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[[!meta title="Bidirectional Scrolling: Why Not Both?"]]
[[!meta date="2020-11-09"]]
*I recently came across Adam Silver's post [about the merits and pitfalls of bidirectional scrolling](https://adamsilver.io/articles/bidirectional-scrolling-whats-not-to-like/)* and found myself conflicted with the design arguments put forth in the article. It's a very good article overall, and I suggest giving it a read before digging deeper into my post here.
## The Premise
The original article argues that displaying page content via horizontal scrolling (and therefore slightly hiding interactive content) creates a few major issues:
- it increases the chance users won't see it
- there's a greater reliance on digital literacy
- it's generally more labour intensive for users
Adam also makes a solid statement here:
> Having to scroll down and across in a zig zag fashion can be tiresome, especially for people with motor impairments.
But I don't believe these issues create a need to completely remove the horizontal "scrolling" design altogether. You can still implement the `See All Items` category link, while allowing the horizontal content to load in *dynamically*. Balance is always key.
## Not All At Once, Please!
So what exactly do I mean by *dynamically* loading in horizontal content?
- The user is shown the top 4 items in a given category
- From there, the user can use the `See All Items` link to jump into a full category page
- If they so desire, they can begin scroll horizontally in a given category row
- Once they reach the end of the row, 4 more items will load in automatically to expand the list
- To avoid a never-ending list, it might be best to limit total row items to ~20 items. At this point the UI could prompt the user to `View All Items` in that category.
By loading the row content in piece-by-piece, initial loads for users will be faster and subsequent list items will load quickly as well (since they would limit to a set default - in this case only 4).
## Final Improvements
Below you can find a quick, static version of this concept. Here you can see the horizontal list items, along with their corresponding `See All Items` links. You'll have to use your imagination for how new items would load once you each the end of a horizontal row. (I'm too lazy to spend extra time building out that functionality for a hypothetical blog post)
[Live CodePen Example](https://codepen.io/bradleytaunt/pen/pobxpXz)
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