Blazor Dropdown

Dropdowns are toggleable, contextual overlays for displaying lists of links and more. They are toggled by clicking, not by hovering; this is an intentional design decision'by bootstrap.

Name	Type	Default	Required	Description	Added Version
AutoClose	bool	true		If true, enables the auto close.	1.10.0
AutoCloseBehavior	`DropdownAutoCloseBehavior`	`DropdownAutoCloseBehavior.Both`		Gets or sets the auto close behavior of the dropdown.	1.10.0
ChildContent	RenderFragment	null	✔️	Gets or sets the content to be rendered within the component.	1.10.0
Color	`DropdownColor`	`DropdownColor.None`		Gets or sets the dropdown color.	3.0.0
Direction	`DropdownDirection`	`DropdownDirection.Dropdown`		Gets or sets the direction of the dropdown menu.	1.10.0
Disabled	bool	false		If true, dropdown will be disabled.	1.10.3
Size	`DropdownSize`	`DropdownSize.None`		Gets or sets the size of the dropdown.	1.10.3
Split	bool	false		Gets or sets the toggle button split behavior.	1.10.0

DropdownToggleButton Parameters

Name	Type	Default	Required	Description	Added Version
ChildContent	RenderFragment	null	✔️	Gets or sets the content to be rendered within the component.	1.10.0
TabIndex	`int?`	null		Gets or sets the dropdown toggle button tab index.	1.10.0

DropdownActionButton Parameters

Name	Type	Default	Required	Description	Added Version
ChildContent	RenderFragment	null	✔️	Gets or sets the content to be rendered within the component.	1.10.0
Color	`ButtonColor`	Gets or sets the button color.			1.10.0
TabIndex	`int?`	If defined, indicates that its element can be focused and can participates in sequential keyboard navigation.			1.10.0

DropdownMenu Parameters

Name	Type	Default	Required	Description	Added Version
ChildContent	RenderFragment	null	✔️	Gets or sets the content to be rendered within the component.	1.10.0
Position	`DropdownMenuPosition`	`DropdownMenuPosition.Start`		Gets or sets the dropdown menu position.	1.10.0

DropdownHeader Parameters

Name	Type	Default	Required	Description	Added Version
ChildContent	RenderFragment	null	✔️	Gets or sets the content to be rendered within the component.	1.10.0

DropdownItem Parameters

Name	Type	Default	Required	Description	Added Version
Active	bool	false		Gets or sets the dropdown item active state.	1.10.0
ChildContent	RenderFragment	null	✔️	Gets or sets the content to be rendered within the component.	1.10.0
Disabled	bool	false		If true, dropdown item will be disabled.	1.10.0
TabIndex	`int?`	null		Gets or sets the dropdown item tab index.	1.10.0
Target	`Target`	`Target.None`		Gets or sets the target of dropdown item (if the type is link).	1.10.0
To	`string?`	null		Get or sets the link href attribute (if the type is link).	1.10.0
Type	`DropdownItemType`	`DropdownItemType.Button`	Gets or sets the dropdown item type.	1.10.0

Name	Description	Added Version
HideAsync	Hides the dropdown menu of a given navbar or tabbed navigation.	1.10.0
ShowAsync	Shows the dropdown menu of a given navbar or tabbed navigation.	1.10.0
ToggleAsync	Toggles the dropdown menu of a given navbar or tabbed navigation.	1.10.0
UpdateAsync	Updates the position of an element’s dropdown.	1.10.0

Event Type	Description	Added Version
OnHiding	This event is fired immediately when the hide method has been called.	1.10.0
OnHidden	This event is fired when an dropdown element has been hidden from the user (will wait for CSS transitions to complete).	1.10.0
OnShowing	This event fires immediately when the show instance method is called.	1.10.0
OnShown	This event is fired when an dropdown element has been made visible to the user (will wait for CSS transitions to complete).	1.10.0

Examples

Single button

<Dropdown>
    <DropdownToggleButton Color="ButtonColor.Secondary">Dropdown button</DropdownToggleButton>
    <DropdownMenu>
        <DropdownItem To="#" Type="ButtonType.Link">Action</DropdownItem>
        <DropdownItem To="#" Type="ButtonType.Link">Another action</DropdownItem>
        <DropdownItem To="#" Type="ButtonType.Link">Something else here</DropdownItem>
    </DropdownMenu>
</Dropdown>

See the demo here.

