Blazor Web Assembly Collapsible Nav Menu with Sub Menus and JS fix positioning when page width is altered.

Blazor_WebAssembly/Blazor_WebAssembly.Client/Layout/MainLayout.razor

@@ -1,13 +1,13 @@
 @inherits LayoutComponentBase
 
 <div class="page">
-    <div class="sidebar">
-        <NavMenu />
+    <div class="sidebar" style="@IconMenuCssClass">
+        <NavMenu ShowIconMenu="ToggleIconMenu" />
     </div>
 
     <main>
         <div class="top-row px-4">
-            <a href="https://learn.microsoft.com/aspnet/core/" target="_blank">About</a>
+            <a href="https://docs.microsoft.com/aspnet/" target="_blank">About</a>
         </div>
 
         <article class="content px-4">
@@ -16,8 +16,13 @@
     </main>
 </div>
 
-<div id="blazor-error-ui">
-    An unhandled error has occurred.
-    <a href="" class="reload">Reload</a>
-    <a class="dismiss">🗙</a>
-</div>
+@code
+{
+    private bool IconMenuActive { get; set; } = false;
+    private string? IconMenuCssClass => IconMenuActive ? "width: 80px;" : null;
+
+    protected void ToggleIconMenu(bool iconMenuActive)
+    {
+        IconMenuActive = iconMenuActive;
+    }
+}

Blazor_WebAssembly/Blazor_WebAssembly.Client/Layout/NavMenu.razor

@@ -1,29 +1,184 @@
-<div class="top-row ps-3 navbar navbar-dark">
+@inject IJSRuntime JSRuntime
+
+<div class="top-row ps-3 navbar navbar-dark">
     <div class="container-fluid">
-        <a class="navbar-brand" href="">Blazor_WebAssembly</a>
+        @if (!IconMenuActive)
+        {
+            <a class="navbar-brand" href="">Blazor Server</a>
+        }
+        <button title="Navigation menu" class="navbar-toggler" @onclick="ToggleNavMenu">
+            <span class="navbar-toggler-icon"></span>
+        </button>
     </div>
 </div>
 
