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GridView component for Blazor

Easy way for displaying lits of items in table



Still development not completely finished and rapidly continue. Next versions can contain breaking changes

Breaking change after support .NET Core 3.1 Preview 1

In Blazor WASM you have to manually add into index.html links to the css and js FlexGrid files

<link href="_content/Blazor.FlexGrid/FlexGridStyles.css" rel="stylesheet" />
<link rel="stylesheet" href="_content/Blazor.FlexGrid/fontawesome/css/fontawesome.css" />
<link rel="stylesheet" href="_content/Blazor.FlexGrid/fontawesome/css/all.css" />
<link rel="stylesheet" href="_content/Blazor.FlexGrid/fontawesome/css/regular.css" />
<link rel="stylesheet" href="_content/Blazor.FlexGrid/fontawesome/css/solid.css" />
<link rel="stylesheet" href="_content/Blazor.FlexGrid/fontawesome/css/svg-with-js.css" />
<link rel="stylesheet" href="_content/Blazor.FlexGrid/fontawesome/css/v4-shims.css" />
<script src="_content/Blazor.FlexGrid/flexGridIntereop.js"></script>

Version 0.11.0 contains new Triggers feature more info in wiki


NuGet Pre Release

After nuget installation you must create in Blazor.Client app Linker.xml file because nuget uses some features which are not supported in default mono managed interpreter from WebAssembly

  <assembly fullname="mscorlib">
    <!-- Preserve all methods on WasmRuntime, because these are called by JS-side code
    to implement timers. Fixes -->
    <type fullname="System.Threading.WasmRuntime" />
  <assembly fullname="System.Core">
    <!-- This is required by JSon.NET and any expression.Compile caller -->
    <type fullname="System.Linq.Expressions*" />
    <type fullname="System.Linq.EnumerableRewriter*" />
    <type fullname="System.Linq.Queryable*" />
    <type fullname="System.Linq.Enumerable*" />
  <!-- Name of the entry point assembly -->
  <assembly fullname="Blazor.FlexGrid.Demo.Client" />

And Add this into csproj of client project

	<BlazorLinkerDescriptor Include="Linker.xml" />


public void ConfigureServices(IServiceCollection services)

Setup Blazor App as RazorComponents AKA ServerSide Blazor App

public void ConfigureServices(IServiceCollection services)

Note: Add the following line to the Configure(...) method of your Startup.cs file.

public void Configure(IApplicationBuilder app, IWebHostEnvironment env)

From your index.(cs)html add references

<link rel="stylesheet" href="Blazor.FlexGrid/FlexGridStyles.css" />
<link rel="stylesheet" href="Blazor.FlexGrid/fontawesome/css/fontawesome.css" />
<link rel="stylesheet" href="Blazor.FlexGrid/fontawesome/css/all.css" />
<link rel="stylesheet" href="Blazor.FlexGrid/fontawesome/css/regular.css" />
<link rel="stylesheet" href="Blazor.FlexGrid/fontawesome/css/solid.css" />
<link rel="stylesheet" href="Blazor.FlexGrid/fontawesome/css/svg-with-js.css" />
<link rel="stylesheet" href="Blazor.FlexGrid/fontawesome/css/v4-shims.css" />
<script src="Blazor.FlexGrid/flexGridIntereop.js"></script>

For properly working of LazyLoaded functionality some services must be registered in IoC. Because in web scenario FlexGrid uses Http services which are provided in IoC
by default, but in server side scenario you have to provide these services.

public void ConfigureServices(IServiceCollection services)
	services.TryAddScoped(typeof(ILazyDataSetLoader<>), typeof(NullLazyDataSetLoader<>));
    services.TryAddScoped(typeof(ILazyDataSetItemManipulator<>), typeof(NullLazyDataSetItemManipulator<>));
    services.TryAddScoped(typeof(ICreateItemHandle<,>), typeof(NullCreateItemHandler<,>));

These services are registered by default in IoC if you want for your grid use funtionality like lazy loading data, inline editing or create item form
you have to provide these services for your models.

