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<!doctype html>
<html class="default no-js">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<title>Replicache</title>
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<a href="globals.html">Globals</a>
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<h1>Replicache</h1>
</div>
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<div class="container container-main">
<div class="row">
<div class="col-8 col-content">
<div class="tsd-panel tsd-typography">
<a href="#replicache-js-sdk&qu
8000
ot; id="replicache-js-sdk" style="color: inherit; text-decoration: none;">
<h1>Replicache JS SDK</h1>
</a>
<a href="#offline-first-for-every-application" id="offline-first-for-every-application" style="color: inherit; text-decoration: none;">
<h3>Offline-First for Every Application</h3>
</a>
<p><img src="https://github.com/rocicorp/replicache-sdk-js/workflows/Node.js%20CI/badge.svg" alt="Node.js CI"></p>
<a href="#👋-quickstart" id="👋-quickstart" style="color: inherit; text-decoration: none;">
<h2>👋 Quickstart</h2>
</a>
<p>This tutorial walks through creating a basic offline-first todo app with <a href="https://replicache.dev/">Replicache</a>. If you have any problems or questions, please <a href="https://join.slack.com/t/rocicorp/shared_invite/zt-h8ygwu8j-RVniv5XsBps0Q9oJXdMyoA">join us on Slack</a>. We'd be happy to help.</p>
<p>You can also skip to the end and <a href="https://github.com/rocicorp/replicache-sdk-js/tree/master/sample/cal">check out the full working version of this sample</a>.</p>
<p><strong>Note:</strong> This document assumes you already know what Replicache is, why you might need it, and broadly how it works. If that's not true check out the <a href="https://github.com/rocicorp/replicache/blob/master/design.md">design document</a> for a detailed deep-dive.</p>
<a href="#🏃♂️-install" id="🏃♂️-install" style="color: inherit; text-decoration: none;">
<h2>🏃♂️ Install</h2>
</a>
<pre><code>npm <span class="hljs-keyword">install</span> replicache</code></pre>
<a href="#🚴🏿♀️-instantiate" id="🚴🏿♀️-instantiate" style="color: inherit; text-decoration: none;">
<h2>🚴🏿♀️ Instantiate</h2>
</a>
<p>Replicache ships with both ES6 and CommonJS modules. For simplicity, these examples use ES6.</p>
<pre><code class="language-html"><span class="hljs-tag"><<span class="hljs-name">script</span> <span class="hljs-attr">type</span>=<span class="hljs-string">"module"</span>></span><span class="javascript">
<span class="hljs-keyword">import</span> Replicache <span class="hljs-keyword">from</span> <span class="hljs-string">'./node_modules/replicache/out/mod.js'</span>;
<span class="hljs-keyword">var</span> rep = <span class="hljs-keyword">new</span> Replicache({
<span class="hljs-comment">// URL of the diff server to use. The diff server periodically fetches</span>
<span class="hljs-comment">// the "client view" from your service and forwards any delta to the</span>
<span class="hljs-comment">// client. You can use our hosted diff server (as here) or a local diff</span>
<span class="hljs-comment">// server, which is useful during development. See</span>
<span class="hljs-comment">// https://github.com/rocicorp/replicache#server-side for more</span>
<span class="hljs-comment">// information on setting up your client view.</span>
<span class="hljs-attr">diffServerURL</span>: <span class="hljs-string">'https://serve.replicache.dev/pull'</span>,
<span class="hljs-comment">// Auth token for the diff server, if any.</span>
<span class="hljs-attr">diffServerAuth</span>: <span class="hljs-string">'1'</span>,
<span class="hljs-comment">// URL of your service's Replicache batch endpoint. Replicache</span>
<span class="hljs-comment">// will send batches of mutations here for application.</span>
<span class="hljs-attr">batchURL</span>: <span class="hljs-string">'https://replicache-sample-todo.now.sh/serve/replicache-batch'</span>,
<span class="hljs-comment">// Auth token for your client view and batch endpoints, if any.</span>
<span class="hljs-attr">dataLayerAuth</span>: <span class="hljs-string">'2'</span>,
});
</span><span class="hljs-tag"></<span class="hljs-name">script</span>></span></code></pre>
<a href="#🚗-render-ui" id="🚗-render-ui" style="color: inherit; text-decoration: none;">
<h2>🚗 Render UI</h2>
</a>
<p>Use <code>subscribe()</code> to open standing queries. Replicache fires <code>onData</code> whenever the result of the query changes, either because of local changes or sync.</p>
<pre><code class="language-js">rep.subscribe(
<span class="hljs-keyword">async</span> tx => {
