Beginning Ajax With ASP.NET (2006).pdf

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Introduction to Ajax on ASP.NET ❑ ❑ Responsiveness — Because Ajax applications are asynchronous on the client, they are perceived to be very responsive. Context — With a full postback, the user may lose the context of where they are. The user may be at the bottom of a page, hit the Submit button, and be redirected back to the top of the page. With Ajax there is no full postback. Clicking the Submit button in an application that uses Ajax will allow the user to maintain their location. The user state is maintained, and the user is no longer required to scroll down to the location that he or she was at before clicking Submit. Figure 1-4 shows how the user interface can still operate while using Ajax. The UI is not locked during the server processing. User Action User Action User Action Server Response Server Response Figure 1-4 History of Ajax For all of its perceived newness and sexiness, the technologies that make up Ajax are really not new. The ability to communicate back to the server through a hidden frame without posting the main page back to the server has been around for a long time. Communication between client and server has been available — back to the release of Internet Explorer’s ability to script ActiveX controls on the client browser and to the MSXML component, both of which date back into the late 1990s. Personally, I saw the first formal usage of client script and MSXML in 2003. The problem with the technology at that time was the need to manually create the necessary client-side JavaScript. In 2003, there was too much code overall that had to be written and too much custom code that had to be written to get this to work. It has been only in the second half of 2005 that client-side libraries and server-side support for ASP.NET have started to make their presence felt and been used significantly. The mainstream development community has only recently started using the technique. The release of Google’s Suggest and Maps are what really opened the eyes of the users to the development technologies. These applications sent a shockwave through the development community. 7
Chapter 1 Technologies That Make Up Ajax Ajax is a general umbrella term. As mentioned earlier, Ajax itself stands for Asynchronous JavaScript And XML. The term Ajax was actually coined by Jesse James Garret of Adaptive Path in an essay that was published in February 2005 (www.adaptivepath.com/publications/essays/archives/ 000385.php) and was quickly accepted by the development community. Based on this general umbrella term, take a look at the specific items that make up Ajax: ❑ ❑ ❑ ❑ XmlHttpRequest — XmlHttpRequest allows the browser to communicate to a back-end server. This object allows the browser to talk to the server without requiring a postback of the entire web page. With Internet Explorer, this capability is provided by the MSXML ActiveX component. With the Mozilla Firefox and other web browsers, this capability is provided by an object literally called XmlHttpRequest. The XmlHttpRequest object is modeled after the MSXML component. The client-side JavaScript libraries hide the differences between the various browser environments. Sometimes these communications are done through a hidden FRAME or IFRAME. JavaScript — JavaScript provides the capabilities to communicate with the back-end server. The JavaScript must be version 1.5 or later. Although JavaScript is not specifically required, it is needed from the standpoint that JavaScript is the only client-side scripting environment supported across the major modern web browsers. There are other client script languages; however, these are not supported across all browsers. DHTML/DOM support — The browser must support the ability to dynamically update form elements, and the ability to do this in a standard way comes through the support for the Document Object Model (DOM). By supporting the DOM, it becomes easy for developers to write a single piece of code that targets multiple browsers. Data transport with XML or JSON — Using XML allows for the ability to communicate with the web server in a standard mechanism. There are situations where the JavaScript Object Notation (JSON) is used as the communication notation instead of straight XML. Running Ajax Applications Unfortunately, not all web browsers ever produced will support Ajax. To run Ajax, a web browser must: ❑ ❑ ❑ ❑ ❑ Be relatively modern. Ajax style applications are not available in all versions of all web browsers. Whereas Internet Explorer version 6, Firefox version 1.5, and Opera 8.5 provide support for these applications, older versions may be problematic because of their support for different versions of the other requirements. Support DOM. Utilize JavaScript. Support Extensible Markup Language (XML) and Extensible Style Language Transformation (XSLT). Possibly have ActiveX enabled on the client. If you are using the Internet Explorer browser while running on Windows, you may have problems if ActiveX is not enabled. 8
Page 2: Beginning Ajax with ASP.NET Wallace
Page 6 and 7: Beginning Ajax with ASP.NET Wallace
Page 8 and 9: Executive Editor Bob Elliott Senior
Page 10 and 11: About the Authors Wallace B. “Wal
Page 12: Acknowledgments It is truly interes
Page 15 and 16: Contents Manipulating the Style She
Page 17 and 18: Contents Chapter 7: Ajax.NET Profes
