182: explicit server-side coding is requ
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Page 187 and 188: Chapter 7 The server-side code that
Page 189 and 190: Chapter 7 So, your entire server-si
Page 191 and 192: Chapter 7 What Is a Language Proxy?
Page 193 and 194: Chapter 7 Using strings will get yo
Page 195 and 196: Chapter 7 the name and street prope
Page 197 and 198: Chapter 7 Chapter7_ImageSwitcherCal
Page 199 and 200: Chapter 7 Checking for Null Values
Page 201 and 202: Chapter 7 The fourth script source
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Anatomy of Ajax.NET Pro Library Fig
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Anatomy of Ajax.NET Pro Library Mas
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Line 25 creates the actual JavaScri
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Anatomy of Ajax.NET Pro Library 09.
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Anatomy of Ajax.NET Pro Library 19.
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Anatomy of Ajax.NET Pro Library 105
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What Is an Ajax.NET Pro Converter?
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9 Other Ajax Frameworks for .NET Aj
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Testing for Features Using the Sari
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Attaching an event to check for the
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The framework contains supporting c
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Other Ajax Frameworks for .NET lock
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Panels versus Custom Controls Once
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Other Ajax Frameworks for .NET cust
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Creating the Solution 1. Open Visua
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Other Ajax Frameworks for .NET Not
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Other Ajax Frameworks for .NET Swit
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Other Ajax Frameworks for .NET Figu
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Other Ajax Frameworks for .NET Imag
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Other Ajax Frameworks for .NET } }
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Other Ajax Frameworks for .NET feat
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Other Ajax Frameworks for .NET bord
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txtTitle_TextChanged event and will
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Other Ajax Frameworks for .NET Fina
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Other Ajax Frameworks for .NET
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Other Ajax Frameworks for .NET Fina
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Other Ajax Frameworks for .NET cont
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Other Ajax Frameworks for .NET The
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Other Ajax Frameworks for .NET back
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On the server side, ComfortASP.NET
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Chapter 10 ❑ Client-side componen
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Chapter 10 Now that you have heard
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Chapter 10 This code shows how an e
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Chapter 10 OnServerException Examin
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Chapter 10 } function ServerAddRetu
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Chapter 10 DataRow var strRowsInfo
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Chapter 10 { } return (objComplexCu
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Chapter 10 New Time:
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Chapter 10 function CallInternalWe
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Chapter 10 Number The Number class
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Chapter 10 The Sys.Data.DataColumn
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Chapter 10 The following is some co
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Chapter 10 NamespaceName.ClassName.
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Chapter 10 Inheritance Inheritance
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Chapter 10 Try It Out Implementing
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Chapter 10 Figure 10-14 Enumeration
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Chapter 10 Figure 10-16 282
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Chapter 10 Summary In this chapter,
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Chapter 11 var associatedElement =
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Chapter 11 Setting the EnablePartia
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Chapter 11 Just to show that there
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Chapter 11 How It Works In this exa
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Chapter 11 Now that you have seen t
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Chapter 11 Try It Out You will noti
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Chapter 11 listView.set_layoutTempl
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Chapter 11 Binding Directions As pr
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Chapter 11 3. The validationErrorLa
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Chapter 11 Regex Validation Exam
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Chapter 11
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Chapter 11 Hide Show
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12 Atlas Integration with ASP.NET S
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Atlas Integration with ASP.NET Serv
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❑ ❑ ScriptFolder — In this co
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Try It Out Retrieving Profile Prope
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❑ A special connectionString is u
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13 Debugging Debugging is the art o
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Debugging Figure 13-2 In either cas
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Using Alert Statements Starting wit
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Try It Out Client-Side Script Debug
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Debugging Figure 13-9 4. In the Scr
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Debugging Figure 13-12 Right-clicki
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So far, you have used F10 to advanc
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Debugging Debugger Keyword Test Pa
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Debugging Figure 13-16 Try It Out U
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Debugging The Command window will h
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Debugging Although this section of
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install the Venkman tool within Fir
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Debugging true); xmlHttpObj.open(
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Debugging TestFiddler.aspx.cs — C
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Debugging Figure 13-25 This is usef
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Debugging using System.Collections;
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Debugging Replace the text button%2
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A XSLT Commands This appendix provi
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XSLT Commands Element preserve-spac
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Boolean XSLT Commands The boolean f
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XSLT Commands Name adjust-dateTime-
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XSLT Commands Name Description subs
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Index
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AjaxPro.AjaxMethod() attribute Ajax
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attributes (continued) attributes (
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Command window Command window, 346-
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document-uri(node) function (XSLT)
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frameworks frameworks Ajax.NET Pro
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functions (XSLT) (continued) functi
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JavaScript (continued) JavaScript (
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libraries (continued) libraries (co
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methods (XSLT) (continued) methods
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Microsoft Atlas project (continued)
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port port 80, 103 port numbers in c
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server-side frameworks (continued)
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value-of element (XSLT) value-of el
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XSLT elements (continued) XSLT elem
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