Blazor Modal

Use Blazor Bootstrap modal component to add dialogs to your site for lightboxes, user notifications, or completely custom content.

Examples #

<Modal @ref="modal" Title="Modal title">
    <BodyTemplate>
        Modal body text goes here.
    </BodyTemplate>
    <FooterTemplate>
        <Button Color="ButtonColor.Secondary" @onclick="OnHideModalClick">Close</Button>
        <Button Color="ButtonColor.Primary">Save changes</Button>
    </FooterTemplate>
</Modal>

<Button Color="ButtonColor.Primary" @onclick="OnShowModalClick">Show Modal</Button>

@code {
    private Modal modal = default!;

    private async Task OnShowModalClick()
    {
        await modal.ShowAsync();
    }

    private async Task OnHideModalClick()
    {
        await modal.HideAsync();
    }
}

Render different components dynamically within the modal without iterating through possible types or using conditional logic.

If dynamically-rendered components have component parameters, pass them as an IDictionary. The string is the parameter's name, and the object is the parameter's value.

Razor

<Modal @ref="modal" />

<Button Color="ButtonColor.Primary" @onclick="ShowEmployeeComponent">Show Employee Component</Button>

@code {
    private Modal modal = default!;

    private async Task ShowEmployeeComponent()
    {
        var parameters = new Dictionary<string, object>();
        parameters.Add("EmployeeId", 321);
        await modal.ShowAsync<EmployeeDemoComponent1>(title: "Employee Details", parameters: parameters);
    }
}

EmployeeDemoComponent1.razor

Razor

<div class="row">
    <div class="col-5 col-md-3 text-end">Employee Id :</div>
    <div class="col-7 col-md-9">@EmployeeId</div>
</div>
<div class="row">
    <div class="col-5 col-md-3 text-end">First Name :</div>
    <div class="col-7 col-md-9">@employee?.FirstName</div>
</div>
<div class="row">
    <div class="col-5 col-md-3 text-end">Last Name :</div>
    <div class="col-7 col-md-9">@employee?.LastName</div>
</div>

@code {
    private Employee? employee;

    [Parameter] public int EmployeeId { get; set; }

    protected override void OnInitialized()
    {
        // get employee with {EmployeeId} from DB

        employee = new Employee { FirstName = "Vikram", LastName = "Reddy" };

        base.OnInitialized();
    }
}

Pass event callbacks to a dynamic component #

Event callbacks (EventCallback) can be passed in its parameter dictionary.

In the following parent component example, the ShowDTMessage method assigns a string with the current time to message, and the value of message is rendered. The parent component passes the callback method, ShowDTMessage in the parameter dictionary:

The string key is the callback method's name, OnClickCallback.
The object value is created by EventCallbackFactory.Create for the parent callback method, ShowDTMessage.

Razor

<Modal @ref="modal" />

<Button Color="ButtonColor.Primary" @onclick="ShowEmployeeComponent">Show Employee Component</Button>

<div class="mt-3 bg-success text-white bg-opacity-75">
    @message
</div>

@code {
    private Modal modal = default!;
    private string? message;

    private async Task ShowEmployeeComponent()
    {
        var parameters = new Dictionary<string, object>();
        parameters.Add("EmployeeId", 322);
        parameters.Add("OnclickCallback", EventCallback.Factory.Create<MouseEventArgs>(this, ShowDTMessage));
        await modal.ShowAsync<EmployeeDemoComponent2>(title: "Employee Details", parameters: parameters);
    }

    private void ShowDTMessage(MouseEventArgs e) => message = $"The current DT is: {DateTime.Now}.";
}

EmployeeDemoComponent2.razor

Razor

<div class="row">
    <div class="col-5 col-md-3 text-end">Employee Id :</div>
    <div class="col-7 col-md-9">@EmployeeId</div>
</div>
<div class="row">
    <div class="col-5 col-md-3 text-end">First Name :</div>
    <div class="col-7 col-md-9">@employee?.FirstName</div>
</div>
<div class="row">
    <div class="col-5 col-md-3 text-end">Last Name :</div>
    <div class="col-7 col-md-9">@employee?.LastName</div>
</div>

<Button class="mt-3" Color="ButtonColor.Success" Type="ButtonType.Button" @onclick="OnClickCallback">
    Trigger a Parent component method
</Button>

@code {
    private Employee? employee;

    [Parameter] public int EmployeeId { get; set; }

    [Parameter] public EventCallback<MouseEventArgs> OnClickCallback { get; set; }

    protected override void OnInitialized()
    {
        // get employee with {EmployeeId} from DB

        employee = new Employee { FirstName = "Sagar", LastName = "Reddy" };

        base.OnInitialized();
    }
}

Static backdrop #

When UseStaticBackdrop is set to true, the modal will not close when clicking outside it. Click the button below to try it.