In your Blazor component add Tag helper and required usings

@addTagHelper *, Blazor.FlexGrid


@addTagHelper *, Blazor.FlexGrid
@using Blazor.FlexGrid.Demo.Shared
@using Blazor.FlexGrid.DataAdapters
@inject HttpClient Http
@page "/grid"

<h1>Weather forecast</h1>

<GridView DataAdapter="@dataAdapter" PageSize="5"></GridView>

    CollectionTableDataAdapter<WeatherForecast> dataAdapter;

    protected override async Task OnInitAsync()
        var forecast = await Http.GetJsonAsync<WeatherForecast[]>("/api/SampleData/WeatherForecastsSimple");
        dataAdapter = new CollectionTableDataAdapter<WeatherForecast>(forecast);



You do not need to define information about columns and components will render columns by properties of object type which is associated
with table data adapter which provide data set for Table component. Value for column is provided by ToString method on the property type.
Or you can configure some behavior for tables and columns by using fluent api which is supported in classes where interface IEntityTypeConfiguration is implemented.

public class WeatherForecastGridConfiguration : IEntityTypeConfiguration<WeatherForecast>
    public void Configure(EntityTypeBuilder<WeatherForecast> builder)
        builder.Property(e => e.Date)
            .HasValueFormatter(d => d.ToShortDateString());

        builder.Property(e => e.Summary)
            .HasValueFormatter(s => $"{s}!");

        builder.Property(e => e.TemperatureC)

        builder.Property(e => e.TemperatureF)

And provide this configuration

var serviceProvider = new BrowserServiceProvider(services =>
    services.AddFlexGrid(cfg =>
        cfg.ApplyConfiguration(new WeatherForecastGridConfiguration());

Data Adapters

You can use simple CollectionTableDataAdapter which requires collection of items.

    CollectionTableDataAdapter<WeatherForecast> dataAdapter;

    protected override async Task OnInitAsync()
        var forecast = await Http.GetJsonAsync<WeatherForecast[]>("/api/SampleData/WeatherForecastsSimple");
        dataAdapter = new CollectionTableDataAdapter<WeatherForecast>(forecast);

Another data adapter type is LazyLoadedTableDataAdapter which support lazy loading data from API. This type of adapter
is registered in dependency injection conatiner and you must only provide LazyLoadingOptins to table component.

@addTagHelper *, Blazor.FlexGrid
@using Blazor.FlexGrid.Demo.Shared
@using Blazor.FlexGrid.DataAdapters
@using Blazor.FlexGrid.DataSet.Options
@page "/lazyloadedgrid"
@inject HttpClient Http
@inject LazyLoadedTableDataAdapter<WeatherForecast> forecastAdapter

<GridView DataAdapter="@forecastAdapter" LazyLoadingOptions="@(new LazyLoadingOptions() { DataUri = "/api/SampleData/WeatherForecasts" })" PageSize="10"></GridView>

Also you must provide the server side part

public IActionResult WeatherForecasts(int pageNumber, int pageSize, SortingParams sortingParams)
    var rng = new Random();

    var items = Enumerable.Range(1, 100).Skip(pageSize * pageNumber).Take(pageSize).Select(index =>
                new WeatherForecast
                    Date = DateTime.Now.AddDays(index),
                    TemperatureC = rng.Next(-20, 55),
                    Summary = Summaries[rng.Next(Summaries.Length)]


    items = string.IsNullOrEmpty(sortingParams.SortExpression)
        ? items
        : items.AsQueryable().OrderBy(sortingParams.SortExpression).ToList();

    return Ok(
            Items = items,
            TotalCount = 100

After that you have fully pageable and sortable table with lazy loaded data after you select new page

Permission restriction

You can configure permission restricion of showing/editing values for each column in table for current logged user. You only have to do 3 things.
First create class which implements interface ICurrentUserPermission. Second provide configuration for permission restriction for exmaple:

public void Configure(EntityTypeBuilder<Customer> builder)
	builder.Property(c => c.Email)
		.HasReadPermissionRestriction(perm => perm.IsInRole("Read"))
		.HasWritePermissionRestriction(perm => perm.IsInRole("Write"));

And last thing is register ICurrentUserPermission into DI container as Singleton.

