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| <h2 id="toc-title">On this page</h2> | |
| <ul> | |
| <li><a href="#database-table-creation---use-dataclasses-and-idempotent-patterns" id="toc-database-table-creation---use-dataclasses-and-idempotent-patterns" class="nav-link active" data-scroll-target="#database-table-creation---use-dataclasses-and-idempotent-patterns">Database Table Creation - Use dataclasses and idempotent patterns</a></li> | |
| <li><a href="#route-naming-conventions---let-function-names-define-routes" id="toc-route-naming-conventions---let-function-names-define-routes" class="nav-link" data-scroll-target="#route-naming-conventions---let-function-names-define-routes">Route Naming Conventions - Let function names define routes</a></li> | |
| <li><a href="#query-parameters-over-path-parameters---cleaner-url-patterns" id="toc-query-parameters-over-path-parameters---cleaner-url-patterns" class="nav-link" data-scroll-target="#query-parameters-over-path-parameters---cleaner-url-patterns">Query Parameters over Path Parameters - Cleaner URL patterns</a></li> | |
| <li><a href="#leverage-return-values---chain-operations-in-one-line" id="toc-leverage-return-values---chain-operations-in-one-line" class="nav-link" data-scroll-target="#leverage-return-values---chain-operations-in-one-line">Leverage Return Values - Chain operations in one line</a></li> | |
| <li><a href="#use-.to-for-url-generation---type-safe-route-references" id="toc-use-.to-for-url-generation---type-safe-route-references" class="nav-link" data-scroll-target="#use-.to-for-url-generation---type-safe-route-references">Use <code>.to()</code> for URL Generation - Type-safe route references</a></li> | |
| <li><a href="#built-in-css-frameworks---picocss-comes-free-with-fast_app" id="toc-built-in-css-frameworks---picocss-comes-free-with-fast_app" class="nav-link" data-scroll-target="#built-in-css-frameworks---picocss-comes-free-with-fast_app">Built-in CSS Frameworks - PicoCSS comes free with fast_app()</a></li> | |
| <li><a href="#smart-defaults---titled-creates-container-serve-handles-main" id="toc-smart-defaults---titled-creates-container-serve-handles-main" class="nav-link" data-scroll-target="#smart-defaults---titled-creates-container-serve-handles-main">Smart Defaults - Titled creates Container, serve() handles main</a></li> | |
| <li><a href="#fasthtml-handles-iterables---no-unpacking-needed-for-generators" id="toc-fasthtml-handles-iterables---no-unpacking-needed-for-generators" class="nav-link" data-scroll-target="#fasthtml-handles-iterables---no-unpacking-needed-for-generators">FastHTML Handles Iterables - No unpacking needed for generators</a></li> | |
| <li><a href="#functional-patterns---use-map-over-list-comprehensions" id="toc-functional-patterns---use-map-over-list-comprehensions" class="nav-link" data-scroll-target="#functional-patterns---use-map-over-list-comprehensions">Functional Patterns - Use map() over list comprehensions</a></li> | |
| <li><a href="#minimal-code---remove-comments-and-unnecessary-returns" id="toc-minimal-code---remove-comments-and-unnecessary-returns" class="nav-link" data-scroll-target="#minimal-code---remove-comments-and-unnecessary-returns">Minimal Code - Remove comments and unnecessary returns</a></li> | |
| <li><a href="#use-post-for-all-mutations" id="toc-use-post-for-all-mutations" class="nav-link" data-scroll-target="#use-post-for-all-mutations">Use POST for All Mutations</a></li> | |
| <li><a href="#modern-htmx-event-syntax" id="toc-modern-htmx-event-syntax" class="nav-link" data-scroll-target="#modern-htmx-event-syntax">Modern HTMX Event Syntax</a></li> | |
| </ul> | |
| <div class="toc-actions"><ul><li><a href="https://github.com/AnswerDotAI/fasthtml/issues/new" class="toc-action"><i class="bi bi-github"></i>Report an issue</a></li></ul></div><div class="quarto-alternate-formats"><h2>Other Formats</h2><ul><li><a href="best_practice.md"><i class="bi bi-file-code"></i>CommonMark</a></li></ul></div></nav> | |
| </div> | |
| <!-- main --> | |
| <main class="content page-columns page-full" id="quarto-document-content"> | |