-<input type="checkbox" title="Navigation menu" class="navbar-toggler" />
-
-<div class="nav-scrollable" onclick="document.querySelector('.navbar-toggler').click()">
+<div class="@NavMenuCssClass">
     <nav class="flex-column">
         <div class="nav-item px-3">
             <NavLink class="nav-link" href="" Match="NavLinkMatch.All">
-                <span class="bi bi-house-door-fill-nav-menu" aria-hidden="true"></span> Home
+                <span class="bi bi-house" aria-hidden="true"></span>
+                @if (!IconMenuActive)
+                {
+                    <span><label>Home</label></span>
+                }
             </NavLink>
         </div>
-
         <div class="nav-item px-3">
             <NavLink class="nav-link" href="counter">
-                <span class="bi bi-plus-square-fill-nav-menu" aria-hidden="true"></span> Counter
+                <span class="bi bi-plus-circle" aria-hidden="true"></span>
+                @if (!IconMenuActive)
+                {
+                    <span><label>Counter</label></span>
+                }
             </NavLink>
         </div>
-
         <div class="nav-item px-3">
             <NavLink class="nav-link" href="weather">
-                <span class="bi bi-list-nested-nav-menu" aria-hidden="true"></span> Weather
+                <span class="bi bi-brightness-high" aria-hidden="true"></span>
+                @if (!IconMenuActive)
+                {
+                    <span><label>Fetch data</label></span>
+                }
             </NavLink>
         </div>
+        <div class="nav-item px-3" @onclick='@(() => ToggleSubMenu("subMenu1"))'>
+            <NavLink class="nav-link flex-container" Match="NavLinkMatch.All">
+                <span class="bi bi-folder" aria-hidden="true" title="subMenu"></span>
+                @if (!IconMenuActive)
+                {
+                    <span><label>Sub Menu 1</label></span>
+                    <span class="oi chevron-icon @(IsSubMenuOpen("subMenu1") ? "bi bi-arrow-up-short" : "bi bi-arrow-down-short")" aria-hidden="true"></span>
+                }
+            </NavLink>
+            <div class="sub-menu" style="display: @(IsSubMenuOpen("subMenu1") ? "block" : "none")">
+                <NavLink class="nav-link" href="subitem1">
+                    <span class="bi bi-arrow-right-circle" aria-hidden="true" title="Sub Item 1"></span>
+                    @if (!IconMenuActive)
+                    {
+                        <span><label>Sub Menu 1 Item 1</label></span>
+                    }
+                </NavLink>
+                <NavLink class="nav-link" href="subitem2">
+                    <span class="bi bi-arrow-right-circle" aria-hidden="true" title="Sub Item 2"></span>
+                    @if (!IconMenuActive)
+                    {
+                        <span><label>Sub Menu 1 Item 2</label></span>
+                    }
+                </NavLink>
+            </div>
+        </div>
+        <div class="nav-item px-3" @onclick='@(() => ToggleSubMenu("subMenu2"))'>
+            <NavLink class="nav-link flex-container" Match="NavLinkMatch.All">
+                <span class="bi bi-folder" aria-hidden="true" title="subMenu"></span>
+                @if (!IconMenuActive)
+                {
+                    <span><label>Sub Menu 2</label></span>
+                    <span class="oi chevron-icon @(IsSubMenuOpen("subMenu2") ? "bi bi-arrow-up-short" : "bi bi-arrow-down-short")" aria-hidden="true"></span>
+                }
+            </NavLink>
+            <div class="sub-menu" style="display: @(IsSubMenuOpen("subMenu2") ? "block" : "none")">
+                <NavLink class="nav-link" href="subitem1">
+                    <span class="bi bi-arrow-right-circle" aria-hidden="true" title="Sub Item 1"></span>
+                    @if (!IconMenuActive)
+                    {
+                        <span><label>Sub Menu 2 Item 1</label></span>
+                    }
+                </NavLink>
+                <NavLink class="nav-link" href="subitem2">
+                    <span class="bi bi-arrow-right-circle" aria-hidden="true" title="Sub Item 2"></span>
+                    @if (!IconMenuActive)
+                    {
+                        <span><label>Sub Menu 2 Item 2</label></span>
+                    }
+                </NavLink>
+            </div>
+        </div>
     </nav>
 </div>
+
+<div class="bottom-row">
+    <div class="icon-menu-arrow">
+        @if (!IconMenuActive)
+        {
+            <span class="bi bi-arrow-bar-left" style="color: white;" @onclick="ToggleIconMenu"></span>
+        }
+        else
+        {
+            <span class="bi bi-arrow-bar-right" style="color: white;" @onclick="ToggleIconMenu"></span>
+        }
+    </div>
+</div>
+
+@code
+{
+    [Parameter]
+    public EventCallback<bool> ShowIconMenu { get; set; }
+
+    private bool IconMenuActive { get; set; } = false;
+    private bool collapseNavMenu = true;
+    private string? NavMenuCssClass => collapseNavMenu ? "collapse" : null;
+    private Dictionary<string, bool> subMenuStates = new Dictionary<string, bool>();
+
+    protected override async Task OnAfterRenderAsync(bool firstRender)
+    {
+        if (firstRender)
+        {
+            await JSRuntime.InvokeVoidAsync("setResizeCallback", DotNetObjectReference.Create(this));
+        }
+    }
+
+    [JSInvokable]
+    public async Task OnResize(bool isBelowThreshold)
+    {
+        if (isBelowThreshold && IconMenuActive)
+        {
+            collapseNavMenu = true;
+            await ToggleIconMenu();
+
+            await ShowIconMenu.InvokeAsync(IconMenuActive);
+
+            await InvokeAsync(StateHasChanged);
+        }
+    }
+
+    private void ToggleNavMenu()
+    {
+        collapseNavMenu = !collapseNavMenu;
+    }
+
+    private async Task ToggleIconMenu()
+    {
+        IconMenuActive = !IconMenuActive;
+
+        await ShowIconMenu.InvokeAsync(IconMenuActive);
+    }
+
+    private void ToggleSubMenu(string subMenuKey)
+    {
+        if (subMenuStates.ContainsKey(subMenuKey) && subMenuStates[subMenuKey])
+        {
+            subMenuStates[subMenuKey] = false;
+        }
+        else
+        {
+            foreach (var key in subMenuStates.Keys.ToList())
+            {
+                subMenuStates[key] = false;
+            }
+
+            if (subMenuStates.ContainsKey(subMenuKey))
+            {
+                subMenuStates[subMenuKey] = !subMenuStates[subMenuKey];
+            }
+            else
+            {
+                subMenuStates[subMenuKey] = true;
+            }
+        }
+    }
+
+    private bool IsSubMenuOpen(string subMenuKey)
+    {
+        return subMenuStates.ContainsKey(subMenuKey) && subMenuStates[subMenuKey];
+    }
+}

Blazor_WebAssembly/Blazor_WebAssembly.Client/Layout/NavMenu.razor.css

@@ -1,49 +1,34 @@
 .navbar-toggler {
-    appearance: none;
-    cursor: pointer;
-    width: 3.5rem;
-    height: 2.5rem;
-    color: white;
-    position: absolute;
-    top: 0.5rem;
-    right: 1rem;
-    border: 1px solid rgba(255, 255, 255, 0.1);
-    background: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba%28255, 255, 255, 0.55%29' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e") no-repeat center/1.75rem rgba(255, 255, 255, 0.1);
-}
-
-.navbar-toggler:checked {
-    background-color: rgba(255, 255, 255, 0.5);
+    background-color: rgba(255, 255, 255, 0.1);
 }
 
 .top-row {
     height: 3.5rem;
-    background-color: rgba(0,0,0,0.4);
+    background-color: rgba(0, 0, 0, 0.4);
+}
+
+.bottom-row {
+    position: absolute;
+    bottom: 0;
+    padding-bottom: 10px;
+    text-align: right;
+    width: 100%;
+    padding-right: 28px;
+}
+
+.icon-menu-arrow {
+    text-align: right;
 }
 
