[dev-v5] Add theme switcher code snippets and supporting styles #4408
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Summary - Unit Tests Code CoverageSummary
CoverageMicrosoft.FluentUI.AspNetCore.Components - 98.7%
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Dec 12, 2025
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[dev-v5] Add theme switcher code snippets and supporting styles
In this example, two buttons are created that allows users to switch between light and dark themes.
The first/left example uses two icons:
The internal CSS class
hidden-if-lightis used to hide the icon when the light theme is active.The internal CSS class
hidden-if-darkis used to hide the icon when the dark theme is active.The second/right example uses the same DarkTheme icon but changes its appearance based on the current theme:
Style="transform: rotate(180deg);"In these two examples, when the button is hovered, the icon color changes to indicate interactivity, using the class
fluent-header-hover.When the user clicks the button, the
OnClickevent handler calls the JavaScript functionBlazor.theme.switchThemeto toggle between light and dark themes.(note the use of
@inject IJSRuntime JSRuntimeto invoke JavaScript functions from Blazor).The
body data-themeattribute is automatically updated, and thethemeChangedevent is triggered.