Able to download whole data to local

LearningChineseFixed/LearningChineseFixed.csproj

@@ -12,6 +12,7 @@
     <PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly" Version="6.0.19" />
     <PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly.DevServer" Version="6.0.19" PrivateAssets="all" />
     <PackageReference Include="MudBlazor" Version="6.5.0" />
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
   </ItemGroup>
 
   <ItemGroup>

LearningChineseFixed/Pages/Index.razor

@@ -21,7 +21,7 @@
         <MudContainer Class="justify-center d-flex">
             @if (Charecters != null)
             {
-                <MudPaper Class="overflow-scroll rounded-0" Style="height: 60vh;" Elevation="1">
+                <MudPaper Class="overflow-scroll rounded-0" Style="height: 50vh;" Elevation="1">
                     <MudDataGrid FixedHeader=true Items="@Charecters">
                         <Columns>
                             <PropertyColumn Property="x => x.charcter" Title="CChar" />
@@ -31,15 +31,47 @@
                 </MudPaper>
             }
         </MudContainer>
+
+        <MudContainer Class="justify-center d-flex pt-4">
+            <MudButton Class="mt-1 mb-7" Variant="Variant.Filled" Color="Color.Secondary" Disabled="@(isLoading || isSavedLocally)" OnClick="LoadAllChunksIntoLocalStorage">
+                @if (!isSavedLocally)
+                {
+                    @if (isLoading)
+                    {
+                        <MudText>@($"{savedChunks}/{numOfChunks}")</MudText>
+                        <MudProgressCircular Class="pl-8 ms-n1 mr-2" Size="Size.Small" Indeterminate="true" />
+                    }
+                    else
+                    {
+                        <MudText>Load chunks to local storage</MudText>
+                        <MudIcon Icon="@Icons.Material.Rounded.Send" Class="mr-1" />
+                    }
+                }
+                else
+                {
+                    <MudText>Chunks are saved locally</MudText>
+                }
+            </MudButton>
+        </MudContainer>
+        <MudContainer Class="justify-center d-flex pt-4">
+            <MudButton OnClick="async ()=>{await localStorage.ClearAsync(); navigator.NavigateTo(string.Empty, true);}" Variant="Variant.Outlined" Color="Color.Tertiary">Delete local storage</MudButton>
+        </MudContainer>
     </MudContainer>
 </MudContainer>
 
 @code{
     int numOfChunks = 197; //Exclusive index 0
     int selectedChunk = 0;
+    int savedChunks = 0;
 
-    protected override void OnInitialized()
+    bool isLoading = false;
+    bool isSavedLocally = false;
+
+    protected async override Task OnInitializedAsync()
     {
+        if (await localStorage.ContainKeyAsync("Normalized_chunk_001.json")) 
+            isSavedLocally = true;
+
         SelectedChunk();
         StateHasChanged();
     }
@@ -53,7 +85,34 @@
     CChar[]? Charecters;
     async void SelectedChunk()
     {
-        Charecters = await httpClient.GetFromJsonAsync<CChar[]>($"Data/Normalized_chunk_{selectedChunk.ToString("000")}.json");
+        if (await localStorage.ContainKeyAsync("Normalized_chunk_001.json"))
+            isSavedLocally = true;
+
+        if (!isSavedLocally)
+            Charecters = await httpClient.GetFromJsonAsync<CChar[]>($"Data/Normalized_chunk_{selectedChunk.ToString("000")}.json");
+        else
+        {
+            string json = await localStorage.GetItemAsync<string>($"Normalized_chunk_{selectedChunk.ToString("000")}.json");
+            Charecters = JsonConvert.DeserializeObject<CChar[]>(json);
+        }
+        StateHasChanged();
+    }
+
+    async void LoadAllChunksIntoLocalStorage()
+    {
+        isLoading = true;
+        for (int i = 0; i < numOfChunks; i++)
+        {
+            string? jsonChunk = await httpClient.GetStringAsync($"Data/Normalized_chunk_{i.ToString("000")}.json");
+
+            if (string.IsNullOrEmpty(jsonChunk)) continue;
+
+            await localStorage.SetItemAsync($"Normalized_chunk_{i.ToString("000")}.json", jsonChunk);
+            savedChunks = i + 1;
+            StateHasChanged();
+        }
+        isLoading = false;
+        isSavedLocally = true;
         StateHasChanged();
     }
 }

LearningChineseFixed/Pages/Learn.razor

@@ -76,6 +76,8 @@
 @code {
     public bool ShowOverlay = false;
 
+    bool isSavedLocally = false;
+
     public Answer[] Answers = new Answer[4];
     public void SelectButton(int selectedIndex)
     {
@@ -109,10 +111,17 @@
     {
         Program.UpdateUiEvent += OnUiUpdate;
 
+        isSavedLocally = await localStorage.ContainKeyAsync("Normalized_chunk_001.json");
+
         int selectedChunk = await localStorage.GetItemAsync<int>("SelectedChunk");
 
-        //Charecters = await httpClient.GetFromJsonAsync<CChar[]>("Data/NormalizedDataset.json");
+        if (!isSavedLocally)
-        Charecters = await httpClient.GetFromJsonAsync<CChar[]>($"Data/Normalized_chunk_{selectedChunk.ToString("000")}.json");
+            Charecters = await httpClient.GetFromJsonAsync<CChar[]>($"Data/Normalized_chunk_{selectedChunk.ToString("000")}.json");
+        else
+        {
+            string json = await localStorage.GetItemAsync<string>($"Normalized_chunk_{selectedChunk.ToString("000")}.json");
+            Charecters = JsonConvert.DeserializeObject<CChar[]>(json);
+        }
 
         DontSkipTheseCChar = Charecters.ToList();
         Program.CCharsLeft = DontSkipTheseCChar.Count;

LearningChineseFixed/Shared/MainLayout.razor

@@ -7,7 +7,8 @@
     <MudAppBar Elevation="0">
         @if (Program.CCharsLeft > 0)
         {
-            <MudText>@("CChars left: " + Program.CCharsLeft)</MudText>
+            <MudButton OnClick="()=>navigator.NavigateTo(string.Empty)" Variant="Variant.Outlined" Color="Color.Primary">Back</MudButton>
+            <MudText Class="pl-8">@("CChars left: " + Program.CCharsLeft)</MudText>
         }
         <MudSpacer />
         <MudIconButton Icon="@Icons.Custom.Brands.MudBlazor" Color="Color.Inherit" Link="https://mudblazor.com/" Target="_blank" />

LearningChineseFixed/_Imports.razor

@@ -10,3 +10,4 @@
 @using LearningChineseFixed.Shared
 @using MudBlazor
 @using Blazored.LocalStorage
+@using Newtonsoft.Json