<Modal @ref="modal" title="Modal title" UseStaticBackdrop="true" CloseOnEscape="false">
    <BodyTemplate>
        I will not close if you click outside me. Don't even try to press escape key.
    </BodyTemplate>
    <FooterTemplate>
        <Button Color="ButtonColor.Secondary" @onclick="OnHideModalClick">Close</Button>
        <Button Color="ButtonColor.Primary">Understood</Button>
    </FooterTemplate>
</Modal>

<Button Color="ButtonColor.Primary" @onclick="OnShowModalClick">Launch static backdrop modal</Button>

@code {
    private Modal modal = default!;

    private async Task OnShowModalClick()
    {
        await modal.ShowAsync();
    }

    private async Task OnHideModalClick()
    {
        await modal.HideAsync();
    }
}

Scrolling long content #

When modals become too long for the user’s viewport or device, they scroll independent of the page itself. Try the demo below to see what we mean.

<Modal @ref="modal" title="Modal title">
    <BodyTemplate>
        <p style="margin-bottom: 100vh;">This is some placeholder content to show the scrolling behavior for modals. Instead of repeating the text the modal, we use an inline style set a minimum height, thereby extending the length of the overall modal and demonstrating the overflow scrolling. When content becomes longer than the height of the viewport, scrolling will move the modal as needed.</p>
        <p>This content should appear at the bottom after you scroll.</p>
    </BodyTemplate>
    <FooterTemplate>
        <Button Color="ButtonColor.Secondary" @onclick="OnHideModalClick">Close</Button>
        <Button Color="ButtonColor.Primary">Save changes</Button>
    </FooterTemplate>
</Modal>

<Button Color="ButtonColor.Primary" @onclick="OnShowModalClick">Launch demo modal</Button>

@code {
    private Modal modal = default!;

    private async Task OnShowModalClick()
    {
        await modal.ShowAsync();
    }

    private async Task OnHideModalClick()
    {
        await modal.HideAsync();
    }
}

You can also create a scrollable modal that allows scroll the modal body by adding IsScrollable="true".

<Modal @ref="modal" title="Modal title" IsScrollable="true">
    <BodyTemplate>
        <p style="margin-bottom: 100vh;">This is some placeholder content to show the scrolling behavior for modals. Instead of repeating the text the modal, we use an inline style set a minimum height, thereby extending the length of the overall modal and demonstrating the overflow scrolling. When content becomes longer than the height of the viewport, scrolling will move the modal as needed.</p>
        <p>This content should appear at the bottom after you scroll.</p>
    </BodyTemplate>
    <FooterTemplate>
        <Button Color="ButtonColor.Secondary" @onclick="OnHideModalClick">Close</Button>
        <Button Color="ButtonColor.Primary">Save changes</Button>
    </FooterTemplate>
</Modal>

<Button Color="ButtonColor.Primary" @onclick="OnShowModalClick">Launch demo modal</Button>

@code {
    private Modal modal = default!;

    private async Task OnShowModalClick()
    {
        await modal.ShowAsync();
    }

    private async Task OnHideModalClick()
    {
        await modal.HideAsync();
    }
}

Vertically centered #

Add IsVerticallyCentered="true" to vertically center the modal.

<Modal @ref="modal" title="Modal title" IsVerticallyCentered="true">
    <BodyTemplate>
        This is a vertically centered modal.
    </BodyTemplate>
    <FooterTemplate>
        <Button Color="ButtonColor.Secondary" @onclick="OnHideModalClick">Close</Button>
        <Button Color="ButtonColor.Primary">Save changes</Button>
    </FooterTemplate>
</Modal>

<Button Color="ButtonColor.Primary" @onclick="OnShowModalClick">Vertically centered modal</Button>

@code {
    private Modal modal = default!;

    private async Task OnShowModalClick()
    {
        await modal.ShowAsync();
    }

    private async Task OnHideModalClick()
    {
        await modal.HideAsync();
    }
}

<Modal @ref="modal" title="Modal title" IsVerticallyCentered="true" IsScrollable="true">
    <BodyTemplate>
        <p style="margin-bottom: 100vh;">This is some placeholder content to show the scrolling behavior for modals. Instead of repeating the text the modal, we use an inline style set a minimum height, thereby extending the length of the overall modal and demonstrating the overflow scrolling. When content becomes longer than the height of the viewport, scrolling will move the modal as needed.</p>
        <p>This content should appear at the bottom after you scroll.</p>
    </BodyTemplate>
    <FooterTemplate>
        <Button Color="ButtonColor.Secondary" @onclick="OnHideModalClick">Close</Button>
        <Button Color="ButtonColor.Primary">Save changes</Button>
    </FooterTemplate>
</Modal>

<Button Color="ButtonColor.Primary" @onclick="OnShowModalClick">Vertically centered scrollable modal</Button>

@code {
    private Modal modal = default!;

    private async Task OnShowModalClick()
    {
        await modal.ShowAsync();
    }

    private async Task OnHideModalClick()
    {
        await modal.HideAsync();
    }
}

Optional sizes #

Modals have three optional sizes. These sizes kick in at certain breakpoints to avoid horizontal scrollbars on narrower viewports.

