doc: 增加 Clear 处理逻辑

Author: ArgoZhang

src/BootstrapBlazor.Server/Components/Pages/Coms.razor

@@ -4,7 +4,8 @@
 <div class="coms-search">
     <div class="row">
         <div class="col-12">
-            <Search @bind-Value="@SearchText" PlaceHolder="@Localizer["Search"]" OnSearch="@OnSearch" ShowClearButton="true"></Search>
+            <Search @bind-Value="@SearchText" PlaceHolder="@Localizer["Search"]"
+                    OnSearch="@OnSearch" OnClear="OnClear" ShowClearButton="true"></Search>
         </div>
     </div>
     <div class="coms-search-filter">

src/BootstrapBlazor.Server/Components/Pages/Coms.razor.cs

@@ -19,4 +19,11 @@ public sealed partial class Coms
         SearchText = searchText;
         return Task.FromResult<IEnumerable<string?>>(ComponentItems.Where(i => i.Contains(searchText, StringComparison.OrdinalIgnoreCase)).ToList());
     }
+
+    private Task OnClear(string searchText)
+    {
+        SearchText = "";
+        StateHasChanged();
+        return Task.CompletedTask;
+    }
 }