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Introduction to the UpdatePanel Control. Creating a Simple ASP. You can enable partial-page rendering by using the UpdatePanel and ScriptManager Web server controls.

The UpdatePanel control identifies a region of a page that can be updated. The ScriptManager control keeps track of the UpdatePanel controls that are on a page and the controls that trigger the UpdatePanel controls to refresh. Controls inside an UpdatePanel control that cause a postback are automatically identified as triggers for the update panel. You can also specify controls that are controls outside an UpdatePanel control. External triggers can be child controls of another UpdatePanel control.

There is no limit to the number of UpdatePanel controls that you can put on a page. As a result, you can specify regions of a page that are refreshed independently of the whole page and independently of each other. This means that whenever a partial-page refresh is triggered, the UpdatePanel control refreshes the page, even if the trigger was not for that UpdatePanel control.

To make sure that the UpdatePanel control is refreshed only when it has been triggered, you can set the UpdateMode property of the UpdatePanel control to Conditional. The following example includes two UpdatePanel controls. One control includes Web controls that accept user input, and the other control displays what the user enters.

As a result, if a user clicks the Cancel button to clear the fields of the input form, only the input form of the UpdatePanel control is refreshed. If a user clicks the Insert button to submit the form, both UpdatePanel controls are refreshed.

You can also nest an UpdatePanel control inside another UpdatePanel control. If you set the UpdateMode property of both the outer and nested controls to Conditional , the outer panel is not refreshed when only the inner panel is triggered. However, if a trigger refreshes the outer panel, both the outer and inner panels are refreshed.

The following example includes a GridView control inside an UpdatePanel control. An asynchronous postback behaves like a regular postback in that the resulting server page executes the complete page and control life cycle. However, with an asynchronous postback, page updates are limited to regions of the page that are enclosed in UpdatePanel controls and that are marked to be updated. The server sends HTML markup for only the affected elements to the browser. You can add this element added dynamically in server code.

The following illustration shows a page that is loaded for the first time, and a subsequent asynchronous postback that refreshes the content of an UpdatePanel control. By default, partial-page updates are enabled because the default value of the EnablePartialRendering property of the ScriptManager control is true.

The following example shows markup that defines a ScriptManager control and an UpdatePanel control on a page. The UpdatePanel control contains a Button control that refreshes the content inside the panel when you click it. By default, the ChildrenAsTriggers property is true. Therefore, the Button control acts as an asynchronous postback control. You add content to an UpdatePanel control declaratively or in the designer by using the ContentTemplate property. In markup, this property is exposed as a ContentTemplate element.

To add content programmatically, you use the ContentTemplateContainer property. When a page that contains one or more UpdatePanel controls is first rendered, all the contents of the UpdatePanel controls are rendered and sent to the browser. On subsequent asynchronous postbacks, the content of individual UpdatePanel controls might be updated.

Updates depend on the panel settings, on what element caused the postback, and on code that is specific to each panel. By default, any postback control inside an UpdatePanel control causes an asynchronous postback and refreshes the panel's content.

However, you can also configure other controls on the page to refresh an UpdatePanel control. You do this by defining a trigger for the UpdatePanel control. A trigger is a binding that specifies which postback control and event cause a panel to update. When the specified event of the trigger control is raised for example, a button's Click event , the update panel is refreshed.

The following example shows how to specify a trigger for an UpdatePanel control. A trigger's control event is optional. If you do not specify an event, the trigger event is the default event of the control. For example, for the Button control, the default event is the Click event.

The following list describes the property settings of the UpdatePanel control that determine when a panel's content is updated during partial-page rendering. This includes asynchronous postbacks from controls that are inside other UpdatePanel controls, and postbacks from controls that are not inside UpdatePanel controls.

When the postback is caused by a trigger for that UpdatePanel control. When you explicitly call the UpdatePanel control's Update method. When the UpdatePanel control is nested inside another UpdatePanel control and the parent panel is updated. When the ChildrenAsTriggers property is set to true and any child control of the UpdatePanel control causes a postback.

Child controls of nested UpdatePanel controls do not cause an update to the outer UpdatePanel control unless they are explicitly defined as triggers for the parent panel. If the ChildrenAsTriggers property is set to false and the UpdateMode property is set to Always , an exception is thrown. To use an UpdatePanel control in a master page, you must decide how to include the ScriptManager control. If you include the ScriptManager control on the master page, it can act as the ScriptManager control for all content pages.

If you want to register scripts or services declaratively in a content page, you can add a ScriptManagerProxy control to that content page. If the master page does not contain the ScriptManager control, you can put the ScriptManager control individually on each content page that contains an UpdatePanel control.

The design choice depends on how you intend to manage client script in your application. For more information about how to manage client script, see ScriptManager Control Overview.

For more information about master pages, see ASP. In some cases, the ScriptManager control is on the master page and you do not need partial-page rendering capabilities for a content page. In those cases, you must programmatically set the EnablePartialRendering property of the ScriptManager control to false for that content page. Weiter zum Hauptinhalt. Microsoft Edge herunterladen Weitere Informationen.

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