| <header id="title-block-header" class="quarto-title-block default"><nav class="quarto-page-breadcrumbs quarto-title-breadcrumbs d-none d-lg-block" aria-label="breadcrumb"><ol class="breadcrumb"><li class="breadcrumb-item"><a href="../tutorials/index.html">Tutorials</a></li><li class="breadcrumb-item"><a href="../tutorials/best_practice.html">FastHTML Best Practices</a></li></ol></nav> | |
| <div class="quarto-title"> | |
| <h1 class="title">FastHTML Best Practices</h1> | |
| </div> | |
| <div class="quarto-title-meta"> | |
| </div> | |
| </header> | |
| <p>FastHTML applications are different to applications using FastAPI/react, Django, etc. Don’t assume that FastHTML best practices are the same as those for other frameworks. Best practices embody the fast.ai philosophy: remove ceremony, leverage smart defaults, and write code that’s both concise and clear. The following are some particular opportunities that both humans and language models sometimes miss:</p> | |
| <section id="database-table-creation---use-dataclasses-and-idempotent-patterns" class="level2"> | |
| <h2 class="anchored" data-anchor-id="database-table-creation---use-dataclasses-and-idempotent-patterns">Database Table Creation - Use dataclasses and idempotent patterns</h2> | |
| <p><strong>Before:</strong></p> | |
| <div class="sourceCode" id="cb1"><pre class="sourceCode python code-with-copy"><code class="sourceCode python"><span id="cb1-1"><a href="#cb1-1" aria-hidden="true" tabindex="-1"></a>todos <span class="op">=</span> db.t.todos</span> | |
| <span id="cb1-2"><a href="#cb1-2" aria-hidden="true" tabindex="-1"></a><span class="cf">if</span> <span class="kw">not</span> todos.exists():</span> | |
| <span id="cb1-3"><a href="#cb1-3" aria-hidden="true" tabindex="-1"></a>todos.create(<span class="bu">id</span><span class="op">=</span><span class="bu">int</span>, task<span class="op">=</span><span class="bu">str</span>, completed<span class="op">=</span><span class="bu">bool</span>, created<span class="op">=</span><span class="bu">str</span>, pk<span class="op">=</span><span class="st">'id'</span>)</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div> | |
| <p><strong>After:</strong></p> | |
| <div class="sourceCode" id="cb2"><pre class="sourceCode python code-with-copy"><code class="sourceCode python"><span id="cb2-1"><a href="#cb2-1" aria-hidden="true" tabindex="-1"></a><span class="kw">class</span> Todo: <span class="bu">id</span>:<span class="bu">int</span><span class="op">;</span> task:<span class="bu">str</span><span class="op">;</span> completed:<span class="bu">bool</span><span class="op">;</span> created:<span class="bu">str</span></span> | |
| <span id="cb2-2"><a href="#cb2-2" aria-hidden="true" tabindex="-1"></a>todos <span class="op">=</span> db.create(Todo)</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div> | |
| <p>FastLite’s <code>create()</code> is idempotent - it creates the table if needed and returns the table object either way. Using a dataclass-style definition is cleaner and more Pythonic. The <code>id</code> field is automatically the primary key.</p> | |
| </section> | |
| <section id="route-naming-conventions---let-function-names-define-routes" class="level2"> | |
| <h2 class="anchored" data-anchor-id="route-naming-conventions---let-function-names-define-routes">Route Naming Conventions - Let function names define routes</h2> | |
| <p><strong>Before:</strong></p> | |
| <div class="sourceCode" id="cb3"><pre class="sourceCode python code-with-copy"><code class="sourceCode python"><span id="cb3-1"><a href="#cb3-1" aria-hidden="true" tabindex="-1"></a><span class="at">@rt</span>(<span class="st">"/"</span>)</span> | |
| <span id="cb3-2"><a href="#cb3-2" aria-hidden="true" tabindex="-1"></a><span class="kw">def</span> get(): <span class="cf">return</span> Titled(<span class="st">"Todo List"</span>, ...)</span> | |
| <span id="cb3-3"><a href="#cb3-3" aria-hidden="true" tabindex="-1"></a></span> | |
| <span id="cb3-4"><a href="#cb3-4" aria-hidden="true" tabindex="-1"></a><span class="at">@rt</span>(<span class="st">"/add"</span>)</span> | |
