Change how pages are loaded to prevent multi-load.

Marechai/Marechai.csproj

@@ -2,7 +2,7 @@
 <Project Sdk="Microsoft.NET.Sdk.Web">
   <PropertyGroup>
     <TargetFramework>netcoreapp3.1</TargetFramework>
-    <Version>4.0.0.1611</Version>
+    <Version>4.0.0.1618</Version>
     <Company>Canary Islands Computer Museum</Company>
     <Copyright>Copyright © 2003-2020 Natalia Portillo</Copyright>
     <Product>Canary Islands Computer Museum Website</Product>

Marechai/Pages/Admin/BrowserTests.razor.cs

@@ -31,8 +31,17 @@ namespace Marechai.Pages.Admin
 {
     public partial class BrowserTests
     {
+        bool              _loaded;
         List<BrowserTest> _tests;
 
-        protected override async Task OnInitializedAsync() => _tests = await Service.GetAsync();
+        protected override async Task OnAfterRenderAsync(bool firstRender)
+        {
+            if(_loaded)
+                return;
+
+            _tests  = await Service.GetAsync();
+            _loaded = true;
+            StateHasChanged();
+        }
     }
 }

Marechai/Pages/Admin/Companies.razor.cs

@@ -35,12 +35,20 @@ namespace Marechai.Pages.Admin
     public partial class Companies
     {
         List<CompanyViewModel> _companies;
+        CompanyViewModel       _currentCompany;
+        bool                   _deleteInProgress;
+        Modal                  _frmDelete;
+        bool                   _loaded;
 
-        CompanyViewModel _currentCompany;
+        protected override async Task OnAfterRenderAsync(bool firstRender)
-        bool             _deleteInProgress;
+        {
-        Modal            _frmDelete;
+            if(_loaded)
+                return;
 
-        protected override async Task OnInitializedAsync() => _companies = await Service.GetAsync();
+            _companies = await Service.GetAsync();
+            _loaded    = true;
+            StateHasChanged();
+        }
 
         void ShowModal(int itemId)
         {

Marechai/Pages/Admin/DocumentCompanies.razor.cs

@@ -35,12 +35,20 @@ namespace Marechai.Pages.Admin
     public partial class DocumentCompanies
     {
         List<DocumentCompanyViewModel> _companies;
+        DocumentCompanyViewModel       _currentCompany;
+        bool                           _deleteInProgress;
+        Modal                          _frmDelete;
+        bool                           _loaded;
 
-        DocumentCompanyViewModel _currentCompany;
+        protected override async Task OnAfterRenderAsync(bool firstRender)
-        bool                     _deleteInProgress;
+        {
-        Modal                    _frmDelete;
+            if(_loaded)
+                return;
 
-        protected override async Task OnInitializedAsync() => _companies = await Service.GetAsync();
+            _companies = await Service.GetAsync();
+            _loaded    = true;
+            StateHasChanged();
+        }
 
         void ShowModal(int itemId)
         {

Marechai/Pages/Admin/DocumentPeople.razor.cs

@@ -36,6 +36,7 @@ namespace Marechai.Pages.Admin
     {
         bool                          _deleteInProgress;
         Modal                         _frmDelete;
+        bool                          _loaded;
         List<DocumentPersonViewModel> _people;
         DocumentPersonViewModel       _person;
 
@@ -74,6 +75,14 @@ namespace Marechai.Pages.Admin
 
         void ModalClosing(ModalClosingEventArgs obj) => _person = null;
 
-        protected override async Task OnInitializedAsync() => _people = await Service.GetAsync();
+        protected override async Task OnAfterRenderAsync(bool firstRender)
+        {
+            if(_loaded)
+                return;
+
+            _people = await Service.GetAsync();
+            _loaded = true;
+            StateHasChanged();
+        }
     }
 }

Marechai/Pages/Admin/Gpus.razor.cs

@@ -38,6 +38,7 @@ namespace Marechai.Pages.Admin
         Modal              _frmDelete;
         GpuViewModel       _gpu;
         List<GpuViewModel> _gpus;
+        bool               _loaded;
 
         void ShowModal(int itemId)
         {
@@ -74,6 +75,14 @@ namespace Marechai.Pages.Admin
 
         void ModalClosing(ModalClosingEventArgs obj) => _gpu = null;
 
