blob: 149dc4e461b4d066081133ac94d05492cfd88c95 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
|
---
layout: post
title: "Obvious Javascript 'Injection' Fallback"
date: 2020-12-04
---
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 *empty* HTML elements with the assumption they will be filled via Javascript.
## Our Hypothetical Project
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:
### HTML
Here we create an empty `h2` tag that will update with the current number of users via js:
<main>
<h2 class="total-tally"></h2>
</main>
### Javascript
You'll have to use your imagination here and assume that the `totalTally` variable pulls in the numbers dynamically via API:
var totalTally = "273,677" /* This would pull something dynamically in prod */
document.getElementsByClassName("total-tally")[0].innerHTML=totalTally;
## The Problem
The big issue we have now occurs when a user visits this page without JS enabled. The `h2` 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.
## The (overly simple) Solution
The easiest way to avoid these types of empty tags - add static content. I know - mind blowing, right?
### HTML (updated)
<main>
<h2 class="total-tally">200,000+</h2>
</main>
You might be reading this and saying to yourself, "Wow! Thanks Captain Obvious!" and that's a fair reaction. This is an *obvious* 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.
Rule of thumb: don't make assumption about your users. Play it safe.
|
