feat(Cascader): add IsClearable parameter

src/BootstrapBlazor.Server/Components/Samples/Cascaders.razor

@@ -60,9 +60,12 @@
 </DemoBlock>
 
 <DemoBlock Title="@Localizer["Block3Title"]" Introduction="@Localizer["Block3Intro"]" Name="Bind">
+    <section ignore>
+        @((MarkupString)Localizer["Block3Desc"].Value)
+    </section>
     <div class="row g-3">
         <div class="col-12 col-sm-6">
-            <Cascader Color="Color.Primary" Items="@_items" @bind-Value="@Value" />
+            <Cascader Color="Color.Primary" Items="@_items" @bind-Value="@Value" IsClearable="true" />
         </div>
         <div class="col-12 col-sm-6">
             <BootstrapInput readonly @bind-Value="@Value" />

src/BootstrapBlazor.Server/Components/Samples/SelectObjects.razor

@@ -10,7 +10,7 @@
     <section ignore>
         @((MarkupString)Localizer["NormalDesc"].Value)
     </section>
-    <SelectObject @bind-Value="_value" GetTextCallback="GetTextCallback" IsClearable>
+    <SelectObject @bind-Value="_value" GetTextCallback="GetTextCallback" IsClearable="true">
         <ListView TItem="ListViews.Product" Items="@Products" OnListViewItemClick="item => OnListViewItemClick(item, context)">
             <BodyTemplate Context="value">
                 <Card>

src/BootstrapBlazor.Server/Locales/en-US.json

@@ -2284,6 +2284,7 @@
     "Block2Intro": "Cascading selection is not available",
     "Block3Title": "Two-way binding",
     "Block3Intro": "The values in the text box change when you change the cascading selection option by binding the <code>Value</code> property with the <code>Select</code> component.",
+    "Block3Desc": "You can use <code>IsClearable</code> to control whether to display the clear button. The default value is <code>false</code>",
     "Block4Title": "Client validation",
     "Block4Intro": "When cascading selection is not selected, click the submit button to block.",
     "Block5Title": "The binding generic is the Guid structure",

src/BootstrapBlazor.Server/Locales/zh-CN.json

@@ -2284,6 +2284,7 @@
     "Block2Intro": "级联选择不可用状态",
     "Block3Title": "Cascader 双向绑定",
     "Block3Intro": "通过 <code>Select</code> 组件绑定 <code>Value</code> 属性，改变级联选择选项时，文本框内的数值随之改变。",
+    "Block3Desc": "通过设置 <code>Clearable=\"true\"</code> 参数，使组件获得焦点或者鼠标悬浮时显示一个 <b>清除</b> 小按钮",
     "Block4Title": "Cascader 客户端验证",
     "Block4Intro": "级联选择未选择时，点击提交按钮时拦截。",
     "Block5Title": "绑定泛型为 Guid 结构",

src/BootstrapBlazor/BootstrapBlazor.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk.Razor">
 
   <PropertyGroup>
-    <Version>9.2.7-beta02</Version>
+    <Version>9.2.7-beta03</Version>
   </PropertyGroup>
 
   <ItemGroup>

src/BootstrapBlazor/Components/Cascader/Cascader.razor

@@ -9,6 +9,10 @@
 <div @attributes="AdditionalAttributes" id="@Id" class="@ClassString" tabindex="-1">
     <input type="text" id="@InputId" readonly disabled="@Disabled" class="@InputClassName" data-bs-toggle="dropdown" placeholder="@PlaceHolder" value="@DisplayTextString" @onblur="OnBlur" />
     <span class="@AppendClassName"><i class="@Icon"></i></span>
+    @if (GetClearable())
+    {
+        <span class="@ClearClassString" @onclick="OnClearValue"><i class="@ClearIcon"></i></span>
+    }
     <div class="dropdown-menu shadow">
         <CascadingValue Value="SelectedItems">
             @foreach (var item in Items)

src/BootstrapBlazor/Components/Cascader/Cascader.razor.cs

@@ -78,6 +78,25 @@ public partial class Cascader<TValue>
     [Parameter]
     public string? SubMenuIcon { get; set; }
 
+    /// <summary>
+    /// 获得/设置 是否可清除 默认 false
+    /// </summary>
+    [Parameter]
+    public bool IsClearable { get; set; }
+
+    /// <summary>
+    /// 获得/设置 右侧清除图标 默认 fa-solid fa-angle-up
+    /// </summary>
+    [Parameter]
+    [NotNull]
+    public string? ClearIcon { get; set; }
+
+    /// <summary>
+    /// 获得/设置 清除文本内容 OnClear 回调方法 默认 null
+    /// </summary>
+    [Parameter]
+    public Func<Task>? OnClearAsync { get; set; }
+
     /// <summary>
     /// 获得/设置 失去焦点回调方法 默认 null
     /// </summary>
@@ -98,6 +117,12 @@ public partial class Cascader<TValue>
         .AddClass(SubMenuIcon, !string.IsNullOrEmpty(SubMenuIcon))
         .Build();
 
+    private string? ClearClassString => CssBuilder.Default("clear-icon")
+        .AddClass($"text-{Color.ToDescriptionString()}", Color != Color.None)
+        .AddClass($"text-success", IsValid.HasValue && IsValid.Value)
+        .AddClass($"text-danger", IsValid.HasValue && !IsValid.Value)
+        .Build();
+
     /// <summary>
     /// OnParametersSet 方法
     /// </summary>
@@ -107,6 +132,7 @@ protected override void OnParametersSet()
 
