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<!DOCTYPE html><html lang="en-US"><head><meta charset="UTF-8"><meta name="viewport" content="width=device-width,height=device-height,initial-scale=1.0"><meta name="apple-mobile-web-app-capable" content="yes"><meta http-equiv="X-UA-Compatible" content="ie=edge"><meta property="og:type" content="website"><meta name="twitter:card" content="summary"><style>@media screen{body[data-bespoke-view=""] .bespoke-marp-parent>.bespoke-marp-osc>button,body[data-bespoke-view=next] .bespoke-marp-parent>.bespoke-marp-osc>button,body[data-bespoke-view=presenter] .bespoke-marp-presenter-container .bespoke-marp-presenter-info-container button,body[data-bespoke-view=presenter] .bespoke-marp-presenter-container .bespoke-marp-presenter-note-container button{-webkit-tap-highlight-color:transparent;-webkit-appearance:none;appearance:none;background-color:initial;border:0;color:inherit;cursor:pointer;font-size:inherit;opacity:.8;outline:none;padding:0;transition:opacity .2s linear}body[data-bespoke-view=""] .bespoke-marp-parent>.bespoke-marp-osc>button:disabled,body[data-bespoke-view=next] .bespoke-marp-parent>.bespoke-marp-osc>button:disabled,body[data-bespoke-view=presenter] .bespoke-marp-presenter-container .bespoke-marp-presenter-info-container button:disabled,body[data-bespoke-view=presenter] .bespoke-marp-presenter-container .bespoke-marp-presenter-note-container button:disabled{cursor:not-allowed;opacity:.15!important}body[data-bespoke-view=""] .bespoke-marp-parent>.bespoke-marp-osc>button:hover,body[data-bespoke-view=next] .bespoke-marp-parent>.bespoke-marp-osc>button:hover,body[data-bespoke-view=presenter] .bespoke-marp-presenter-container .bespoke-marp-presenter-info-container button:hover,body[data-bespoke-view=presenter] .bespoke-marp-presenter-container .bespoke-marp-presenter-note-container button:hover{opacity:1}body[data-bespoke-view=""] .bespoke-marp-parent>.bespoke-marp-osc>button:hover:active,body[data-bespoke-view=next] .bespoke-marp-parent>.bespoke-marp-osc>button:hover:active,body[data-bespoke-view=presenter] .bespoke-marp-presenter-container .bespoke-marp-presenter-info-container button:hover:active,body[data-bespoke-view=presenter] .bespoke-marp-presenter-container .bespoke-marp-presenter-note-container button:hover:active{opacity:.6}body[data-bespoke-view=""] .bespoke-marp-parent>.bespoke-marp-osc>button:hover:not(:disabled),body[data-bespoke-view=next] .bespoke-marp-parent>.bespoke-marp-osc>button:hover:not(:disabled),body[data-bespoke-view=presenter] .bespoke-marp-presenter-container .bespoke-marp-presenter-info-container button:hover:not(:disabled),body[data-bespoke-view=presenter] .bespoke-marp-presenter-container .bespoke-marp-presenter-note-container button:hover:not(:disabled){transition:none}body[data-bespoke-view=""] .bespoke-marp-parent>.bespoke-marp-osc>button[data-bespoke-marp-osc=prev],body[data-bespoke-view=next] .bespoke-marp-parent>.bespoke-marp-osc>button[data-bespoke-marp-osc=prev],body[data-bespoke-view=presenter] .bespoke-marp-presenter-container .bespoke-marp-presenter-info-container button.bespoke-marp-presenter-info-page-prev{background:#0000 