Beginning Ajax With ASP.NET (2006).pdf

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Ajax.NET Professional Library Chapter7_Onloading.aspx.cs Example protected void Page_Load(object sender, EventArgs e) { Utility.RegisterTypeForAjax(typeof(Chapter7_OnLoading)); } [AjaxPro.AjaxMethod()] public string WaitXSeconds(int SecondsToWait) { System.Threading.Thread.Sleep(SecondsToWait*1000); return string.Format(“{0} seconds have passed”,SecondsToWait.ToString());; } The onLoading event in this example will get assigned to a function that you create. The onLoading function takes a single parameter, which is true or false, and lets you know if the onLoading function is being called at the beginning of the request (true) or at the end of the request (false). You use this parameter to set the visible property of an absolute positioned div tag named “loading”. When it’s true, you set the visibility to visible, and when it’s false (the end), you set its value to hidden. Chapter7_Onloading.aspx Example Loading... Click Here to run a 4 second process, and let the user know with a “Loading...” tag in the top left corner of the window. Chapter7_OnLoading.onLoading = function(currentVis) { var loadingDiv = document.getElementById(“loading”); if(loadingDiv != null) { loadingDiv.style.visibility = currentVis ? “visible” : “hidden”; } } function ShowLoading(seconds) { Chapter7_OnLoading.WaitXSeconds(seconds,WaitXSeconds_Callback); } function WaitXSeconds_Callback(response) { alert(response.value); } A nice feature of the way the onLoading event works is that it’s tied to the class object. So, if your registered class (in this case the Page class) has many AjaxMethods on it, the onLoading event will be fired at the beginning and the end of every method that is called. And remember, you had to program this only once! Errors, Errors, Errors. They Happen, You Trap ’em. So far you’ve covered the response’s value, request, and context properties. Last, and maybe most important, is the error property. When Ajax.NET Pro processes your request, if all goes as planned and no error occurs, this property will have a null value. If any unhandled error is thrown during the Ajax.NET 173
Chapter 7 Checking for Null Values If the error property is null, there is no error, at least not one that was sent back with the response object. If the value property is null, the server didn’t return any values, and if the context is null, no context was originally set up. But no matter what they mean, usually you account for these nulls with a simple if() statement in your code, as demonstrated in code earlier in the chapter using this line: if(response.error != null) This line lets you know if an error was returned. In the sample, you coded that if there is an error, the error is shown to the user, and the value of the image source tag is not set. But you can choose to handle the error however you want. Pro request, the string value of that error is returned. The response.error object has three properties — name, description, and number. Property response.error.name response.error.description response.error.number Description The name of the error, usually the namespace of the error that was thrown. This is the equivalent of the Exception.Message in the .NET Framework. If the exception thrown has an error number, it is populated here. Notice that the last code block in the preceding section contains code to check the response.error property to see if it is null. If it is found not to be null, then you know you have an error, and you display the error message to the user. This will probably not be what you want to do in your real-world application. You would probably check the error number, and then handle the error appropriately, according to what caused the error. Using the Ajax.NET Pro Library — Looking under the Hood So, in summary, preparing your application to use the Ajax.NET Pro library requires the following steps: 1. First, you have to set up your ASP.NET application to be Ajax.NET Pro–enabled. This is done with the reference being set to the AjaxPro.dll assembly. 2. Second, you must modify your Web.Config file to register the AjaxPro.AjaxHandlerFactory to process all the AjaxPro/*.ashx requests. 174
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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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Page 160 and 161: method. This method allows a develo
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Page 182: explicit server-side coding is requ
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Other Ajax Frameworks for .NET Figu
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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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