-        protected override async Task OnInitializedAsync() => _gpus = await Service.GetAsync();
+        protected override async Task OnAfterRenderAsync(bool firstRender)
+        {
+            if(_loaded)
+                return;
+
+            _gpus   = await Service.GetAsync();
+            _loaded = true;
+            StateHasChanged();
+        }
     }
 }

Marechai/Pages/Admin/InstructionSetExtensions.razor.cs

@@ -38,6 +38,7 @@ namespace Marechai.Pages.Admin
         InstructionSetExtension       _extension;
         List<InstructionSetExtension> _extensions;
         Modal                         _frmDelete;
+        bool                          _loaded;
 
         void ShowModal(int itemId)
         {
@@ -74,6 +75,14 @@ namespace Marechai.Pages.Admin
 
         void ModalClosing(ModalClosingEventArgs obj) => _extension = null;
 
-        protected override async Task OnInitializedAsync() => _extensions = await Service.GetAsync();
+        protected override async Task OnAfterRenderAsync(bool firstRender)
+        {
+            if(_loaded)
+                return;
+
+            _extensions = await Service.GetAsync();
+            _loaded     = true;
+            StateHasChanged();
+        }
     }
 }

Marechai/Pages/Admin/InstructionSets.razor.cs

@@ -38,6 +38,7 @@ namespace Marechai.Pages.Admin
         Modal                _frmDelete;
         InstructionSet       _instructionSet;
         List<InstructionSet> _instructionSets;
+        bool                 _loaded;
 
         void ShowModal(int itemId)
         {
@@ -74,6 +75,14 @@ namespace Marechai.Pages.Admin
 
         void ModalClosing(ModalClosingEventArgs obj) => _instructionSet = null;
 
-        protected override async Task OnInitializedAsync() => _instructionSets = await Service.GetAsync();
+        protected override async Task OnAfterRenderAsync(bool firstRender)
+        {
+            if(_loaded)
+                return;
+
+            _instructionSets = await Service.GetAsync();
+            _loaded          = true;
+            StateHasChanged();
+        }
     }
 }

Marechai/Pages/Admin/Licenses.razor.cs

@@ -38,6 +38,7 @@ namespace Marechai.Pages.Admin
         Modal         _frmDelete;
         License       _license;
         List<License> _licenses;
+        bool          _loaded;
 
         void ShowModal(int itemId)
         {
@@ -74,6 +75,14 @@ namespace Marechai.Pages.Admin
 
         void ModalClosing(ModalClosingEventArgs obj) => _license = null;
 
-        protected override async Task OnInitializedAsync() => _licenses = await Service.GetAsync();
+        protected override async Task OnAfterRenderAsync(bool firstRender)
+        {
+            if(_loaded)
+                return;
+
+            _licenses = await Service.GetAsync();
+            _loaded   = true;
+            StateHasChanged();
+        }
     }
 }

Marechai/Pages/Admin/MachineFamilies.razor.cs

@@ -36,6 +36,7 @@ namespace Marechai.Pages.Admin
     {
         bool                         _deleteInProgress;
         Modal                        _frmDelete;
+        bool                         _loaded;
         List<MachineFamilyViewModel> _machineFamilies;
         MachineFamilyViewModel       _machineFamily;
 
@@ -74,6 +75,14 @@ namespace Marechai.Pages.Admin
 
         void ModalClosing(ModalClosingEventArgs obj) => _machineFamily = null;
 
-        protected override async Task OnInitializedAsync() => _machineFamilies = await Service.GetAsync();
+        protected override async Task OnAfterRenderAsync(bool firstRender)
+        {
+            if(_loaded)
+                return;
+
+            _machineFamilies = await Service.GetAsync();
+            _loaded          = true;
+            StateHasChanged();
+        }
     }
 }

Marechai/Pages/Admin/Machines.razor.cs

@@ -36,6 +36,7 @@ namespace Marechai.Pages.Admin
     {
         bool                   _deleteInProgress;
         Modal                  _frmDelete;
+        bool                   _loaded;
         MachineViewModel       _machine;
         List<MachineViewModel> _machines;
 
@@ -74,6 +75,14 @@ namespace Marechai.Pages.Admin
 
         void ModalClosing(ModalClosingEventArgs obj) => _machine = null;
 
