314 lines
20 KiB
HTML
314 lines
20 KiB
HTML
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<title>Creating Our First Route - 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"><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" class="active"><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="creating-our-first-route"><a class="header" href="#creating-our-first-route">Creating Our First Route</a></h1>
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<p>In this chapter, we will start utilizing Dioxus Router and add a homepage and a
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404 page to our project.</p>
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<h2 id="fundamentals"><a class="header" href="#fundamentals">Fundamentals</a></h2>
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<p>Dioxus Router works based on a <a href="https://docs.rs/dioxus-router/latest/dioxus_router/hooks/fn.use_router.html"><code>use_router</code></a> hook, a route definition in pure
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rust and <a href="https://docs.rs/dioxus-router/latest/dioxus_router/components/fn.Outlet.html"><code>Outlet</code></a> components. If you've ever used <a href="https://router.vuejs.org/">Vue Router</a>, you should
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feel right at home with Dioxus Router.</p>
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<p>First we need an actual page to route to! Let's add a homepage component:</p>
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<pre><pre class="playground"><code class="language-rust no_run 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><span class="boring">use dioxus::prelude::*;
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</span><span class="boring">
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</span>fn Home(cx: Scope) -> Element {
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render! {
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h1 { "Welcome to the Dioxus Blog!" }
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}
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}
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<span class="boring">}
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</span></code></pre></pre>
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<h2 id="to-route-or-not-to-route"><a class="header" href="#to-route-or-not-to-route">To Route or Not to Route</a></h2>
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<p>We want to use Dioxus Router to separate our application into different "pages".
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Dioxus Router will then determine which page to render based on the URL path.</p>
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<p>To start using Dioxus Router, we need to use the <a href="https://docs.rs/dioxus-router/latest/dioxus_router/hooks/fn.use_router.html"><code>use_router</code></a> hook. All other
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hooks and components the router provides can only be used as a descendant of a
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component calling <a href="https://docs.rs/dioxus-router/latest/dioxus_router/hooks/fn.use_router.html"><code>use_router</code></a>.</p>
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<p>The <a href="https://docs.rs/dioxus-router/latest/dioxus_router/hooks/fn.use_router.html"><code>use_router</code></a> hook takes three arguments:</p>
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<ol>
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<li><code>cx</code>, which is a common argument for all hooks.</li>
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<li>A <a href="https://docs.rs/dioxus-router/latest/dioxus_router/hooks/struct.RouterConfiguration.html"><code>RouterConfiguration</code></a>, which allows us to modify its behavior.</li>
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<li>A definition of all routes the application contains, in the form of its root
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<a href="https://docs.rs/dioxus-router-core/latest/dioxus_router_core/routes/struct.Segment.html"><code>Segment</code></a>.</li>
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</ol>
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<pre><pre class="playground"><code class="language-rust no_run 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::prelude::*;
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<span class="boring">fn Home(cx: Scope) -> Element { unimplemented!() }
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</span>
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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::default(),
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&|| Segment::content(comp(Home))
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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></code></pre></pre>
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<p>If you head to your application's browser tab, you should now see the text
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<code>Welcome to Dioxus Blog!</code> when on the root URL (<code>http://localhost:8080/</code>). If
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you enter a different path for the URL, nothing should be displayed.</p>
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<p>This is because we told Dioxus Router to render the <code>Home</code> component only when
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the URL path is <code>/</code>. The <em>index</em> (<code>Segment::content()</code>) functionality we used
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basically emulates how web servers treat <code>index.html</code> files.</p>
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<h2 id="what-if-a-route-doesnt-exist"><a class="header" href="#what-if-a-route-doesnt-exist">What if a Route Doesn't Exist?</a></h2>
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<p>In our example Dioxus Router doesn't render anything. Many sites also have a
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"404" page for when a URL path leads to nowhere. Dioxus Router can do this too!</p>
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<p>First, we create a new <code>PageNotFound</code> component.</p>
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<pre><pre class="playground"><code class="language-rust no_run 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><span class="boring">use dioxus::prelude::*;
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</span><span class="boring">
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</span>fn PageNotFound(cx: Scope) -> Element {
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render! {
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h1 { "Page not found" }
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p { "We are terribly sorry, but the page you requested doesn't exist." }
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}
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}
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<span class="boring">}
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</span></code></pre></pre>
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<p>Now to tell Dioxus Router to render our new component when no route exists.</p>
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<pre><pre class="playground"><code class="language-rust no_run 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><span class="boring">use dioxus::prelude::*;
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</span><span class="boring">extern crate dioxus_router;
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</span><span class="boring">use dioxus_router::prelude::*;
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</span><span class="boring">fn Home(cx: Scope) -> Element { unimplemented!() }
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</span><span class="boring">fn PageNotFound(cx: Scope) -> Element { unimplemented!() }
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</span><span class="boring">
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</span>fn App(cx: Scope) -> Element {
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use_router(
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cx,
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&|| RouterConfiguration::default(),
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&|| {
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Segment::content(comp(Home))
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.fallback(comp(PageNotFound)) // this is new
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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></code></pre></pre>
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<p>Now when you go to a route that doesn't exist, you should see the page not found
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text.</p>
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<h2 id="conclusion"><a class="header" href="#conclusion">Conclusion</a></h2>
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<p>In this chapter we learned how to create a route and tell Dioxus Router what
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component to render when the URL path is <code>/</code>. We also created a 404 page to
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handle when a route doesn't exist. Next, we'll create the blog portion of our
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site. We will utilize nested routes and URL parameters.</p>
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</main>
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<nav class="nav-wrapper" aria-label="Page navigation">
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<!-- Mobile navigation buttons -->
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<a rel="prev" href="../example/index.html" class="mobile-nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
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</a>
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<a rel="next" href="../example/building-a-nest.html" class="mobile-nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right">
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</a>
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</nav>
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