url("data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHZpZXdCb3g9IjAgMCAxMDAgMTAwIj48cGF0aCBmaWxsPSJub25lIiBzdHJva2U9IiNmZmYiIHN0cm9rZS1saW5lY2FwPSJyb3VuZCIgc3Ryb2tlLWxpbmVqb2luPSJyb3VuZCIgc3Ryb2tlLXdpZHRoPSI1IiBkPSJNNjggOTAgMjggNTBsNDAtNDAiLz48L3N2Zz4=") no-repeat 50%;background-size:contain;overflow:hidden;text-indent:100%;white-space:nowrap}body[data-bespoke-view=""] .bespoke-marp-parent>.bespoke-marp-osc>button[data-bespoke-marp-osc=next],body[data-bespoke-view=next] .bespoke-marp-parent>.bespoke-marp-osc>button[data-bespoke-marp-osc=next],body[data-bespoke-view=presenter] .bespoke-marp-presenter-container .bespoke-marp-presenter-info-container button.bespoke-marp-presenter-info-page-next{background:#0000 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url("data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHZpZXdCb3g9IjAgMCAxMDAgMTAwIj48ZGVmcz48c3R5bGU+LmF7ZmlsbDpub25lO3N0cm9rZTojZmZmO3N0cm9rZS1saW5lY2FwOnJvdW5kO3N0cm9rZS1saW5lam9pbjpyb3VuZDtzdHJva2Utd2lkdGg6NXB4fTwvc3R5bGU+PC9kZWZzPjxyZWN0IHdpZHRoPSI4MCIgaGVpZ2h0PSI2MCIgeD0iMTAiIHk9IjIwIiBjbGFzcz0iYSIgcng9IjUuNjciLz48cGF0aCBkPSJNNDAgNzBIMjBWNTBtMjAgMEwyMCA3MG00MC00MGgyMHYyMG0tMjAgMCAyMC0yMCIgY2xhc3M9ImEiLz48L3N2Zz4=") no-repeat 50%;background-size:contain;overflow:hidden;text-indent:100%;white-space:nowrap}body[data-bespoke-view=""] .bespoke-marp-parent>.bespoke-marp-osc>button.exit[data-bespoke-marp-osc=fullscreen],body[data-bespoke-view=next] .bespoke-marp-parent>.bespoke-marp-osc>button.exit[data-bespoke-marp-osc=fullscreen]{background-image:url("data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHZpZXdCb3g9IjAgMCAxMDAgMTAwIj48ZGVmcz48c3R5bGU+LmF7ZmlsbDpub25lO3N0cm9rZTojZmZmO3N0cm9rZS1saW5lY2FwOnJvdW5kO3N0cm9rZS1saW5lam9pbjpyb3VuZDtzdHJva2Utd2lkdGg6NXB4fTwvc3R5bGU+PC9kZWZzPjxyZWN0IHdpZHRoPSI4MCIgaGVpZ2h0PSI2MCIgeD0iMTAiIHk9IjIwIiBjbGFzcz0iYSIgcng9IjUuNjciLz48cGF0aCBkPSJNMjAgNTBoMjB2MjBtLTIwIDAgMjAtMjBtNDAgMEg2MFYzMG0yMCAwTDYwIDUwIiBjbGFzcz0iYSIvPjwvc3ZnPg==")}body[data-bespoke-view=""] .bespoke-marp-parent>.bespoke-marp-osc>button[data-bespoke-marp-osc=presenter],body[data-bespoke-view=next] .bespoke-marp-parent>.bespoke-marp-osc>button[data-bespoke-marp-osc=presenter]{background:#0000 url("data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHZpZXdCb3g9IjAgMCAxMDAgMTAwIj48cGF0aCBmaWxsPSJub25lIiBzdHJva2U9IiNmZmYiIHN0cm9rZS1saW5lY2FwPSJyb3VuZCIgc3Ryb2tlLWxpbmVqb2luPSJyb3VuZCIgc3Ryb2tlLXdpZHRoPSI1IiBkPSJNODcuOCA0Ny41Qzg5IDUwIDg3LjcgNTIgODUgNTJIMzVhOC43IDguNyAwIDAgMS03LjItNC41bC0xNS42LTMxQzExIDE0IDEyLjIgMTIgMTUgMTJoNTBhOC44IDguOCAwIDAgMSA3LjIgNC41ek02MCA1MnYzNm0tMTAgMGgyME00NSA0MmgyMCIvPjwvc3ZnPg==") no-repeat 50%;background-size:contain;overflow:hidden;text-indent:100%;white-space:nowrap}body[data-bespoke-view=presenter] .bespoke-marp-presenter-container .bespoke-marp-presenter-note-container button.bespoke-marp-presenter-note-bigger{background:#0000 url("data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHZpZXdCb3g9IjAgMCAxMDAgMTAwIj48cGF0aCBzdHJva2U9IiNmZmYiIHN0cm9rZS1saW5lY2FwPSJyb3VuZCIgc3Ryb2tlLWxpbmVqb2luPSJyb3VuZCIgc3Ryb2tlLXdpZHRoPSI1IiBkPSJNMTIgNTBoODBNNTIgOTBWMTAiLz48L3N2Zz4=") no-repeat 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/*!
