This repo contain PopupContainer component. It's purpose is to simplify Popup usage in Blazor.

• Install nuget package Kebechet.Blazor.Components.Popup
• In your Program.cs add:

builder.Services.AddPopupServices();

• Ideally in MainLayout.razor put <PopupContainer /> component. This component is controlled from PopupService and it's purpose is to render popup content.
  • ⚠️ At one time only 1 popup can be rendered.
• In component where you would like to render popup inject Popup service like:

@inject PopupService _popupService

• Create Popup content component. E.g. YesNoPopup.razor that implements interface IPopupReturnable<T> with return type you need to get from the Popup. This popup content will be rendered inside PopupContainer.
  • ⚠️ I recommend to always use nullable type like IPopupReturnable<bool?> because that way you can differentiate between person clicking NO/False and person closing the popup be clicking outside of it.
  • ⚠️ The child component must have [Parameter] at the beginning of the OnReturnValue property, otherwise it won't work.

YesNoPopup.razor part

@using Blazor.Components.Popup.Components;

<span>Do you want to save changes ?</span>
<button @onclick="()=>Process(true)">Yes, I do</button>
<button @onclick="()=>Process(false)">No, I don't</button>

YesNoPopup.razor.cs part

using Blazor.Components.Popup.Components;
using Microsoft.AspNetCore.Components;

namespace BlazorApp7.Pages;

public partial class YesNoComponent : IPopupReturnable<bool?>
{
    [Parameter] public EventCallback<bool?> OnReturnValue { get; set; }

    public async Task Process(bool val)
    {
        await OnReturnValue.InvokeAsync(val);
    }
}

• then in your component where you would like to render popup:
  • inject PopupService
  • add functionality to trigger popup. In our case button onClick event
  • and finally use Show method to show YesNoPopup and get result from it

YourComponent.razor

@inject PopupService _popupService

<button @onclick="Test">Trigger popup</button>

@code{
    public async Task Test()
    {
        var isSuccess =  await _popupService.Show(new YesNoPopup());
        if (isSuccess is null)
        {
            // user closed the popup
        } 
        else if(isSuccess == true)
        {
            // user clicked the button that returns true
        } 
        else if(isSuccess == false){
            // user clicked the button that returns false
        }
    }
}

• ENJOY 🎉

• Add support for multiple popups at the same time
  • Probably through ref like: https://demos.blazorbootstrap.com/confirm-dialog
• Consider using Dialog HTML element instead of div
  • https://www.youtube.com/watch?v=q1fsBWLpYW4&t=33s