-        protected override async Task OnInitializedAsync() => _machines = await Service.GetAsync();
+        protected override async Task OnAfterRenderAsync(bool firstRender)
+        {
+            if(_loaded)
+                return;
+
+            _machines = await Service.GetAsync();
+            _loaded   = true;
+            StateHasChanged();
+        }
     }
 }

Marechai/Pages/Admin/News.razor.cs

@@ -37,9 +37,18 @@ namespace Marechai.Pages.Admin
         NewsViewModel       _currentNews;
         bool                _deleteInProgress;
         Modal               _frmDelete;
+        bool                _loaded;
         List<NewsViewModel> _news;
 
-        protected override async Task OnInitializedAsync() => _news = await Service.GetAsync();
+        protected override async Task OnAfterRenderAsync(bool firstRender)
+        {
+            if(_loaded)
+                return;
+
+            _news   = await Service.GetAsync();
+            _loaded = true;
+            StateHasChanged();
+        }
 
         void ShowModal(int itemId)
         {

Marechai/Pages/Admin/People.razor.cs

@@ -36,6 +36,7 @@ namespace Marechai.Pages.Admin
     {
         bool                  _deleteInProgress;
         Modal                 _frmDelete;
+        bool                  _loaded;
         List<PersonViewModel> _people;
         PersonViewModel       _person;
 
@@ -74,6 +75,14 @@ namespace Marechai.Pages.Admin
 
         void ModalClosing(ModalClosingEventArgs obj) => _person = null;
 
-        protected override async Task OnInitializedAsync() => _people = await Service.GetAsync();
+        protected override async Task OnAfterRenderAsync(bool firstRender)
+        {
+            if(_loaded)
+                return;
+
+            _people = await Service.GetAsync();
+            _loaded = true;
+            StateHasChanged();
+        }
     }
 }

Marechai/Pages/Admin/Processors.razor.cs

@@ -36,6 +36,7 @@ namespace Marechai.Pages.Admin
     {
         bool                     _deleteInProgress;
         Modal                    _frmDelete;
+        bool                     _loaded;
         ProcessorViewModel       _processor;
         List<ProcessorViewModel> _processors;
 
@@ -74,6 +75,14 @@ namespace Marechai.Pages.Admin
 
         void ModalClosing(ModalClosingEventArgs obj) => _processor = null;
 
-        protected override async Task OnInitializedAsync() => _processors = await Service.GetAsync();
+        protected override async Task OnAfterRenderAsync(bool firstRender)
+        {
+            if(_loaded)
+                return;
+
+            _processors = await Service.GetAsync();
+            _loaded     = true;
+            StateHasChanged();
+        }
     }
 }

Marechai/Pages/Admin/Resolutions.razor.cs

@@ -36,6 +36,7 @@ namespace Marechai.Pages.Admin
     {
         bool                      _deleteInProgress;
         Modal                     _frmDelete;
+        bool                      _loaded;
         ResolutionViewModel       _resolution;
         List<ResolutionViewModel> _resolutions;
 
@@ -74,6 +75,14 @@ namespace Marechai.Pages.Admin
 
         void ModalClosing(ModalClosingEventArgs obj) => _resolution = null;
 
-        protected override async Task OnInitializedAsync() => _resolutions = await Service.GetAsync();
+        protected override async Task OnAfterRenderAsync(bool firstRender)
+        {
+            if(_loaded)
+                return;
+
+            _resolutions = await Service.GetAsync();
+            _loaded      = true;
+            StateHasChanged();
+        }
     }
 }

Marechai/Pages/Admin/Screens.razor.cs

@@ -36,6 +36,7 @@ namespace Marechai.Pages.Admin
     {
         bool                  _deleteInProgress;
         Modal                 _frmDelete;
+        bool                  _loaded;
         ScreenViewModel       _screen;
         List<ScreenViewModel> _screens;
 
@@ -74,6 +75,14 @@ namespace Marechai.Pages.Admin
 
         void ModalClosing(ModalClosingEventArgs obj) => _screen = null;
 
-        protected override async Task OnInitializedAsync() => _screens = await Service.GetAsync();
+        protected override async Task OnAfterRenderAsync(bool firstRender)
+        {
+            if(_loaded)
+                return;
+
+            _screens = await Service.GetAsync();
+            _loaded  = true;
+            StateHasChanged();
+        }
     }
 }

