Beginning Ajax With ASP.NET (2006).pdf

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13 Debugging Debugging is the art of identifying and removing problematic code within your applications. Every developer has been required to perform some degree of debugging within their applications at some point in time. ASP.NET is predominately a server-side development technology, and support for debugging of applications within ASP.NET is quite extensive. Ajax applications introduce some new aspects that make the debugging of applications more involved. The extensive use of JavaScript and the fact that custom data may be transferred through the use of asynchronous postbacks mean that new challenges are introduced when debugging Ajax-type applications with ASP.NET. This chapter is going to examine the various aspects of debugging Ajax applications within ASP.NET and will cover the following topics: ❑ ❑ ❑ Server-side ASP.NET debugging Various methods of JavaScript debugging (in conjunction with Document Object Model (DOM) level debugging) Debugging and examination of data sent via asynchronous postbacks As you will see, this chapter covers the full range of areas involving Ajax application development — from the client side, with examination of DOM, HTML, and JavaScript, to the server side, with ASP.NET and the associated server-side language. In addition, we will examine the in between, the data that is sent across the network through the use of asynchronous postbacks from the client to the server, and back again. Server-Side Debugging ASP.NET is a server-based development environment, and the ASP.NET runtime engine parses and compiles virtually all web pages and code into .NET assemblies.
Chapter 13 When an ASP.NET web page is requested (for example, www.SomeSite.com/SomePage.aspx), the ASP.NET runtime engine parses the web page and also the code that is associated with the page. This code is usually in the form of a code file present in the App_Code directory of a web site, or the code can be embedded within the web page (ASPX) itself. The web page and code are compiled into a .NET assembly and loaded into the assembly cache for execution. A .NET assembly is a very rich unit of deployment, in that it can contain an extensive amount of information that allows it to be self-describing. This means that the ASP.NET runtime can interrogate the assembly and obtain a large amount of information about the assembly, such as security requirements and other operating parameters. In addition, special debugging information can be included when the assembly is compiled. As a result of this, the debugging experience on the server for ASP.NET applications can be very rich and interactive. First, let’s look at how debugging support and information can be enabled so that a developer can utilize the debugging features available on the server. Enabling Debugging Support Debugging support needs to be enabled specifically before debugging can be used. For ASP.NET web applications, this means including the following setting within the Web.Config web application configuration file: If you try to run a web application using Visual Studio .NET 2005 in debug mode, and the configuration entry has not been set, you will be prompted to enable debugging support (see Figure 13-1). Figure 13-1 For other project types such as class libraries, Debug must be selected as the active configuration within Visual Studio .NET 2005, as shown in Figure 13-2. 330
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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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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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Page 336 and 337: 12 Atlas Integration with ASP.NET S
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Page 390 and 391: XSLT Commands Element preserve-spac
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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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