* Marp default theme.
*
* @theme default
* @author Yuki Hattori
*
* @auto-scaling true
* @size 16:9 1280px 720px
* @size 4:3 960px 720px
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tabindex="-1" title="Next slide">Next slide</button><button data-bespoke-marp-osc="fullscreen" tabindex="-1" title="Toggle fullscreen (f)">Toggle fullscreen</button><button data-bespoke-marp-osc="presenter" tabindex="-1" title="Open presenter view (p)">Open presenter view</button></div><div id=":$p"><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="1" data-style="
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<h1 id="extending-the-reach-of-elixir-with-livestate">Extending the reach of Elixir with LiveState</h1>
<p>Chris Nelson<br />
@superchris<br />
<img src="full-color.png#title-slide-logo" alt="" style="height:200px;" /></p>
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<h1 id="who-am-i">Who am I?</h1>
<ul>
<li>Long-time Elixirist</li>
<li>Co-Founder of Launch Scout</li>
<li>Creator of LiveState (and friends)</li>
<li>Apprenticeship enthusiast</li>
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<h1 id="livestate">LiveState</h1>
<h2 id="letting-you-use-elixir-when-your-app-isnt-served-by-elixir">Letting you <em>use</em> Elixir when your app isn't served <em>by</em> Elixir</h2>
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<h1 id="why-would-you-need-that">Why would you need that?</h1>
<ul>
<li>Embedded apps
<ul>
<li>Apps that live in your customers websites (Wordpress, Wix, etc)</li>
</ul>
</li>
<li>A <em>much</em> better DX than custom javascript, iframes, and APIs</li>
<li><strong>It's about expanding the reach of Elixir</strong></li>
</ul>
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<h1 id="but-first-what-do-i-really-love-about-liveview">But first: What do I <em>really</em> love about LiveView</h1>
<ul>
<li>The most important thing is not the template language</li>
<li>It's how simple it makes the front end</li>
</ul>
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<h1 id="how-does-liveview-keep-things-simple">How does LiveView keep things simple?</h1>
<ul>
<li>State lives on the server</li>
<li>LiveView code:
<ul>
<li>Renders state</li>
<li>Computes new state from events</li>
</ul>
</li>
</ul>
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<h1 id="what-if-we-could-use-this-pattern-in-more-places">What if we could use this pattern in more places?</h1>
<h2 id="could-we-keep-our-state-in-elixir-and-our-front-end-dead-simple">Could we keep our state in Elixir and our front-end dead simple?</h2>
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<h1 id="livestate-1">LiveState</h1>
<ul>
<li>A hex package containing a channel behaviour</li>
<li>A client side npm</li>
<li>mostly a wrapper around Phoenix Channels</li>
<li>sends events and receives state updates</li>
</ul>
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<h1 id="live_state"><code>live_state</code></h1>
<ul>
<li><code>use LiveState.Channel</code> behaviour in your channel</li>
<li>implement callbacks
<ul>
<li>init/3</li>
<li>handle_event/3</li>
<li>handle_message/3</li>
</ul>
</li>
</ul>
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<h1 id="phx-live-state"><code>phx-live-state</code></h1>
<ul>
<li>javascript (typescript) npm</li>
<li>increasing levels of abstraction:
<ul>
<li><code>LiveState</code> - lower level API</li>
<li><code>connectElement()</code> allows you to "wire up" a Custom Element</li>
<li><code>@liveState</code> TS decorator lets you declaratively annotate a Custom Element class</li>
</ul>
</li>
</ul>
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<h1 id="more-about-phx-live-state">More about <code>phx-live-state</code></h1>
<ul>
<li><a href="https://developer.mozilla.org/en-US/docs/Web/API/CustomEvent">Custom Events</a> are pushed to the channel</li>
<li>state changes are send as JSON patch
<ul>
<li>with a version to prevent out of order messaging issues</li>
</ul>
</li>
<li>elements can share a LiveState instance via the Context Protocol
<ul>
<li><code>provide</code> and <code>context</code> attributes of config</li>
</ul>
</li>
</ul>
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<h1 id="example-time-chat-room">Example time: <code><chat-room></code></h1>
<ul>
<li>The classic Phoenix example</li>
<li>now packages as a custom element (aka Web Component)</li>