| <span id="cb3-5"><a href="#cb3-5" aria-hidden="true" tabindex="-1"></a><span class="kw">def</span> post(task: <span class="bu">str</span>): ...</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div> | |
| <p><strong>After:</strong></p> | |
| <div class="sourceCode" id="cb4"><pre class="sourceCode python code-with-copy"><code class="sourceCode python"><span id="cb4-1"><a href="#cb4-1" aria-hidden="true" tabindex="-1"></a><span class="at">@rt</span></span> | |
| <span id="cb4-2"><a href="#cb4-2" aria-hidden="true" tabindex="-1"></a><span class="kw">def</span> index(): <span class="cf">return</span> Titled(<span class="st">"Todo List"</span>, ...) <span class="co"># Special name for "/"</span></span> | |
| <span id="cb4-3"><a href="#cb4-3" aria-hidden="true" tabindex="-1"></a><span class="at">@rt</span></span> | |
| <span id="cb4-4"><a href="#cb4-4" aria-hidden="true" tabindex="-1"></a><span class="kw">def</span> add(task: <span class="bu">str</span>): ... <span class="co"># Function name becomes route</span></span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div> | |
| <p>Use <code>@rt</code> without arguments and let the function name define the route. The special name <code>index</code> maps to <code>/</code>.</p> | |
| </section> | |
| <section id="query-parameters-over-path-parameters---cleaner-url-patterns" class="level2"> | |
| <h2 class="anchored" data-anchor-id="query-parameters-over-path-parameters---cleaner-url-patterns">Query Parameters over Path Parameters - Cleaner URL patterns</h2> | |
| <p><strong>Before:</strong></p> | |
| <div class="sourceCode" id="cb5"><pre class="sourceCode python code-with-copy"><code class="sourceCode python"><span id="cb5-1"><a href="#cb5-1" aria-hidden="true" tabindex="-1"></a><span class="at">@rt</span>(<span class="st">"/toggle/</span><span class="sc">{todo_id}</span><span class="st">"</span>)</span> | |
| <span id="cb5-2"><a href="#cb5-2" aria-hidden="true" tabindex="-1"></a><span class="kw">def</span> post(todo_id: <span class="bu">int</span>): ...</span> | |
| <span id="cb5-3"><a href="#cb5-3" aria-hidden="true" tabindex="-1"></a><span class="co"># URL: /toggle/123</span></span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div> | |
| <p><strong>After:</strong></p> | |
| <div class="sourceCode" id="cb6"><pre class="sourceCode python code-with-copy"><code class="sourceCode python"><span id="cb6-1"><a href="#cb6-1" aria-hidden="true" tabindex="-1"></a><span class="at">@rt</span></span> | |
| <span id="cb6-2"><a href="#cb6-2" aria-hidden="true" tabindex="-1"></a><span class="kw">def</span> toggle(<span class="bu">id</span>: <span class="bu">int</span>): ...</span> | |
| <span id="cb6-3"><a href="#cb6-3" aria-hidden="true" tabindex="-1"></a><span class="co"># URL: /toggle?id=123</span></span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div> | |
| <p>Query parameters are more idiomatic in FastHTML and avoid duplicating param names in the path.</p> | |
| </section> | |
| <section id="leverage-return-values---chain-operations-in-one-line" class="level2 page-columns page-full"> | |
| <h2 class="anchored" data-anchor-id="leverage-return-values---chain-operations-in-one-line">Leverage Return Values - Chain operations in one line</h2> | |
| <div class="column-body-outset"> | |
| <p><strong>Before:</strong></p> | |
| <div class="sourceCode" id="cb7"><pre class="sourceCode python code-with-copy"><code class="sourceCode python"><span id="cb7-1"><a href="#cb7-1" aria-hidden="true" tabindex="-1"></a><span class="at">@rt</span></span> | |
| <span id="cb7-2"><a href="#cb7-2" aria-hidden="true" tabindex="-1"></a><span class="kw">def</span> add(task: <span class="bu">str</span>):</span> | |
| <span id="cb7-3"><a href="#cb7-3" aria-hidden="true" tabindex="-1"></a> new_todo <span class="op">=</span> todos.insert(task<span class="op">=</span>task, completed<span class="op">=</span><span class="va">False</span>, created<span class="op">=</span>datetime.now().isoformat())</span> | |
