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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" class="active"><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 &amp; 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 &amp; 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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<h1 id="catch-all-routes"><a class="header" href="#catch-all-routes">Catch All Routes</a></h1>
<p>Many modern web apps store parameters within their current path. This allows
users to share URLs that link to a specific bit of content. We can create this
functionality with catch all routes.</p>
<blockquote>
<p>If you want to change what route is active based on the format of the
parameter, see <a href="./matching.html">Matching Routes</a>.</p>
</blockquote>
<blockquote>
<p>The parameter will be URL decoded.</p>
</blockquote>
<h2 id="creating-a-content-component"><a class="header" href="#creating-a-content-component">Creating a content component</a></h2>
<p>We start by creating a component that uses the parameters value.</p>
<p>We can get the current state of the router using the <a href="https://docs.rs/dioxus-router/latest/dioxus_router/hooks/fn.use_route.html"><code>use_route</code></a> hook. From
that state we can extract the current value of our parameter by using a key we
will later also define on our route.</p>
<blockquote>
<p>It is <strong>VERY IMPORTANT</strong> to drop the object returned by the <a href="https://docs.rs/dioxus-router/latest/dioxus_router/hooks/fn.use_route.html"><code>use_route</code></a>
hook once our component finished rendering. Otherwise the entire router will
be frozen.</p>
</blockquote>
<blockquote>
<p>The <a href="https://docs.rs/dioxus-router/latest/dioxus_router/hooks/fn.use_route.html"><code>use_route</code></a> hook can only be used in components nested within a
component that called <a href="https://docs.rs/dioxus-router/latest/dioxus_router/hooks/fn.use_router.html"><code>use_router</code></a>.</p>
</blockquote>
<pre><pre class="playground"><code class="language-rust no_run edition2021">
<span class="boring">#![allow(unused)]
</span><span class="boring">fn main() {
</span><span class="boring">// Hidden lines (like this one) make the documentation tests work.
</span><span class="boring">extern crate dioxus;
</span>use dioxus::prelude::*;
<span class="boring">extern crate dioxus_router;
</span>use dioxus_router::prelude::*;
struct Name;
fn Greeting(cx: Scope) -&gt; Element {
let route = use_route(cx).expect(&quot;is nested within a Router component&quot;);
let name = route.parameter::&lt;Name&gt;()
.map(|name| name.clone())
.unwrap_or(String::from(&quot;world&quot;));
render! {
p { &quot;Hello, {name}!&quot; }
}
}
<span class="boring">}
</span></code></pre></pre>
<h2 id="defining-the-routes"><a class="header" href="#defining-the-routes">Defining the routes</a></h2>
<p>Now we can define our route. Unlike a fixed <a href="https://docs.rs/dioxus-router-core/latest/dioxus_router_core/routes/struct.Route.html"><code>Route</code></a>, a <a href="https://docs.rs/dioxus-router-core/latest/dioxus_router_core/routes/struct.ParameterRoute.html"><code>ParameterRoute</code></a>
needs two arguments to be created.</p>
<blockquote>
<p>Also note that each <a href="https://docs.rs/dioxus-router-core/latest/dioxus_router_core/routes/struct.Segment.html"><code>Segment</code></a> can have exactly one parameter or
<a href="./fallback.html">fallback route</a>.</p>
<p>For that reason, the example below would not work in practice, but showing
both forms (explicit and short) is more important for this example.</p>
</blockquote>
<pre><pre class="playground"><code class="language-rust no_run edition2021">
<span class="boring">#![allow(unused)]
</span><span class="boring">fn main() {
</span><span class="boring">// Hidden lines (like this one) make the documentation tests work.
</span><span class="boring">extern crate dioxus;
</span><span class="boring">use dioxus::prelude::*;
</span><span class="boring">extern crate dioxus_router;
</span><span class="boring">use dioxus_router::prelude::*;
</span><span class="boring">fn Greeting(cx: Scope) -&gt; Element { unimplemented!() }
</span><span class="boring">
</span>struct Name;
fn App(cx: Scope) -&gt; Element {
use_router(
cx,
&amp;|| RouterConfiguration {
..Default::default()
},
&amp;|| {
Segment::empty()
.catch_all(ParameterRoute::content::&lt;Name&gt;(comp(Greeting)))
.catch_all((comp(Greeting), Name { })) // same in short
}
);
// ...
