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Introduction
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Route Syntax
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Router
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Path-based Routing
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Name-based Routing
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Route Data
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Route Data Validation
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Route Conflicts
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Coercion Explained
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Plumatic Schema
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<li class="chapter " data-level="3.3" data-path="../coercion/clojure_spec_coercion.html">
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Clojure.spec
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Data-specs
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<li class="header">Ring</li>
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Ring-router
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Reverse-routing
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<a href="../ring/default_handler.html">
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Default handler
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Static Resources
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Dynamic Extensions
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<li class="chapter " data-level="4.6" data-path="../ring/data_driven_middleware.html">
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<a href="../ring/data_driven_middleware.html">
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Data-driven Middleware
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<li class="chapter " data-level="4.7" data-path="../ring/transforming_middleware_chain.html">
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Transforming Middleware Chain
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</a>
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</li>
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<li class="chapter " data-level="4.8" data-path="../ring/middleware_registry.html">
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<a href="../ring/middleware_registry.html">
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Middleware Registry
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</a>
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</li>
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<li class="chapter " data-level="4.9" data-path="../ring/default_middleware.html">
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<a href="../ring/default_middleware.html">
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Default Middleware
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</a>
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</li>
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<li class="chapter " data-level="4.10" data-path="../ring/coercion.html">
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<a href="../ring/coercion.html">
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Pluggable Coercion
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</a>
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</li>
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<li class="chapter " data-level="4.11" data-path="../ring/route_data_validation.html">
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<a href="../ring/route_data_validation.html">
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Route Data Validation
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</a>
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</li>
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<li class="chapter " data-level="4.12" data-path="../ring/compiling_middleware.html">
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<a href="../ring/compiling_middleware.html">
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Compiling Middleware
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</a>
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<li class="chapter " data-level="4.13" data-path="../ring/swagger.html">
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<a href="../ring/swagger.html">
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Swagger Support
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</a>
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<li class="header">HTTP</li>
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<li class="chapter " data-level="5.1" data-path="../http/interceptors.html">
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<a href="../http/interceptors.html">
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Interceptors
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</a>
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</li>
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<li class="chapter " data-level="5.2" data-path="../http/pedestal.html">
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<a href="../http/pedestal.html">
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Pedestal
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</a>
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</li>
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<li class="chapter " data-level="5.3" data-path="../http/sieppari.html">
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<a href="../http/sieppari.html">
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Sieppari
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</a>
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<li class="chapter " data-level="5.4" data-path="../http/default_interceptors.html">
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Default Interceptors
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</a>
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<li class="header">Frontend</li>
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<li class="chapter " data-level="6.1" data-path="basics.html">
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<a href="basics.html">
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Basics
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</a>
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</li>
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<li class="chapter " data-level="6.2" data-path="browser.html">
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<a href="browser.html">
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Browser integration
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</a>
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</li>
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<li class="chapter active" data-level="6.3" data-path="controllers.html">
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<a href="controllers.html">
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Controllers
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</a>
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<li class="header">Advanced</li>
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<li class="chapter " data-level="7.1" data-path="../advanced/configuring_routers.html">
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<a href="../advanced/configuring_routers.html">
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Configuring Routers
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</a>
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</li>
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<li class="chapter " data-level="7.2" data-path="../advanced/composing_routers.html">
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<a href="../advanced/composing_routers.html">
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Composing Routers
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</a>
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</li>
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<li class="chapter " data-level="7.3" data-path="../advanced/different_routers.html">
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<a href="../advanced/different_routers.html">
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Different Routers
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</a>
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</li>
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<li class="chapter " data-level="7.4" data-path="../advanced/route_validation.html">
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<a href="../advanced/route_validation.html">
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Route Validation
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</a>
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</li>
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<li class="chapter " data-level="7.5" data-path="../advanced/dev_workflow.html">
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<a href="../advanced/dev_workflow.html">
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Dev Workflow
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</a>
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</li>
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<li class="chapter " data-level="7.6" data-path="../advanced/shared_routes.html">
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<a href="../advanced/shared_routes.html">
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Shared Routes
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</a>
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</li>
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<li class="header">Misc</li>
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<li class="chapter " data-level="8.1" data-path="../performance.html">
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<a href="../performance.html">
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Performance
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</a>
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</li>
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<li class="chapter " data-level="8.2" data-path="../development.html">
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<a href="../development.html">
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Development Instructions
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</a>
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</li>
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<li class="chapter " data-level="8.3" data-path="../faq.html">
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<a href="../faq.html">
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FAQ
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</a>
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</li>
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<li class="divider"></li>
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<li>
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<a href="https://www.gitbook.com" target="blank" class="gitbook-link">
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Published with GitBook
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</ul>
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</nav>
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</div>
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<div class="book-body">
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<div class="body-inner">
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<div class="book-header" role="navigation">
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<!-- Title -->
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<h1>
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<i class="fa fa-circle-o-notch fa-spin"></i>
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<a href=".." >Controllers</a>
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</h1>
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</div>
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<div class="page-wrapper" tabindex="-1" role="main">
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<div class="page-inner">
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<div id="book-search-results">
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<div class="search-noresults">
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<section class="normal markdown-section">
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<h1 id="controllers">Controllers</h1>
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<ul>
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<li><a href="https://github.com/metosin/reitit/tree/master/examples/frontend-controllers" target="_blank">https://github.com/metosin/reitit/tree/master/examples/frontend-controllers</a></li>
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</ul>
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<p>Controllers run code when a route is entered and left. This can be useful to:</p>
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<ul>
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<li>Load resources</li>
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<li>Update application state</li>
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</ul>
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<h2 id="authentication">Authentication</h2>
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<p>Controllers can be used to load resources from a server. If and when your
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API requires authentication you will need to implement logic to prevent controllers
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trying to do requests if user isn't authenticated yet.</p>
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<h3 id="run-controllers-and-check-authentication">Run controllers and check authentication</h3>
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<p>If you have both unauthenticated and authenticated resources, you can
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run the controllers always and then check the authentication status
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on controller code, or on the code called from controllers (e.g. re-frame event
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handler).</p>
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<h3 id="disable-controllers-until-user-is-authenticated">Disable controllers until user is authenticated</h3>
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<p>If all your resources require authentication an easy way to prevent bad
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requests is to enable controllers only after authentication is done.
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To do this you can check authentication status and call <code>apply-controllers</code>
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only after authentication is done (also remember to manually call <code>apply-controllers</code>
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with current <code>match</code> when authentication is done). Or if no navigation is possible
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before authentication is done, you can start the router only after
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authentication is done.</p>
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<h2 id="alternatives">Alternatives</h2>
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<p>Similar solution could be used to describe required resources as data (maybe
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even GraphQL query) per route, and then have code automatically load
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missing resources.</p>
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</section>
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