Color

<div class="d-flex gap-2 mb-4">
    <Dropdown>
        <DropdownToggleButton Color="ButtonColor.Primary">Primary</DropdownToggleButton>
        <DropdownMenu>
            <DropdownItem To="#" Type="ButtonType.Link">Action</DropdownItem>
            <DropdownItem To="#" Type="ButtonType.Link">Another action</DropdownItem>
            <DropdownItem To="#" Type="ButtonType.Link">Something else here</DropdownItem>
        </DropdownMenu>
    </Dropdown>
    <Dropdown>
        <DropdownToggleButton Color="ButtonColor.Secondary">Secondary</DropdownToggleButton>
        <DropdownMenu>
            <DropdownItem To="#" Type="ButtonType.Link">Action</DropdownItem>
            <DropdownItem To="#" Type="ButtonType.Link">Another action</DropdownItem>
            <DropdownItem To="#" Type="ButtonType.Link">Something else here</DropdownItem>
        </DropdownMenu>
    </Dropdown>
    <Dropdown>
        <DropdownToggleButton Color="ButtonColor.Success">Success</DropdownToggleButton>
        <DropdownMenu>
            <DropdownItem To="#" Type="ButtonType.Link">Action</DropdownItem>
            <DropdownItem To="#" Type="ButtonType.Link">Another action</DropdownItem>
            <DropdownItem To="#" Type="ButtonType.Link">Something else here</DropdownItem>
        </DropdownMenu>
    </Dropdown>
    <Dropdown>
        <DropdownToggleButton Color="ButtonColor.Info">Info</DropdownToggleButton>
        <DropdownMenu>
            <DropdownItem To="#" Type="ButtonType.Link">Action</DropdownItem>
            <DropdownItem To="#" Type="ButtonType.Link">Another action</DropdownItem>
            <DropdownItem To="#" Type="ButtonType.Link">Something else here</DropdownItem>
        </DropdownMenu>
    </Dropdown>
    <Dropdown>
        <DropdownToggleButton Color="ButtonColor.Warning">Warning</DropdownToggleButton>
        <DropdownMenu>
            <DropdownItem To="#" Type="ButtonType.Link">Action</DropdownItem>
            <DropdownItem To="#" Type="ButtonType.Link">Another action</DropdownItem>
            <DropdownItem To="#" Type="ButtonType.Link">Something else here</DropdownItem>
        </DropdownMenu>
    </Dropdown>
    <Dropdown>
        <DropdownToggleButton Color="ButtonColor.Danger">Danger</DropdownToggleButton>
        <DropdownMenu>
            <DropdownItem To="#" Type="ButtonType.Link">Action</DropdownItem>
            <DropdownItem To="#" Type="ButtonType.Link">Another action</DropdownItem>
            <DropdownItem To="#" Type="ButtonType.Link">Something else here</DropdownItem>
        </DropdownMenu>
    </Dropdown>
</div>

See the demo here.

