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<title>PlausibleWeb.Live.Components.Modal — Plausible v0.0.1</title>
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<h1>
<a href="https://github.com/plausible/analytics/blob/main/lib/plausible_web/live/components/modal.ex#L1" title="View Source" class="icon-action" rel="help">
<i class="ri-code-s-slash-line" aria-hidden="true"></i>
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<span translate="no">PlausibleWeb.Live.Components.Modal</span>
<small class="app-vsn" translate="no">(Plausible v0.0.1)</small>
</h1>
<section id="moduledoc">
<p>LiveView implementation of modal component.</p><p>This component is a general purpose modal implementation for LiveView
with emphasis on keeping nested components largely agnostic of the fact
that they are placed in a modal and maintaining good user experience
on connections with high latency.</p><h2 id="module-usage" class="section-heading">
<a href="#module-usage" class="hover-link">
<i class="ri-link-m" aria-hidden="true"></i>
</a>
<span class="text">Usage</span>
</h2>
<p>An example use case for a modal is embedding a form inside
existing live view which allows adding new entries of some kind:</p><pre><code class="makeup elixir" translate="no"><span class="o">&lt;</span><span class="o">.</span><span class="n">live_component</span><span class="w"> </span><span class="n">module</span><span class="o">=</span><span class="p" data-group-id="7723238965-1">{</span><span class="nc">Modal</span><span class="p" data-group-id="7723238965-1">}</span><span class="w"> </span><span class="n">id</span><span class="o">=</span><span class="s">&quot;some-form-modal&quot;</span><span class="w"> </span><span class="ss">:let</span><span class="o">=</span><span class="p" data-group-id="7723238965-2">{</span><span class="n">modal_unique_id</span><span class="p" data-group-id="7723238965-2">}</span><span class="o">&gt;</span><span class="w">
</span><span class="o">&lt;</span><span class="o">.</span><span class="n">live_component</span><span class="w">
</span><span class="n">module</span><span class="o">=</span><span class="p" data-group-id="7723238965-3">{</span><span class="nc">SomeForm</span><span class="p" data-group-id="7723238965-3">}</span><span class="w">
</span><span class="n">id</span><span class="o">=</span><span class="p" data-group-id="7723238965-4">{</span><span class="s">&quot;some-form-</span><span class="si" data-group-id="7723238965-5">#{</span><span class="n">modal_unique_id</span><span class="si" data-group-id="7723238965-5">}</span><span class="s">&quot;</span><span class="p" data-group-id="7723238965-4">}</span><span class="w">
</span><span class="n">on_save_form</span><span class="o">=</span><span class="p" data-group-id="7723238965-6">{</span><span class="w">
</span><span class="k" data-group-id="7723238965-7">fn</span><span class="w"> </span><span class="n">entry</span><span class="p">,</span><span class="w"> </span><span class="n">socket</span><span class="w"> </span><span class="o">-&gt;</span><span class="w">
</span><span class="n">send</span><span class="p" data-group-id="7723238965-8">(</span><span class="n">self</span><span class="p" data-group-id="7723238965-9">(</span><span class="p" data-group-id="7723238965-9">)</span><span class="p">,</span><span class="w"> </span><span class="p" data-group-id="7723238965-10">{</span><span class="ss">:entry_added</span><span class="p">,</span><span class="w"> </span><span class="n">entry</span><span class="p" data-group-id="7723238965-10">}</span><span class="p" data-group-id="7723238965-8">)</span><span class="w">
</span><span class="nc">Modal</span><span class="o">.</span><span class="n">close</span><span class="p" data-group-id="7723238965-11">(</span><span class="n">socket</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;some-form-modal&quot;</span><span class="p" data-group-id="7723238965-11">)</span><span class="w">
</span><span class="k" data-group-id="7723238965-7">end</span><span class="w">
</span><span class="p" data-group-id="7723238965-6">}</span><span class="w">
</span><span class="o">/</span><span class="o">&gt;</span><span class="w">
</span><span class="o">&lt;</span><span class="o">/</span><span class="o">.</span><span class="n">live_component</span><span class="o">&gt;</span></code></pre><p>Then somewhere in the same live view the modal is rendered in:</p><pre><code class="makeup elixir" translate="no"><span class="o">&lt;</span><span class="o">.</span><span class="n">button</span><span class="w"> </span><span class="n">x</span><span class="o">-</span><span class="n">data</span><span class="w"> </span><span class="n">x</span><span class="o">-</span><span class="n">on</span><span class="ss">:click</span><span class="o">=</span><span class="p" data-group-id="6616728442-1">{</span><span class="nc">Modal.JS</span><span class="o">.</span><span class="n">open</span><span class="p" data-group-id="6616728442-2">(</span><span class="s">&quot;goals-form-modal&quot;</span><span class="p" data-group-id="6616728442-2">)</span><span class="p" data-group-id="6616728442-1">}</span><span class="o">&gt;</span><span class="w">
