Creating a popup in Blazor using C# method

Question

I have a simple page index.razor with a button:

<a class="btn btn-login" @onclick="RedirectPage" >Log in</a>

<div
    @bind-Visible="@InvalidLogin"
    BodyText="Error">
</div>

@code{
    InvalidLogin {get; set;} = false;
}

Where the function RedirectPage checks if values are valid. If they are not, I want a popup giving information:

private void RedirectPage
{
    this.InvalidLogin = true;
}

This function is in the index.razor.cs and has been added with @using in the correct namespace.

How can I create it so that a popup shows up whenever the button is clicked?

When you say "popup" are you talking about a modal dialog? If so, which CSS framework are you using? If so, check out this answer and my answer, stackoverflow.com/questions/71882886/… — MrC aka Shaun Curtis
– MrC aka Shaun Curtis, Commented Apr 25, 2022 at 20:04
Understand that on the client side a pop-up is just a div or other element that is styled to appear in front of other elements. One very simple way of achieving this is to put a div in your Layout page. You can pass your layout page to all its children using the “this” keyword, And then use a method on the layout page to change the CSS class of the pop-up element. — Bennyboy1973
– Bennyboy1973, Commented Apr 26, 2022 at 15:00

Sukhrob Ilyosbekov · Accepted Answer · 2022-04-25 20:20:35Z

18

You can create a simple popup (or modal dialog) component. Below, I wrote a sample popup razor component using Bootstrap 5 toast component.

Popup.razor file

@{
    var showClass = IsVisible ? "d-block" : "d-none";
}

<div class="toast-container p-3 @showClass" data-bs-autohide="true" data-bs-delay="5000">
    <div class="toast show" role="alert" aria-live="assertive" aria-atomic="true">
        <div class="toast-header">
            <strong class="me-auto">@HeaderText</strong>
            <button type="button" class="btn-close" aria-label="Close" @onclick="Close"></button>
        </div>

        <div class="toast-body">
            @BodyText
        </div>
    </div>
</div>

@code {
    [Parameter]
    public bool IsVisible { get; set; }

    [Parameter]
    public EventCallback<bool> IsVisibleChanged { get; set; }

    [Parameter]
    public string? HeaderText { get; set; }

    [Parameter]
    public string? BodyText { get; set; }

    public void Show(string bodyText, string headerText = "")
    {
        HeaderText = headerText;
        BodyText = bodyText;
        IsVisible = true;
        StateHasChanged();
    }

    private void Close()
    {
        HeaderText = string.Empty;
        BodyText = string.Empty;
        IsVisible = false;
        StateHasChanged();
    }
}

Using the Popup razor component in your code:

<a class="btn btn-login" @onclick="RedirectPage" >Log in</a>

<Popup @ref="popupRef" />

@code{
    private Popup popupRef;
    
    private void RedirectPage()
    {
        // Shows the popup at the center of the screen
        popupRef.Show("Popup body text");
    }
}

answered Apr 25, 2022 at 20:20

Sukhrob Ilyosbekov

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2 Comments

B.Quaink Over a year ago

Thanks, with some changes I got this to work.

Mohsen Saleh Over a year ago

Thanks for your simple way, how to close it when user clicks outside of popup?

Norman · Accepted Answer · 2024-01-09 09:57:53Z

How to create a dialog without a dependency on a third party library.

I had to use a minimal amount of js as the new HTML5 <dialog... element can only be opened in dialog mode with it .showModal() not by manipulating attributes.

wwwroot/scripts/dialogJsInterop.js

export function showDialog(element, parm) {
    return element.showModal();
}

export function closeDialog(element, parm) {
    return element.close();
}

Dialog.razor

<CascadingValue Value=@this IsFixed=true >
    <dialog @ref="@dialogElement" @attributes=@CapturedAttributes>
    @if(visible)
    {
        @ChildContent
    }
    </dialog>
</CascadingValue>

