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								<aside class="quote no-group" data-username="cmo" data-post="21" data-topic="67622">
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<p>I believe they mean to keep the IDs the same between renders so you don’t go sending useless data each render.</p>
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<p>Yes, this is what I’m talking about.  There may be situations where it doesn’t matter but, for example, you can see it break change tracking if you assign a random id to a live component used to render each item of a list:</p>
<pre data-code-wrap="elixir"><code class="lang-elixir">~H"""
&lt;ul&gt;
  &lt;li :for={item &lt;- @items}&gt;
    &lt;.live_component item={item} id={"item#{System.unique_integer()}"} module={...} /&gt;
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</code></pre>
<p>EDIT: I also notice there are extra round trips made whenever using random ids, outside of a list or wherever, I’m not exactly sure what they are about.</p> 
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								<p>re: deterministic IDs.</p>
<p>People (<a class="mention" href="/u/sodapopcan" rel="nofollow">@sodapopcan</a> <a class="mention" href="/u/cmo" rel="nofollow">@cmo</a> <a class="mention" href="/u/adzz" rel="nofollow">@Adzz</a>) are correct to say that “random” HTML IDs are usually not a good idea.<br>
They do break change tracking when used carelessly. This can be especially bad when used with form inputs, since they lose focus when the ID changes.</p>
<p>As a “rule of thumb”, only use them when you have an element like this:</p>
<pre data-code-wrap="elixir"><code class="lang-elixir">&lt;div id={random_id()} phx-hook="MyHook" phx-update="ignore"&gt;
</code></pre> 
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								<p>Random IDs will also break client-side state. I tried using them as a convenience when using hooks, but as previously mentioned they will re-render on every change and the client side state will be lost as the hooks are identified via the id within LV.</p>
<p>Let’s say you a hook which has a hook with a display toggle functionality. The user interacts with it client-side and causes it to be hidden. If any other state in the same LiveView changes it will cause a re-render of the hook component with a new id. This will cause the hook to reset to it’s default state as it’s essentially a new hook instance.</p>
<p>Using random ids within LV is never a good idea imo. You can still use some module for generating ids, but it would need to always return the same id based on it’s arguments (aka pure function).</p> 
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								<p><a class="mention" href="/u/benlime" rel="nofollow">@benlime</a> Thank you!  I thought I was going crazy reading this thread.</p>
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<img alt="" width="24" height="24" src="https://forum.elixirforum.com/user_avatar/forum.elixirforum.com/slouchpie/48/34819_2.png" class="avatar"> slouchpie:</div>
<blockquote>
<p>As a “rule of thumb”, only use them when you have an element like this:</p>
<pre data-code-wrap="elixir"><code class="lang-elixir">&lt;div id={random_id()} phx-hook="MyHook" phx-update="ignore"&gt;
</code></pre>
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<p>TL;DR, only use them when by-passing LiveView <img src="https://forum.elixirforum.com/images/emoji/apple/wink.png?v=15" title=":wink:" class="emoji" alt=":wink:" loading="lazy" width="20" height="20"></p>
<p>I’m genuinely curious, though, what are the situations where you find yourself rendering a whole ton of <code>phx-update="ignore"</code>s where assigning a deterministic id is a huge pain-point?</p> 
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								<p>It’s never a huge pain point. I am just lazy.</p> 
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								<p>haha FAIR ENOUGH!</p> 
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