</span><span class="o">+</span><span class="w"> </span><span class="nc">Add</span><span class="w"> </span><span class="nc">Entry</span><span class="w">
</span><span class="o">&lt;</span><span class="o">/</span><span class="o">.</span><span class="n">button</span><span class="o">&gt;</span></code></pre><h2 id="module-explanation" class="section-heading">
<a href="#module-explanation" class="hover-link">
<i class="ri-link-m" aria-hidden="true"></i>
</a>
<span class="text">Explanation</span>
</h2>
<p>The component embedded inside the modal is always rendered when
the live view is mounted but is kept hidden until <code class="inline">Modal.JS.open</code>
is called on it. On subsequent openings within the same session
the contents of the modal are completely remounted. This assures
that any stateful components inside the modal are reset to their
initial state. The modal component provides <code class="inline">modal_unique_id</code>
as an argument to its inner block. Appending this ID to every
live components' ID nested inside the modal is important for
consistent state reset on every reopening. This also applies
to live components nested inside live components embedded directly
in the modal's inner block - then the unique ID should be also
passed down as an attribute and appended accordingly. Appending can
be skipped if embedded component handles state reset explicitly
(via, for instance, <code class="inline">phx-click-away</code> callback).</p><p><code class="inline">Modal</code> exposes two functions for managing window state:</p><ul><li><p><code class="inline">Modal.JS.open/1</code> - to open the modal from the frontend. It's
important to make sure the element triggering that call is
wrapped in an Alpine UI component - or is an Alpine component
itself - adding <code class="inline">x-data</code> attribute without any value is enough
to ensure that.</p></li><li><p><code class="inline">Modal.close/2</code> - to close the modal from the backend; usually
done inside wrapped component's <code class="inline">handle_event/2</code>. The example
quoted above shows one way to implement this, under that assumption
that the component exposes a callback, like this:</p><pre><code class="makeup elixir" translate="no"><span class="kd">defmodule</span><span class="w"> </span><span class="nc">SomeForm</span><span class="w"> </span><span class="k" data-group-id="2334872959-1">do</span><span class="w">
</span><span class="kn">use</span><span class="w"> </span><span class="nc">Phoenix.LiveComponent</span><span class="w">
</span><span class="kd">def</span><span class="w"> </span><span class="nf">update</span><span class="p" data-group-id="2334872959-2">(</span><span class="n">assigns</span><span class="p">,</span><span class="w"> </span><span class="n">socket</span><span class="p" data-group-id="2334872959-2">)</span><span class="w"> </span><span class="k" data-group-id="2334872959-3">do</span><span class="w">
</span><span class="c1"># ...</span><span class="w">
</span><span class="p" data-group-id="2334872959-4">{</span><span class="ss">:ok</span><span class="p">,</span><span class="w"> </span><span class="n">assign</span><span class="p" data-group-id="2334872959-5">(</span><span class="n">socket</span><span class="p">,</span><span class="w"> </span><span class="ss">:on_save_form</span><span class="p">,</span><span class="w"> </span><span class="n">assigns</span><span class="o">.</span><span class="n">on_save_form</span><span class="p" data-group-id="2334872959-5">)</span><span class="p" data-group-id="2334872959-4">}</span><span class="w">
</span><span class="k" data-group-id="2334872959-3">end</span><span class="w">
</span><span class="c1">#...</span><span class="w">
</span><span class="kd">def</span><span class="w"> </span><span class="nf">handle_event</span><span class="p" data-group-id="2334872959-6">(</span><span class="s">&quot;save-form&quot;</span><span class="p">,</span><span class="w"> </span><span class="p" data-group-id="2334872959-7">%{</span><span class="s">&quot;form&quot;</span><span class="w"> </span><span class="p">=&gt;</span><span class="w"> </span><span class="n">form</span><span class="p" data-group-id="2334872959-7">}</span><span class="p">,</span><span class="w"> </span><span class="n">socket</span><span class="p" data-group-id="2334872959-6">)</span><span class="w"> </span><span class="k" data-group-id="2334872959-8">do</span><span class="w">
</span><span class="k">case</span><span class="w"> </span><span class="n">save_entry</span><span class="p" data-group-id="2334872959-9">(</span><span class="n">form</span><span class="p" data-group-id="2334872959-9">)</span><span class="w"> </span><span class="k" data-group-id="2334872959-10">do</span><span class="w">