| <span id="cb7-4"><a href="#cb7-4" aria-hidden="true" tabindex="-1"></a> <span class="cf">return</span> todo_item(todos[new_todo])</span> | |
| <span id="cb7-5"><a href="#cb7-5" aria-hidden="true" tabindex="-1"></a></span> | |
| <span id="cb7-6"><a href="#cb7-6" aria-hidden="true" tabindex="-1"></a><span class="at">@rt</span></span> | |
| <span id="cb7-7"><a href="#cb7-7" aria-hidden="true" tabindex="-1"></a><span class="kw">def</span> toggle(<span class="bu">id</span>: <span class="bu">int</span>):</span> | |
| <span id="cb7-8"><a href="#cb7-8" aria-hidden="true" tabindex="-1"></a> todo <span class="op">=</span> todos[<span class="bu">id</span>]</span> | |
| <span id="cb7-9"><a href="#cb7-9" aria-hidden="true" tabindex="-1"></a> todos.update(completed<span class="op">=</span><span class="kw">not</span> todo.completed, <span class="bu">id</span><span class="op">=</span><span class="bu">id</span>)</span> | |
| <span id="cb7-10"><a href="#cb7-10" aria-hidden="true" tabindex="-1"></a> <span class="cf">return</span> todo_item(todos[<span class="bu">id</span>])</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div> | |
| <p><strong>After:</strong></p> | |
| <div class="sourceCode" id="cb8"><pre class="sourceCode python code-with-copy"><code class="sourceCode python"><span id="cb8-1"><a href="#cb8-1" aria-hidden="true" tabindex="-1"></a><span class="at">@rt</span></span> | |
| <span id="cb8-2"><a href="#cb8-2" aria-hidden="true" tabindex="-1"></a><span class="kw">def</span> add(task: <span class="bu">str</span>):</span> | |
| <span id="cb8-3"><a href="#cb8-3" aria-hidden="true" tabindex="-1"></a> <span class="cf">return</span> todo_item(todos.insert(task<span class="op">=</span>task, completed<span class="op">=</span><span class="va">False</span>, created<span class="op">=</span>datetime.now().isoformat()))</span> | |
| <span id="cb8-4"><a href="#cb8-4" aria-hidden="true" tabindex="-1"></a></span> | |
| <span id="cb8-5"><a href="#cb8-5" aria-hidden="true" tabindex="-1"></a><span class="at">@rt</span></span> | |
| <span id="cb8-6"><a href="#cb8-6" aria-hidden="true" tabindex="-1"></a><span class="kw">def</span> toggle(<span class="bu">id</span>: <span class="bu">int</span>):</span> | |
| <span id="cb8-7"><a href="#cb8-7" aria-hidden="true" tabindex="-1"></a> <span class="cf">return</span> todo_item(todos.update(completed<span class="op">=</span><span class="kw">not</span> todos[<span class="bu">id</span>].completed, <span class="bu">id</span><span class="op">=</span><span class="bu">id</span>))</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div> | |
| <p>Both <code>insert()</code> and <code>update()</code> return the affected object, enabling functional chaining.</p> | |
| </div> | |
| </section> | |
| <section id="use-.to-for-url-generation---type-safe-route-references" class="level2"> | |
| <h2 class="anchored" data-anchor-id="use-.to-for-url-generation---type-safe-route-references">Use <code>.to()</code> for URL Generation - Type-safe route references</h2> | |
| <p><strong>Before:</strong></p> | |
| <div class="sourceCode" id="cb9"><pre class="sourceCode python code-with-copy"><code class="sourceCode python"><span id="cb9-1"><a href="#cb9-1" aria-hidden="true" tabindex="-1"></a>hx_post<span class="op">=</span><span class="ss">f"/toggle?id=</span><span class="sc">{</span>todo<span class="sc">.</span><span class="bu">id</span><span class="sc">}</span><span class="ss">"</span></span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div> | |
| <p><strong>After:</strong></p> | |
| <div class="sourceCode" id="cb10"><pre class="sourceCode python code-with-copy"><code class="sourceCode python"><span id="cb10-1"><a href="#cb10-1" aria-hidden="true" tabindex="-1"></a>hx_post<span class="op">=</span>toggle.to(<span class="bu">id</span><span class="op">=</span>todo.<span class="bu">id</span>)</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div> | |
| <p>The <code>.to()</code> method generates URLs with type safety and is refactoring-friendly.</p> | |
| </section> | |
| <section id="built-in-css-frameworks---picocss-comes-free-with-fast_app" class="level2"> | |
