From a4863beb4f4fadb7cbacdf856c095fb920cb9141 Mon Sep 17 00:00:00 2001
From: Mohammad Aminsafaei <m.aminsafaei@outlook.com>
Date: Wed, 4 Dec 2024 11:54:51 +0330
Subject: [PATCH] feat(blazorui): add InitialSelectedItems parameter to
 BitDorpdown #9364 (#9381)

---
 .../Inputs/Dropdown/BitDropdown.razor.cs      | 30 +++++++++++++++++--
 .../Inputs/Dropdown/BitDropdownDemo.razor.cs  |  7 +++++
 2 files changed, 35 insertions(+), 2 deletions(-)

diff --git a/src/BlazorUI/Bit.BlazorUI/Components/Inputs/Dropdown/BitDropdown.razor.cs b/src/BlazorUI/Bit.BlazorUI/Components/Inputs/Dropdown/BitDropdown.razor.cs
index a60c48ab2a..f21c5e3b8f 100644
--- a/src/BlazorUI/Bit.BlazorUI/Components/Inputs/Dropdown/BitDropdown.razor.cs
+++ b/src/BlazorUI/Bit.BlazorUI/Components/Inputs/Dropdown/BitDropdown.razor.cs
@@ -126,6 +126,11 @@ namespace Bit.BlazorUI;
     /// </summary>
     [Parameter] public RenderFragment<TItem>? HeaderTemplate { get; set; }
 
+    /// <summary>
+    /// The initial items that will be used to set selected items when using an ItemProvider.
+    /// </summary>
+    [Parameter] public IEnumerable<TItem>? InitialSelectedItems { get; set; }
+
     /// <summary>
     /// Determines the opening state of the callout. (two-way bound)
     /// </summary>
@@ -779,14 +784,32 @@ protected override async Task OnInitializedAsync()
 
         if (MultiSelect)
         {
-            if (ValuesHasBeenSet is false && DefaultValues is not null)
+            if (ItemsProvider is not null && (InitialSelectedItems?.Any() ?? false))
+            {
+                _selectedItems.AddRange(InitialSelectedItems);
+
+                if (ValuesHasBeenSet is false)
+                {
+                    await AssignValues(_selectedItems.Select(s => GetValue(s)));
+                }
+            }
+            else if (ValuesHasBeenSet is false && DefaultValues is not null)
             {
                 await AssignValues(DefaultValues);
             }
         }
         else
         {
-            if (ValueHasBeenSet is false && DefaultValue is not null)
+            if (ItemsProvider is not null && (InitialSelectedItems?.Any() ?? false))
+            {
+                _selectedItems.Add(InitialSelectedItems.First());
+
+                if (ValueHasBeenSet is false)
+                {
+                    Value = GetValue(_selectedItems.First());
+                }
+            }
+            else if (ValueHasBeenSet is false && DefaultValue is not null)
             {
                 Value = DefaultValue;
             }
@@ -1143,6 +1166,9 @@ private async ValueTask<ItemsProviderResult<TItem>> InternalItemsProvider(ItemsP
 
         _lastShowItems = [.. providerResult.Items];
 
+        UpdateSelectedItemsFromValues();
+        await InvokeAsync(StateHasChanged);
+
         return new ItemsProviderResult<TItem>(providerResult.Items, providerResult.TotalItemCount);
     }
 
diff --git a/src/BlazorUI/Demo/Client/Bit.BlazorUI.Demo.Client.Core/Pages/Components/Inputs/Dropdown/BitDropdownDemo.razor.cs b/src/BlazorUI/Demo/Client/Bit.BlazorUI.Demo.Client.Core/Pages/Components/Inputs/Dropdown/BitDropdownDemo.razor.cs
index 96cacf31fa..1fcc769595 100644
--- a/src/BlazorUI/Demo/Client/Bit.BlazorUI.Demo.Client.Core/Pages/Components/Inputs/Dropdown/BitDropdownDemo.razor.cs
+++ b/src/BlazorUI/Demo/Client/Bit.BlazorUI.Demo.Client.Core/Pages/Components/Inputs/Dropdown/BitDropdownDemo.razor.cs
@@ -131,6 +131,13 @@ public partial class BitDropdownDemo
             Description = "The custom template for rendering the header items of the dropdown.",
         },
         new()
+        {
+            Name = "InitialSelectedItems",
+            Type = "IEnumerable<TItem>?",
+            DefaultValue = "null",
+            Description = "The initial items that will be used to set selected items when using an ItemProvider.",
+        },
+        new()
         {
             Name = "IsOpen",
             Type = "bool",