</ul>
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<h1 id="an-aside-on-custom-elements">An aside on Custom Elements</h1>
<ul>
<li>Great way to add your app to your clients websites</li>
<li>Worpress, Wix, Squarespace, Drupal</li>
<li>Turns out they all support HTML!</li>
<li>And you can style it with good ole CSS!</li>
</ul>
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<h1 id="the-chat-channel">The chat channel</h1>
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-elixir"><span class="hljs-class"><span class="hljs-keyword">defmodule</span> <span class="hljs-title">ChatRoomWeb.ChatRoomChannel</span></span> <span class="hljs-keyword">do</span>
<span class="hljs-variable">@moduledoc</span> <span class="hljs-literal">false</span>
<span class="hljs-keyword">use</span> <span class="hljs-title class_">LiveState</span>.<span class="hljs-title class_">Channel</span>, <span class="hljs-symbol">web_module:</span> <span class="hljs-title class_">ChatRoomWeb</span>
<span class="hljs-keyword">alias</span> <span class="hljs-title class_">Phoenix</span>.<span class="hljs-title class_">PubSub</span>
<span class="hljs-variable">@impl</span> <span class="hljs-literal">true</span>
<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">init</span></span>(<span class="hljs-string">"chat_room:"</span> <> room, _params, _socket) <span class="hljs-keyword">do</span>
<span class="hljs-title class_">PubSub</span>.subscribe(<span class="hljs-title class_">ChatRoom</span>.<span class="hljs-title class_">PubSub</span>, <span class="hljs-string">"chat_messages:<span class="hljs-subst">#{room}</span>"</span>)
{<span class="hljs-symbol">:ok</span>, %{<span class="hljs-symbol">messages:</span> [], <span class="hljs-symbol">room:</span> room}}
<span class="hljs-keyword">end</span>
<span class="hljs-variable">@impl</span> <span class="hljs-literal">true</span>
<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">handle_event</span></span>(<span class="hljs-string">"send_message"</span>, message, %{<span class="hljs-symbol">room:</span> room} = state) <span class="hljs-keyword">do</span>
<span class="hljs-title class_">PubSub</span>.broadcast!(<span class="hljs-title class_">ChatRoom</span>.<span class="hljs-title class_">PubSub</span>, <span class="hljs-string">"chat_messages:<span class="hljs-subst">#{room}</span>"</span>, message)
{<span class="hljs-symbol">:noreply</span>, state}
<span class="hljs-keyword">end</span>
<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">handle_message</span></span>(message, %{<span class="hljs-symbol">messages:</span> messages} = state) <span class="hljs-keyword">do</span>
{<span class="hljs-symbol">:noreply</span>, state |> <span class="hljs-title class_">Map</span>.put(<span class="hljs-symbol">:messages</span>, [message | messages])}
<span class="hljs-keyword">end</span>
<span class="hljs-keyword">end</span>
</code></pre>
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<h1 id="chat-room"><code><chat-room></code></h1>
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-js"><span class="hljs-keyword">export</span> <span class="hljs-keyword">class</span> <span class="hljs-title class_">ChatRoomElement</span> <span class="hljs-keyword">extends</span> <span class="hljs-title class_ inherited__">LitElement</span> {
<span class="hljs-keyword">static</span> properties = {
<span class="hljs-attr">url</span>: {},
<span class="hljs-attr">room</span>: {},
<span class="hljs-attr">messages</span>: {
<span class="hljs-attr">type</span>: <span class="hljs-title class_">Array</span>,
<span class="hljs-attr">attribute</span>: <span class="hljs-literal">false</span>
}
}
<span class="hljs-title function_">connectedCallback</span>(<span class="hljs-params"></span>) {
<span class="hljs-variable language_">super</span>.<span class="hljs-title function_">connectedCallback</span>();
<span class="hljs-title function_">connectElement</span>(<span class="hljs-variable language_">this</span>, {
<span class="hljs-attr">url</span>: <span class="hljs-variable language_">this</span>.<span class="hljs-title function_">getAttribute</span>(<span class="hljs-string">'url'</span>),
<span class="hljs-attr">topic</span>: <span class="hljs-string">`chat_room:<span class="hljs-subst">${<span class="hljs-variable language_">this</span>.getAttribute(<span class="hljs-string">'room'</span>)}</span>`</span>,