         Icon ??= IconTheme.GetIconByKey(ComponentIcons.CascaderIcon);
         SubMenuIcon ??= IconTheme.GetIconByKey(ComponentIcons.CascaderSubMenuIcon);
+        ClearIcon ??= IconTheme.GetIconByKey(ComponentIcons.SelectClearIcon);
 
         Items ??= [];
 
@@ -178,6 +204,7 @@ private void SetDefaultValue(string defaultValue)
 
     private string? ClassString => CssBuilder.Default("select cascade menu dropdown")
         .AddClass("disabled", IsDisabled)
+        .AddClass("cls", IsClearable)
         .AddClass(CssClass).AddClass(ValidCss)
         .Build();
 
@@ -196,6 +223,8 @@ private void SetDefaultValue(string defaultValue)
         .AddClass($"text-{Color.ToDescriptionString()}", Color != Color.None && !IsDisabled)
         .Build();
 
+    private bool GetClearable() => IsClearable && !IsDisabled;
+
     /// <summary>
     /// 选择项是否 Active 方法
     /// </summary>
@@ -252,4 +281,14 @@ private static void SetSelectedNodeWithParent(CascaderItem? item, List<CascaderI
             list.Add(item);
         }
     }
+
+    private async Task OnClearValue()
+    {
+        if (OnClearAsync != null)
+        {
+            await OnClearAsync();
+        }
+
+        CurrentValue = default;
+    }
 }

src/BootstrapBlazor/Components/Select/Select.razor.scss

@@ -165,7 +165,7 @@
         display: flex;
     }
 
-    &.cls:hover .form-select-append {
+    &.cls:not(.disabled):hover .form-select-append {
         display: none;
     }
 }

src/BootstrapBlazor/Components/Select/SelectObject.razor.cs

@@ -207,7 +207,7 @@ private async Task OnClearValue()
             await OnClearAsync();
         }
 
-        Value = default;
+        CurrentValue = default;
         await CloseAsync();
     }
 }

test/UnitTest/Components/CascaderTest.cs

@@ -8,19 +8,68 @@ namespace UnitTest.Components;
 public class CascaderTest : BootstrapBlazorTestBase
 {
     [Fact]
-    public void ValidateForm_OK()
+    public async Task ValidateForm_OK()
     {
-        var foo = new Foo();
+        var foo = new Foo() { Name = "test1" };
+        var valid = false;
+        var invalid = false;
+        var items = new List<CascaderItem>()
+        {
+            new() { Text = "Test1", Value = "test1" },
+            new() { Text = "Test2", Value = "test2" }
+        };
         var cut = Context.RenderComponent<ValidateForm>(pb =>
         {
+            pb.Add(a => a.OnValidSubmit, context =>
+            {
+                valid = true;
+                return Task.CompletedTask;
+            });
+            pb.Add(a => a.OnInvalidSubmit, context =>
+            {
+                invalid = true;
+                return Task.CompletedTask;
+            });
             pb.Add(a => a.Model, foo);
             pb.AddChildContent<Cascader<string>>(pb =>
             {
+                pb.Add(a => a.Items, items);
                 pb.Add(a => a.DisplayText, "Test_DisplayText");
                 pb.Add(a => a.ShowLabel, true);
+                pb.Add(a => a.IsClearable, true);
+                pb.Add(a => a.Value, foo.Name);
+                pb.Add(a => a.ValueExpression, Utility.GenerateValueExpression(foo, "Name", typeof(string)));
+                pb.Add(a => a.OnValueChanged, v =>
+                {
+                    foo.Name = v;
+                    return Task.CompletedTask;
+                });
             });
         });
         cut.Contains("Test_DisplayText");
+
+        await cut.InvokeAsync(() =>
+        {
+            var form = cut.Find("form");
+            form.Submit();
+        });
+        Assert.True(valid);
+
+        var span = cut.Find(".clear-icon");
+        Assert.True(span.ClassList.Contains("text-success"));
+
+        foo.Name = null;
+        var cascader = cut.FindComponent<Cascader<string>>();
+        cascader.SetParametersAndRender();
+        await cut.InvokeAsync(() =>
+        {
+            var form = cut.Find("form");
+            form.Submit();
+        });
+        Assert.True(invalid);
+
+        span = cut.Find(".clear-icon");
+        Assert.True(span.ClassList.Contains("text-danger"));
     }
 
     [Fact]
@@ -29,8 +78,12 @@ public void Color_Ok()
         var cut = Context.RenderComponent<Cascader<string>>(pb =>
         {
             pb.Add(a => a.Color, Color.Success);
+            pb.Add(a => a.IsClearable, true);
         });
         cut.Contains("border-success");
+
+        var span = cut.Find(".clear-icon");
+        Assert.True(span.ClassList.Contains("text-success"));
     }
 
     [Fact]
@@ -129,12 +182,32 @@ public void IsDisabled_Ok()
         var cut = Context.RenderComponent<Cascader<string>>(pb =>
         {
             pb.Add(a => a.IsDisabled, true);
+            pb.Add(a => a.IsClearable, true);
         });
 
         var input = cut.Find(".dropdown > input");
         Assert.True(input.HasAttribute("disabled"));
     }
 
+    [Fact]
+    public async Task IsClearable_Ok()
+    {
+        var isClear = false;
+        var cut = Context.RenderComponent<Cascader<string>>(pb =>
+        {
+            pb.Add(a => a.IsClearable, true);
+            pb.Add(a => a.OnClearAsync, () =>
+            {
+                isClear = true;
+                return Task.CompletedTask;
+            });
+        });
+
+        var clearButton = cut.Find(".clear-icon");
+        await cut.InvokeAsync(() => clearButton.Click());
+        Assert.True(isClear);
+    }
+
     [Fact]
     public void SubCascader_NullItems()
     {