Sve-Blazor-InfiniteScroll

Simplistic implementation of an infinite scroll component for Blazor.

Installation

1. Install the NuGet package:

   > dotnet add package Sve.Blazor.InfiniteScroll
   
   OR
   
   PM> Install-Package Sve.Blazor.InfiniteScroll
   

   Use the --version option to specify a specific version to install.

   Or use the build in NuGet package manager of your favorite IDEA. Simply search for Sve.Blazor.InfiniteScroll, select a version and hit install.

2. Import the component:

   Add the following using statement @using Sve.Blazor.InfiniteScroll.Components to one of the following:

   • For global import add it to your _Imports.razor file
   • For a scoped import add it to your desired Blazor component

3. Reference js interop file:

   Add <script src="_content/Sve.Blazor.InfiniteScroll/js/Observer.js"></script> to your _Host.cshtml or your index.html

Usage

Simply wrap the desired content in the InfiniteScroll component and add any empty html element with a unique id after the data elements:

<InfiniteScroll ObserverTargetId="observerTarget" ObservableTargetReached="(e) => FetchForecasts()">
	<ul>
    		@foreach (var forecast in forecasts)
        	{
        		<li class="list-group-item">@forecast.Date: @forecast.TemperatureC-@forecast.TemperatureF (@forecast.Summary)</li>
		}

        	@*The target element that we observe. Once this is reached the callback will be triggered.*@
        	<li class="list-group-item" id="observerTarget"></li>
    	</ul>
</InfiniteScroll>

@code {
    private List<WeatherForecast> forecasts = new List<WeatherForecast>();

    protected override async Task OnInitializedAsync()
    {
        await FetchForecasts(); // Initial data
    }

    private async Task FetchForecasts()
    {
        var fetchedForecasts = await ForecastService.GetForecastAsync(DateTime.Now, amount: 20);
        forecasts.AddRange(fetchedForecasts); // Make sure to use AddRange() to append the new items
    }
}

The InfiniteScroll component requires two properties:

• ObserverTargetId: The id of the observable html element

• ObservableTargetReached: The callback that will be triggered once the observable item is reached

License

This project is licensed under the MIT License - see the LICENSE file for details