73 lines
2.6 KiB
Markdown
73 lines
2.6 KiB
Markdown
+++
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title = "Fetch Injection"
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description = "Load external scripts and styles with incredible speed."
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categories = ["experience"]
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tags = ["performance", "styles"]
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features = ["snippets", "related content", "code highlighter"]
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[[copyright]]
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owner = "Josh Habdas"
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date = "2019"
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license = "agpl-3.0-or-later"
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+++
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After Dark uses the {{< external rel="external help" href="https://git.habd.as/jhabdas/fetch-inject" text="Fetch Inject" />}} library to load and execute external scripts and styles faster than browsers are capable of otherwise.
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{{< external href="https://hackcabin.com/post/managing-async-dependencies-javascript/" text="Fetch Injection" />}} was conceptualized and developed for After Dark to make it possible to deep-link to full-sized [Image Gallery](/module/hall-of-mirrors) images without blocking page load and has other performance applications:
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<table>
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<thead>
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<tr>
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<th rowspan="2" scope="col">Use Case</th>
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<th colspan="2" scope="col">Chrome Performance Comparison (4G simulated connection speed)</th>
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</tr>
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<tr>
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<th scope="col">Without Fetch Inject</th>
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<th scope="col">With Fetch Inject</th>
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</tr>
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</thead>
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<tbody>
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<td>{{< external href="https://habd.as/talks/screaming-fast-wordpress-redis-vultr/" text="WordPress Twenty Seventeen" />}}</td>
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<td>~3.600s</td>
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<td>~0.918s</td>
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</tbody>
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</table>
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Use Fetch Inject in your [Custom Layouts](../custom-layouts) to load scripts and styles cross-origin or from your site `static` directory.
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Given the following `static` folder contents:
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```
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├── layouts
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├── static
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│ ├── js
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│ │ ├── jquery.slim.min.js
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│ │ ├── tether.min.js
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│ │ └── bootstrap.min.js
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│ └── css
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│ └── font-awesome.min.css
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└── themes
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```
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You can load Bootstrap (w/Font Awesome) and show how long ago it finished:
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{{< highlight html "linenos=inline" >}}
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<script>
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fetchInject([
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'https://cdn.jsdelivr.net/lodash/latest/lodash.min.js',
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'https://cdn.jsdelivr.net/momentjs/latest/moment.min.js'
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])
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.then(() => {
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const start = moment();
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fetchInject(['/js/bootstrap.min.js'],
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fetchInject([
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'/js/jquery.slim.min.js',
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'/js/tether.min.js',
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'/css/font-awesome.min.css'
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])
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).then(console.log(`Bootstrap Loaded: ${_.capitalize(start.toNow())}.`));
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});
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</script>
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{{< /highlight >}}
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Fetch Inject is 555 bytes compressed, non-blocking and included by default in [Custom Layouts](../custom-layouts). Visit the {{< external href="https://codepen.io/jhabdas/pen/MpVeOE?editors=0012" text="CodePen Playground" />}} to try it out.
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