 .navbar-brand {
     font-size: 1.1rem;
 }
 
-.bi {
-    display: inline-block;
-    position: relative;
-    width: 1.25rem;
-    height: 1.25rem;
-    margin-right: 0.75rem;
-    top: -1px;
-    background-size: cover;
-}
-
-.bi-house-door-fill-nav-menu {
-    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='white' class='bi bi-house-door-fill' viewBox='0 0 16 16'%3E%3Cpath d='M6.5 14.5v-3.505c0-.245.25-.495.5-.495h2c.25 0 .5.25.5.5v3.5a.5.5 0 0 0 .5.5h4a.5.5 0 0 0 .5-.5v-7a.5.5 0 0 0-.146-.354L13 5.793V2.5a.5.5 0 0 0-.5-.5h-1a.5.5 0 0 0-.5.5v1.293L8.354 1.146a.5.5 0 0 0-.708 0l-6 6A.5.5 0 0 0 1.5 7.5v7a.5.5 0 0 0 .5.5h4a.5.5 0 0 0 .5-.5Z'/%3E%3C/svg%3E");
-}
-
-.bi-plus-square-fill-nav-menu {
-    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='white' class='bi bi-plus-square-fill' viewBox='0 0 16 16'%3E%3Cpath d='M2 0a2 2 0 0 0-2 2v12a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V2a2 2 0 0 0-2-2H2zm6.5 4.5v3h3a.5.5 0 0 1 0 1h-3v3a.5.5 0 0 1-1 0v-3h-3a.5.5 0 0 1 0-1h3v-3a.5.5 0 0 1 1 0z'/%3E%3C/svg%3E");
-}
-
-.bi-list-nested-nav-menu {
-    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='white' class='bi bi-list-nested' viewBox='0 0 16 16'%3E%3Cpath fill-rule='evenodd' d='M4.5 11.5A.5.5 0 0 1 5 11h10a.5.5 0 0 1 0 1H5a.5.5 0 0 1-.5-.5zm-2-4A.5.5 0 0 1 3 7h10a.5.5 0 0 1 0 1H3a.5.5 0 0 1-.5-.5zm-2-4A.5.5 0 0 1 1 3h10a.5.5 0 0 1 0 1H1a.5.5 0 0 1-.5-.5z'/%3E%3C/svg%3E");
+.oi {
+    width: 2rem;
+    font-size: 1.1rem;
+    vertical-align: text-top;
+    top: -2px;
 }
 
 .nav-item {
@@ -59,47 +44,40 @@
         padding-bottom: 1rem;
     }
 
-    .nav-item ::deep .nav-link {
+    .nav-item ::deep a {
         color: #d7d7d7;
-        background: none;
-        border: none;
         border-radius: 4px;
         height: 3rem;
         display: flex;
         align-items: center;
         line-height: 3rem;
-        width: 100%;
     }
 
-.nav-item ::deep a.active {
-    background-color: rgba(255,255,255,0.37);
+        .nav-item ::deep a.active {
+            background-color: rgba(255, 255, 255, 0.25);
             color: white;
-}
+        }
 
-.nav-item ::deep .nav-link:hover {
-    background-color: rgba(255,255,255,0.1);
+        .nav-item ::deep a:hover {
+            background-color: rgba(255, 255, 255, 0.1);
             color: white;
-}
-
-.nav-scrollable {
-    display: none;
-}
-
-.navbar-toggler:checked ~ .nav-scrollable {
-    display: block;
-}
+        }
 
 @media (min-width: 641px) {
     .navbar-toggler {
         display: none;
     }
 
-    .nav-scrollable {
-        /* Never collapse the sidebar for wide screens */
+    .collapse {
         display: block;
-
-        /* Allow sidebar to scroll for tall menus */
-        height: calc(100vh - 3.5rem);
-        overflow-y: auto;
     }
 }
+
+.nav-item label,
+.sub-menu label {
+    margin-left: 8px;
+}
+
+.nav-item .chevron-icon {
+    padding-left: 8px;
+}

Blazor_WebAssembly/Blazor_WebAssembly/Components/App.razor

@@ -8,12 +8,24 @@
     <link rel="stylesheet" href="bootstrap/bootstrap.min.css" />
     <link rel="stylesheet" href="app.css" />
     <link rel="stylesheet" href="Blazor_WebAssembly.styles.css" />
+    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap-icons/font/bootstrap-icons.css">
     <link rel="icon" type="image/png" href="favicon.png" />
     <HeadOutlet @rendermode="InteractiveWebAssembly" />
 </head>
 
 <body>
     <Routes @rendermode="InteractiveWebAssembly" />
+    <script>
+        window.setResizeCallback = (dotNetHelper) => {
+            const resizeCallback = () => {
+                const isBelowThreshold = window.innerWidth < 642;
+                dotNetHelper.invokeMethodAsync('OnResize', isBelowThreshold);
+            };
+
+            window.addEventListener('resize', resizeCallback);
+            resizeCallback();
+        };
+    </script>
     <script src="_framework/blazor.web.js"></script>
 </body>