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| author | Bradley Taunt <bt@btxx.org> | 2024-06-06 08:05:12 -0400 |
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| committer | Bradley Taunt <bt@btxx.org> | 2024-06-06 08:05:12 -0400 |
| commit | 6b742c459266b18e2b375b35205ce8a6c02f0452 (patch) | |
| tree | b16fbb9a045e33dd6c97eb5ab72e6ff4d9237ea3 /build/obvious-js-injection-fallback/index.html | |
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diff --git a/build/obvious-js-injection-fallback/index.html b/build/obvious-js-injection-fallback/index.html new file mode 100644 index 0000000..79fb611 --- /dev/null +++ b/build/obvious-js-injection-fallback/index.html @@ -0,0 +1,64 @@ +<!doctype html> +<html lang="en" id="top"> +<head> + <meta charset="utf-8"> + <meta name="viewport" content="width=device-width, initial-scale=1"> + <link rel="icon" href="data:,"> + <title>Obvious Javascript 'Injection' Fallback</title> + <link href="https://bt.ht/atom.xml" type="application/atom+xml" rel="alternate" title="Atom feed for blog posts" /> + <style>*{box-sizing:border-box;}body{font-family:sans-serif;margin:0 auto;max-width:650px;padding:1rem;}img{max-width:100%;}pre{overflow:auto;}table{text-align:left;width:100%;}</style> +</head> + +<nav> + <a href="#menu">Menu ↓</a> +</nav> + +<main> +<h1>Obvious Javascript 'Injection' Fallback</h1> +<p>2020-12-04</p> +<p>Sometimes websites and web apps might require content to be "injected" via Javascript. I should mention that I am strongly against this practice - but often this kind of thing is out of one's hands. So, the least I can do is setup these "injections" to have proper fallbacks for users who disable JS. You would be surprised how many developers build <em>empty</em> HTML elements with the assumption they will be filled via Javascript.</p> +<h2>Our Hypothetical Project</h2> +<p>Let's pretend that we have a total tally that pulls in the number of current users using our fake SaaS app. We would do something like this:</p> +<h3>HTML</h3> +<p>Here we create an empty <code>h2</code> tag that will update with the current number of users via js:</p> +<pre><code><main> + <h2 class="total-tally"></h2> +</main> +</code></pre> +<h3>Javascript</h3> +<p>You'll have to use your imagination here and assume that the <code>totalTally</code> variable pulls in the numbers dynamically via API:</p> +<pre><code>var totalTally = "273,677" /* This would pull something dynamically in prod */ +document.getElementsByClassName("total-tally")[0].innerHTML=totalTally; +</code></pre> +<h2>The Problem</h2> +<p>The big issue we have now occurs when a user visits this page without JS enabled. The <code>h2</code> tag will remain empty and they won't see anything. I know this seems like a very avoidable issue, but you would be surprised how often it actually happens on the web.</p> +<h2>The (overly simple) Solution</h2> +<p>The easiest way to avoid these types of empty tags - add static content. I know - mind blowing, right?</p> +<h3>HTML (updated)</h3> +<pre><code><main> + <h2 class="total-tally">200,000+</h2> +</main> +</code></pre> +<p>You might be reading this and saying to yourself, "Wow! Thanks Captain Obvious!" and that's a fair reaction. This is an <em>obvious</em> demo on purpose. If even one single reader learns to avoid leaving empty HTML tags that are solely dependent on Javascript injection, then I'd say this demo was a huge success.</p> +<p>Rule of thumb: don't make assumption about your users. Play it safe.</p> +<footer role="contentinfo"> + <h2>Menu Navigation</h2> + <ul id="menu"> + <li><a href="/">Home</a></li> + <li><a href="/projects">Projects</a></li> + <li><a href="/uses">Uses</a></li> + <li><a href="/wiki">Wiki</a></li> + <li><a href="/resume">Resume</a></li> + <li><a href="/colophon">Colophon</a></li> + <li><a href="/now">Now</a></li> + <li><a href="/donate">Donate</a></li> + <li><a href="/atom.xml">RSS</a></li> + <li><a href="#top">↑ Top of the page</a></li> + </ul> + <small> + Built with <a href="https://git.sr.ht/~bt/barf">barf</a>. <br> + Maintained with ♥ for the web. <br> + Proud supporter of <a href="https://usefathom.com/ref/DKHJVX">Fathom</a> & <a href="https://nextdns.io/?from=74d3p3h8">NextDNS</a>. <br> + The content for this site is <a href="https://creativecommons.org/licenses/by-sa/2.0/">CC-BY-SA</a>.<br> The <a href="https://git.sr.ht/~bt/bt.ht">code for this site</a> is <a href="https://git.sr.ht/~bt/bt.ht/tree/master/item/LICENSE">MIT</a>. + </small> +</footer>
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