Split button

<div class="d-flex gap-2 mb-4">
    <Dropdown Split="true">
        <DropdownActionButton Color="ButtonColor.Primary">Primary</DropdownActionButton>
        <DropdownToggleButton Color="ButtonColor.Primary" />
        <DropdownMenu>
            <DropdownItem To="#" Type="ButtonType.Link">Action</DropdownItem>
            <DropdownItem To="#" Type="ButtonType.Link">Another action</DropdownItem>
            <DropdownItem To="#" Type="ButtonType.Link">Something else here</DropdownItem>
        </DropdownMenu>
    </Dropdown>
    <Dropdown Split="true">
        <DropdownActionButton Color="ButtonColor.Secondary">Secondary</DropdownActionButton>
        <DropdownToggleButton Color="ButtonColor.Secondary" />
        <DropdownMenu>
            <DropdownItem To="#" Type="ButtonType.Link">Action</DropdownItem>
            <DropdownItem To="#" Type="ButtonType.Link">Another action</DropdownItem>
            <DropdownItem To="#" Type="ButtonType.Link">Something else here</DropdownItem>
        </DropdownMenu>
    </Dropdown>
    <Dropdown Split="true">
        <DropdownActionButton Color="ButtonColor.Success">Success</DropdownActionButton>
        <DropdownToggleButton Color="ButtonColor.Success" />
        <DropdownMenu>
            <DropdownItem To="#" Type="ButtonType.Link">Action</DropdownItem>
            <DropdownItem To="#" Type="ButtonType.Link">Another action</DropdownItem>
            <DropdownItem To="#" Type="ButtonType.Link">Something else here</DropdownItem>
        </DropdownMenu>
    </Dropdown>
    <Dropdown Split="true">
        <DropdownActionButton Color="ButtonColor.Info">Info</DropdownActionButton>
        <DropdownToggleButton Color="ButtonColor.Info" />
        <DropdownMenu>
            <DropdownItem To="#" Type="ButtonType.Link">Action</DropdownItem>
            <DropdownItem To="#" Type="ButtonType.Link">Another action</DropdownItem>
            <DropdownItem To="#" Type="ButtonType.Link">Something else here</DropdownItem>
        </DropdownMenu>
    </Dropdown>
    <Dropdown Split="true">
        <DropdownActionButton Color="ButtonColor.Warning">Warning</DropdownActionButton>
        <DropdownToggleButton Color="ButtonColor.Warning" />
        <DropdownMenu>
            <DropdownItem To="#" Type="ButtonType.Link">Action</DropdownItem>
            <DropdownItem To="#" Type="ButtonType.Link">Another action</DropdownItem>
            <DropdownItem To="#" Type="ButtonType.Link">Something else here</DropdownItem>
        </DropdownMenu>
    </Dropdown>
    <Dropdown Split="true">
        <DropdownActionButton Color="ButtonColor.Danger">Danger</DropdownActionButton>
        <DropdownToggleButton Color="ButtonColor.Danger" />
        <DropdownMenu>
            <DropdownItem To="#" Type="ButtonType.Link">Action</DropdownItem>
            <DropdownItem To="#" Type="ButtonType.Link">Another action</DropdownItem>
            <DropdownItem To="#" Type="ButtonType.Link">Something else here</DropdownItem>
        </DropdownMenu>
    </Dropdown>
</div>

See the demo here.

Sizing

<div class="d-flex gap-2 mb-4">
    <Dropdown Size="Size.Large">
        <DropdownToggleButton Color="ButtonColor.Secondary">Large button</DropdownToggleButton>
        <DropdownMenu>
            <DropdownItem Size="Size.Large" To="#" Type="ButtonType.Link">Action</DropdownItem>
            <DropdownItem To="#" Type="ButtonType.Link">Another action</DropdownItem>
            <DropdownItem To="#" Type="ButtonType.Link">Something else here</DropdownItem>
        </DropdownMenu>
    </Dropdown>
    <Dropdown Size="Size.Large" Split="true">
        <DropdownActionButton Color="ButtonColor.Secondary">Large split button</DropdownActionButton>
        <DropdownToggleButton Color="ButtonColor.Secondary" />
        <DropdownMenu>
            <DropdownItem To="#" Type="ButtonType.Link">Action</DropdownItem>
            <DropdownItem To="#" Type="ButtonType.Link">Another action</DropdownItem>
            <DropdownItem To="#" Type="ButtonType.Link">Something else here</DropdownItem>
        </DropdownMenu>
    </Dropdown>
</div>

