【发布时间】:2020-09-14 09:37:57
【问题描述】:
最近我在我的 Blazor WebAssembly 项目中创建了一个自定义导航菜单(使用 TailwindCSS)。 根据设备宽度,显示/隐藏侧边栏(使用 Tailwind hidden 和 device-with CSS 类)。
在特定的设备宽度上显示一个菜单按钮,一个特定于移动侧边栏的 div 始终隐藏(显示:无),在 Blazor 中我创建了一个 @onclick 函数来设置样式移动侧边栏清空(因此显示:没有被删除),反之亦然。
这一切都很完美,但是这种方法存在一个问题。单击菜单按钮时,将显示移动侧边栏,如果我现在增加设备宽度,则菜单按钮将自动隐藏,移动侧边栏也是如此,如果我再次减小设备宽度,则菜单按钮再次显示,但“打开”侧边栏 div 也被显示(因为在最后一个较小的设备宽度也被打开(显示样式:无被删除)。
行为应该是,当设备宽度增加时,移动侧栏应该始终保持其样式属性 display:none。
不过,据我所知,Blazor 中没有在changed device width 上触发的事件?有什么办法可以让它工作吗?
下面是一些显示“问题”的图片和 HTML 代码:
移动端视图:
所以问题是当我从Mobile sidebar opened view回到Normal size view再回到Mobile view时,它会显示Mobile sidebar opened view而不是(因为它仍然有一个空的样式属性,相当于display: block)
HTML / Blazor C# 代码:
<div class="md:hidden" style=@mobileSideBarDisplay> <!-- Blazor C# string that sets the display to display: none, or removes the display entirely to show it)
<div class="fixed inset-0 flex z-40">
<!--
Off-canvas menu overlay, show/hide based on off-canvas menu state.
Entering: "transition-opacity ease-linear duration-300"
From: "opacity-0"
To: "opacity-100"
Leaving: "transition-opacity ease-linear duration-300"
From: "opacity-100"
To: "opacity-0"
-->
<div class="fixed inset-0">
<div class="absolute inset-0 bg-gray-600 opacity-75"></div>
</div>
<!-- The menu item with is Blazor onclick event -->
<div class="relative flex-1 flex flex-col max-w-xs w-full pt-5 pb-4 bg-gray-800">
<div class="absolute top-0 right-0 -mr-14 p-1">
<button class="flex items-center justify-center h-12 w-12 rounded-full focus:outline-none focus:bg-gray-600" aria-label="Close sidebar" @onclick="ToggleSidebar">
<svg class="h-6 w-6 text-white" stroke="currentColor" fill="none" viewBox="0 0 24 24">
<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M6 18L18 6M6 6l12 12" />
</svg>
</button>
</div>
<! -- rest of HTML, left out for readability -->
</div>
</div>
</div>
<!-- Static sidebar for desktop -->
<div class="hidden md:flex md:flex-shrink-0">
<div class="flex flex-col w-64">
<! -- rest of HTML, left out for readability -->
</div>
</div>
<!-- Horizontal navbar with the Menu button -->
<div class="flex flex-col w-0 flex-1 overflow-hidden">
<div class="relative z-10 flex-shrink-0 flex h-16 bg-white shadow">
<!-- menu button becomes visible at a certain device-width > done with the TailWind CSS class md:hidden -->
<button class="px-4 border-r border-gray-200 text-gray-500 focus:outline-none focus:bg-gray-100 focus:text-gray-600 md:hidden" aria-label="Open sidebar" @onclick="ToggleSidebar">
<svg class="h-6 w-6" stroke="currentColor" fill="none" viewBox="0 0 24 24">
<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M4 6h16M4 12h16M4 18h7" />
</svg>
</button>
<! -- rest of HTML, left out for readability -->
</div>
</div>
<!-- C# code for viewing mobile sidebar on Menu button press -->
@code {
private bool showMobileSideBar = false;
private string mobileSideBarDisplay => showMobileSideBar ? "" : "display: none;";
private void ToggleSidebar()
{
showMobileSideBar = !showMobileSideBar;
}
}
【问题讨论】: