Can you explain scriptmanager control in ajax

You can also set the AllowCustomErrorsRedirect property to specify how the custom errors section of the Web. In this example, the default value of the AllowCustomErrorsRedirect property is used. This means that if the Web. NET Settings Schema. The following example shows how to set the EnableScriptGlobalization property so that client script can display a culture-specific date and time in the browser.

In the example, the Culture attribute of the Page directive is set to auto. As a result, the first language that is specified in the current browser settings determines the culture and UI culture for the page. Script Management and Registration.

The control manages all ASP. NET Ajax resources on a page. This includes downloading Microsoft Ajax Library scripts to the browser and coordinating partial-page updates that are enabled by using UpdatePanel controls. In addition, the ScriptManager control enables you to do the following:.

Register script that is compatible with partial-page updates. In order to manage dependencies between your script and the core library, any script that you register is loaded after the Microsoft Ajax Library script. Provide access to Web service methods from script by registering Web services with the ScriptManager control. Provide access to ASP. NET authentication, role, and profile application services from client script by registering these services with the ScriptManager control.

Access localization resources for embedded script files or for stand-alone script files by using the ResourceUICultures property of the ScriptReference control. Register server controls that implement the IExtenderControl or IScriptControl interfaces with the ScriptManager control so that script required by client components and behaviors is rendered. The ability of an ASP. NET page to support partial-page rendering is controlled by the following factors:.

There must be at least one UpdatePanel control on the page. The SupportsPartialRendering property must be true the default value. If the SupportsPartialRendering property is not set explicitly, its value is based on browser capabilities. You can override the value of the EnablePartialRendering property at run time during or before the page's Init event. If you try to change this property after the page's Init event has occurred, an InvalidOperationException exception is thrown.

When partial-page rendering is supported, the ScriptManager control renders script to enable asynchronous postbacks and partial-page updates. The regions of the page to be updated are designated by using UpdatePanel controls. The ScriptManager control handles the asynchronous postbacks and refreshes only the regions of the page that have to be updated.

For more information about partial-page rendering, see Partial-Page Rendering Overview. For more information about the conditions that cause an update, see UpdatePanel Control Overview. A page can contain only one ScriptManager control in its hierarchy.

To register services and scripts for nested pages, user controls, or components when the parent page already has a ScriptManager control, use the ScriptManagerProxy control. The ScriptManager control enables you to register script that is then rendered as part of the page.

The ScriptManager control registration methods can be broken into the following three categories:. Registration methods that guarantee that script dependencies on the Microsoft Ajax Library are maintained. Registration methods that are not dependent on the Microsoft Ajax Library, but that are compatible with UpdatePanel controls.

Registration methods that support working with UpdatePanel controls. For more information about how to create and use Ajax script in ASP. You can use the following methods to register script files in a way that guarantees that any dependencies on the Microsoft Ajax Library are maintained. You can use the following methods to register script files that are not dependent on the Microsoft Ajax Library but that are compatible with UpdatePanel controls.

These methods correspond to similar methods of the ClientScriptManager control. If you are rendering script for use inside an UpdatePanel control, make sure that you call the methods of the ScriptManager control. When you register an expando attribute of a previously registered attribute, an exception is thrown.

Duplicate registration of array values is allowed. Instead, register script that contains function definitions like event handlers or custom class definitions for your application. You can use the following methods to customize partial-page updates when you use UpdatePanel controls.

You can register a Web service to be called from client script by creating a ServiceReference object and adding it to the Services collection of the ScriptManager control. You can programmatically add ServiceReference objects to the Services collection to register Web services at run time. The ScriptManager control generates references in the rendered page that point to the appropriate localized script files, which are either script files embedded in assemblies or stand-alone script files.

When the EnableScriptLocalization property is set to true , the ScriptManager control retrieves localized resources such as localized strings for the current culture, if they exist. The ScriptManager control provides the following functionality for using localized resources:. Script files that are embedded in an assembly.

The ScriptManager control determines which culture-specific or fallback-culture script file to send to the browser. It does this by using the culture-specific NeutralResourcesLanguageAttribute assembly attribute, the resources packaged with the assembly, and the UI culture of the browser if any. Stand-alone script files. In debug mode. The ScriptManager control tries to render a culture-specific script file that contains debug information. For example, if the page is in debug mode and the current culture is set to en-MX, the control renders a script file that has a name such as scriptname.

If the file does not exist, the debug file for the appropriate fallback culture is rendered. For more information about how to localize resources, see Localizing Resources for Component Libraries Overview. When a page error occurs during asynchronous postbacks, the AsyncPostBackError event is raised. The way in which errors on the server are sent to the client depends on the AllowCustomErrorsRedirect property, the AsyncPostBackErrorMessage property, and the custom errors section of the Web.

Initializes a new instance of the ScriptManager class. Gets or sets a value that specifies how client scripts of the Microsoft Ajax client library will be included on the client. Gets or sets a value that determines whether the custom errors section of the Web. Gets or sets the application-relative virtual directory of the Page or UserControl object that contains this control. Gets or sets the error message that is sent to the client when an unhandled server exception occurs during an asynchronous postback.