Blazor Bootstrap: Dropdown Component - Sizing - Small

<div class="d-flex gap-2 mb-4">
    <Dropdown Size="Size.Small">
        <DropdownToggleButton Color="ButtonColor.Secondary">Small button</DropdownToggleButton>
        <DropdownMenu>
            <DropdownItem To="#" Type="ButtonType.Link">Action</DropdownItem>
            <DropdownItem To="#" Type="ButtonType.Link">Another action</DropdownItem>
            <DropdownItem To="#" Type="ButtonType.Link">Something else here</DropdownItem>
        </DropdownMenu>
    </Dropdown>
    <Dropdown Size="Size.Small" Split="true">
        <DropdownActionButton Color="ButtonColor.Secondary">Small split button</DropdownActionButton>
        <DropdownToggleButton Color="ButtonColor.Secondary" />
        <DropdownMenu>
            <DropdownItem To="#" Type="ButtonType.Link">Action</DropdownItem>
            <DropdownItem To="#" Type="ButtonType.Link">Another action</DropdownItem>
            <DropdownItem To="#" Type="ButtonType.Link">Something else here</DropdownItem>
        </DropdownMenu>
    </Dropdown>
</div>

See the demo here.

Directions

Dropup

To trigger DropdownMenu above elements, add the Direction="DropdownDirection.Dropup" to the Dropdown component.

<div class="d-flex gap-2">
    <Dropdown Direction="DropdownDirection.Dropup">
        <DropdownToggleButton Color="ButtonColor.Secondary">Dropup button with text</DropdownToggleButton>
        <DropdownMenu>
            <DropdownItem To="#" Type="ButtonType.Link">Action</DropdownItem>
            <DropdownItem To="#" Type="ButtonType.Link">Another action</DropdownItem>
            <DropdownItem To="#" Type="ButtonType.Link">Something else here</DropdownItem>
        </DropdownMenu>
    </Dropdown>
    <Dropdown Direction="DropdownDirection.Dropup" Split="true">
        <DropdownActionButton Color="ButtonColor.Secondary">Dropup split button</DropdownActionButton>
        <DropdownToggleButton Color="ButtonColor.Secondary" />
        <DropdownMenu>
            <DropdownItem To="#" Type="ButtonType.Link">Action</DropdownItem>
            <DropdownItem To="#" Type="ButtonType.Link">Another action</DropdownItem>
            <DropdownItem To="#" Type="ButtonType.Link">Something else here</DropdownItem>
        </DropdownMenu>
    </Dropdown>
</div>

See the demo here.

Dropup centered

To center the DropdownMenu above the toggle, add the Direction="DropdownDirection.DropupCentered" to the Dropdown component.

<div class="d-flex gap-2">
    <Dropdown Direction="DropdownDirection.DropupCentered">
        <DropdownToggleButton Color="ButtonColor.Secondary">Centered dropup</DropdownToggleButton>
        <DropdownMenu>
            <DropdownItem To="#" Type="ButtonType.Link">Action</DropdownItem>
            <DropdownItem To="#" Type="ButtonType.Link">Another action</DropdownItem>
            <DropdownItem To="#" Type="ButtonType.Link">Something else here</DropdownItem>
        </DropdownMenu>
    </Dropdown>
</div>

See the demo here.

Dropend

To trigger DropdownMenu at the right of elements, add the Direction="DropdownDirection.Dropend" to the Dropdown component.

<div class="d-flex gap-2">
    <Dropdown Direction="DropdownDirection.Dropend">
        <DropdownToggleButton Color="ButtonColor.Secondary">Dropend</DropdownToggleButton>
        <DropdownMenu>
            <DropdownItem To="#" Type="ButtonType.Link">Action</DropdownItem>
            <DropdownItem To="#" Type="ButtonType.Link">Another action</DropdownItem>
            <DropdownItem To="#" Type="ButtonType.Link">Something else here</DropdownItem>
        </DropdownMenu>
    </Dropdown>
    <Dropdown Direction="DropdownDirection.Dropend" Split="true">
        <DropdownActionButton Color="ButtonColor.Secondary">Split dropend</DropdownActionButton>
        <DropdownToggleButton Color="ButtonColor.Secondary" />
        <DropdownMenu>
            <DropdownItem To="#" Type="ButtonType.Link">Action</DropdownItem>
            <DropdownItem To="#" Type="ButtonType.Link">Another action</DropdownItem>
            <DropdownItem To="#" Type="ButtonType.Link">Something else here</DropdownItem>
        </DropdownMenu>
    </Dropdown>
</div>

See the demo here.

