331 lines
20 KiB
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331 lines
20 KiB
HTML
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<title>Fallback Routes (404 page) - Dioxus Router</title>
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<ol class="chapter"><li class="chapter-item expanded affix "><a href="../../index.html">Introduction</a></li><li class="chapter-item expanded affix "><li class="part-title">Features</li><li class="chapter-item expanded "><a href="../../features/index.html"><strong aria-hidden="true">1.</strong> Adding the Router to Your Application</a></li><li class="chapter-item expanded "><a href="../../features/routes/index.html"><strong aria-hidden="true">2.</strong> Defining Routes</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../../features/routes/nested.html"><strong aria-hidden="true">2.1.</strong> Nested Routes</a></li><li class="chapter-item expanded "><a href="../../features/routes/catch_all.html"><strong aria-hidden="true">2.2.</strong> Catch All Routes</a></li><li class="chapter-item expanded "><a href="../../features/routes/matching.html"><strong aria-hidden="true">2.3.</strong> Matching Routes</a></li><li class="chapter-item expanded "><a href="../../features/routes/fallback.html" class="active"><strong aria-hidden="true">2.4.</strong> Fallback Routes (404 page)</a></li><li class="chapter-item expanded "><a href="../../features/routes/multiple-and-redirect.html"><strong aria-hidden="true">2.5.</strong> Multiple Components & Redirects</a></li></ol></li><li class="chapter-item expanded "><a href="../../features/outlets.html"><strong aria-hidden="true">3.</strong> Outlets</a></li><li class="chapter-item expanded "><a href="../../features/navigation/index.html"><strong aria-hidden="true">4.</strong> Links & Navigation</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../../features/navigation/name.html"><strong aria-hidden="true">4.1.</strong> Named Navigation</a></li><li class="chapter-item expanded "><a href="../../features/navigation/external.html"><strong aria-hidden="true">4.2.</strong> External Navigation</a></li><li class="chapter-item expanded "><a href="../../features/navigation/programmatic.html"><strong aria-hidden="true">4.3.</strong> Programmatic Navigation</a></li></ol></li><li class="chapter-item expanded "><a href="../../features/query.html"><strong aria-hidden="true">5.</strong> Query</a></li><li class="chapter-item expanded "><a href="../../features/failures/index.html"><strong aria-hidden="true">6.</strong> Navigation Failures</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../../features/failures/named.html"><strong aria-hidden="true">6.1.</strong> Named Navigation Failure</a></li><li class="chapter-item expanded "><a href="../../features/failures/external.html"><strong aria-hidden="true">6.2.</strong> External Navigation Failure</a></li><li class="chapter-item expanded "><a href="../../features/failures/redirection-limit.html"><strong aria-hidden="true">6.3.</strong> Redirection Limit Failure</a></li></ol></li><li class="chapter-item expanded "><a href="../../features/history-providers.html"><strong aria-hidden="true">7.</strong> History Providers</a></li><li class="chapter-item expanded "><a href="../../features/history-buttons.html"><strong aria-hidden="true">8.</strong> History Buttons</a></li><li class="chapter-item expanded "><a href="../../features/sitemap-generation.html"><strong aria-hidden="true">9.</strong> Sitemap Generation</a></li><li class="chapter-item expanded "><a href="../../features/routing-update-callback.html"><strong aria-hidden="true">10.</strong> Routing Update Callback</a></li><li class="chapter-item expanded affix "><li class="part-title">Example Project</li><li class="chapter-item expanded "><a href="../../example/index.html"><strong aria-hidden="true">11.</strong> Overview</a></li><li class="chapter-item expanded "><a href="../../example/first-route.html"><strong aria-hidden="true">12.</strong> Creating Our First Route</a></li><li class="chapter-item expanded "><a href="../../example/building-a-nest.html"><strong aria-hidden="true">13.</strong> Building a Nest</a></li><li class="chapter-item expanded "><a href="../../example/navigation-targets.html"><strong aria-hidden="true">14.</strong> Navigation Targets</a></li><li class="chapter-item expanded "><a href="../../example/redirection-perfection.html"><strong aria-hidden="true">15.</strong> Redirection Perfection</a></li><li class="chapter-item expanded "><a href="../../example/full-code.html"><strong aria-hidden="true">16.</strong> Full Code</a></li></ol>
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<h1 class="menu-title">Dioxus Router</h1>
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<div id="content" class="content">
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<main>
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<h1 id="fallback-routes"><a class="header" href="#fallback-routes">Fallback Routes</a></h1>
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<p>Sometimes the router might be unable to find a route for the provided path. We
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might want it to show a prepared error message to our users in that case.
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Fallback routes allow us to do that.</p>
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<blockquote>
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<p>This is especially important for use cases where users can manually change the
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path, like web apps running in the browser.</p>
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</blockquote>
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<h2 id="a-single-global-fallback"><a class="header" href="#a-single-global-fallback">A single global fallback</a></h2>
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<p>To catch all cases of invalid paths within our app, we can simply add a fallback
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route to our root <a href="https://docs.rs/dioxus-router-core/latest/dioxus_router_core/routes/struct.Segment.html"><code>Segment</code></a>.</p>
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<pre><pre class="playground"><code class="language-rust edition2021">
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<span class="boring">#![allow(unused)]
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</span><span class="boring">fn main() {
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</span><span class="boring">// Hidden lines (like this one) make the documentation tests work.
