Partial-page rendering, which enables regions on the page to be independently refreshed without a postback. The ASP. JavaScript proxy classes for Web services, which enable you to use client script to access Web services by exposing Web services as strongly typed objects. JavaScript classes to access ASP. NET authentication and profile application services. Besides above answers, I would like to add some points for the reason behind using ScriptManager control.
The ScriptManager control serves as the bridge between the client page and the server. As it is like a bridge, you've to use this control if any of the other AJAX controls needs to be added. It manages script resources the JavaScript files used at the client , takes care of partial-page updates as shown earlier, and handles interaction with your web site for things like web services and the ASP. NET application services such as membership, roles, and profile.
Whenever one of the controls within the UpdatePanel causes a postback to the server, only the content within that UpdatePanel is refreshed.
If you analyze the data that gets sent from the server to the browser using a network analysis tool like Fiddler or Wireshark , you would see that only a limited amount of data gets sent to the client.
You usually place the ScriptManager control directly in a content page if you think you need Ajax capabilities on only a handful of pages. You can only have one ScriptManager per page i. In order to access a ScriptManager control that is defined in a master page from a content page, you can use the ScriptManagerProxy. NET Web pages. Stack Overflow for Teams — Collaborate and share knowledge with a private group.
Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Raises events for the ScriptManager control when it posts back to the server. Registers a client script block with the ScriptManager control for use with a control that is inside an UpdatePanel control, and then adds the script block to the page.
Registers a client script file with the ScriptManager control for use with a control that is inside an UpdatePanel control, and then adds a script file reference to the page. Registers client script with the ScriptManager control every time that an asynchronous postback occurs, and then adds a script file reference to the page.
Registers the client script that is embedded in an assembly with the ScriptManager control for use with a control that is participating in partial-page rendering. Registers a client script file that is embedded in an assembly with the ScriptManager control every time that a postback occurs. Registers a dispose script for a control that is inside an UpdatePanel control.
The script is executed when the UpdatePanel control is updated or deleted. Registers an extender control with the current ScriptManager instance. Registers a hidden field with the ScriptManager control for a control that is inside an UpdatePanel control. Registers a hidden field with the ScriptManager control during every asynchronous postback. Registers client script by resource name that is embedded in an assembly with the ScriptManager control for use with a control that is participating in partial-page rendering.
Registers a control as a trigger for a postback. This method is used to configure postback controls inside an UpdatePanel control that would otherwise perform asynchronous postbacks.
Registers a script control with the current ScriptManager instance. Calls back to an ExtenderControl class to return instance scripts that must be rendered to support the client object that represents a client control, component, or behavior. Calls a ScriptControl class to return instance scripts that must be rendered to support the client object that represents a client control, component, or behavior.
Registers a startup script block for a control that is inside an UpdatePanel by using the ScriptManager control, and adds the script block to the page. Registers a startup script block for every asynchronous postback with the ScriptManager control and adds the script block to the page. Called after a child control is removed from the Controls collection of the Control object. Renders the ScriptManager control's content to the browser by using the specified HtmlTextWriter object.
Outputs the content of a server control's children to a provided HtmlTextWriter object, which writes the content to be rendered on the client. Outputs server control content to a provided HtmlTextWriter object and stores tracing information about the control if tracing is enabled. Outputs server control content to a provided HtmlTextWriter object using a provided ControlAdapter object. Saves any server control state changes that have occurred since the time the page was posted back to the server.
Saves any server control view-state changes that have occurred since the time the page was posted back to the server. Assigns an event handler delegate to render the server control and its content into its parent control. Sets trace data for design-time tracing of rendering data, using the trace data key and the trace data value. Sets trace data for design-time tracing of rendering data, using the traced object, the trace data key, and the trace data value.
Causes tracking of view-state changes to the server control so they can be stored in the server control's StateBag object. This object is accessible through the ViewState property. Occurs when a server control is released from memory, which is the last stage of the server control lifecycle when an ASP.
NET page is requested. Occurs when the server control is loaded into the Page object. Occurs when the user clicks the browser's Back or Forward button. Occurs after the Control object is loaded but prior to rendering. Occurs when a composite script is registered with the ScriptManager control.
Occurs when a member of the Scripts collection is registered with the ScriptManager control. For a description of this member, see ControlBuilder. For a description of this member, see GetDesignModeState. For a description of this member, see SetOwnerControl Control. For a description of this member, see UserData.
For a description of this member, see DataBindings. For a description of this member, see HasDataBindings. For a description of this member, see Expressions. For a description of this member, see HasExpressions. Enables the ScriptManager control to process a postback event and load the history state of the Web page.
Feedback will be sent to Microsoft: By pressing the submit button, your feedback will be used to improve Microsoft products and services. Privacy policy. Skip to main content. This browser is no longer supported. Download Microsoft Edge More info. Contents Exit focus mode. UI Assembly: System. Is this page helpful? Yes No. Any additional feedback? Skip Submit. Registers a server control that implements the IScriptControl interface that is used to define a Sys.