Dropstart

To trigger DropdownMenu at the left of elements, you can add the Direction="DropdownDirection.Dropstart" to the Dropdown component.

<div class="d-flex gap-2">
    <Dropdown Direction="DropdownDirection.Dropstart">
        <DropdownToggleButton Color="ButtonColor.Secondary">Dropstart</DropdownToggleButton>
        <DropdownMenu>
            <DropdownItem To="#" Type="ButtonType.Link">Action</DropdownItem>
            <DropdownItem To="#" Type="ButtonType.Link">Another action</DropdownItem>
            <DropdownItem To="#" Type="ButtonType.Link">Something else here</DropdownItem>
        </DropdownMenu>
    </Dropdown>
    <Dropdown Direction="DropdownDirection.Dropstart" Split="true">
        <DropdownToggleButton Color="ButtonColor.Secondary" />
        <DropdownMenu>
            <DropdownItem To="#" Type="ButtonType.Link">Action</DropdownItem>
            <DropdownItem To="#" Type="ButtonType.Link">Another action</DropdownItem>
            <DropdownItem To="#" Type="ButtonType.Link">Something else here</DropdownItem>
        </DropdownMenu>
        <DropdownActionButton Color="ButtonColor.Secondary">Split dropstart</DropdownActionButton>
    </Dropdown>
</div>

See the demo here.

Active

To style DropdownItem as active, add the Active="true" parameter to the DropdownItem element in the DropdownMenu.

<Dropdown>
    <DropdownToggleButton Color="ButtonColor.Secondary">Dropstart</DropdownToggleButton>
    <DropdownMenu>
        <DropdownItem To="#" Type="ButtonType.Link">Action</DropdownItem>
        <DropdownItem To="#" Type="ButtonType.Link" Active="true">Another action</DropdownItem>
        <DropdownItem To="#" Type="ButtonType.Link">Something else here</DropdownItem>
    </DropdownMenu>
</Dropdown>

See the demo here.

Disabled

To disable the dropdown, set the Disabled parameter to true on the Dropdown component.

<Dropdown Disabled="@isDropdownDisabled">
    <DropdownToggleButton Color="ButtonColor.Secondary">Dropstart</DropdownToggleButton>
    <DropdownMenu>
        <DropdownItem To="#" Type="ButtonType.Link">Action</DropdownItem>
        <DropdownItem To="#" Type="ButtonType.Link">Another action</DropdownItem>
        <DropdownItem To="#" Type="ButtonType.Link">Something else here</DropdownItem>
    </DropdownMenu>
</Dropdown>

<div class="mt-3">
    <Button Color="ButtonColor.Primary" Size="Size.Small" @onclick="EnableDropdown">Enable</Button>
    <Button Color="ButtonColor.Danger" Size="Size.Small" @onclick="DisableDropdown">Disable</Button>
</div>
@code
{
    private bool isDropdownDisabled = true;
    private void EnableDropdown() => isDropdownDisabled = false;
    private void DisableDropdown() => isDropdownDisabled = true;
}

To style a dropdown item as disabled, set the Disabled parameter to true on the DropdownItem element in the DropdownMenu component.

Blazor Bootstrap: Dropdown Component - Disabled (Dropdown Item)

<Dropdown>
    <DropdownToggleButton Color="ButtonColor.Secondary">Dropstart</DropdownToggleButton>
    <DropdownMenu>
        <DropdownItem To="#" Type="ButtonType.Link">Action</DropdownItem>
        <DropdownItem To="#" Type="ButtonType.Link" Disabled="true">Another action</DropdownItem>
        <DropdownItem To="#" Type="ButtonType.Link">Something else here</DropdownItem>
    </DropdownMenu>
</Dropdown>

See the demo here.

By default, a DropdownMenu is automatically positioned at 100% from the top and along the left side of its parent. You can change this with the Position parameter.

