We resize these boxes to fit our desired design by increasing or decreasing the height and width. What is overflow in CSS?īefore we look at what the CSS overflow property is, we first need to understand that everything in CSS is a box. In this article, we will delve into CSS overflow scroll, exploring the root causes of the issue and suggesting ways to effectively solve it. This issue is known as the scrolling overflow problem in CSS. Have you ever encountered a horizontal scroll bar on your screen because your web content didn’t fit? Or opened a modal to find the rest of the page (i.e., the background content) still scrolling? Have you tested your site with a different browser, and found that the page scrolls horizontally?Ĭhances are, you have. We will use it to pass an array of custom dependencies into our hook, forcing it to re-render on their state change and preventing any unnecessary renders.Editor’s note: This article was last updated on 8 November 2023 to include advanced techniques to control overflow by using the overflow: clip and overflow-clip-margin properties. If you take a look at the hook's function you'll notice the deps parameter. Your code runs immediately after the DOM has been updated, but before the browser has had a chance to "paint" those changes (the user doesn't actually see the updates until after the browser has repainted). This can be useful if you need to make DOM measurements (like getting the scroll position or other styles for an element) and then make DOM mutations or trigger a synchronous re-render by updating the state.Īs far as scheduling, this works the same way as componentDidMount and componentDidUpdate. In our case, the best choice would be useLayoutEffect, it runs synchronously immediately after React has performed all DOM mutations. React currently supports two types of Effect hooks: useEffect and useLayoutEffect. By default, effects run after every completed render, but you can choose to fire it only when certain values have changed. This is exactly what we need, a stateful value that won't trigger re-render on each state change.īecause our hook is tightly bound to DOM we need to implement it inside an Effect hook. It’s handy for keeping any mutable value around similar to how you’d use instance fields in classes. According to React-Hooks reference guide, useRef() is useful for more than the ref attribute. Note, that I'm using the useRef() and not useState(). The final version of the hook will look something like this: Read the docs and see the sample code given to you by the npm package you mentioned :e react-horizontal-scrolling-menu. Overflow scroll in React Ask Question Asked 5 years, 2 months ago Modified 5 years, 2 months ago Viewed 1k times 0 This is really weird issue. In this article, I'll try to solve the aforementioned issues by implementing a useScrollPosition React hook with performance in mind! You havent even tried to implement a slider in that given code snippet or sandbox. In React context it can lead to a lot of unnecessary re-renders, and as a side effect, have a significant hit on the overall app performance! Dynamic popups and user messages that become visible at a certain point during the page scroll.įirst of all, I've to notice that most of the time scroll listeners do very expensive work, such as querying DOM elements, reading height/width and so on.Sticky elements that remain at the same exact position on scroll change.Dynamic navigation bars that hide/show during scroll.Tracking viewport/element scroll position could be vastly useful and for the most part, the only way to enrich your web project with cool dynamic features, like: Today we are going to learn, how to use JavaScript scroll event listener to track browser scroll position using hooks - React not so old new feature.
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