7: Control Development in a Partial Postback Environment in .NET

Making GS1 - 13 in .NET 7: Control Development in a Partial Postback Environment
7: Control Development in a Partial Postback Environment
Making EAN / UCC - 13 In Visual Studio .NET
Using Barcode creation for ASP.NET Control to generate, create EAN13 image in ASP.NET applications.
a partial postback response, and those objects don t have access to the scripts that were registered using the ClientScriptManager (The primary reason for this is because of the way ClientScriptManager was written and not anything that was programmed wrong in ASPNET AJAX) Because of ClientScriptManager s shortcomings, ASPNET AJAX comes with a new way of registering client scripts that successfully registers scripts in all rendering environments (normal postback and partial postback): through ScriptManager s static RegisterXXX methods Fortunately, it s pretty easy to learn the new RegisterXXX methods, detailed in Table 71, because they are direct replacements for the ClientScriptManager methods that we previously used to register scripts
Create Bar Code In VS .NET
Using Barcode drawer for ASP.NET Control to generate, create bar code image in ASP.NET applications.
Table 71 ScriptManager Script Registration Methods Method RegisterArrayDeclaration Description
GTIN - 13 Creation In .NET
Using Barcode drawer for .NET Control to generate, create EAN 13 image in Visual Studio .NET applications.
Provides the ability to register a JavaScript array that will be properly registered when using an UpdatePanel and comes in handy when the client needs information that is obtainable only during runtime Provides the ability to register a script block that is properly registered when using an UpdatePanel and provides the ability to have the script tags added automatically or be included in the script block for cases where you want to control the script tag attributes that is properly registered when using an UpdatePanel The script le is registered using the src attribute on the script tag and must be in the web folder structure of your application, because this method of registration does not work with embedded resources
EAN 13 Creator In Visual Studio .NET
Using Barcode creator for ASP.NET Control to generate, create European Article Number 13 image in ASP.NET applications.
RegisterClientScriptBlock
Code128 Generation In .NET Framework
Using Barcode printer for ASP.NET Control to generate, create Code 128A image in ASP.NET applications.
RegisterClientScriptInclude Provides the ability to register a script le
GS1-128 Maker In .NET Framework
Using Barcode creation for ASP.NET Control to generate, create GS1-128 image in ASP.NET applications.
RegisterClientScriptResource Provides the ability to register a script le
Code 3 Of 9 Creator In VS .NET
Using Barcode generator for ASP.NET Control to generate, create Code 39 Full ASCII image in ASP.NET applications.
that is embedded in an assembly and needs to be properly registered when using an UpdatePanel In cases of an Extender Control or ScriptControl registering with the ScriptReference class
Making UPC-A Supplement 2 In .NET
Using Barcode encoder for ASP.NET Control to generate, create UPC-A Supplement 5 image in ASP.NET applications.
Loading of JavaScript Statements and File s
Encoding Bar Code In VS .NET
Using Barcode creation for ASP.NET Control to generate, create barcode image in ASP.NET applications.
Method RegisterOnSubmitStatement Description
Draw Identcode In Visual Studio .NET
Using Barcode encoder for ASP.NET Control to generate, create Identcode image in ASP.NET applications.
Provides the ability to register script fragments that will be included in the WebForm_OnSubmit method on a page When you use this registration method, all script fragments that are registered will run when the page is partially updating or doing a full postback Provides the ability to register script fragments that will be run when the page is initially created or after a partial rendering has occurred
Decoding Code 3/9 In .NET Framework
Using Barcode reader for .NET framework Control to read, scan read, scan image in VS .NET applications.
RegisterStartupScript
Code 128 Encoder In Java
Using Barcode maker for Java Control to generate, create Code 128C image in Java applications.
In some cases, however, these new methods have a slightly different signature and behavior than the ClientScriptManager methods they replaced To demonstrate these differences, let s take a look at the three different ways we can register a client script block Listing 725 shows the three method calls
Code 128 Code Set C Decoder In VS .NET
Using Barcode recognizer for Visual Studio .NET Control to read, scan read, scan image in VS .NET applications.
Listing 725 ClientScriptManager versus ScriptManager Script Registration
Drawing GTIN - 128 In Java
Using Barcode drawer for Java Control to generate, create GTIN - 128 image in Java applications.
thisClientScriptRegisterClientScriptBlock (thisGetType(), "MyOriginalAlert", "alert('We are loaded with ClientScriptClientScriptBlock');", true); ScriptManagerRegisterClientScriptBlock( this, thisGetType(), "MyOriginalScriptManagerAlert", "alert('We are loaded with ScriptManagerRegisterClientScriptBlock');", true); ScriptManagerRegisterClientScriptBlock( thisTextBox2, typeof(TextBox), "TextBox2Script", "alert('TextBox2 based script is here')", true);
Creating Barcode In Java
Using Barcode generator for Java Control to generate, create barcode image in Java applications.
7: Control Development in a Partial Postback Environment
Code 128 Maker In VS .NET
Using Barcode maker for .NET framework Control to generate, create Code 128B image in .NET framework applications.
The rst method registers the script with the page using ASPNET s ClientScriptManager When the page is rst created or when the page is posted back, the script will run; however, the script will not run in a partial postback The second method uses the new ScriptManager method of registering a script block This script will run when the page is rst loaded, during a normal postback, and during a partial postback The nal method shows the power of the new methods and how they are speci cally tuned to the UpdatePanel In this case, we can associate the script to a control and run that script only when the control is part of the response What this means is that when the page is rst created and when the page is in a normal postback, the script will run The script will also run when TextBox2 is included in a partial postback response This ability becomes handy when you have multiple UpdatePanel controls on a page and want to run a script only when the control is contained in an UpdatePanel that is being partially rendered
Barcode Encoder In VB.NET
Using Barcode encoder for Visual Studio .NET Control to generate, create barcode image in .NET applications.
Always Use the ScriptManager for Client Script Registration
European Article Number 13 Creator In .NET
Using Barcode maker for .NET framework Control to generate, create EAN / UCC - 13 image in Visual Studio .NET applications.
Now that we re in a partial postback world, you should always use ScriptManager to register your scripts Getting in this habit will allow your scripts to work seamlessly in both a normal rendering and in a partial rendering environment The only catch to this rule is if you re a third-party control developer In that case, you might want to con rm that ASPNET AJAX is installed in the environment your code is executing in before using ScriptManager to register the scripts
Barcode Drawer In Visual C#
Using Barcode printer for Visual Studio .NET Control to generate, create bar code image in Visual Studio .NET applications.
To get a better feel for how scripts are affected by a partial postback, let s walk through a quick example in which we register a couple of scripts using ClientScriptManager and ScriptManager We start with the UpdatePanel sample page we used earlier in the chapter (redisplayed in Listing 726) and update its code behind to register the scripts in its Page_Load method Listing 727 shows the updated code behind, and Figure 721 shows the page s visual output
Barcode Reader In Java
Using Barcode reader for Java Control to read, scan read, scan image in Java applications.