| <h2 class="anchored" data-anchor-id="built-in-css-frameworks---picocss-comes-free-with-fast_app">Built-in CSS Frameworks - PicoCSS comes free with fast_app()</h2> | |
| <p><strong>Before:</strong></p> | |
| <div class="sourceCode" id="cb11"><pre class="sourceCode python code-with-copy"><code class="sourceCode python"><span id="cb11-1"><a href="#cb11-1" aria-hidden="true" tabindex="-1"></a>style <span class="op">=</span> Style(<span class="st">"""</span></span> | |
| <span id="cb11-2"><a href="#cb11-2" aria-hidden="true" tabindex="-1"></a><span class="st">.todo-container { max-width: 600px; margin: 0 auto; padding: 20px; }</span></span> | |
| <span id="cb11-3"><a href="#cb11-3" aria-hidden="true" tabindex="-1"></a><span class="st">/* ... many more lines ... */</span></span> | |
| <span id="cb11-4"><a href="#cb11-4" aria-hidden="true" tabindex="-1"></a><span class="st">"""</span>)</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div> | |
| <p><strong>After:</strong></p> | |
| <div class="sourceCode" id="cb12"><pre class="sourceCode python code-with-copy"><code class="sourceCode python"><span id="cb12-1"><a href="#cb12-1" aria-hidden="true" tabindex="-1"></a><span class="co"># Just use semantic HTML - Pico styles it automatically</span></span> | |
| <span id="cb12-2"><a href="#cb12-2" aria-hidden="true" tabindex="-1"></a>Container(...), Article(...), Card(...), Group(...)</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div> | |
| <p><code>fast_app()</code> includes PicoCSS by default. Use semantic HTML elements that Pico styles automatically. Use MonsterUI (like shadcn, but for FastHTML) for more complex UI needs.</p> | |
| </section> | |
| <section id="smart-defaults---titled-creates-container-serve-handles-main" class="level2"> | |
| <h2 class="anchored" data-anchor-id="smart-defaults---titled-creates-container-serve-handles-main">Smart Defaults - Titled creates Container, serve() handles main</h2> | |
| <p><strong>Before:</strong></p> | |
| <div class="sourceCode" id="cb13"><pre class="sourceCode python code-with-copy"><code class="sourceCode python"><span id="cb13-1"><a href="#cb13-1" aria-hidden="true" tabindex="-1"></a><span class="cf">return</span> Titled(<span class="st">"Todo List"</span>, Container(...))</span> | |
| <span id="cb13-2"><a href="#cb13-2" aria-hidden="true" tabindex="-1"></a></span> | |
| <span id="cb13-3"><a href="#cb13-3" aria-hidden="true" tabindex="-1"></a><span class="cf">if</span> <span class="va">__name__</span> <span class="op">==</span> <span class="st">"__main__"</span>:</span> | |
| <span id="cb13-4"><a href="#cb13-4" aria-hidden="true" tabindex="-1"></a> serve()</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div> | |
| <p><strong>After:</strong></p> | |
| <div class="sourceCode" id="cb14"><pre class="sourceCode python code-with-copy"><code class="sourceCode python"><span id="cb14-1"><a href="#cb14-1" aria-hidden="true" tabindex="-1"></a><span class="cf">return</span> Titled(<span class="st">"Todo List"</span>, ...) <span class="co"># Container is automatic</span></span> | |
| <span id="cb14-2"><a href="#cb14-2" aria-hidden="true" tabindex="-1"></a></span> | |
| <span id="cb14-3"><a href="#cb14-3" aria-hidden="true" tabindex="-1"></a>serve() <span class="co"># No need for if __name__ guard</span></span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div> | |
| <p><code>Titled</code> already wraps content in a <code>Container</code>, and <code>serve()</code> handles the main check internally.</p> | |
| </section> | |
| <section id="fasthtml-handles-iterables---no-unpacking-needed-for-generators" class="level2"> | |
| <h2 class="anchored" data-anchor-id="fasthtml-handles-iterables---no-unpacking-needed-for-generators">FastHTML Handles Iterables - No unpacking needed for generators</h2> | |
| <p><strong>Before:</strong></p> | |
