ScriptManager Component
The ScriptManager component is a migration stub that exists solely for markup compatibility when migrating from ASP.NET Web Forms. It renders no visible output.
Migration Note
In Web Forms, ScriptManager was required on every page that used AJAX features (UpdatePanel, Timer, etc.). It managed JavaScript resources, partial rendering, and web service proxies.
In Blazor, these responsibilities are handled by the framework itself:
- Partial rendering — Blazor's diff-based rendering handles this automatically
- Script management — Use
<script>tags or JS interop - Page methods — Use Blazor component methods or API controllers
- Globalization/Localization — Use .NET localization middleware
You can safely remove <ScriptManager> after migration is complete, or leave it in place — it has no effect on rendering or performance.
Usage (renders nothing)
The component below is present on this page but produces no HTML output:
↑ A ScriptManager is rendered above this line. Inspect the page source to confirm it produces no HTML.
<ScriptManager EnablePartialRendering="true" ScriptMode="ScriptMode.Auto" />Supported Properties (for migration compatibility)
| Property | Type | Default | Notes |
|---|---|---|---|
| EnablePartialRendering | bool | false | No effect in Blazor |
| EnablePageMethods | bool | false | No effect in Blazor |
| ScriptMode | ScriptMode | Auto | No effect in Blazor |
| AsyncPostBackTimeout | int | 90 | No effect in Blazor |
| EnableCdn | bool | false | No effect in Blazor |
| EnableScriptGlobalization | bool | false | No effect in Blazor |
| EnableScriptLocalization | bool | false | No effect in Blazor |
Web Forms Equivalent
<!-- Web Forms — required on every AJAX-enabled page -->
<asp:ScriptManager ID="ScriptManager1" runat="server"
EnablePartialRendering="true"
EnablePageMethods="true"
AsyncPostBackTimeout="90" />