Dialog.razor.cs

public partial class Dialog : ComponentBase, IAsyncDisposable
{
    private readonly Lazy<Task<IJSObjectReference>> moduleTask;
    private ElementReference dialogElement;
    private bool visible = false;

    public Dialog()
    {
        moduleTask = new(() => jsRuntime.InvokeAsync<IJSObjectReference>(
            identifier: "import",
            args: "./scripts/dialogJsInterop.js")
        .AsTask());
    }

    [Inject]
    private IJSRuntime jsRuntime { get; set; }

    [Parameter]
    public RenderFragment ChildContent { get; set; }

    [Parameter(CaptureUnmatchedValues = true)]
    public Dictionary<string, object> CapturedAttributes { get; set; }

    public async ValueTask ShowDialogAsync()
    {
        var module = await moduleTask.Value;
        await module.InvokeVoidAsync("showDialog", dialogElement);
        visible = true;
    }

    public async ValueTask CloseDialogAsync()
    {
        var module = await moduleTask.Value;
        await module.InvokeVoidAsync("closeDialog", dialogElement);
        visible = false;
    }

    public async ValueTask DisposeAsync()
    {
        if (moduleTask.IsValueCreated)
        {
            var module = await moduleTask.Value;
            await module.DisposeAsync();
        }
    }
}

A this stage you have a dialog that works.

I added the following components to make it more convenient. Note: I do use bootstrap from here forward for styling, this could be changed easily to tailwind for example.

DialogCloseButton.razor

<button @attributes=CapturedAttributes @onclick=@CloseDialog />

DialogCloseButton.razor.cs

public partial class DialogCloseButton : ComponentBase
{
    [CascadingParameter]
    public Dialog Dialog { get; set; }

    [Parameter(CaptureUnmatchedValues = true)]
    public Dictionary<string, object> CapturedAttributes { get; set; } = new Dictionary<string, object>
    {
        { "class", "btn btn-close" }
    };

    private async Task CloseDialog() => await Dialog.CloseDialogAsync();
}

DialogCloseButton.razor.css

.btn:focus {
    box-shadow: none;
}

DialogLayout.razor

<div class="d-flex flex-row justify-content-between border-bottom border-1">
    <div class="flex-fill p-1 ps-3 fw-bolder user-select-none app-gradient text-white">
        @Header
    </div>
    <div class="p-1">
        <DialogCloseButton />
    </div>
</div>
<div class="p-3">
    @Content
</div>

DialogLayout.razor.cs

public partial class DialogLayout
{
    [Parameter]
    public RenderFragment Header { get; set; }

    [Parameter]
    public RenderFragment Content { get; set; }
}

Usage :

<Dialog @ref=@dialog class="p-0 border rounded shadow">
    <DialogLayout>
        <Header>
           <MessagesIcon Size=16 /> Add Message
        </Header>
        <Content>
            <MessageFormView />
        </Content>
    </DialogLayout>
</Dialog>
<button class="btn btn-outline-success" @onclick=@OpenDialog>Add Message</button>
@code {
    private Dialog dialog;

    ...

    private async Task OpenDialog() => await dialog.ShowDialogAsync();
}

Dylan El Bar · Accepted Answer · 2022-04-26 08:10:33Z

Here is a very minimal example of what you ask (I put everything in the index.razor file, but you can use CSS isolation and a dedicated .cs file for all the content inside the @code{} part.

@page "/index"
<style>
    .active {
        display: block;
    }
    .inactive {
        display: none;
    }
</style>

<a class="btn btn-login" @onclick="RedirectPage" >Log in</a>

<div class="@PopupClass">
    Error: @ErrorText
</div>

@code{
    bool InvalidLogin {get; set;} = false;

    string PopupClass => InvalidLogin ? "active" : "inactive";
    public string ErrorText { get; set; } = "Example of exception";

    private void RedirectPage()
    {
        this.InvalidLogin = !this.InvalidLogin;
    }
}

Of course you will need to appropriate yourself this example in order to implement more concrete business logic.

user571203 · Accepted Answer · 2023-12-23 12:41:55Z

0

There is not necessary to create your own popup logic from scratch - many libraries with components available in NuGet Package Manager. Just open it and search 'blazor' - and you can find many already created components. As example - Syncfusion.Blazor.Popups.

answered Dec 23, 2023 at 12:41

user571203

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