Blazor components in column

You can configure column value for rendering Blazor component this way:
First add using Blazor.FlexGrid.Components.Configuration.
Second inject required service BlazorComponentColumnCollection into HTML of component where you use FlexGrid
And the last thing you have to provide RenderFragment for columns

@inject BlazorComponentColumnCollection<WeatherForecast> Collection

    RenderFragment<WeatherForecast> weatherTemp = (weather) => @<BlazorButton>@weather.Summary</BlazorButton>;
	Collection.AddColumnValueRenderFunction(w => w.Summary, weatherTemp);

Also you can use registration of fragment in startup configuration

RenderFragment<Customer> customerEmailComponent = (Customer customer) => delegate (RenderTreeBuilder rendererTreeBuilder)
    var internalBuilder = new BlazorRendererTreeBuilder(rendererTreeBuilder);

builder.Property(c => c.Email)


You can define which column can be filtered.

builder.Property(e => e.TemperatureF)

For filter exists two modes, for standard TableDataSet is filtering done on client side across whole collection of items.
For LazyTableDataSet is filter object sended to the server. More info how it is works is here


You can enable dynamic grouping functionality for table

builder.EnableGrouping(options =>
    options.GroupPageSize = 15;

You can define page size for grouped items. Grouping works in two modes, for standard TableDataSet, grouping is done on client side across whole collection of items.
For LazyTableDataSet, GroupExpression is sent to the server. More info how it is works is here

Create item form

You can very easily have Create item form for your models. You can even configure different type of model for create item form
than is used for rendering in FlexGrid. You can also specify the return type from your Api which can be different than input.
Now the restriction for model is that have default constructor
Configuration example:

builder.AllowCreateItem<WeatherForecastCreateModel, WeatherForecast>(conf =>
    conf.CreatePermissionRestriction = p => p.IsInRole("TestRole");
    conf.CreateUri = "/api/SampleData/WeatherForecast";

You can also restrict the creation of items only for some users. Important property is CreateUri which must be filled. Form also includes
validations which are run after every change. Submit can be done only if form is in Valid state. For rendering, two layout types are used.
You can have one column layout or you can have two columns layout. Now the behavior is that every model that have more than 6 properties the
two column layout is used. You can also write your own layout. You only have to inherit from BaseCreateItemFormLayout and also you must
create your own layout provider by creating a class which implements IFormLayoutProvider and register this provider to IoC.
Properties are in default layouts rendered in order that they are written in class.
After item is succesfully created the NewItemCreated event is fired.
You can also change the modal dialog css classes by using:

builder.AppendCssClasses(conf =>
    conf.CreateFormCssClasses.ModalSize = "modal-lg";

Master / Detail

You can have multiple DataSets related together and rendered only with one FlexGrid component. If you have object that have property which is a collection,
the FlexGrid component automatically finds this and will render this kind of object as Master / Detail grid.

Example configuration

public void Configure(EntityTypeBuilder<Customer> builder)
    builder.HasDetailRelationship<Order>(c => c.Id, o => o.CustomerId)

    builder.HasDetailRelationship<CustomerAddress>(c => c.Id, o => o.CustomerId)
        .HasCaption("Customer addresses");

public void Configure(EntityTypeBuilder<Order> builder)
    builder.HasDetailRelationship(o => o.OrderItems)
        .HasCaption("Order products");

For correct working of Master / Detail grid you must configure relationships between objects. Also you can define some additional options for related grid component.
If you want to use LazyTableDataSet you must provide url address for loading. This is not required in ServerSide solution because you have to create your own DataSet
which implements ILazyDataSetLoader.