Marechai/Pages/Admin/SoundSynths.razor.cs

@@ -36,6 +36,7 @@ namespace Marechai.Pages.Admin
     {
         bool                      _deleteInProgress;
         Modal                     _frmDelete;
+        bool                      _loaded;
         SoundSynthViewModel       _soundSynth;
         List<SoundSynthViewModel> _soundSynths;
 
@@ -74,6 +75,14 @@ namespace Marechai.Pages.Admin
 
         void ModalClosing(ModalClosingEventArgs obj) => _soundSynth = null;
 
-        protected override async Task OnInitializedAsync() => _soundSynths = await Service.GetAsync();
+        protected override async Task OnAfterRenderAsync(bool firstRender)
+        {
+            if(_loaded)
+                return;
+
+            _soundSynths = await Service.GetAsync();
+            _loaded      = true;
+            StateHasChanged();
+        }
     }
 }

Marechai/Pages/Companies/Index.razor.cs

@@ -32,18 +32,21 @@ namespace Marechai.Pages.Companies
 {
     public partial class Index
     {
-        char? _character;
+        char?                  _character;
-
         List<CompanyViewModel> _companies;
         string                 _countryName;
+        bool                   _loaded;
         [Parameter]
         public int? CountryId { get; set; }
 
         [Parameter]
         public string StartingCharacter { get; set; }
 
-        protected override async Task OnInitializedAsync()
+        protected override async Task OnAfterRenderAsync(bool firstRender)
         {
+            if(_loaded)
+                return;
+
             _character = null;
 
             if(!string.IsNullOrWhiteSpace(StartingCharacter) &&
@@ -80,6 +83,8 @@ namespace Marechai.Pages.Companies
             }
 
             _companies ??= await Service.GetAsync();
+            _loaded    =   true;
+            StateHasChanged();
         }
     }
 }

Marechai/Pages/Companies/View.razor.cs

@@ -49,8 +49,11 @@ namespace Marechai.Pages.Companies
         public bool ComputersCollapsed { get; set; } = true;
         public bool ConsolesCollapsed  { get; set; } = true;
 
-        protected override async Task OnInitializedAsync()
+        protected override async Task OnAfterRenderAsync(bool firstRender)
         {
+            if(_loaded)
+                return;
+
             if(Id <= 0)
             {
                 _loaded = true;
@@ -69,6 +72,7 @@ namespace Marechai.Pages.Companies
             _logos       = await CompanyLogosService.GetByCompany(Id);
 
             _loaded = true;
+            StateHasChanged();
         }
 
         void CollapseComputers()

Marechai/Pages/Computers/Index.razor

@@ -31,7 +31,9 @@
 
 @if (!_loaded)
 {
-    @L["Loading..."]
+    <p align="center">@L["Loading..."]</p>
+
+    return;
 }
 
 <p>

Marechai/Pages/Computers/Index.razor.cs

@@ -34,13 +34,17 @@ namespace Marechai.Pages.Computers
         int  _maxYear;
         int  _minYear;
 
-        protected override async Task OnInitializedAsync()
+        protected override async Task OnAfterRenderAsync(bool firstRender)
         {
+            if(_loaded)
+                return;
+
             _computers = await Service.GetComputersCountAsync();
             _minYear   = await Service.GetMinimumYearAsync();
             _maxYear   = await Service.GetMaximumYearAsync();
 
             _loaded = true;
+            StateHasChanged();
         }
     }
 }

Marechai/Pages/Computers/Search.razor

@@ -33,7 +33,9 @@
 
 @if (_computers is null)
 {
-    @L["Loading..."]
+    <p align="center">@L["Loading..."]</p>
+
+    return;
 }
 
 <p>@L["Search results:"]</p>

Marechai/Pages/Computers/Search.razor.cs

@@ -32,17 +32,20 @@ namespace Marechai.Pages.Computers
 {
     public partial class Search
     {
-        char? _character;
+        char?                  _character;
-
         List<MachineViewModel> _computers;
+        bool                   _loaded;
         [Parameter]
         public int? Year { get; set; }
 