<span class="hljs-keyword">return</span> <span class="hljs-keyword">await</span> toArray(tx.scan({<span class="hljs-attr">prefix</span>: <span class="hljs-string">'/todo/'</span>}));
},
{
<span class="hljs-attr">onData</span>: <span class="hljs-function"><span class="hljs-params">result</span> =></span> {
<span class="hljs-comment">// Using lit-html, but the principle is the same in any UI framework.</span>
<span class="hljs-comment">// See https://github.com/rocicorp/replicache-sdk-js/tree/master/sample/cal</span>
<span class="hljs-comment">// for an example using React.</span>
<span class="hljs-keyword">const</span> toggle = <span class="hljs-function"><span class="hljs-params">complete</span> =></span>
html`<span class="xml"><span class="hljs-tag"><<span class="hljs-name">td</span>></span><span class="hljs-tag"><<span class="hljs-name">input</span> <span class="hljs-attr">type</span>=<span class="hljs-string">"checkbox"</span> <span class="hljs-attr">.checked</span>=</span></span><span class="hljs-subst">${complete}</span><span class="xml"><span class="hljs-tag"> /></span><span class="hljs-tag"></<span class="hljs-name">td</span>></span>`</span>;
<span class="hljs-keyword">const</span> title = <span class="hljs-function"><span class="hljs-params">text</span> =></span> html`<span class="xml"><span class="hljs-tag"><<span class="hljs-name">td</span>></span></span><span class="hljs-subst">${text}</span><span class="xml"><span class="hljs-tag"></<span class="hljs-name">td</span>></span>`</span>;
<span class="hljs-keyword">const</span> row = <span class="hljs-function"><span class="hljs-params">todo</span> =></span>
html`<span class="xml"><span class="hljs-tag"><<span class="hljs-name">tr</span>></span>
</span><span class="hljs-subst">${toggle(todo.complete)}</span><span class="hljs-subst">${title(todo.text)}</span><span class="xml">
<span class="hljs-tag"></<span class="hljs-name">tr</span>></span>`</span>;
render(
html`<span class="xml"><span class="hljs-tag"><<span class="hljs-name">table</span>></span>
</span><span class="hljs-subst">${result.map(row)}</span><span class="xml">
<span class="hljs-tag"></<span class="hljs-name">table</span>></span>`</span>,
<span class="hljs-built_in">document</span>.body,
);
},
},
);</code></pre>
<a href="#🏎-mutate-data" id="🏎-mutate-data" style="color: inherit; text-decoration: none;">
<h2>🏎 Mutate Data</h2>
</a>
<p>Register client-side <em>mutators</em> using <code>register()</code>.</p>
<p>Mutators run completely locally, without waiting on the server — online, offline, whatever! A record of the mutation is queued and sent to your service's batch endpoint when possible.</p>
<p>Replicache also invokes mutators itself, during sync, to replay unacknowledged changes on top of newly received server state.</p>
<pre><code class="language-js"><span class="hljs-keyword">const</span> updateTodo = rep.register(<span class="hljs-string">'updateTodo'</span>, <span class="hljs-keyword">async</span> (tx, {id, complete}) => {
<span class="hljs-keyword">const</span> key = <span class="hljs-string">`/todo/<span class="hljs-subst">${id}</span>`</span>;
<span class="hljs-keyword">const</span> todo = <span class="hljs-keyword">await</span> tx.get(key);
todo.complete = complete;
<span class="hljs-keyword">await</span> tx.put(key, todo);
});
<span class="hljs-keyword">const</span> handleCheckbox = <span class="hljs-keyword">async</span> (id, e) => {
<span class="hljs-keyword">await</span> updateTodo({id, <span class="hljs-attr">complete</span>: e.srcElement.checked});
};</code></pre>
<a href="#🛫-tips" id="🛫-tips" style="color: inherit; text-decoration: none;">
<h2>🛫 Tips</h2>
</a>
<ul>
<li>We recommend <a href="https://stackoverflow.com/questions/5327955/how-to-make-google-chrome-javascript-console-persistent">enabling console persistence</a> while developing replicache-enabled apps to make debugging easier.</li>
</ul>
<a href="#🚀-next-steps" id="🚀-next-steps" style="color: inherit; text-decoration: none;">
<h2>🚀 Next Steps</h2>
</a>
<p>That's it! You've built a fully-functioning offline-first todo app against our sample backend. What will you do next?</p>
<ul>
<li><a href="https://github.com/rocicorp/replicache-sdk-js/tree/master/sample/lit-todo">Check out the full version of this sample</a></li>
<li><a href="https://github.com/rocicorp/replicache#server-side">Learn how to build your own backend integration</a></li>
<li><a href="https://github.com/rocicorp/replicache-sdk-js/tree/master/sample/cal">Check out the richer React/Babel/GCal sample</a></li>
<li><a href="https://replicache-sdk-js.now.sh/">Browse the full JS documentation</a></li>
</ul>
</div>
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