Soenneker.Blazor.DataTables 4.0.2439

Soenneker.Blazor.DataTables

A Blazor interop library for DataTables

This library simplifies the integration of DataTables into Blazor applications, providing access to options, events, etc. A demo project showcasing common usages is included.

Diligence was taken to align the Blazor API with JS. Refer to the DataTables documentation for details. This is a work-in-progress; contribution is welcomed.

Installation

dotnet add package Soenneker.Blazor.DataTables

Add the following to your Startup.cs file

public void ConfigureServices(IServiceCollection services)
{
    services.AddDataTablesInteropAsScoped();
}

Usage

@using Soenneker.Blazor.DataTables

<DataTable Options="_options">
    <thead>
        <tr>
            <th>Name</th>
            <th>Position</th>
            <th>Office</th>
            <th>Age</th>
            <th>Start date</th>
            <th>Salary</th>
        </tr>
    </thead>
    <tbody>
        <tr>
            <td>John Doe</td>
            <td>Developer</td>
            <td>London</td>
            <td>28</td>
            <td>2017/04/25</td>
            <td>$320,800</td>
        </tr>
    </tbody>
</DataTable>

@code{

    private readonly DataTableOptions _options_ = new()
    {
        Searching = true,
        LengthChange = false,
        Info = false,
        Paging = false,
        Order = [new object[] {0, "asc"}]
    };
}

Custom Processing Indicators

When using server-side processing, you can override the default DataTables processing indicator with custom Blazor content. This feature allows you to:

• Display custom Blazor components as the processing indicator
• Use any Blazor markup, components, and styling
• Disable the processing indicator entirely

Basic Usage

<DataTable Options="tableOptions" OnServerSideRequest="HandleServerSideRequest">
    <ProcessingIndicator>
        <div class="text-center">
            <div class="spinner-border text-primary" role="status"></div>
            <div class="mt-2">Loading data from server...</div>
        </div>
    </ProcessingIndicator>
    <ChildContent>
        <thead>
            <tr>
                <th data-data="id">ID</th>
                <th data-data="name">Name</th>
                <th data-data="email">Email</th>
            </tr>
        </thead>
        <tbody>
        </tbody>
    </ChildContent>
</DataTable>

Continuation Token Support

The DataTables component supports continuation token-based pagination, which is useful for services like Azure Table Storage, Cosmos DB, or other cloud storage solutions that use continuation tokens instead of traditional offset-based pagination.

How Continuation Tokens Work

The component automatically emulates traditional DataTables pagination behavior while using continuation tokens under the hood:

1. First Request: No continuation token is sent
2. Server Response: Server returns data along with a continuation token for the next page
3. Subsequent Requests: The continuation token from the previous response is sent with the next request
4. Last Page: When there are no more pages, the server returns null for the continuation token
5. Pagination Display: DataTables shows traditional pagination controls (Previous/Next buttons, page numbers) that work seamlessly with continuation tokens

Basic Usage

<DataTable @ref="_dataTable"
           OnServerSideRequest="HandleServerSideRequest"
           Options="_tableOptions">
    <thead>
        <tr>
            <th data-data="id">ID</th>
            <th data-data="name">Name</th>
            <th data-data="email">Email</th>
        </tr>
    </thead>
    <tbody>
    </tbody>
</DataTable>

@code {
    private DataTable _dataTable = null!;
    private readonly DataTableOptions _tableOptions = new()
    {
        ServerSide = true,
        PageLength = 10
    };

    private async Task<DataTableServerResponse> HandleServerSideRequest(DataTableServerSideRequest request)
    {
        // The request.ContinuationToken will contain the token from the previous response
        // or null for the first request
        
        var result = await YourService.GetDataAsync(
            pageSize: request.Length,
            continuationToken: request.ContinuationToken,
            searchTerm: request.Search?.Value,
            orderBy: GetOrderByColumn(request.Order)
        );
        
        // Return the response with the continuation token for the next page
        // Note: The component automatically calculates appropriate TotalRecords and TotalFilteredRecords
        // to make DataTables think it's using traditional pagination
        return DataTableServerResponse.Success(
            draw: request.Draw,
            recordsTotal: result.TotalRecords,
            recordsFiltered: result.TotalFilteredRecords,
            data: result.Data,
            continuationToken: result.NextContinuationToken // null when no more pages
        );
    }
}

Controlling Continuation Tokens

You can programmatically control continuation tokens using the DataTable component methods:

// Reset pagination to start from the beginning
_dataTable.ResetContinuationToken();

// Set a specific continuation token for the next request
_dataTable.SetContinuationToken("your-custom-token");

Backward Navigation Support

The component automatically stores continuation tokens for visited pages, enabling backward navigation:

1. Original Token Storage: When you navigate to a page, the component stores the original continuation token used to reach that page
2. Consistent Backward Navigation: When you click "Previous" or navigate to a previous page, the component uses the same original token for that page
3. Token Consistency: Navigating back to a page multiple times will always use the same continuation token that was originally used to reach that page
4. Efficient Navigation: If a direct token isn't available for a requested page, the component finds the closest available token and uses it
5. Seamless UX: Users can navigate forward and backward through pages just like with traditional pagination

This ensures that your server-side logic receives the same continuation tokens when users navigate back to previously visited pages, maintaining consistency with your data source.

Implementation Notes

• Automatic Handling: The component automatically manages continuation tokens between requests
• Pagination Emulation: The component automatically calculates appropriate TotalRecords and TotalFilteredRecords values to make DataTables think it's using traditional offset-based pagination
• Virtual Page Tracking: The component maintains a virtual page state that maps to continuation tokens, allowing DataTables pagination controls to work seamlessly
• Backward Navigation: The component stores continuation tokens for visited pages, enabling backward navigation to previous pages
• Token Storage: Continuation tokens are stored for each visited page, allowing efficient navigation in both directions
• Fingerprinting: The component uses request fingerprinting to detect when search/filter parameters change and automatically resets the continuation token