To right-align a DropdownMenu, add the Position="DropdownMenuPosition.End" parameter to the DropdownMenu component. Directions are mirrored when using Bootstrap in RTL.

Blazor Bootstrap: Dropdown Component - Menu position

<Dropdown>
    <DropdownToggleButton Color="ButtonColor.Secondary">Right-aligned menu example</DropdownToggleButton>
    <DropdownMenu Position="DropdownMenuPosition.End">
        <DropdownItem To="#" Type="ButtonType.Link">Action</DropdownItem>
        <DropdownItem To="#" Type="ButtonType.Link">Another action</DropdownItem>
        <DropdownItem To="#" Type="ButtonType.Link">Something else here</DropdownItem>
    </DropdownMenu>
</Dropdown>

See the demo here.

Add a header to label sections of actions in any dropdown menu.

Blazor Bootstrap: Dropdown Component - Header

<Dropdown>
    <DropdownToggleButton Color="ButtonColor.Secondary">Dropdown</DropdownToggleButton>
    <DropdownMenu>
        <DropdownHeader>Dropdown header</DropdownHeader>
        <DropdownItem To="#" Type="ButtonType.Link">Action</DropdownItem>
        <DropdownItem To="#" Type="ButtonType.Link">Another action</DropdownItem>
        <DropdownItem To="#" Type="ButtonType.Link">Something else here</DropdownItem>
    </DropdownMenu>
</Dropdown>

See the demo here.

Dividers

Separate groups of related menu items with a divider.

<Dropdown>
    <DropdownToggleButton Color="ButtonColor.Secondary">Dropdown</DropdownToggleButton>
    <DropdownMenu>
        <DropdownItem To="#" Type="ButtonType.Link">Action</DropdownItem>
        <DropdownItem To="#" Type="ButtonType.Link">Another action</DropdownItem>
        <DropdownItem To="#" Type="ButtonType.Link">Something else here</DropdownItem>
        <DropdownDivider>Dropdown header</DropdownDivider>
        <DropdownItem To="#" Type="ButtonType.Link">Separated link</DropdownItem>
    </DropdownMenu>
</Dropdown>

See the demo here.

Text

Place any freeform text within a dropdown menu with text and use spacing utilities. Note that youll likely need additional sizing styles to constrain the menu width.

<Dropdown>
    <DropdownToggleButton Color="ButtonColor.Secondary">Dropdown</DropdownToggleButton>
    <DropdownMenu Class="p-4 text-muted" Style="width: 320px;">
        <p>Some example text that's free-flowing within the dropdown menu.</p>
        <p class="mb-0">And this is more example text.</p>
    </DropdownMenu>
</Dropdown>

See the demo here.

Forms

Put a form within a dropdown menu, or make it into a dropdown menu, and use margin or padding utilities to give it the negative space you require.

@using System.ComponentModel.DataAnnotations

<style>
    .valid.modified:not([type=checkbox]) {
        outline: 1px solid #26b050;
    }

    .invalid {
        outline: 1px solid red;
    }

    .validation-message {
        color: red;
    }
</style>

<Dropdown>
    <DropdownToggleButton Color="ButtonColor.Secondary">Dropdown form</DropdownToggleButton>
    <DropdownMenu Class="px-4 py-3" Style="width:480px;">
        <EditForm EditContext="@editContext" OnValidSubmit="HandleOnValidSubmit">
            <DataAnnotationsValidator />

            <div class="mb-3">
                <label class="form-label">Item Price: <span class="text-danger">*</span></label>
                <NumberInput TValue="decimal?" Value="invoice.Price" ValueExpression="() => invoice.Price" ValueChanged="(value) => PriceChanged(value)" Placeholder="Enter price" />
                <ValidationMessage For="@(() => invoice.Price)" />
            </div>

            <div class="mb-3">
                <label class="form-label">Item Discount:</label>
                <NumberInput TValue="decimal?" Value="invoice.Discount" ValueExpression="() => invoice.Discount" ValueChanged="(value) => DiscountChanged(value)" Placeholder="Enter discount" />
                <ValidationMessage For="@(() => invoice.Discount)" />
            </div>

