Now, how can we code to connect the scroll events to the boolean value of the show state? We need the window object. When we programatically change show back into true, then the show prop, instead of hide, will be given to Header so that the top app bar will reappear by sliding up. When we programatically change show into false, then the hide prop, instead of show, will be given to Header so that the top app bar will disappear by sliding up. So the Header component receives the show prop to show the top app bar at the top of the screen. To start with, create the TopAppBar component out of the Header styled component:īy default, the show state is true. ![]() We now want to apply hide prop to Header component when the user scrolls down and apply show prop when the user scrolls up. An element that reappears should reappear quick. We don't care about what is going out, but we do care about what is coming in. reappearing with scrolling up) should be faster than that of sliding up to disappear. In my view the speed of sliding down (i.e. So here I set 0.5 second for sliding up and 0.25 second for sliding down (for simplicity). But I haven't figure out how (that'll be worth another article). Ideally, the animation speed should sync with the speed of scrolling. To show the app bar, translate it back to its original position with transform:translate(0,0). So define it as topAppBarHeight and refer to it both in the transform property and height property. The height value is therefore needed to explicitly set. To hide the app bar, we need to move it upwards by its height. I call it Header with semantic HTML tag Įnter fullscreen mode Exit fullscreen mode ![]() In addition, I wanted to use my favorite Styled Components to apply CSS.įirst, create a Styled Component with CSS transitions to apply. So I needed to update his/her snippet into the one with React Hooks. ![]() The starting point was a StackOverflow answer by user8808265 (2018), but his/her snippet uses React's now-outdated class components. Today I've managed to scratch-build Material Design's top app bar, in particular its behaviour of sliding up/down if the user scrolls down/up, without relying on libraries like Material Components Web or Material-UI. To publish the core idea sooner rather than never, I ask you to bear with my imperfect writing below. But I tend to keep such "beta version" articles in my MacBook forever. 16 Glassmorphism for Firefox 17 Responsive images: DIY implementation in 6 stepsĭisclaimer: This article is currently a "beta version" ( 1.0.0-beta.6), by which I mean the quality of exposition doesn't meet my own expectation yet. Do nest the hamburger menu button inside. 3 React Hooks to scroll-animate a top app bar in Material Design style 4 Definitive edition of "How to Favicon" in 2023 5 Loading Google Fonts and any other web fonts as fast as possible in early 2021 6 Which fallback fonts should we choose to make FOUT less jarring 7 4 gotchas when setting up Google Maps API with Next.js and ESLint 8 How to handle invalid user inputs in React forms for UX design best practices 9 JSON web tokens are NOT meant for authenticating the same user repeatedly: Use session tokens instead 10 Everything about ``: when to use it and how to style it in small caps 11 Everything about ``: When to use it and how to style it 12 Choosing semantic HTML mark-up for italic text, guided by Chicago Manual of Style 13 Making embedded YouTube videos (1) responsive, (2) accessible, and (3) less YouTube-looking 14 Mastering the art of `alt` text for images 15 Don't nest inside. 1 Beyond create-react-app: Why you might want to use Next.js or Gatsby instead 2 How to use HTML Canvas with React Hooks.
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