A rather geeky/technical weblog, est. 2001, by Bramus
IntersectionObserver
Jonathan Neal dissects the Islands Architecture approach behind Astro. During the presentation, Fred demonstrates dynamically loading JS using “Islands Architecture”,a strategy where small HTML placeholders are progressively upgraded with dynamic or interactive content as-needed. The demonstration involves waiting on the viewport visibility of a div placeholder before loading some JS. Using an IIFE an IntersectionObserver …
Continue reading “Lazy loading JavaScript using IntersectionObserver“
In Table of Contents with IntersectionObserver on CSS-Tricks, Chris Coyier talks about sticky table of contents on long pages whose active state updates as you scroll. When talking about those, you can not not mention the wonderful Progress Nav by Hakim El Hattab. Final version of the progress nav! Switched to SVG and made it …
Sam Thorogood has been looking into all kinds of changes that can happen to DOM Nodes: This post will explain how to be notified when: an element is added or removed from the DOM the bounding box of an element changes (i.e., resizes) an element moves around the page for any reason Expect some ResizeObserver, …
content-visiblity: auto; vs. jumpy scrollbars, a solution
As warned in content-visibility: the new CSS property that boosts your rendering performance you need to be careful with applying content-visibility: auto; on each and every element as the scrollbar might get jumpy. This is because elements will be rendered as they scroll into the viewport and will be hidden as they scroll out of …
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The react-intersection-observer package is an easy way to work with the Intersection Observer API in React. It comes with both a Hooks, render props and plain children implementation. import React from 'react' import { useInView } from 'react-intersection-observer' const Component = () => { const [ref, inView, entry] = useInView({ /* Optional options */ threshold: …
Continue reading “useInView – A React Hook to work with IntersectionObserver”
Yesterday evening I was working on a documentation page. The page layout is quite classic, as it consists of a content pane on the left and a sidebar navigation on the right. Looking for a way to make the page less dull I decided to add a few small things to it: Smooth Scrolling when …
Continue reading “Smooth Scrolling Sticky ScrollSpy Navigation”
Jonathan Davis – Web Technologies Evangelist for Apple – has done a writeup on the new features that have landed in Safari 12.1, which is included with macOS Mojave 10.14.4 and iOS 12.2. This release delivers web platform features that improve website integration with the operating system, new real-time communication capabilities, more compatible encrypted media …
quicklink – Prefetch links (during idle time) based on what is in the user’s viewport
Great little piece of JavaScript which prefetches links, but only when the browser is idle (and when the user is on a “fast” connection). Uses the aforementioned Intersection Observer to detect which links are in-view. Install it per NPM and call its quicklink(); method – for example after the DOM has loaded – to initialize …
position: sticky;Sticky Events is a library that can listen for events on elements that have position: sticky; applied. It’s an abstraction built on top of the IntersectionObserver, and provides one with three types of events: StickyEvent.CHANGE: Fired when an element becomes stuck or unstuck StickyEvent.STUCK: Fired only when an element becomes stuck StickyEvent.UNSTUCK: Fired only when …
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Very in-depth article on Evil Martians’ team blog on scrolling: We have scrolled to the bottom of modern web specifications to take you on a whirlwind tour of latest CSS and JavaScript features that make navigating around a single page smooth, beautiful and less resource-hungry. Subjects tackled are styling of scrollbars, position: sticky, IntersectionObserver, Smooth …