| <div class="sourceCode" id="cb15"><pre class="sourceCode python code-with-copy"><code class="sourceCode python"><span id="cb15-1"><a href="#cb15-1" aria-hidden="true" tabindex="-1"></a>Section(<span class="op">*</span>[todo_item(todo) <span class="cf">for</span> todo <span class="kw">in</span> all_todos], <span class="bu">id</span><span class="op">=</span><span class="st">"todo-list"</span>)</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div> | |
| <p><strong>After:</strong></p> | |
| <div class="sourceCode" id="cb16"><pre class="sourceCode python code-with-copy"><code class="sourceCode python"><span id="cb16-1"><a href="#cb16-1" aria-hidden="true" tabindex="-1"></a>Section(<span class="bu">map</span>(todo_item, all_todos), <span class="bu">id</span><span class="op">=</span><span class="st">"todo-list"</span>)</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div> | |
| <p>FastHTML components accept iterables directly - no need to unpack with <code>*</code>.</p> | |
| </section> | |
| <section id="functional-patterns---use-map-over-list-comprehensions" class="level2"> | |
| <h2 class="anchored" data-anchor-id="functional-patterns---use-map-over-list-comprehensions">Functional Patterns - Use map() over list comprehensions</h2> | |
| <p>List comprehensions are great, but <code>map()</code> is often cleaner for simple transformations, especially when combined with FastHTML’s iterable handling.</p> | |
| </section> | |
| <section id="minimal-code---remove-comments-and-unnecessary-returns" class="level2"> | |
| <h2 class="anchored" data-anchor-id="minimal-code---remove-comments-and-unnecessary-returns">Minimal Code - Remove comments and unnecessary returns</h2> | |
| <p><strong>Before:</strong></p> | |
| <div class="sourceCode" id="cb17"><pre class="sourceCode python code-with-copy"><code class="sourceCode python"><span id="cb17-1"><a href="#cb17-1" aria-hidden="true" tabindex="-1"></a><span class="at">@rt</span></span> | |
| <span id="cb17-2"><a href="#cb17-2" aria-hidden="true" tabindex="-1"></a><span class="kw">def</span> delete(<span class="bu">id</span>: <span class="bu">int</span>):</span> | |
| <span id="cb17-3"><a href="#cb17-3" aria-hidden="true" tabindex="-1"></a> <span class="co"># Delete from database</span></span> | |
| <span id="cb17-4"><a href="#cb17-4" aria-hidden="true" tabindex="-1"></a> todos.delete(<span class="bu">id</span>)</span> | |
| <span id="cb17-5"><a href="#cb17-5" aria-hidden="true" tabindex="-1"></a> <span class="co"># Return empty response</span></span> | |
| <span id="cb17-6"><a href="#cb17-6" aria-hidden="true" tabindex="-1"></a> <span class="cf">return</span> <span class="st">""</span></span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div> | |
| <p><strong>After:</strong></p> | |
| <div class="sourceCode" id="cb18"><pre class="sourceCode python code-with-copy"><code class="sourceCode python"><span id="cb18-1"><a href="#cb18-1" aria-hidden="true" tabindex="-1"></a><span class="at">@rt</span></span> | |
| <span id="cb18-2"><a href="#cb18-2" aria-hidden="true" tabindex="-1"></a><span class="kw">def</span> delete(<span class="bu">id</span>: <span class="bu">int</span>): todos.delete(<span class="bu">id</span>)</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div> | |
| <ul> | |
| <li>Skip comments when code is self-documenting</li> | |
| <li>Don’t return empty strings - <code>None</code> is returned by default</li> | |
| <li>Use a single line for a single idea.</li> | |
| </ul> | |
| </section> | |
| <section id="use-post-for-all-mutations" class="level2"> | |
| <h2 class="anchored" data-anchor-id="use-post-for-all-mutations">Use POST for All Mutations</h2> | |
| <p><strong>Before:</strong></p> | |
| <div class="sourceCode" id="cb19"><pre class="sourceCode python code-with-copy"><code class="sourceCode python"><span id="cb19-1"><a href="#cb19-1" aria-hidden="true" tabindex="-1"></a>hx_delete<span class="op">=</span><span class="ss">f"/delete?id=</span><span class="sc">{</span>todo<span class="sc">.</span><span class="bu">id</span><span class="sc">}</span><span class="ss">"</span></span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div> | |
| <p><strong>After:</strong></p> | |