Page 19 and 20: Contents Chapter 11: Atlas Controls
Page 22 and 23: Introduction Thank you for purchasi
Page 24 and 25: Tips, hints, tricks, and asides to
Page 26 and 27: 1 Introduction to Ajax on ASP.NET O
Page 28 and 29: Introduction to Ajax on ASP.NET Mic
Page 30 and 31: Introduction to Ajax on ASP.NET ❑
Page 34 and 35: Who’s Using Ajax? Introduction to
Page 36 and 37: 2 Introduction to DHTML Dynamic HTM
Page 38 and 39: Writing Your First Block of JavaScr
Page 40 and 41: Introduction to DHTML document.writ
Page 42 and 43: Introduction to DHTML Figure 2-3 Ex
Page 44 and 45: Introduction to DHTML The return ke
Page 46 and 47: Introduction to DHTML var isArrowLe
Page 48 and 49: Using the innerHTML Property Introd
Page 50 and 51: To illustrate this behavior, the ne
Page 52: Introduction to DHTML Now that you
Page 55 and 56: Chapter 3 From Static to Dynamic
Page 57 and 58: Chapter 3 Within the section of th
Page 59 and 60: Chapter 3 Just a reminder of what w
Page 61 and 62: Chapter 3 /* */ Datatypes These are
Page 63 and 64: Chapter 3 Composite types are requi
Page 65 and 66: Chapter 3 These sets of operators a
Page 67 and 68: Chapter 3 var y = 0; do { y = y + 1
Page 69 and 70: Chapter 3 Figure 3-1 shows the resu
Page 71 and 72: Chapter 3 This allows you to assign
Page 73 and 74: Chapter 3 Because the constructor i
Page 75 and 76: Chapter 3 This produces the result
Page 77 and 78: Chapter 3 window navigator location
Page 79 and 80: Chapter 3 There are four levels of
Page 81 and 82: 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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The XMLHttpRequest Object while the
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The XMLHttpRequest Object The secon
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Using the responseText Property The
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The XMLHttpRequest Object As you ca
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Next listed in the following code b
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The XMLHttpRequest Object } // Exec
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The XMLHttpRequest Object Property
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The XMLHttpRequest Object - Select
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The XMLHttpRequest Object In additi
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The XMLHttpRequest Object xmlHttpOb
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The XMLHttpRequest Object at System
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5 Data Communication: XML, XSLT, an
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1986 by ISO standard “ISO 8879:19
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Consider the following code sample
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Data Communication: XML, XSLT, and
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X Path Data Communication: XML, XSL
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6 What Is Built into ASP.NET ASP.NE
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What Is Built into ASP.NET
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What Is Built into ASP.NET
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What Is Built into ASP.NET ❑ ❑
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method. This method allows a develo
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What Is Built into ASP.NET Client/B
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What Is Built into ASP.NET Client/B
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What Is Built into ASP.NET // Get o
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What Is Built into ASP.NET using Sy
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What Is Built into ASP.NET Value S
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DataSet object with some data and s
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Dealing with the Returned Data on t
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What Is Built into ASP.NET // Add t
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What Is Built into ASP.NET } names.
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What Is Built into ASP.NET ❑ Para
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explicit server-side coding is requ
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Chapter 7 Acquiring Ajax.NET Pro Ve
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Chapter 7 The server-side code that
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Chapter 7 So, your entire server-si
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Chapter 7 What Is a Language Proxy?
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Chapter 7 Using strings will get yo
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Chapter 7 the name and street prope
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Chapter 7 Chapter7_ImageSwitcherCal
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Chapter 7 Checking for Null Values
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Chapter 7 The fourth script source
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8 Anatomy of Ajax.NET Pro Library T
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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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