Tobias Ahlin / Blog

@tobiasahlin

Moving along a curved path in CSS with layered animation

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CSS animations and transitions are great for animating something from point A to B. That is, if you want to animate along a straight path. No matter how much you bend your bezier curves, you can’t make something move along a curved path by applying an animation or a transition to an object. You can overshoot with custom timing functions, and produce spring-like effects, but the relative movement along the X and Y-axis will always be identical.

Instead of turning to JavaScript for producing more natural-looking motion, there’s an easy way to work around this limitation: layered animation. By using two or more objects to drive an animation, we get fine-grained control over an object’s path, and can apply one timing function for the movement along the X-axis, and another one for the Y-axis.

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How to animate "box-shadow" with silky smooth performance

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How do you animate the box-shadow property in CSS without causing re-paints on every frame, and heavily impacting the performance of your page? Short answer: you don’t. Animating a change of box-shadow will hurt performance.

There’s an easy way of mimicking the same effect, however, with minimal re-paints, that should let your animations run at a solid 60 FPS: animate the opacity of a pseudo-element.

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Animating Link Underlines

I recently added a simple visual effect to this blog that I quickly fell in love with: when you hover blog headers, the link’s underline is revealed by animating it out from the center. You can try it in the banner above.

Creating this effect is surprisingly easy, doesn’t require any additional DOM elements to be added through HTML, and falls back nicely for browsers that don’t support CSS animations (it will just show up as a regular underline).

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Infinite Scroll With Jekyll

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If you want to use Jekyll but don’t want to settle with a list of links to your blog posts, I just open sourced the parts that drives this blog’s infinite scroll. As I mentioned in Moving from WordPress to Jekyll, the implementation is built around collecting the links to all blog posts in a JSON file, and using that to load more posts as you scroll.

If you’d like to add this juicy feature to your Jekyll site, head over to GitHub and grab the source, and let’s get started.

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Chaining in jQuery

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Chaining in jQuery let’s you write code that is faster to execute, easier to read, and easier to maintain. Even if you haven’t heard of chaining, if you’ve worked with jQuery it’s likely that you’ve already seen jQuery code utilizing chaining.

So what does it look like? Let’s compare two snippets of code—they accomplish the exact same thing, but one uses chaining, and the other one doesn’t:

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