| <div class="sourceCode" id="cb20"><pre class="sourceCode python code-with-copy"><code class="sourceCode python"><span id="cb20-1"><a href="#cb20-1" aria-hidden="true" tabindex="-1"></a>hx_post<span class="op">=</span>delete.to(<span class="bu">id</span><span class="op">=</span>todo.<span class="bu">id</span>)</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div> | |
| <p>FastHTML routes handle only GET and POST by default. Using only these two verbs is more idiomatic and simpler.</p> | |
| </section> | |
| <section id="modern-htmx-event-syntax" class="level2"> | |
| <h2 class="anchored" data-anchor-id="modern-htmx-event-syntax">Modern HTMX Event Syntax</h2> | |
| <p><strong>Before:</strong></p> | |
| <div class="sourceCode" id="cb21"><pre class="sourceCode python code-with-copy"><code class="sourceCode python"><span id="cb21-1"><a href="#cb21-1" aria-hidden="true" tabindex="-1"></a>hx_on<span class="op">=</span><span class="st">"htmx:afterRequest: this.reset()"</span></span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div> | |
| <p><strong>After:</strong></p> | |
| <div class="sourceCode" id="cb22"><pre class="sourceCode python code-with-copy"><code class="sourceCode python"><span id="cb22-1"><a href="#cb22-1" aria-hidden="true" tabindex="-1"></a>hx_on__after_request<span class="op">=</span><span class="st">"this.reset()"</span></span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div> | |
| <p>This works because:</p> | |
| <ul> | |
| <li><code>hx-on="event: code"</code> is deprecated; <code>hx-on-event="code"</code> is preferred</li> | |
| <li>FastHTML converts <code>_</code> to <code>-</code> (so <code>hx_on__after_request</code> becomes <code>hx-on--after-request</code>)</li> | |
| <li><code>::</code> in HTMX can be used as a shortcut for <code>:htmx:</code>.</li> | |
| <li>HTMX natively accepts <code>-</code> instead of <code>:</code> (so <code>-htmx-</code> works like <code>:htmx:</code>)</li> | |
| <li>HTMX accepts e.g <code>after-request</code> as an alternative to camelCase <code>afterRequest</code></li> | |
| </ul> | |
| </section> | |
| </main> <!-- /main --> | |
| <script id="quarto-html-after-body" type="application/javascript"> | |
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| button.classList.add('code-copy-button-checked'); | |
| var currentTitle = button.getAttribute("title"); | |
| button.setAttribute("title", "Copied!"); | |
| let tooltip; | |
| if (window.bootstrap) { | |
| button.setAttribute("data-bs-toggle", "tooltip"); | |
| button.setAttribute("data-bs-placement", "left"); | |
| button.setAttribute("data-bs-title", "Copied!"); | |
| tooltip = new bootstrap.Tooltip(button, | |
| { trigger: "manual", | |
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| tooltip.hide(); | |
| button.removeAttribute("data-bs-title"); | |
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| } | |
| button.setAttribute("title", currentTitle); | |
| button.classList.remove('code-copy-button-checked'); | |
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| const clipboardModal = new window.ClipboardJS('.code-copy-button[data-in-quarto-modal]', { | |
| text: getTextToCopy, | |
| container: window.document.getElementById('quarto-embedded-source-code-modal') | |
| }); | |
| clipboardModal.on('success', onCopySuccess); | |
| } | |
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| // undo the damage that might have been done by quarto-nav.js in the case of | |
| // links that we want to consider external | |
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| const cites = parentEl.dataset.cites; | |
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| cites: cites.split(' ') | |
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| }); | |
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| </div> <!-- /content --> | |
| <footer class="footer"><div class="nav-footer"><div class="nav-footer-center"><div class="toc-actions d-sm-block d-md-none"><ul><li><a href="https://github.com/AnswerDotAI/fasthtml/issues/new" class="toc-action"><i class="bi bi-github"></i>Report an issue</a></li></ul></div></div></div></footer></body></html> |