Скачать или смотреть How to Properly Render Options in MudSelect in MudBlazor

Learn how to correctly render selectable options using MudBlazor's MudSelect component and enable interactive server-side rendering for full functionality.
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This video is based on the question https://stackoverflow.com/q/79504227/ asked by the user 'Vivian River' ( https://stackoverflow.com/u/238260/ ) and on the answer https://stackoverflow.com/a/79505286/ provided by the user 'Vivian River' ( https://stackoverflow.com/u/238260/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Introduction

When working with MudBlazor's MudSelect component, you might encounter a problem where your options render but you can't see or interact with the dropdown selections properly. This issue can often stem from the Blazor render mode configuration rather than the component itself.

Common Mistake: Missing Server-Side Interactive Rendering

If your MudSelect is showing bindings correctly (e.g., initial selected value) but not responding to user interaction or showing dropdown options, your Blazor app might not be set up for interactive server-side rendering.

Understanding the Problem

The dropdown contents render in the UI.

Bound variables show initial values.

The dropdown does not expand or show options on click.

This is usually because the page is rendered without interactive capabilities, which are essential for MudBlazor components that rely heavily on JavaScript interop.

How to Fix the Issue

1. Enable Interactive Server Render Mode

In your .razor page, add:

[[See Video to Reveal this Text or Code Snippet]]

This directive enables the component to run in interactive mode on the server, allowing JavaScript and signalR communication necessary for MudBlazor components.

2. Import RenderMode Enum

To make InteractiveServer available without fully qualifying it, add to _Imports.razor:

[[See Video to Reveal this Text or Code Snippet]]

This import lets you use @ rendermode InteractiveServer cleanly.

3. Add Blazor Server Script

Include the Blazor server script in your MainLayout.razor (or equivalent layout file):

[[See Video to Reveal this Text or Code Snippet]]

This script enables client-server communication for Blazor Server apps.

Additional Tips

Ensure your component loop uses the correct variables and bindings.

Use [MudSelectItem Value="..."] correctly inside the loop.

Check for typos like referencing undefined variables inside the component template.

Summary

To properly render and interact with options inside a MudBlazor MudSelect:

Confirm your Blazor page uses interactive server rendering via @ rendermode InteractiveServer.

Import the necessary namespaces in _Imports.razor.

Add the Blazor server JavaScript in your layout.

These steps enable the MudBlazor components to work interactively as intended.



By following these setup instructions, the MudSelect dropdown should show your options and respond correctly to user selections.