DxGrid.LayoutAutoSaving Event

Fires when the grid’s layout changes.

Namespace: DevExpress.Blazor

Assembly: DevExpress.Blazor.v23.2.dll

NuGet Package: DevExpress.Blazor

Declaration

[Parameter]
public Func<GridPersistentLayoutEventArgs, Task> LayoutAutoSaving { get; set; }

Parameters

Type	Description
GridPersistentLayoutEventArgs	A GridPersistentLayoutEventArgs object that defines data for this event.

Remarks

The Grid allows you to save and restore the component’s layout when necessary. The saved layout object includes the current page, column sort order/direction, column position, filter values, and grouped columns (information about expanded rows in groups is not included).

Handle the LayoutAutoSaving event to save the grid’s layout when users change component UI characteristics mentioned above. As an alternative, call the SaveLayout() method to save the layout on demand (for example, on a button click).

Use the Grid event argument and its members to obtain additional information about the Grid. The Layout argument specifies the new grid layout. To restore the saved layout, pass a value of the Layout event argument to any of the following members:

• The LayoutAutoLoading event’s e.Layout argument.
• The LoadLayout(GridPersistentLayout) method’s parameter.

Important

DevExpress components can incorrectly serialize custom enumeration values in criteria operators. Refer to the following troubleshooting topic for more information: The XXX enumeration type is not registered for the parse operation…

The code below demonstrates how to ensure the grid’s layout persistence. When the component layout changes, the LayoutAutoSaving event handler saves the updated layout to the browser’s local storage. Once the page is reloaded or restored, the LayoutAutoLoading event handler loads the most recently-saved layout from the local storage and applies it to the grid.

Razor

@using System.Text.Json
@inject NwindDataService NwindDataService
@inject IJSRuntime JSRuntime

@if(PreRendered) {
    <DxGrid @ref="Grid" Data="@GridData" AutoExpandAllGroupRows="true"
        ColumnResizeMode="GridColumnResizeMode.NextColumn"
        ShowGroupPanel="true" ShowFilterRow="true"
        PageSizeSelectorVisible="true" PageSizeSelectorAllRowsItemVisible="true"
        LayoutAutoLoading="Grid_LayoutAutoLoading"
        LayoutAutoSaving="Grid_LayoutAutoSaving">
        <Columns>
            <DxGridDataColumn FieldName="Country" GroupIndex="0" />
            <DxGridDataColumn FieldName="City" GroupIndex="1" />
            <DxGridDataColumn FieldName="CompanyName" />
            <DxGridDataColumn FieldName="Address" />
            <DxGridDataColumn FieldName="Phone" />
            <DxGridDataColumn FieldName="ContactName" />
        </Columns>
    </DxGrid>
} else {
    <em>Loading...</em>
}

@code {
    const string LocalStorageKey = "Grid-LayoutPersistence-Data";

    bool PreRendered { get; set; }
    IGrid Grid { get; set; }
    object GridData { get; set; }

    protected override async Task OnInitializedAsync() {
        GridData = await NwindDataService.GetCustomersAsync();
    }

    protected override void OnAfterRender(bool firstRender) {
        if(firstRender) {
            PreRendered = true;
            StateHasChanged();
        }
    }

    async Task Grid_LayoutAutoLoading(GridPersistentLayoutEventArgs e) {
        e.Layout = await LoadLayoutFromLocalStorageAsync();
    }

    async Task Grid_LayoutAutoSaving(GridPersistentLayoutEventArgs e) {
        await SaveLayoutToLocalStorageAsync(e.Layout);
    }

    async Task<GridPersistentLayout> LoadLayoutFromLocalStorageAsync() {
        try {
            var json = await JSRuntime.InvokeAsync<string>("localStorage.getItem", LocalStorageKey);
            return JsonSerializer.Deserialize<GridPersistentLayout>(json);
        } catch {
            // Mute exceptions for the server prerender stage
            return null;
        }
    }

    async Task SaveLayoutToLocalStorageAsync(GridPersistentLayout layout) {
        try {
            var json = JsonSerializer.Serialize(layout);
            await JSRuntime.InvokeVoidAsync("localStorage.setItem", LocalStorageKey, json);
        } catch {
            // Mute exceptions for the server prerender stage
        }
    }
}

Invoice

using System;
using System.Collections.Generic;
using System.Runtime.InteropServices;

namespace BlazorDemo.Data.Northwind {
    public class Invoice {
        public string ShipName { get; set; }
        public string ShipAddress { get; set; }
        public string ShipCity { get; set; }
        public string ShipRegion { get; set; }
        public string ShipPostalCode { get; set; }
        public string ShipCountry { get; set; }
        public string CustomerId { get; set; }
        public string CustomerName { get; set; }
        public string Address { get; set; }
        public string City { get; set; }
        public string Region { get; set; }
        public string PostalCode { get; set; }
        public string Country { get; set; }
        public string Salesperson { get; set; }
        public int OrderId { get; set; }
        public DateTime? OrderDate { get; set; }
        public DateTime? RequiredDate { get; set; }
        public DateTime? ShippedDate { get; set; }
        public string ShipperName { get; set; }
        public int ProductId { get; set; }
        public string ProductName { get; set; }
        public decimal UnitPrice { get; set; }
        public short Quantity { get; set; }
        public float Discount { get; set; }
        public decimal? ExtendedPrice { get; set; }
        public decimal? Freight { get; set; }
    }
}

Customer

using System;
using System.Collections.Generic;
using System.Runtime.InteropServices;

namespace BlazorDemo.Data.Northwind {
    public partial class Customer {
        public Customer() {
            Orders = new HashSet<Order>();
        }

        public string CustomerId { get; set; }
        public string CompanyName { get; set; }
        public string ContactName { get; set; }
        public string ContactTitle { get; set; }
        public string Address { get; set; }
        public string City { get; set; }
        public string Region { get; set; }
        public string PostalCode { get; set; }
        public string Country { get; set; }
        public string Phone { get; set; }
        public string Fax { get; set; }

        public virtual ICollection<Order> Orders { get; set; }
    }
}

NwindDataService.Invoices

using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using BlazorDemo.Data.Northwind;
using BlazorDemo.DataProviders;

namespace BlazorDemo.Services {
    public partial class NwindDataService {
        public Task<IEnumerable<Invoice>> GetInvoicesAsync(CancellationToken ct = default) {
            // Return your data here
        }
    }
}

NwindDataService.Customers

using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using BlazorDemo.Data.Northwind;
using BlazorDemo.DataProviders;

namespace BlazorDemo.Services {
    public partial class NwindDataService {
        public Task<IEnumerable<Customer>> GetCustomersAsync(CancellationToken ct = default) {
            // Return your data here
        }
    }
}

Program.cs

// ...
builder.Services.AddScoped<NwindDataService>();

Run Demo: Save and Restore the Layout

You can use the approach to implement different default layouts for mobile and desktop devices:

• Save the layouts to a database instead of browser storage in the LayoutAutoSaving event handler.
• In the LayoutAutoLoading event handler, use the DxLayoutBreakpoint component to load the layout based on the screen size.