ant-design-blazor/components/select/internal/SelectContent.razor

@namespace AntDesign.Internal
@using OneOf;

@switch (ParentSelect.SelectMode)
{
    case SelectMode.Default:
        {
            var selectedOption = ParentSelect.SelectedOptions.FirstOrDefault();

            <div class="@Prefix-selector">
                <span class="@Prefix-selection-search">
                    <input @ref="ParentSelect._inputRef"
                           @oninput="OnInput"
                           id="@ParentSelect.Id"
                           value="@SearchValue"
                           role="combobox"
                           class="@Prefix-selection-search-input"
                           autocomplete="off"
                           aria-owns="@(ParentSelect.Id)_list"
                           aria-expanded="@IsOverlayShow"
                           aria-autocomplete="list"
                           aria-controls="@(ParentSelect.Id)_list" />
                </span>

                @if (ShowPlaceholder)
                {
                    <span class="ant-select-selection-placeholder">@Placeholder</span>
                }
                else if (string.IsNullOrEmpty(SearchValue) && selectedOption != null)
                {
                    var showValue = GetOptionShowValue(selectedOption);
                    @if (showValue.IsT0)
                    {
                        <span class="ant-select-selection-item">@showValue.AsT0 </span>
                    }
                    else
                    {
                        <span class="ant-select-selection-item">@showValue.AsT1 </span>
                    }
                }
            </div>


            break;
        }
    default:
        {
            <div class="@Prefix-selector">
                @foreach (var option in ParentSelect.SelectedOptions)
                {
                    if (ParentSelect.TagRender != null)
                    {
                        <span>@ParentSelect.TagRender(GetProperties(option))</span>
                    }
                    else
                    {
                        var showValue = GetOptionShowValue(option);
                        <span class="@Prefix-selection-item">
                            <span class="@Prefix-selection-item-content">
                                @if (showValue.IsT0)
                                {
                                    @showValue.AsT0
                                }
                                else
                                {
                                    @showValue.AsT1
                                }
                            </span>

                            @if (ParentSelect.SelectMode == SelectMode.Tags)
                            {
                                <span unselectable="on" aria-hidden="true" style="user-select: none;" class="@Prefix-selection-item-remove"
                                      @onclick="()=>OnRemoveSelected.InvokeAsync(option)" @onclick:stopPropagation="true">
                                    <Icon Type="close"></Icon>
                                </span>
                            }
                        </span>
                    }
                }

                <span class="@Prefix-selection-search" style="width:@InputWidth">
                    <input @ref="ParentSelect._inputRef"
                           @oninput="OnInput"
                           @onkeyup="OnKeyUp"
                           @bind-value="@SearchValue"
                           id="@ParentSelect.Id"
                           role="combobox"
                           class="@Prefix-selection-search-input"
                           autocomplete="off"
                           aria-owns="@(ParentSelect.Id)_list"
                           aria-expanded="@IsOverlayShow"
                           aria-autocomplete="list"
                           aria-controls="@(ParentSelect.Id)_list" />

                    <span class="@Prefix-selection-search-mirror" aria-hidden="true">&nbsp;</span>
                </span>

                @if (ShowPlaceholder)
                {
                    <span class="ant-select-selection-placeholder">@Placeholder</span>
                }
            </div>
            break;
        }
}

@if (ParentSelect.ShowArrow && ParentSelect.SelectMode == SelectMode.Default)
{
    if (ParentSelect.SuffixIcon != null)
    {
        <span class="ant-select-arrow" unselectable="on" aria-hidden="true" style="user-select: none;">
            @ParentSelect.SuffixIcon
        </span>
    }
    else if (ParentSelect.Loading)
    {
        <span class="ant-select-arrow ant-select-arrow-loading" unselectable="on" aria-hidden="true" style="user-select: none;">
            <Icon Type="loading"></Icon>
        </span>
    }
    else
    {
        <span class="ant-select-arrow" unselectable="on" aria-hidden="true" style="user-select: none;">
            @if (ParentSelect.ShowSearch && IsOverlayShow)
            {
                <Icon Type="search"></Icon>
            }
            else
            {
                <Icon Type="down"></Icon>
            }
        </span>
        @if (ParentSelect.AllowClear && ParentSelect.HasValue)
        {
            <span class="ant-select-clear" unselectable="on" aria-hidden="true" style="user-select: none;" @onclick="OnClearClick">
                <Icon Type="close-circle"></Icon>
            </span>
        }
    }
}

@code
{
    [CascadingParameter(Name = "ParentSelect")]
    public Select ParentSelect { get; set; }

    [Parameter]
    public string Prefix { get; set; }

    [Parameter]
    public string SearchValue { get; set; }

    [Parameter]
    public string Placeholder { get; set; }

    [Parameter]
    public string InputWidth { get; set; }

    [Parameter]
    public bool IsOverlayShow { get; set; }

    [Parameter]
    public EventCallback<ChangeEventArgs> OnInput { get; set; }

    [Parameter]
    public EventCallback<SelectOption> OnRemoveSelected { get; set; }

    [Parameter]
    public bool ShowPlaceholder { get; set; }

    [Parameter]
    public Func<SelectOption, OneOf<string, RenderFragment>> GetOptionShowValue { get; set; }

    protected bool IsShowSearch()
    {
        if (ParentSelect.SelectMode == SelectMode.Default)
        {
            return ParentSelect.ShowSearch;
        }
        return true;
    }

    protected async Task OnClearClick(MouseEventArgs _)
    {
        await ParentSelect.ResetState();
    }

    protected async void OnKeyUp(KeyboardEventArgs e)
    {
        if (e.Code == "Enter")
        {
            await ParentSelect.TransSearchValueToTag();
        }
    }

    protected Properties GetProperties(SelectOption option)
    {
        return new Properties
        {
            Closable = true,
            Value = option.Value,
            Label = option.Label,
            OnClose = Action
        };

        void Action(MouseEventArgs e) => OnRemoveSelected.InvokeAsync(option);
    }
}