            <div class="mb-3">
                <label class="form-label">Total Amount: <span class="text-danger">*</span></label>
                <NumberInput TValue="decimal?" @bind-Value="invoice.Total" Disabled="true" Placeholder="Enter total" />
                <ValidationMessage For="@(() => invoice.Total)" />
            </div>

            <div class="row">
                <div class="col-md-12 text-right">
                    <Button Type="ButtonType.Button" Color="ButtonColor.Secondary" Class="float-end" @onclick="ResetForm">Reset</Button>
                    <Button Type="ButtonType.Submit" Color="ButtonColor.Success" Class="float-end me-2">Submit</Button>
                </div>
            </div>
        </EditForm>
    </DropdownMenu>
</Dropdown>

@code {
    private Invoice invoice = new();
    private EditContext editContext = default!;

    protected override void OnInitialized()
    {
        editContext = new EditContext(invoice);
        base.OnInitialized();
    }

    protected override void OnParametersSet()
    {
        CalculateToatl();
        base.OnParametersSet();
    }

    private void PriceChanged(decimal? value)
    {
        invoice.Price = value;
        CalculateToatl();
    }

    private void DiscountChanged(decimal? value)
    {
        invoice.Discount = value;
        CalculateToatl();
    }

    private void CalculateToatl()
    {
        var price = invoice.Price.HasValue ? invoice.Price.Value : 0;
        var discount = invoice.Discount.HasValue ? invoice.Discount.Value : 0;
        invoice.Total = price - discount;
    }

    public void HandleOnValidSubmit()
    {
        Console.WriteLine($"Price: {invoice.Price}");
        Console.WriteLine($"Discount: {invoice.Discount}");
        Console.WriteLine($"Total: {invoice.Total}");
    }

    private void ResetForm()
    {
        invoice = new();
        editContext = new EditContext(invoice);
    }

    public class Invoice
    {
        [Required(ErrorMessage = "Price required.")]
        [Range(60, 500, ErrorMessage = "Price should be between 60 and 500.")]
        public decimal? Price { get; set; } = 232M;

        [Range(0, 50, ErrorMessage = "Discount should be between 0 and 50.")]
        public decimal? Discount { get; set; }

        [Required(ErrorMessage = "Amount required.")]
        [Range(10, 500, ErrorMessage = "Total should be between 60 and 500.")]
        public decimal? Total { get; set; }
    }
}

See the demo here.

Auto close behavior

By default, the DropdownMenu is closed when clicking either inside or outside the DropdownMenu. You can use the AutoClose and AutoCloseBehavior parameters to change this behavior of the Dropdown.

<Dropdown AutoClose="true">
    <DropdownToggleButton Color="ButtonColor.Secondary">Default dropdown</DropdownToggleButton>
    <DropdownMenu>
        <DropdownItem To="#" Type="ButtonType.Link">Menu item</DropdownItem>
        <DropdownItem To="#" Type="ButtonType.Link">Menu item</DropdownItem>
        <DropdownItem To="#" Type="ButtonType.Link">Menu item</DropdownItem>
    </DropdownMenu>
</Dropdown>
<Dropdown AutoClose="true" AutoCloseBehavior="DropdownAutoCloseBehavior.Outside">
    <DropdownToggleButton Color="ButtonColor.Secondary">Clickable outside</DropdownToggleButton>
    <DropdownMenu>
        <DropdownItem To="#" Type="ButtonType.Link">Menu item</DropdownItem>
        <DropdownItem To="#" Type="ButtonType.Link">Menu item</DropdownItem>
        <DropdownItem To="#" Type="ButtonType.Link">Menu item</DropdownItem>
    </DropdownMenu>
</Dropdown>
<Dropdown AutoClose="true" AutoCloseBehavior="DropdownAutoCloseBehavior.Inside">
    <DropdownToggleButton Color="ButtonColor.Secondary">Clickable inside</DropdownToggleButton>
    <DropdownMenu>
        <DropdownItem To="#" Type="ButtonType.Link">Menu item</DropdownItem>
        <DropdownItem To="#" Type="ButtonType.Link">Menu item</DropdownItem>
        <DropdownItem To="#" Type="ButtonType.Link">Menu item</DropdownItem>
    </DropdownMenu>
</Dropdown>
<Dropdown AutoClose="false">
    <DropdownToggleButton Color="ButtonColor.Secondary">Manual close</DropdownToggleButton>
    <DropdownMenu>
        <DropdownItem To="#" Type="ButtonType.Link">Menu item</DropdownItem>
        <DropdownItem To="#" Type="ButtonType.Link">Menu item</DropdownItem>
        <DropdownItem To="#" Type="ButtonType.Link">Menu item</DropdownItem>
    </DropdownMenu>
</Dropdown>