Gets or sets a value that indicates the time, in seconds, before asynchronous postbacks time out if no response is received. Gets the AuthenticationServiceManager object that is associated with the current ScriptManager instance. Gets or sets the algorithm that is used to generate the value of the ClientID property.

Gets a character value representing the separator character used in the ClientID property. Gets or sets the name of the method that handles the Sys. Gets the HttpContext object associated with the server control for the current Web request. Gets a ControlCollection object that represents the child controls for a specified server control in the UI hierarchy.

Gets a reference to the naming container if the naming container implements IDataItemContainer. Gets a reference to the naming container if the naming container implements IDataKeysControl. Gets or sets a value that indicates whether public static page methods in an ASP. NET page can be called from client script. One key difference exists in how the ScriptManager treats scripts retrieved from the filesystem compared with those embedded as a resource in a dll.

When the path to a script is used, the ScriptManager provides a callback to the ScriptResource handler, which retrieves the contents. The script itself is not modified no extra calls are injected. When a script is retrieved as an embedded resource, however, the ScriptManager injects the call to Sys. This allows you to start using scripts that you already have with ASP.

In Visual Studio, you first create a class library project. You can do this from your existing web application by right-clicking the Solution name in the Solution Explorer window. Alternatively, you can choose to create a new Project from the File menu. In the dialog where you select the Class Library type you can also choose to add this project to the current Visual Studio Solution. You create the script files as you normally would, by adding JScript files to the project.

Remember that using the naming convention of adding. To embed the scripts into the resulting dll, you set the Build Action in the Properties pane for the script file to Embedded Resource, as shown in Figure In this example, I have added embeddedSample.

Listing embeddedSample. For some functions, you want to do parameter validation in release scripts, but for many situations, you just want the extra checks during development and testing. To be able to add a ScriptReference for the embeddedSample script, you need to define the WebResource for the project. The WebResource attribute is in the System. UI namespace. The attribute is used in the code of your project to include the script into the compiled dll. The project needs a compile-time reference to the System.

Web assembly to compile. Figure shows the dialog where you can select System. The WebResource is added to the AssemblyInfo. NET the names and types of resources available from assemblies in your web project. In this case, there are two resources, and both of them are JavaScript files to be embedded in the assembly. If you create the class library as a project within your web project in Visual Studio, you can modify the properties of the project to have the resource assembly copied into the bin directory of your web application.

If it is a separate project, you will need to explicitly set the output location or copy the dll into your application manually. To declare the dependency on the separate project, right-click on the Web Project in the Solution Explorer and select the Add Reference option. From there, you can select the project with the embedded resources. This is the same place where you can choose to copy the output to a specific location when the dll is compiled.

Now you have a dll with script resources embedded, and can include them in your page with a ScriptReference. Listing EmbeddedReference. When debugging is not enabled for the page, the browser displays the number 6 and NaN.

When using the debug version of the script, however, you get the benefit of running the debug version of the script, and a better error message is displayed, explaining that the argument cannot be undefined. You saw when using the path attribute of a ScriptReference to load a script from a file that the ScriptManager does not switch automatically between debug and release versions of the script. And when using the name and assembly attributes to specify loading of an embedded script, it will pick up the right version based on the server setting.

If you do not provide a debug version of the script, the ScriptManager will notice this and fall back to the release version. It is not an error to skip inclusion of debug script resources. You can include all three attributes - name, assembly, and path - in a single ScriptReference ele-ment and get a slightly different behavior still. The path will be used to retrieve the script from disk, but the determination of whether or not a debug version of the script is available is made by looking at the embedded resources.

If you have a debug embedded resource and choose to get the script from disk, it is an error to try and retrieve the debug version if it does not exist on disk. The ScriptManager will not fall-back from the filesystem to the embedded resource.

NET Framework has good support for providing and using localized resources in. NET applications. This is a feature that has been lacking in JavaScript.

NET AJAX makes it possible to provide localized string resources and have the correct language used automatically at runtime. It follows the same principle as the previous example of embedded script resources, but extends it to automatically generate a string resource class.

Instead, the ScriptResource attribute is used along with the WebResource attribute to instruct the ScriptManager to create the class. The WebResource attribute is still required to specify the resource name and its type.

Then the ScriptResource attribute is added with the name of the script resource, along with the name of the string resources to use and the name of the class to create in JavaScript for use in the browser. This is done in the AssemblyInfo. The name of the. You can define shortText and longText keys in the LocalizedMessage. In this case, fr means the French language, and FR means the French culture. In some cases, a given language can have several culture variations, for example, American English versus British English.

Figure shows the French resource file. As you can see, it really is just a set of name-value pairs being established for cultures that will be accessed in the application. To use localized resources, you do not have to provide versions for every possible culture known to the. NET Framework. A request for a culture that does not have localized versions of the strings will fall back to the default strings instead. Next Recommended Reading.

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