CSS Not Working In _Host.chstml In Blazor Server

Question

Here I have blazor server app, in app I have two _Host.cshtml, one for website which is default _Host.cshtml and another for admin panel that is _HostAdmin.cshtml. Both of them have separate css and js file. I too have separate layout, for website I have Mainlayout.razor which should use _Host.cshtml and for admin panel I have AdminLayout.razor which should use _HostAdmin.cshtml .

Now, the problem is that when I add new razor component and use AdminLayout.razor layout the view doesnot use css and js of _HostAdmin.cshtml.

Below is my _HostAdmin.cshtml

@page "/Admin"
@namespace MCQ.Pages._Pages_Admin__HostAdmin
@addTagHelper *, Microsoft.AspNetCore.Mvc.TagHelpers
@{
    Layout = null;
}

<!DOCTYPE html>
<html>
  <head>
     <meta charset="utf-8">
     <meta http-equiv="X-UA-Compatible" content="IE=edge">
     <title>Admin Dashboard</title>
     <meta name="viewport" content="width=device-width, initial-scale=1">

     <base href="~/Admin" />

     <link rel="stylesheet" href="/Adminlte/plugins/fontawesome-free/css/all.min.css" />
     <link rel="stylesheet" href="/Adminlte/plugins/fontawesome-free/css/all.min.css">
     <link rel="stylesheet" href="https://code.ionicframework.com/ionicons/2.0.1/css/ionicons.min.css">
     <link rel="stylesheet" href="/Adminlte/plugins/tempusdominus-bootstrap-4/css/tempusdominus-bootstrap-4.min.css">
     <link rel="stylesheet" href="/Adminlte/plugins/icheck-bootstrap/icheck-bootstrap.min.css">
     <link rel="stylesheet" href="/Adminlte/plugins/jqvmap/jqvmap.min.css">
     <link rel="stylesheet" href="/Adminlte/dist/css/adminlte.min.css">
     <link rel="stylesheet" href="/Adminlte/plugins/overlayScrollbars/css/OverlayScrollbars.min.css">
     <link rel="stylesheet" href="/Adminlte/plugins/daterangepicker/daterangepicker.css">
     <link rel="stylesheet" href="/Adminlte/plugins/summernote/summernote-bs4.css">
     <link href="https://fonts.googleapis.com/css?family=Source+Sans+Pro:300,400,400i,700" rel="stylesheet">

</head>
  <body class="hold-transition sidebar-mini layout-fixed">

    <div class="wrapper">
       <component type="typeof(App)" render-mode="ServerPrerendered" />
    </div>

    <script src="~/Adminlte/plugins/jquery/jquery.min.js"></script>
    <script src="~/Adminlte/plugins/jquery-ui/jquery-ui.min.js"></script>
    <script>$.widget.bridge('uibutton', $.ui.button)</script>
    <script src="~/Adminlte/plugins/bootstrap/js/bootstrap.bundle.min.js"></script>
    <script src="~/Adminlte/plugins/chart.js/Chart.min.js"></script>
    <script src="~/Adminlte/plugins/sparklines/sparkline.js"></script>
    <script src="~/Adminlte/plugins/jqvmap/jquery.vmap.min.js"></script>
    <script src="~/Adminlte/plugins/jqvmap/maps/jquery.vmap.usa.js"></script>
    <script src="~/Adminlte/plugins/jquery-knob/jquery.knob.min.js"></script>
    <script src="~/Adminlte/plugins/moment/moment.min.js"></script>
    <script src="~/Adminlte/plugins/daterangepicker/daterangepicker.js"></script>
    <script src="~/Adminlte/plugins/tempusdominus-bootstrap-4/js/tempusdominus-bootstrap-4.min.js"></script>
    <script src="~/Adminlte/plugins/summernote/summernote-bs4.min.js"></script>
    <script src="~/Adminlte/plugins/overlayScrollbars/js/jquery.overlayScrollbars.min.js"></script>
    <script src="~/Adminlte/dist/js/adminlte.js"></script>
    <script src="~/Adminlte/dist/js/pages/dashboard.js"></script>
    <script src="~/Adminlte/dist/js/demo.js"></script>
 </body>
</html>

Below is Startup.cs

  app.UseEndpoints(endpoints =>
        {
            endpoints.MapControllers();
            endpoints.MapBlazorHub();
            endpoints.MapFallbackToPage("/_Host");
            endpoints.MapFallbackToPage("~/Admin/{*clientroutes:nonfile}", "/_HostAdmin");
        });

@HenkHolterman : I changed my endpoint to endpoints.MapFallbackToPage("/Admin/{**segment}", "/Admin/_HostAdmin"); but it did not work — sudip chand
– sudip chand, Commented May 2, 2021 at 7:54
VS doesn't automatically run As Admin. If running in VS right click VS shortcut and select Run As Adim. The application will also run by just running the executable from outside VS. — jdweng
– jdweng, Commented May 2, 2021 at 9:49

MrC aka Shaun Curtis · Accepted Answer · 2021-05-02 21:21:18Z

3

You state

Now, the problem is that when I add new razor component and use AdminLayout.razor layout the view doesnot use css and js of _HostAdmin.cshtml.

and I assume your question is "Why".

You're adding a new razor component page to the existing application - probably with a route of something like "/admin/myadminpage". You're misunderstanding what's actually going on.

_Host.cshtml loads the SPA, but that's the only get/post that happens. Navigation after that is changing out components in the DOM. Loading a component with the layout AdminLayout just changes out the Layout component. There's no toing and froing with the server.

What you are trying to do requires a reload of the SPA. You could use:

NavigationManager.NavigateTo("/admin/myadminpage", true);

Also even if you do force a reload, the Fallbacks are in the wrong order - the default before the specific.

    endpoints.MapFallbackToPage("/_Host");
    endpoints.MapFallbackToPage("~/Admin/{*clientroutes:nonfile}", "/_HostAdmin");

answered May 2, 2021 at 21:21

MrC aka Shaun Curtis

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1 Comment

sudip chand Over a year ago

thank you, it worked what is the correct order of fallback

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