See the demo here.

Methods

<Dropdown @ref="dropdown1">
    <DropdownToggleButton Color="ButtonColor.Secondary">Dropdown button</DropdownToggleButton>
    <DropdownMenu>
        <DropdownItem To="#" Type="ButtonType.Link">Action</DropdownItem>
        <DropdownItem To="#" Type="ButtonType.Link">Another action</DropdownItem>
        <DropdownItem To="#" Type="ButtonType.Link">Something else here</DropdownItem>
    </DropdownMenu>
</Dropdown>

<Button Color="ButtonColor.Primary" @onclick="ShowAsync">Show</Button>
<Button Color="ButtonColor.Primary" @onclick="HideAsync">Hide</Button>
<Button Color="ButtonColor.Primary" @onclick="ToggleAsync">Toggle</Button>

@code{
    private Dropdown dropdown1 = default!;

    private async Task ShowAsync() => await dropdown1.ShowAsync();
    private async Task HideAsync() => await dropdown1.HideAsync();
    private async Task ToggleAsync() => await dropdown1.ToggleAsync();
}

See the demo here.

Events

All dropdown events are fired at the toggling element and then bubbled up.

<Dropdown OnHiding="OnDropdownHidingAsync"
          OnHidden="OnDropdownHiddenAsync"
          OnShowing="OnDropdownShowingAsync"
          OnShown="OnDropdownShownAsync">
    <DropdownToggleButton Color="ButtonColor.Secondary">Dropdown button</DropdownToggleButton>
    <DropdownMenu>
        <DropdownItem To="#" Type="ButtonType.Link">Action</DropdownItem>
        <DropdownItem To="#" Type="ButtonType.Link">Another action</DropdownItem>
        <DropdownItem To="#" Type="ButtonType.Link">Something else here</DropdownItem>
    </DropdownMenu>
</Dropdown>

@code {
    List<string> messages = new List<string>();

    private void OnDropdownHidingAsync() => messages.Add(new("OnHiding"));
    private void OnDropdownHiddenAsync() => messages.Add(new("OnHidden"));
    private void OnDropdownShowingAsync() => messages.Add(new("OnShowing"));
    private void OnDropdownShownAsync() => messages.Add(new("OnShown"));
}

See the demo here.

Blazor Dropdown

Dropdown Parameters​

DropdownToggleButton Parameters​

DropdownActionButton Parameters​

DropdownMenu Parameters​

DropdownHeader Parameters​

DropdownItem Parameters​

Dropdown Methods​

Dropdown Events​

Examples​

Single button​

Color​

Split button​

Sizing​

Directions​

Dropup​

Dropup centered​

Dropend​

Dropstart​

Active​

Disabled​

Menu position​

Menu content​

Header​

Dividers​

Text​

Forms​

Auto close behavior​

Methods​

Events​

Dropdown Parameters

DropdownToggleButton Parameters

DropdownActionButton Parameters

DropdownMenu Parameters

DropdownHeader Parameters

DropdownItem Parameters

Dropdown Methods

Dropdown Events

Examples

Single button

Color

Split button

Sizing

Directions

Dropup

Dropup centered

Dropend

Dropstart

Active

Disabled

Menu position

Menu content

Header

Dividers

Text

Forms

Auto close behavior

Methods

Events