</span><span class="p" data-group-id="2334872959-11">{</span><span class="ss">:ok</span><span class="p">,</span><span class="w"> </span><span class="n">entry</span><span class="p" data-group-id="2334872959-11">}</span><span class="w"> </span><span class="o">-&gt;</span><span class="w">
</span><span class="p" data-group-id="2334872959-12">{</span><span class="ss">:noreply</span><span class="p">,</span><span class="w"> </span><span class="n">socket</span><span class="o">.</span><span class="n">assigns</span><span class="o">.</span><span class="n">on_save_form</span><span class="p" data-group-id="2334872959-13">(</span><span class="n">entry</span><span class="p">,</span><span class="w"> </span><span class="n">socket</span><span class="p" data-group-id="2334872959-13">)</span><span class="p" data-group-id="2334872959-12">}</span><span class="w">
</span><span class="c1"># error case handling ...</span><span class="w">
</span><span class="k" data-group-id="2334872959-10">end</span><span class="w">
</span><span class="k" data-group-id="2334872959-8">end</span><span class="w">
</span><span class="k" data-group-id="2334872959-1">end</span></code></pre><p>Using callback approach has an added benefit of making the
component more flexible.</p></li></ul>
</section>
<section id="summary" class="details-list">
<h1 class="section-heading">
<a class="hover-link" href="#summary">
<i class="ri-link-m" aria-hidden="true"></i>
</a>
<span class="text">Summary</span>
</h1>
<div class="summary-functions summary">
<h2>
<a href="#functions">Functions</a>
</h2>
<div class="summary-row">
<div class="summary-signature">
<a href="#close/2" translate="no">close(socket, id)</a>
</div>
</div>
<div class="summary-row">
<div class="summary-signature">
<a href="#render/1" translate="no">render(assigns)</a>
</div>
<div class="summary-synopsis"><h2>Attributes</h2><ul><li><code class="inline">id</code> (<code class="inline">:any</code>) (required)</li><li><code class="inline">class</code> (<code class="inline">:string</code>) - Defaults to <code class="inline">&quot;&quot;</code>.</li></ul><h2>Slots</h2><ul><li><code class="inline">inner_block</code> (required)</li></ul></div>
</div>
</div>
</section>
<section id="functions" class="details-list">
<h1 class="section-heading">
<a class="hover-link" href="#functions">
<i class="ri-link-m" aria-hidden="true"></i>
</a>
<span class="text">Functions</span>
</h1>
<div class="functions-list">
<section class="detail" id="close/2">
<div class="detail-header">
<a href="#close/2" class="detail-link" title="Link to this function">
<i class="ri-link-m" aria-hidden="true"></i>
<span class="sr-only">Link to this function</span>
</a>
<h1 class="signature" translate="no">close(socket, id)</h1>
<a href="https://github.com/plausible/analytics/blob/main/lib/plausible_web/live/components/modal.ex#L110" class="icon-action" rel="help" title="View Source">
<i class="ri-code-s-slash-line" aria-hidden="true"></i>
<span class="sr-only">View Source</span>
</a>
</div>
<section class="docstring">
<div class="specs">
<pre translate="no"><span class="attribute">@spec</span> close(<a href="https://hexdocs.pm/phoenix_live_view/0.20.3/Phoenix.LiveView.Socket.html#t:t/0">Phoenix.LiveView.Socket.t</a>(), <a href="https://hexdocs.pm/elixir/String.html#t:t/0">String.t</a>()) :: <a href="https://hexdocs.pm/phoenix_live_view/0.20.3/Phoenix.LiveView.Socket.html#t:t/0">Phoenix.LiveView.Socket.t</a>()</pre>
</div>
</section>
</section>
<section class="detail" id="render/1">
<div class="detail-header">
<a href="#render/1" class="detail-link" title="Link to this function">
<i class="ri-link-m" aria-hidden="true"></i>
<span class="sr-only">Link to this function</span>
</a>
<h1 class="signature" translate="no">render(assigns)</h1>
<a href="https://github.com/plausible/analytics/blob/main/lib/plausible_web/live/components/modal.ex#L136" class="icon-action" rel="help" title="View Source">
<i class="ri-code-s-slash-line" aria-hidden="true"></i>
<span class="sr-only">View Source</span>
</a>
</div>
<section class="docstring">
<h2 id="render/1-attributes" class="section-heading">
<a href="#render/1-attributes" class="hover-link">
<i class="ri-link-m" aria-hidden="true"></i>
</a>
<span class="text">Attributes</span>
</h2>
<ul><li><code class="inline">id</code> (<code class="inline">:any</code>) (required)</li><li><code class="inline">class</code> (<code class="inline">:string</code>) - Defaults to <code class="inline">&quot;&quot;</code>.</li></ul><h2 id="render/1-slots" class="section-heading">
<a href="#render/1-slots" class="hover-link">
<i class="ri-link-m" aria-hidden="true"></i>
</a>
<span class="text">Slots</span>
</h2>
<ul><li><code class="inline">inner_block</code> (required)</li></ul>
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