         [Parameter]
         public string StartingCharacter { get; set; }
 
-        protected override async Task OnInitializedAsync()
+        protected override async Task OnAfterRenderAsync(bool firstRender)
         {
+            if(_loaded)
+                return;
+
             _character = null;
 
             if(!string.IsNullOrWhiteSpace(StartingCharacter) &&
@@ -70,6 +73,8 @@ namespace Marechai.Pages.Computers
                 _computers = await Service.GetComputersByYearAsync(Year.Value);
 
             _computers ??= await Service.GetComputersAsync();
+            _loaded    =   true;
+            StateHasChanged();
         }
     }
 }

Marechai/Pages/Consoles/Index.razor

@@ -31,7 +31,9 @@
 
 @if (!_loaded)
 {
-    @L["Loading..."]
+    <p align="center">@L["Loading..."]</p>
+
+    return;
 }
 
 <p>

Marechai/Pages/Consoles/Index.razor.cs

@@ -34,13 +34,17 @@ namespace Marechai.Pages.Consoles
         int  _maxYear;
         int  _minYear;
 
-        protected override async Task OnInitializedAsync()
+        protected override async Task OnAfterRenderAsync(bool firstRender)
         {
+            if(_loaded)
+                return;
+
             _consoles = await Service.GetConsolesCountAsync();
             _minYear  = await Service.GetMinimumYearAsync();
             _maxYear  = await Service.GetMaximumYearAsync();
 
             _loaded = true;
+            StateHasChanged();
         }
     }
 }

Marechai/Pages/Consoles/Search.razor

@@ -33,7 +33,9 @@
 
 @if (_consoles is null)
 {
-    @L["Loading..."]
+    <p align="center">@L["Loading..."]</p>
+
+    return;
 }
 
 <p>@L["Search results:"]</p>

Marechai/Pages/Consoles/Search.razor.cs

@@ -32,17 +32,20 @@ namespace Marechai.Pages.Consoles
 {
     public partial class Search
     {
-        char? _character;
+        char?                  _character;
-
         List<MachineViewModel> _consoles;
+        bool                   _loaded;
         [Parameter]
         public int? Year { get; set; }
 
         [Parameter]
         public string StartingCharacter { get; set; }
 
-        protected override async Task OnInitializedAsync()
+        protected override async Task OnAfterRenderAsync(bool firstRender)
         {
+            if(_loaded)
+                return;
+
             _character = null;
 
             if(!string.IsNullOrWhiteSpace(StartingCharacter) &&
@@ -70,6 +73,8 @@ namespace Marechai.Pages.Consoles
                 _consoles = await Service.GetConsolesByYearAsync(Year.Value);
 
             _consoles ??= await Service.GetConsolesAsync();
+            _loaded   =   true;
+            StateHasChanged();
         }
     }
 }

Marechai/Pages/Home/Index.razor

@@ -29,6 +29,14 @@
 @inject IStringLocalizer<NewsService> L
 
 <h2>@L["News"]</h2>
+
+@if (!_loaded)
+{
+    <p align="center">@L["Loading..."]</p>
+
+    return;
+}
+
 @foreach (var news in _news)
 {
     <table border="0" width="100%">

Marechai/Pages/Home/Index.razor.cs

@@ -30,8 +30,17 @@ namespace Marechai.Pages.Home
 {
     public partial class Index
     {
+        bool                _loaded;
         List<NewsViewModel> _news;
 
-        protected override void OnInitialized() => _news = Service.GetNews();
+        protected override void OnAfterRender(bool firstRender)
+        {
+            if(_loaded)
+                return;
+
+            _news   = Service.GetNews();
+            _loaded = true;
+            StateHasChanged();
+        }
     }
 }

Marechai/Pages/Machines/View.razor.cs

@@ -42,8 +42,11 @@ namespace Marechai.Pages.Machines
         [Parameter]
         public int Id { get; set; }
 
-        protected override async Task OnInitializedAsync()
+        protected override async Task OnAfterRenderAsync(bool firstRender)
         {
+            if(_loaded)
+                return;
+
             _machine = await Service.GetMachine(Id);
 
             _processorVisible = new bool[_machine.Processors.Count];
@@ -52,6 +55,7 @@ namespace Marechai.Pages.Machines
             _photos           = await MachinePhotosService.GetGuidsByMachineAsync(Id);
 
             _loaded = true;
+            StateHasChanged();
         }
     }
 }