<Modal @ref="xlModal" title="Extra large modal" Size="ModalSize.ExtraLarge">
    <BodyTemplate>...</BodyTemplate>
</Modal>
<Modal @ref="lgModal" title="Large modal" Size="ModalSize.Large">
    <BodyTemplate>...</BodyTemplate>
</Modal>
<Modal @ref="smModal" title="Small modal" Size="ModalSize.Small">
    <BodyTemplate>...</BodyTemplate>
</Modal>

<Button Color="ButtonColor.Primary" @onclick="() => xlModal.ShowAsync()">Extra large modal</Button>
<Button Color="ButtonColor.Primary" @onclick="() => lgModal.ShowAsync()">Large modal</Button>
<Button Color="ButtonColor.Primary" @onclick="() => smModal.ShowAsync()">Small modal</Button>

@code {
    private Modal xlModal = default!;
    private Modal lgModal = default!;
    private Modal smModal = default!;
}

<Modal @ref="modal" title="Full screen" Fullscreen="ModalFullscreen.Always">
    <BodyTemplate>...</BodyTemplate>
</Modal>
<Modal @ref="smModal" title="Full screen below sm" Fullscreen="ModalFullscreen.SmallDown">
    <BodyTemplate>...</BodyTemplate>
</Modal>
<Modal @ref="mdModal" title="Full screen below md" Fullscreen="ModalFullscreen.MediumDown">
    <BodyTemplate>...</BodyTemplate>
</Modal>
<Modal @ref="lgModal" title="Full screen below lg" Fullscreen="ModalFullscreen.LargeDown">
    <BodyTemplate>...</BodyTemplate>
</Modal>
<Modal @ref="xlModal" title="Full screen below xl" Fullscreen="ModalFullscreen.ExtraLargeDown">
    <BodyTemplate>...</BodyTemplate>
</Modal>
<Modal @ref="xxlModal" title="Full screen below xxl" Fullscreen="ModalFullscreen.ExtraExtraLargeDown">
    <BodyTemplate>...</BodyTemplate>
</Modal>

<Button Color="ButtonColor.Primary" @onclick="() => modal.ShowAsync()">Full screen</Button>
<Button Color="ButtonColor.Primary" @onclick="() => smModal.ShowAsync()">Full screen below sm</Button>
<Button Color="ButtonColor.Primary" @onclick="() => mdModal.ShowAsync()">Full screen below md</Button>
<Button Color="ButtonColor.Primary" @onclick="() => lgModal.ShowAsync()">Full screen below lg</Button>
<Button Color="ButtonColor.Primary" @onclick="() => xlModal.ShowAsync()">Full screen below xl</Button>
<Button Color="ButtonColor.Primary" @onclick="() => xxlModal.ShowAsync()">Full screen below xxl</Button>

@code {
    private Modal modal = default!;
    private Modal smModal = default!;
    private Modal mdModal = default!;
    private Modal lgModal = default!;
    private Modal xlModal = default!;
    private Modal xxlModal = default!;
}

Events #

Blazor Bootstrap modal class exposes a few events for hooking into modal functionality.

<Modal @ref="modal"
       title="Modal title"
       OnShowing="OnModalShowing"
       OnShown="OnModalShown"
       OnHiding="OnModalHiding"
       OnHidden="OnModalHidden"
       OnHidePrevented="OnModalHidePrevented">

    <BodyTemplate>
        Modal body text goes here.
    </BodyTemplate>

    <FooterTemplate>
        <Button Color="ButtonColor.Secondary" @onclick="OnHideModalClick">Close</Button>
        <Button Color="ButtonColor.Primary">Save changes</Button>
    </FooterTemplate>

</Modal>

<Button Color="ButtonColor.Primary" @onclick="OnShowModalClick">Show Modal</Button>

@code {
    private Modal modal = default!;

    [Inject] ToastService ToastService { get; set; } = default!;

    private async Task OnShowModalClick()
    {
        await modal.ShowAsync();
    }

    private async Task OnHideModalClick()
    {
        await modal.HideAsync();
    }

    private void OnModalShowing()
    {
        ToastService.Notify(new (ToastType.Primary, $"Event: Showing called. DateTime: {DateTime.Now}"));
    }

    private void OnModalShown()
    {
        ToastService.Notify(new (ToastType.Success, $"Event: Show called. DateTime: {DateTime.Now}"));
    }

    private void OnModalHiding()
    {
        ToastService.Notify(new(ToastType.Danger, $"Event: Hiding called. DateTime: {DateTime.Now}"));
    }

    private void OnModalHidden()
    {
        ToastService.Notify(new(ToastType.Warning, $"Event: Hide called. DateTime: {DateTime.Now}"));
    }

    private void OnModalHidePrevented()
    {
        ToastService.Notify(new(ToastType.Info, $"Event: Hide Prevented called. DateTime: {DateTime.Now}"));
    }
}

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Blazor Modal

Examples #

Pass event callbacks to a dynamic component #

Static backdrop #

Scrolling long content #

Vertically centered #

Optional sizes #

Events #

Links

Guides

Community

Blazor Modal

Examples #

Dynamic component as modal #

Pass event callbacks to a dynamic component #

Static backdrop #

Scrolling long content #

Vertically centered #

Optional sizes #

Fullscreen Modal #

Events #

Links

Guides

Community