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</span><span class="boring">extern crate dioxus;
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</span>use dioxus::prelude::*;
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<span class="boring">extern crate dioxus_router;
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</span>use dioxus_router::{history::MemoryHistory, prelude::*};
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<span class="boring">extern crate dioxus_ssr;
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</span>
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fn Index(cx: Scope) -> Element {
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render! {
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h1 { "Index" }
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}
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}
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fn Fallback(cx: Scope) -> Element {
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render! {
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h1 { "Error 404 - Not Found" }
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p { "The page you asked for doesn't exist." }
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}
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}
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fn App(cx: Scope) -> Element {
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use_router(
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cx,
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&|| RouterConfiguration {
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<span class="boring"> synchronous: true,
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</span><span class="boring"> history: Box::new(MemoryHistory::with_initial_path("/invalid").unwrap()),
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</span> ..Default::default()
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},
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&|| {
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Segment::content(comp(Index)).fallback(comp(Fallback))
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}
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);
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render! {
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Outlet { }
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}
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}
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<span class="boring">
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</span><span class="boring">let mut vdom = VirtualDom::new(App);
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</span><span class="boring">vdom.rebuild();
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</span><span class="boring">assert_eq!(
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</span><span class="boring"> dioxus_ssr::render(&vdom),
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</span><span class="boring"> "<h1>Error 404 - Not Found</h1><p>The page you asked for doesn't exist.</p>"
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</span><span class="boring">);
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</span><span class="boring">}
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</span></code></pre></pre>
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<h2 id="more-specific-fallback-routes"><a class="header" href="#more-specific-fallback-routes">More specific fallback routes</a></h2>
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<p>In some cases we might want to show different fallback content depending on what
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section of our app the user is in.</p>
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<p>For example, our app might have several settings pages under <code>/settings</code>, such
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as the password settings <code>/settings/password</code> or the privacy settings
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<code>/settings/privacy</code>. When our user is in the settings section, we want to show
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them <em>"settings not found"</em> instead of <em>"page not found"</em>.</p>
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<p>We can easily do that by setting a fallback route on our nested <a href="https://docs.rs/dioxus-router-core/latest/dioxus_router_core/routes/struct.Segment.html"><code>Segment</code></a>. It
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will then replace the global fallback whenever our <a href="https://docs.rs/dioxus-router-core/latest/dioxus_router_core/routes/struct.Segment.html"><code>Segment</code></a> was active.</p>
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<p>Note the <code>.clear_fallback(false)</code> part. If we didn't add this, the fallback
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content would be rendered inside the <code>Settings</code> component.</p>
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<pre><pre class="playground"><code class="language-rust edition2021">
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<span class="boring">#![allow(unused)]
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</span><span class="boring">fn main() {
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</span><span class="boring">// Hidden lines (like this one) make the documentation tests work.
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</span><span class="boring">extern crate dioxus;
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</span>use dioxus::prelude::*;
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<span class="boring">extern crate dioxus_router;
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</span>use dioxus_router::{history::MemoryHistory, prelude::*};
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<span class="boring">extern crate dioxus_ssr;
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</span>
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// This example doesn't show the index or settings components. It only shows how
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// to set up several fallback routes.
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<span class="boring">fn Index(cx: Scope) -> Element { unimplemented!() }
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</span><span class="boring">fn Settings(cx: Scope) -> Element { unimplemented!() }
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</span><span class="boring">fn GeneralSettings(cx: Scope) -> Element { unimplemented!() }
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</span><span class="boring">fn PasswordSettings(cx: Scope) -> Element { unimplemented!() }
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</span><span class="boring">fn PrivacySettings(cx: Scope) -> Element { unimplemented!() }
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</span>
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fn GlobalFallback(cx: Scope) -> Element {
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render! {
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h1 { "Error 404 - Page Not Found" }
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}
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}
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fn SettingsFallback(cx: Scope) -> Element {
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render! {
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h1 { "Error 404 - Settings Not Found" }
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}
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}
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fn App(cx: Scope) -> Element {
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use_router(
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cx,
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&|| RouterConfiguration {
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<span class="boring"> synchronous: true,
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</span><span class="boring"> history: Box::new(MemoryHistory::with_initial_path("/settings/invalid").unwrap()),
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</span> ..Default::default()
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},
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&|| {
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Segment::empty()
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.fixed("settings", Route::content(comp(Settings)).nested(
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Segment::content(comp(GeneralSettings))
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.fixed("password", comp(PasswordSettings))
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.fixed("privacy", comp(PrivacySettings))
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.fallback(comp(SettingsFallback))
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.clear_fallback(true)
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))
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.fallback(comp(GlobalFallback))
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}
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);
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render! {
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Outlet { }
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}
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}
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<span class="boring">
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</span><span class="boring">let mut vdom = VirtualDom::new(App);
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</span><span class="boring">vdom.rebuild();
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</span><span class="boring">assert_eq!(
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</span><span class="boring"> dioxus_ssr::render(&vdom),
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</span><span class="boring"> "<h1>Error 404 - Settings Not Found</h1>"
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</span><span class="boring">);
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</span><span class="boring">}
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</span></code></pre></pre>
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