[dev-v5] Add a generic FluentOption<TOption> #4456
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Summary - Unit Tests Code CoverageSummary
CoverageMicrosoft.FluentUI.AspNetCore.Components - 98.8%
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Collaborator
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@dvoituron the current code works with non nullable properties. However selection via code does not work properly yet. Add <FluentButton OnClick="() => SelectedLanguageId = 1">Select C#</FluentButton>to the sample and then hit it. The value changes but not the displayed one on the dropdown. Using null as option breaks the component. See this code for reference: <FluentSelect Label="Language" @bind-Value="@SelectedLanguageId">
<FluentOption TOption="int?" Value="null"></FluentOption>
@foreach (var language in Languages)
{
<FluentOption Value="@language.Id">
@language.Name
</FluentOption>
}
</FluentSelect>
<div>
Selected: @(SelectedLanguageId?.ToString() ?? "<NULL>")
</div>
@code {
int? SelectedLanguageId;
static Language[] Languages = new Language[]
{
new(1, "C#"),
new(2, "Java"),
new(3, "Python"),
new(4, "JavaScript"),
new(5, "Go")
};
record Language(int Id, string Name);
} |
Collaborator
Author
The |
Collaborator
When I want to provide a manual item then I have to. <FluentOption TOption="int?" Value="null"></FluentOption>This item should mimic the default state and allows the user to unselect a previous selected option. |
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MarvinKlein1508
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MarvinKlein1508
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I did some testing and it works pretty well so far. I would update the language sample to having a null value as well.
For example:
<!-- Using Items -->
<FluentSelect Label="Language"
Items="@Languages"
@bind-Value="@SelectedId1"
OptionText="@(i => i.Name)"
OptionBindedValue="@(i => i.Id)" />
<!-- Using FluentOptions -->
<FluentSelect Label="Language"
TOption="Language"
TValue="int?"
@bind-Value="@SelectedId2">
<FluentOption TValue="int?" Value="null">--- Select ---</FluentOption>
@foreach (var language in Languages)
{
<FluentOption TValue="int?" Value="@language.Id">
@language.Name
</FluentOption>
}
</FluentSelect>
<div>
IDs: (@SelectedId1, @SelectedId2)
</div>
@code {
int SelectedId1 = 3;
int? SelectedId2 = 3;
static Language[] Languages = new Language[]
{
new(1, "C#"),
new(2, "Java"),
new(3, "Python"),
new(4, "JavaScript"),
new(5, "Go")
};
record Language(int Id, string Name);
}In vanilla Blazor this part is representing <option value=""></option> for setting back to null for any nullable type.
Also I have noticed that setting the selected items via code is not working as expected.
Try adding this 3 buttons to the language demo
<FluentButton OnClick="() => SelectedId1 = 1">Set first to C#</FluentButton>
<FluentButton OnClick="() => SelectedId2 = 1">Set second to C#</FluentButton>
<FluentButton OnClick="() => SelectedId2 = null">Set second to null</FluentButton>Initial state:
When I press on Set first to C#:
Collaborator
|
btw. these changes also fix #4295 for me |
…-v5/fluent-option-typed
…and OptionValue to OptionValueToString (formats value for HTML)
Collaborator
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@dvoituron there is still an issue when setting the second language example via code. <FluentButton OnClick="() => SelectedId1 = 1">Set first to C#</FluentButton>
<FluentButton OnClick="() => SelectedId2 = 1">Set second to C#</FluentButton>
<FluentButton OnClick="() => SelectedId2 = null">Set second to null</FluentButton>First button works fine. The other two are changing the value but the dropdown will still display the wrong one. |
Collaborator
Author
No. This is a Blazor behavior: you need to add ’@key’ to fix that. I added this info in the markdown page (below the example) |
MarvinKlein1508
approved these changes
Jan 14, 2026
vnbaaij
approved these changes
Jan 14, 2026
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[dev-v5] Add a generic FluentOption
This pull request introduces a generic
FluentOption<TOption>component, enabling type-safe options for FluentSelect, FluentCombobox, and related components, and updates supporting infrastructure and samples accordingly.Example:
Unit Tests
100%: Updated