<span class="boring"> unimplemented!()
</span>}
<span class="boring">}
</span></code></pre></pre>
<h2 id="interaction-with-other-routes"><a class="header" href="#interaction-with-other-routes">Interaction with other routes</a></h2>
<p>Each individual <a href="https://docs.rs/dioxus-router-core/latest/dioxus_router_core/routes/struct.Segment.html"><code>Segment</code></a> can only ever have one active route. This means that
when a <a href="https://docs.rs/dioxus-router-core/latest/dioxus_router_core/routes/struct.Segment.html"><code>Segment</code></a> has more than just a catch all route, the router has to
decide which is active. It does that this way:</p>
<ol start="0">
<li>If the segment is not specified (i.e. <code>/</code>), then the index route will be
active.</li>
<li>If a <a href="./index.html#fixed-routes"><em>fixed</em></a> route matches the current path, it
will be active.</li>
<li>If a <a href="./matching.html"><em>matching</em> route</a> matches the current path, it will be
active. <em>Matching</em> routes are checked in the order they are defined.</li>
<li>If neither a <em>fixed</em> nor a <em>matching</em> route is active, the <em>catch all</em> route
or <a href="./fallback.html"><em>fallback</em> route</a> will be.</li>
</ol>
<p>Step 0 means that if we want a parameter to be empty, that needs to be specified
by the path, i.e. <code>//</code>.</p>
<blockquote>
<p>Be careful with using catch all routes on the root <a href="https://docs.rs/dioxus-router-core/latest/dioxus_router_core/routes/struct.Segment.html"><code>Segment</code></a>. Navigating to
paths starting with <code>//</code> will <strong>NOT</strong> work. This is not a limitation of the
router, but rather of how relative URLs work.</p>
<p>If you absolutely need an empty parameter on the root <a href="https://docs.rs/dioxus-router-core/latest/dioxus_router_core/routes/struct.Segment.html"><code>Segment</code></a>, a URL like
this <em>could</em> work:</p>
<ul>
<li><code>https://your-site.example//</code> for web sites</li>
<li><code>dioxus://index.html//</code> for desktop apps</li>
</ul>
</blockquote>
<h2 id="full-code"><a class="header" href="#full-code">Full Code</a></h2>
<pre><pre class="playground"><code class="language-rust edition2021">
<span class="boring">#![allow(unused)]
</span><span class="boring">fn main() {
</span><span class="boring">// Hidden lines (like this one) make the documentation tests work.
</span><span class="boring">extern crate dioxus;
</span><span class="boring">use dioxus::prelude::*;
</span><span class="boring">extern crate dioxus_router;
</span><span class="boring">use dioxus_router::{history::MemoryHistory, prelude::*};
</span><span class="boring">extern crate dioxus_ssr;
</span><span class="boring">
</span>struct Name;
fn Greeting(cx: Scope) -&gt; Element {
let route = use_route(cx).expect(&quot;is nested within a Router component&quot;);
let name = route.parameter::&lt;Name&gt;()
.map(|name| name.clone())
.unwrap_or(String::from(&quot;world&quot;));
render! {
p { &quot;Hello, {name}!&quot; }
}
}
fn App(cx: Scope) -&gt; Element {
let routes = use_router(
cx,
&amp;|| RouterConfiguration {
<span class="boring"> synchronous: true,
</span><span class="boring"> history: Box::new(MemoryHistory::with_initial_path(&quot;/Dioxus&quot;).unwrap()),
</span> ..Default::default()
},
&amp;|| Segment::empty().catch_all((comp(Greeting), Name { }))
);
// ...
render! {
Outlet { }
}
}
<span class="boring">
</span><span class="boring">let mut vdom = VirtualDom::new(App);
</span><span class="boring">vdom.rebuild();
</span><span class="boring">assert_eq!(
</span><span class="boring"> dioxus_ssr::render(&amp;vdom),
</span><span class="boring"> &quot;&lt;p&gt;Hello, Dioxus!&lt;/p&gt;&quot;
</span><span class="boring">);
</span><span class="boring">}
</span></code></pre></pre>
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