Example page with Master/Detail grid

@addTagHelper *, Blazor.FlexGrid
@using Blazor.FlexGrid.Demo.Shared
@using Blazor.FlexGrid.DataAdapters
@inject HttpClient Http
@inject MasterTableDataAdapterBuilder<Customer> MasterAdapterBuilder
@inject LazyLoadedTableDataAdapter<Order> ordersAdapter
@page "/masterdetailgrid"


<GridView DataAdapter="@customersMasterDataAdapter" PageSize="5"></GridView>

    CollectionTableDataAdapter<Customer> customerDataAdapter;
    CollectionTableDataAdapter<CustomerAddress> customerAddressesDataAdapter;
    MasterTableDataAdapter<Customer> customersMasterDataAdapter;

    protected override async Task OnInitAsync()
        var customers = await Http.GetJsonAsync<Customer[]>("/api/Customer/Customers");
        var customersAddresses = await Http.GetJsonAsync<CustomerAddress[]>("/api/Customer/CustomersAddresses");
        customerDataAdapter = new CollectionTableDataAdapter<Customer>(customers);
        customerAddressesDataAdapter = new CollectionTableDataAdapter<CustomerAddress>(customersAddresses);

        customersMasterDataAdapter = MasterAdapterBuilder

For building Master / Detail TableDataSet is used MasterTableDataAdapter which is registered in DI container.
Master / Detail usage you can find in ServerSide Blazor demo project

Inline editing

You can use inline editing features by configuring grid

public void Configure(EntityTypeBuilder<Order> builder)
	// Or
    builder.AllowInlineEdit(conf =>
        conf.AllowDeleting = true;
        conf.DeletePermissionRestriction = perm => perm.IsInRole("TestRole");

    builder.DoNotUseDeleteConfirmDialog(); // Disable confirmation dialog before delete operation

You can also configure which columns will be editable for current logged in user, see Permission restriction section. If you are using
CollectionTableDataAdapter changes are saved only into local object in list. For saving to the server you have to write your own functionality.
If you are using LazyLoadedTableDataAdapter and Client/Server mode you must provide a url for updating item.

<GridView DataAdapter="@forecastAdapter"
          LazyLoadingOptions="@(new LazyLoadingOptions() {
                                    DataUri = "/api/SampleData/WeatherForecasts",
                                    PutDataUri = "/api/SampleData/UpdateWeatherForecast",
                                    DeleteUri = "/api/SampleData/Delete/{Id}" })"

The Http request will be sent to the server. For fully working delete feature you have to properly set DeleteUri of LazyLoadingOptions.
The url contains a template where you must specify the name of object property in { } at the end (for example {Id}) which is the key and this key is sent to the action method on server side.

Or if the Grid is used as detail

builder.HasDetailRelationship<Order>(c => c.Id, o => o.CustomerId)


You can subscribe to some events which FlexGrid provides. The only requirements are add using
@using Blazor.FlexGrid.Components.Events and register EventHandler in HTML of Grid component.

Suppoerted events:


You can override some default CssClasses by your own CssClasses by using fluent api configuration.

public void Configure(EntityTypeBuilder<WeatherForecast> builder)
	builder.AppendCssClasses(conf =>
		conf.Table = "my-table";
		conf.TableBody = "my-table-body";
		conf.TableCell = "my-table-cell";
		conf.TableHeader = "my-table-header";
		conf.TableHeaderCell = "my-table-header-cell";
		conf.TableHeaderRow = "my-table-header-row";
		conf.TableRow = "my-table-row";

Contributions and feedback

Please feel free to use the component, open issues, fix bugs or provide feedback.


Create proper Docs
Add UnitTests
More fluent API configuration
Filtration support

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