‫استفاده از لنگر (anchor) برای اسکرول به قسمت خاصی از صفحه در Blazor Server

@page "/test"

<nav>
    <!-- یک روش -->
    <a href="#section2">Section2</a>

    <!-- روش دیگر -->
    <NavLink href="#section2">Section2</NavLink>    
</nav>

@* ... *@


<h2 id="section2">It's Section2.</h2>
@* ... *@

@inject IJSRuntime JSRuntime
@inject NavigationManager NavigationManager
@implements IDisposable
@code {
    protected override void OnInitialized()
    {
        NavigationManager.LocationChanged += OnLocationChanged;
    }

    protected override async Task OnAfterRenderAsync(bool firstRender)
    {
        await ScrollToFragment();
    }

    public void Dispose()
    {
        NavigationManager.LocationChanged -= OnLocationChanged;
    }

    private async void OnLocationChanged(object sender, LocationChangedEventArgs e)
    {
        await ScrollToFragment();
    }

    private async Task ScrollToFragment()
    {
        var uri = new Uri(NavigationManager.Uri, UriKind.Absolute);
        var fragment = uri.Fragment;
        if (fragment.StartsWith('#'))
        {
            // Handle text fragment (https://example.org/#test:~:text=foo)
            // https://github.com/WICG/scroll-to-text-fragment/
            var elementId = fragment.Substring(1);
            var index = elementId.IndexOf(":~:", StringComparison.Ordinal);
            if (index > 0)
            {
                elementId = elementId.Substring(0, index);
            }

            if (!string.IsNullOrEmpty(elementId))
            {
                await JSRuntime.InvokeVoidAsync("BlazorScrollToId", elementId);
            }
        }
    }
}

function BlazorScrollToId(id) {
            const element = document.getElementById(id);
            if (element instanceof HTMLElement) {
                element.scrollIntoView({
                    behavior: "smooth",
                    block: "start",
                    inline: "nearest"
                });
            }
        }

@page "/"

<PageTitle>Index</PageTitle>

<a href="#section2">
    <h1>Section2</h1>
</a>

<SurveyPrompt Title="How is Blazor working for you?" />

<div style="height: 2000px">

</div>

<div id="section2">
    <h2>It's Section2. </h2>
</div>

<AnchorNavigation />

using Microsoft.AspNetCore.Components;
using Microsoft.AspNetCore.Components.Rendering;
using Microsoft.AspNetCore.Components.Routing;
using System.Diagnostics.CodeAnalysis;

namespace TestAnchorNavigation;

public class AnchorNavigation: ComponentBase, IDisposable
{
    private bool _setFocus;

    [Inject] private NavigationManager NavManager { get; set; } = default!;
    [Parameter] public RenderFragment? ChildContent { get; set; }
    [Parameter] public string? BookmarkName { get; set; }
    [DisallowNull] public ElementReference? Element { get; private set; }

    protected override void BuildRenderTree(RenderTreeBuilder builder)
    {
        builder.OpenElement(0, "span");
        builder.AddAttribute(2, "tabindex", "-1");
        builder.AddContent(3, this.ChildContent);
        builder.AddElementReferenceCapture(4, this.SetReference);
        builder.CloseElement();
    }

    protected override void OnInitialized()
        => NavManager.LocationChanged += this.OnLocationChanged;

    protected override void OnParametersSet()
        => _setFocus = this.IsMe();

    private void SetReference(ElementReference reference)
        => this.Element = reference;

    private void OnLocationChanged(object? sender, LocationChangedEventArgs e)
    {
        if (this.IsMe())
        {
            _setFocus = true;
            this.StateHasChanged();
        }
    }

    protected async override Task OnAfterRenderAsync(bool firstRender)
    {
        if (_setFocus)
            await this.Element!.Value.FocusAsync(false);

        _setFocus = false;
    }

    private bool IsMe()
    {
        string? elementId = null;

        var uri = new Uri(this.NavManager.Uri, UriKind.Absolute);
        if (uri.Fragment.StartsWith('#'))
        {
            elementId = uri.Fragment.Substring(1);
            return elementId == BookmarkName;
        }
        return false;
    }

    public void Dispose()
        => NavManager.LocationChanged -= this.OnLocationChanged;
}

@page "/"

<PageTitle>Index</PageTitle>

<NavLink href="#section2">
    <h1>Section2</h1>
</NavLink>

<SurveyPrompt Title="How is Blazor working for you?" />

<div style="height: 2000px">

</div>

<AnchorNavigation BookmarkName="section2">
      <h2>It's Section2. </h2>
</AnchorNavigation>