Component client object. The ScriptManager control renders script that supports the client object. Registers a server control that implements the IExtenderControl interface that is used to define a Sys. The script is specified as a string parameter. The script content is specified by setting the src attribute to a URL that points to a script file. The script content is specified with a resource name in an assembly. The src attribute is automatically populated with a URL by a call to an HTTP handler that retrieves the named script from the assembly.
Registers a script that is executed in response to the form element's submit event. The onSubmit attribute references the specified script. The script to render is specified as a string parameter. The dispose method is used for client components that are part of the Microsoft Ajax Library and that have to free resources when a component is no longer used. Registers a control as a trigger for a full postback. This method is used for controls inside an UpdatePanel control that would otherwise perform asynchronous postbacks.
Gets the browser-specific adapter for the control. Inherited from Control. Gets the unique ID of the control that caused the asynchronous postback. Gets the control that contains this control's data binding.
Gets a value that indicates whether the server control's child controls have been created. Gets a value indicating whether a control is being used on a design surface. Gets or sets a value that indicates whether the Web page supports history point management. Gets or sets a value that indicates whether to encrypt the history state string.
Gets or sets a value indicating whether themes apply to this control. Gets a list of event handler delegates for the control. This property is read-only. Gets or sets the programmatic identifier assigned to the server control. Gets the character used to separate control identifiers. Gets a value indicating whether controls contained within this control have control state.
Gets a value that indicates whether the server control is saving changes to its view state. Gets a value indicating whether view state is enabled for this control. Gets a reference to the server control's parent control in the page control hierarchy. Gets a value that specifies the ASP. Gets or sets the skin to apply to the control.
Gets a value that indicates whether the client supports partial-page rendering. Gets or sets a reference to the template that contains this control. Gets the unique, hierarchically qualified identifier for the server control. Gets or sets the view-state mode of this control. AddedControl Control, Int AddHistoryPoint String, String. AddParsedSubObject Object. ApplyStyleSheetSkin Page.
Applies the style properties defined in the page style sheet to the control. Begins design-time tracing of rendering data. BuildProfileTree String, Boolean. Deletes the control-state information for the server control's child controls. Deletes the view-state information for all the server control's child controls.
Binds a data source to the invoked server control and all its child controls. DataBind Boolean. The code can be used with other server technologies, as it is focused on enriched client-side development. There are debug and release versions of the script files, discussed later in this chapter. The resources are also embedded in the System. The third script reference is for the MicrosoftWebForms Library. This code is retrieved as a resource from the dll by default, but is also copied onto disk.
These scripts provide support for the UpdatePanel and the lifecycle of events associated with using partial page rendering. The other two script entries are rendered inline in the page. You can see this in the following code, which is again part of the page output from requesting Bare.
The first is for the PageRequestManager that handles partial page updates. The second piece of script performs the primary startup of the client page lifecycle by initializing the application object. You have seen that including the ScriptManager in the page results in rendering the scripts necessary to use the client-side Microsoft AJAX Library and to take advantage of partial page rendering as well.
It also renders the scripts necessary for initiating the lifecycle of JavaScript events. The ScriptManager element can contain a scripts collection for adding scripts to the page. Instead of writing the script element directly, the script can be added to the set of scripts that the ScriptManager controls using a ScriptReference element. By including it this way, I am assured that it will be loaded at a point when the ASP. This is shown in Listing ScriptReference. You would expect that requesting this page would result in the same output as running Bare.
After the initial request for the page, everything appears to be the same, but during partial page updates when asynchronous updates are happening and scripts are being loaded, a JavaScript error is encountered, as shown in Figure A call to Sys.
Not all browsers provide an event in their DOM for detecting this automatically. The script would actually run fine without it, but to ensure cross-browser support, the ScriptManager requires the call. Listing Sample. Rather than directly making the call, I first need to check that the Sys namespace is defined. The script can then be included in a page where the ASP.
The default value of this enum is Auto. The other possible values are Release , Debug , and Inherit. The ScriptMode determines whether release or debug versions of the scripts are used. When set to Auto , the determination is primarily the result of server settings. Debug scripts are used when debug is set to true in the compilation section of the web. The deployment setting in the configuration file trumps all of the other settings. When retail is set to true, all other debug settings are treated as false and you won't get debug versions of the scripts.
The Auto setting for ScriptMode is almost identical to the Inherits value, except for this behavior. Inherits will take the value directly from the server configuration. The pattern you use to provide debug versions of scripts is to add. The name the ScriptManager would assume for the debug version of Sample.
Again, this error is only produced when script loading is validated during asynchronous postbacks, not during the initial loading of the page. The choice of using. You can set the debug mode you want and get the right version for the scripts you want to debug.
For file-based script resources, you toggle between the release and debug versions by setting the ScriptMode attribute to Debug directly on the ScriptReference. There are some advantages to embedding JavaScript files as resources in a dll and deploying them that way.
You can maintain a set of release and debug scripts in a single location and use the ScriptManager to dynamically switch between versions. And once deployed, you have version information on the scripts, allowing for easier maintenance and servicing.
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.
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